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Электронный компонент: FM1246

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DATA SHEET
Preliminary specification
File under Tuners, DC03
1997 May 14
TUNERS
FM1246
Desktop video & FM radio module
system CCIR I
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1997 May 14
2
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
FEATURES
System I and FM radio broadcast
True 5 V device (low power dissipation)
Full TV frequency range from channel A (45.75 MHz) to
channel 69 (855.25 MHz)
FM radio band coverage from 87.50 to 108.00 MHz
PLL controlled tuning
Programmable PLL step size (31.25, 50 or 62.5 kHz)
True-synchronous vision IF demodulator (PLL)
Ultra-linear FM PLL demodulator for FM radio broadcast
Demodulated video output, AF sound output, second
sound IF output
I
2
C-bus control of tuning, address selection, AFC status
information
Complies with European regulations on radiation, signal
handling and immunity
"CENELEC 55020, 55013''
Small horizontally mounted metal housing.
DESCRIPTION
The FM1246 front-end is designed to receive both TV and
FM stereo signals in the PC Multimedia environment. The
units are available with separate 75
inputs for TV and
FM broadcast reception. The input connectors available
are either standard phono or IEC type (female for TV, male
for FM radio). The tuning, bandswitching and antenna
selection are made through the I
2
C-bus.
The front-end covers the TV bands from 45.75 MHz to
855.25 MHz. The FM band covers the standard
87.50 MHz to 108.00 MHz. An RDS decoder can be
connected to the AF-MPX output. The FM1246 meets the
input immunity and radiation requirements of CENELEC.
The FM1246 consists of a TV tuner, an FM radio tuner and
an IF section, all on a single PCB. The front-end is
assembled in a metal housing made of a rectangular
tin-plated steel frame, with front and rear covers, which
have soldered contacts to the frame. The two phono or
IEC antenna connectors (female for TV, male for FM
radio) are mounted on one side of the frame for the TV/FM
signal inputs. All other connections are made via pins at
the bottom.
The TV IF section uses an intercarrier SAW filter, followed
by a true-synchronous vision IF demodulator (PLL) IC. The
analog AFC voltage is fed to the 5-level A/D converter in
the PLL tuning IC, so that the AFC status can be read via
the I
2
C-bus.
In the FM radio mode, the level detector and AFT functions
are provide for the auto-search routines. The level detector
and AFT status can be read from the A/D bits in the
status-byte. The mute function is also provided to
suppress the audio output signal, if required.
The tuner AGC for both TV and FM radio operation, is
generated with a novel AGC detector which measures the
IF signal level directly at the tuner IF output pins. As
opposed to the conventional AGC detector, this new circuit
allows a higher take-over level and offers superior
immunity against tuner overload.
The demodulation of the TV sound and FM radio IF
(10.70 MHz) is done with a PLL demodulation circuit
contained in the IF IC. In the FM radio mode, the
multiplexed AF signal is then channelled to a stereo
decoder IC which extracts the left/right analog signals.
The multiplexed audio signal is also available at pin 25 to
support RDS implementations. The 2
nd
IF TV sound output
is provided to connect external (analog 2 carrier or digital)
stereo processing.
ORDERING INFORMATION
MARKING
The following items of information are printed on a sticker
that is on the top cover of the tuner:
Type number
Code number
Origin letter of factory
Change code
Year and week code.
TYPE
DESCRIPTION
CATALOGUE
NUMBERS
FM1246/HM/PH
standard phono
3139 147 13901
FM1246/HM/I
IEC connector
3139 147 13911
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1997 May 14
3
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
INTERMEDIATE FREQUENCIES
SYSTEM
FREQUENCY
(MHz)
Picture carrier
38.90
Colour
34.47
Sound
32.90
NICAM
32.348
FM
10.70
CHANNEL COVERAGE
BAND
FREQUENCY
(MHz)
FM radio band
87.50 to 108.00
Low band
45.75 to 170.00
Mid band
170.00 to 450.00
High band
450.00 to 855.25
PINNING
SYMBOL
PIN
DESCRIPTION
V
T
11
tuning voltage (monitor)
V
S(tuner)
12
supply voltage tuner section +5 V
SCL
13
I
2
C-bus serial clock
SDA
14
I
2
C-bus serial data
AS
15
I
2
C-bus address select
AF O/P right
20
FM radio right channel
AF O/P left
21
FM radio left channel
2
nd
IF O/P
22
second IF TV sound output
CVBS
23
Composite Video Baseband Signal (CVBS) output
V
S(IF)
24
supply voltage IF section +5 V
AF O/P
25
AF sound output
-
TH1, TH2, TH3 and TH4
mounting tags (ground)
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1997 May 14
4
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
BLOCK DIAGRAM
handbook, full pagewidth
LOW BAND
HIGH BAND
TV
antenna
MID BAND
CCA505
HIGH
OSC.
MID
OSC.
LOW
OSC.
11
12
13
14
15
20
21
22
25
24
PLL
STEREO
DECODER
DC-DC
MIXER - OSCILLATOR IC
VIF
PLL
DEMODULATOR
FM
DEMODULATOR
SAW
VT
AS
VCO
DISCRIMINATOR
10.7 MHz
TRAP
FILTER
10.7 MHz
FILTER
FM-IF
10.7 MHz
FILTER
AGC
DETECTOR
V
IF
IF
SDA
SCL
VT
monitor
AFT
2nd IF
sound
output
2nd IF
AF
(TV)
+
5 V
V
S(IF)
+
5 V
V
S(
tuner)
AF-R
AF-L
FM
antenna
23
CVBS
Fig.1 Electrical block diagram.
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1997 May 14
5
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
LIMITING VALUES
Limiting values under operational conditions
The tuner can be guaranteed to function properly under the following conditions.
Notes
1. Sinusoidal ripple voltage superimposed on the 5 V supply voltage in the frequency range of 20 Hz to 500 kHz.
Criteria for TV interference >57 dB.
2. For detailed information about the address decoding, refer to Chapter "Application information".
SYMBOL
PARAMETER
PIN
MIN.
TYP.
MAX.
UNIT
V
S
supply voltage
12
4.75
5.00
5.25
V
V
S(ripple)
peak-to-peak ripple voltage susceptibility
(at 5 V
5%); note 1
20 Hz to 100 kHz
-
-
5
mV
>100 kHz to 500 kHz
-
-
10
mV
I
S(tuner)
supply current
-
-
120
mA
V
SCL
SCL bus input voltage
13
-
0.3
-
+5.25
V
V
SDA
SDA bus input voltage
14
-
0.3
-
+5.25
V
I
SDA
SDA bus current (open collector)
-
1
-
+5
mA
V
AS
address select voltage; note 2
15
-
-
+5.25
V
V
AFright(FM)
FM right channel DC voltage
20
-
1.0
-
V
Z
AFright(FM)
FM right channel load impedance parallel connected:
resistive value
-
50
-
k
capacitive value
-
9
-
pF
V
AFleft(FM)
FM left channel DC voltage
21
-
1.0
-
V
Z
AFleft(FM)
FM left channel load impedance:
resistive value
-
50
-
k
capacitive value
-
9
-
pF
Z
IF
2
nd
IF sound output load impedance
22
0.5
-
-
k
Z
CVBS
Composite Video Baseband Signal load impedance
23
-
75
-
t
L
CVBS load time constant
-
-
100
ns
V
S(IF)
IF supply voltage
24
4.75
5.0
5.25
V
I
S(IF)
IF supply current
-
-
150
mA
Z
AF
AF sound output load impedance parallel connected:
25
resistive value
5.0
-
-
k
capacitive value
-
-
4
nF
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1997 May 14
6
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Environmental conditions
OVERALL PERFORMANCE
Conditional data
Unless otherwise specified, all electrical values for Chapter "Overall performance" apply at the following conditions.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Non-operational conditions
T
amb
ambient temperature
-
25
-
+85
C
RH
relative humidity
-
-
100
%
g
B
bump acceleration
25 g
-
-
245
m/s
2
g
S
shock acceleration
50 g
-
-
490
m/s
2
vibration amplitude
10 to 55 Hz
-
0.35
-
mm
Operational conditions
T
amb
ambient temperature
-
10
-
+60
C
RH
relative humidity
-
-
95
%
SYMBOL
PARAMETER
VALUE
UNIT
T
amb
ambient temperature
25
5
C
RH
relative humidity
60
15
%
V
S
supply voltage (tuner and IF section)
5
0.125
V
Z
CVBS
video output load impedance (DC)
75
Z
IF
2
nd
IF sound output load impedance (DC)
0.5
k
Z
AF
AF sound output load impedance
100
k
t
pr
pre-heating time (+5 V at pin 24)
10
minutes
Z
S(AE)
aerial source impedance (asymmetrical)
75
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1997 May 14
7
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
TUNER CHARACTERISTICS
For detailed information about the PLL programming, refer to Chapter "Application information".
The desktop video tuner is guaranteed to function properly within the specified operational conditions, but a certain
deterioration of performance parameters may occur at the limits of the operational conditions.
Required data for test equipment to be used
EQUIPMENT
PARAMETER
VALUE
UNIT
DC voltmeter
input impedance
>1
M
Oscilloscope
input impedance:
resistance
>1
M
capacitance
<15
pF
Spectrum analyzer
input impedance
50
FET probe
input impedance:
resistance
1
M
capacitance
3.5
pF
output impedance
50
voltage gain
0
dB
AC millivoltmeter
input impedance
>100
k
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1997 May 14
8
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
handbook, full pagewidth
IF
PROBE
OUT
IF
output
12 13 14 15
TP2
TP3
21
20
10
9
22 23 24 25
aerial
connector
VT
VS
SCL
SDA
BU2
10
nF
33
F
1
nF
10
nF
BU6
BU2
BU4
BU5
BU8
BU7
+
5 V
DA
DA
SA
TEST JIG
(1)
(2)
video
out
P
5
k
3
k
CCA650
11
5
6
3
8
4
1
7
2
220
nF
22
220
k
47
F
1
F
47
k
47
k
47
F
47
F
39
k
+
+
-
220
nF
39
k
22
22
240
k
240
k
+
+
-
5 V
220
k
1
/
2
TDA1308
1
/
2
TDA1308
S1
15 kHz
LOW-PASS
FILTER
+
+
Fig.2 Typical test set up.
(1) BU4 loaded with 75
.
(2) 50
s de-emphasis.
SA = Spectrum Analyzer.
P = FET probe.
DA = Distortion Analyzer.
VAC = dual channel AC voltmeter (Z
i
= 600
).
The minimum load impedance required at the CVBS output (pin 23) is 75
(both AC and DC).
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1997 May 14
9
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Definitions of test signals (see Fig.2)
Aerial input characteristics
TEST SIGNAL
FREQ.
(MHz)
AMPLITUDE
MODULATION
VIDEO
AUDIO
A0: unmodulated vision
carrier
480.25
60 dB
V
A1: CCIR I standard signal
with video modulation
480.25
60 dB
V
(top sync)
100% (rest carrier 10%)
2T pulse and bar
B1: unmodulated sound
carrier I system
486.25
-
7 dB w.r.t. A1
B2: FM modulated sound
carrier I system
486.25
-
7 dB w.r.t. A1
1 kHz; modulation frequency
deviation
27 kHz;
50
s pre-emphasis
B3: unmodulated sound
carrier I system
478.25
-
15 dB w.r.t. A1
C1: FM modulated sound
carrier
87.5
60 dB
V
1 kHz; modulation frequency
deviation
75 kHz;
10% pilot carrier (L = R)
C2: FM modulated sound
carrier
98.0
60 dB
V
1 kHz; modulation frequency
deviation
75 kHz;
10% pilot carrier (L = R)
C3: FM modulated sound
carrier
108.0
60 dB
V
1 kHz; modulation frequency
deviation
75 kHz;
10% pilot carrier (L = R)
C4: FM modulated sound
carrier
98.0
60 dB
V
1 kHz; modulation frequency
deviation
22.5 kHz
C5: unmodulated sound
carrier
98.0
60 to 100 dB
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
VSWR
reflection coefficient
referred to 75
impedance
(worst case on or between picture
and sound carrier at maximum gain):
all channels in TV mode
-
5
FM (centre of channel)
-
4
V
PSM
surge protection voltage
5
-
kV
V
ant
antenna connection disturbance
voltage
<1.75 GHz
-
46
dB
V
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1997 May 14
10
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
General characteristics
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
f
b
frequency range:
FM band
87.50
-
108.00
MHz
low band
45.75
-
168.25
MHz
mid band
175.25
-
447.25
MHz
high band
455.25
-
855.25
MHz
f
b
margin:
for FM band
3
-
-
MHz
for low band
1.5
-
-
MHz
for mid/high band
3
-
-
MHz
i
image rejection (nominal gain to
10 dB gain reduction):
low band
68
-
-
dB
mid band
<300 MHz
66
-
-
dB
mid band
>300 MHz
60
-
-
dB
high band (channel 14 to 69)
50
-
-
dB
IF
IF rejection (picture)
60
-
-
dB
Z
IF
1
/
2
IF susceptibility:
low, mid band
75
-
-
dB
V
high band
60
-
-
dB
V
m
x
cross modulation:
in-channel
65
-
-
dB
V
in-band
low band (n
2)
78
-
-
dB
V
mid band (n
3)
78
-
-
dB
V
high band (n
5)
84
-
-
dB
V
out of band
-
100
-
dB
V
breakthrough susceptibility:
channel A to 69
60
-
-
dB
V
V
osc
oscillator voltage at all pins
-
-
70
dB
V
t
li
oscillators lock-in time
charge pump set logic HIGH
-
-
150
ms
vs
the video signal-to-sound
interference ratio with the tuner
exposed to sound signals in the
audio frequency range
100 Hz to 10 kHz and sound
pressure levels up to 105 dB
(20
Pa)
40
-
-
dB
audio S/N ratio
40
-
-
dB
V
ESD
electrostatic discharge (ESD)
on all pins
note 1
2
-
-
kV
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1997 May 14
11
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Note
1. All the pins of the desktop video tuner are protected against electrostatic discharge (ESD) up to 2 kV. The product is
classified in category B
(``MIL-STD-883C").
FM radio characteristics
26
limiting sensitivity for (S+N)/N
test signal C1
-
7
30
dB
V
50
test signal C3
-
30
40
dB
V
S/N ratio:
test signal C1
mono at f = 22.5 kHz
55
58
-
dB
mono at f = 75 kHz
65
68
-
dB
stereo
test signal C3
55
63
-
dB
i(FM)
FM image rejection
test signal C1
53
65
-
dB
effective selectivity S
300
test signal C1 + C2
50
-
-
dB
frequency response:
test signal C3;
-
3 dB points
lower
-
3 dB point
-
20
40
Hz
upper
-
3 dB point
14
18
-
kHz
AM suppression
test signal C1
38
-
-
dB
FM AF output level at
terminal 20/21 (RMS value):
mono
test signal C1
40
57
74
mV
stereo
test signal C3
120
175
230
mV
stereo separation
test signal C3; 1 kHz
28
35
-
dB
THD
total harmonic distortion:
test signal C3
stereo at 1 kHz
-
0.8
1.5
%
during overmodulation at
f =
100 kHz
-
1.5
3
%
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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1997 May 14
12
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Video and audio characteristics (see Fig.2)
Digital AFC status
ADC word at I
2
C-bus during read operation
PARAMETER
TEST SIGNAL
TEST
POINT
MIN.
TYP.
MAX.
UNIT
CVBS characteristics:
video amplitude signal at pin 23
A1 (peak-to-peak value)
BU4
0.75
0.95
1.15
V
DC level sync pulse at pin 23
A1
BU4
-
0.7
-
V
Video amplitude drop with respect to modulation
1 MHz at T
amb
= 45
C:
at 2 MHz
A1
BU4
-
1.5
-
+
1.5
dB
at 3 MHz
A1
BU4
-
2.5
-
+
1.5
dB
at 4 MHz
A1
BU4
-
4.0
-
+
2.0
dB
at 4.43 MHz
A1
BU4
-
4.0
-
+
2.0
dB
Sound carrier rejection
A1 (1 MHz) + B1
BU4
40
-
-
dB
Residual 40.40 MHz signal in video channel:
level of 1.5 MHz
A1 + B3
BU4
-
-
68
dB
V
Residual 77.8 MHz signal in video channel
A1
BU4
-
-
80
dB
V
Second IF sound output level at level of 6.0 MHz
A1 (black) + B1
BU5
84
-
-
dB
V
Test on 2T pulse at T
amb
= 45
C:
2T pulse/bar response
A1
BU4
-
2.8
-
+
2.8
%
2T pulse response
A1
BU4
-
-
+
3.5
%
CVBS S/N (unweighted)
A1 + B1
BU4
41
-
-
dB
Gain limited sensitivity at 1 dB reduction
of video output
A1
BU4
-
-
30
dB
V
Maximum usable single input signal
A1
BU4
90
-
-
dB
V
Audio characteristics:
AF output level measured via LP 200 kHz filter,
RMS detector, 50
s de-emphasis
A1 + B2
BU6
250
350
450
mV
THD (Total Harmonic Distortion) measured
via LP 200 kHz filter, RMS detector,
50
s de-emphasis
A1 + B2
BU6
-
-
0.5
%
S/N measured via CCIR filter, peak
CCIR detector, 50
s de-emphasis
A1 (full field colour bar)
+ B1
BU6
38
-
-
dB
AM suppression ratio
A1 (black) + B2
BU6
40
-
-
dB
Aerial input level for S/N = 41 dB
A1 (black) + B2
BU6
-
-
45
dB
V
DIGITAL
READ-OUT
FREQUENCY
(kHz)
00
-
125
01
-
62.5
02
0
03
+
62.5
04
+
125
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1997 May 14
13
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
APPLICATION INFORMATION
A detailed description of the I
2
C-bus specification, with applications, is given in brochure
``The I
2
C-bus and how to
use it''. This brochure may be ordered using the code number 9398 393 40011.
WRITE mode
Note
1. A = Acknowledge.
A
DDRESS SELECTION
V
S
= +5 V (PLL supply voltage).
Note
1. If the AS pin is left floating, the internal bias will automatically set the address to C2.
P
ROGRAMMABLE DIVIDER SETTINGS
(
BYTES
1
AND
2)
Divider ratio:
N = 16
{
f
RF(pc)
+ f
IF(pc)
}, where (pc) is picture carrier and f
RF
and f
IF
are expressed in MHz.
f
osc
=
N
/
16
(MHz).
N = (8192
n13) + (4096
n12) + (2048
n11) + (1024
n10) + (512
n9) + (256
n8) + (128
n7) + (64
n6) +
(32
n5) + (16
n4) + (8
n3) + (4
n2) + (2
n1) + n0
For FM radio, f
IF(fm)
= 10.70 MHz
N = (f
RF
+ f
IF(fm)
)/step size = (f
RF
+ f
IF(fm)
)/50 kHz = 20
(f
RF
+ f
IF(fm)
)
BYTE
BITS
7
MSB
6
5
4
3
2
1
0
LSB
A
(1)
Address byte
1
1
0
0
0
MA1
MA0
0
A
Program divider byte 1
0
n14
n13
n12
n11
n10
n9
n8
A
Program divider byte 2
n7
n6
n5
n4
n3
n2
n1
n0
A
Control information byte 1
1
CP
T2
T1
T0
RSA
RSB
OS
A
Control information byte 2
P7
P6
P5
P4
P3
P2
P1
P0
A
MA1
MA0
ADDRESS
VOLTAGE AT PIN 15 (see note 1)
0
0
C0
0.0V
S
to 0.1V
S
0
1
C2
0.2V
S
to 0.3V
S
1
0
C4
0.4V
S
to 0.6V
S
1
1
C6
0.9V
S
to 1.0V
S
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1997 May 14
14
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
C
ONTROL BYTE
Charge pump settings:
CP = 1, for fast tuning
CP = 0, for moderate speed tuning with slightly better residual oscillator FM.
It is recommended to set CP = 1 at all times in the TV mode. In the FM radio mode, set CP = 1 only during the search
tuning. Once the wanted channel is obtained, set CP = 0 to get the best signal-to-noise ratio.
Test mode settings:
T2 = T1 = 0; T0 = 1, for normal operation.
PLL disabling:
OS = 0, for normal operation
OS = 1, for switching the charge pump to the high impedance state. I
DC
output voltage is LOW.
Ratio select bits
P
ORTS BYTE
Notes
1. If the TV function is not required, the tuner can be switched to power-down mode. In this mode the tuner reduces the
current consumption by up to 100 mA.
2. By this setting the FM radio AFC status can be read from the A/D bits in the status byte.
3. By this setting the RF input level can be read from the A/D bits in the status byte.
RSA
RSB
STEP SIZE
X
0
50 kHz (for FM band)
0
1
31.25 kHz (for slow picture search)
1
1
62.5 kHz (for normal picture search)
FUNCTION
BIT
P7
P6
P5
P4
P3
P2
P1
P0
TV/FM bandswitching
FM band
1
0
1
0
1
Low band
1
0
1
0
0
Mid band
1
0
0
1
0
High band
0
0
1
1
0
TV mode
Power down mode; see note 1
0
0
0
1
System I negative mode
0
0
0
0
FM radio mode
AFC; see note 2
0
1
0
1
R
IF
; see note 3
0
1
0
0
Mono
0
1
1
0
Mute
1
1
0
0
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1997 May 14
15
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
T
ELEGRAM EXAMPLES
(WRITE
MODE
)
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Pb - Ack - Stop.
Start - Adb - Ack - Cb - Ack - Pb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Cb - Ack - Stop.
Start - Adb - Ack - Db1 - Ack - Db2 - Ack - Stop.
Where:
Start = start condition
Adb = address byte
Ack = acknowledge
Db1 = divider byte 1
Db2 = divider byte 2
Cb = control byte
Pb = ports byte
Stop = stop condition.
READ mode
The in-lock can be read by setting the R/W bit to 1.
Notes
1. POR = Power On Reset. POR is internally set to 1 in case V
S
drops below 3 V. The POR bit is reset when an end of
data is detected by the PLL IC.
2. FL = In-lock flag; FL = 1: loop is phase-locked. The loop must be phase-locked during at least 8 periods of the internal
reference frequency (either 7.8125 kHz, 3.90625 kHz or 6.25 kHz) before the FL flag is internally set to 1.
3. I2, I1 and I0 = digital information for I/O ports P2, P1 and P0 respectively.
4. A2, A1 and A0 = built-in 5-level A/D converter on the internal I/O port P6 (see Table "Digital AFC status").
5. A = Acknowledge.
T
ELEGRAM EXAMPLES
(READ
MODE
)
Start - Adb - Ack - STB - Ack - STB - - Stop (no Ack from processor = End-of-data).
Start - Adb - Ack - STB - - Stop (no Ack from processor = End-of-data).
Where:
STB = Status byte.
BYTE
BITS
7
MSB
6
5
4
3
2
1
0
LSB
A
(5)
Address byte
1
1
0
0
0
MA1
MA0
1
A
Status byte
POR
(1)
FL
(2)
I2
(3)
I1
(3)
I0
(3)
A2
(4)
A1
(4)
A0
(4)
A
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1997 May 14
16
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Video buffer
A video buffer is built into the video module to enable the
unit to drive a 75
load directly.
I
2
C-bus load
The FM1246 contains a series resistor (R = 100
) in the
SCL and SDA lines. Both lines also have a capacitive load
of typical 22 pF (see Fig.3).
Fig.3 I
2
C-bus load.
handbook, halfpage
CCA507
AS
15
C1
56 pF
R3
R1
R2
100
SCL
13
C3
22 pF
R5
100
SDA
14
C2
22 pF
R4
100
VCC
PLL IC
Fig.4 Typical video signal-to-noise ratio versus RF input level.
handbook, full pagewidth
120
70
10
20
40
60
80
100
CCA651
50
30
video S/N
(dB)
RF input level (dB
V)
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1997 May 14
17
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
MECHANICAL DATA
Fig.5 Mechanical outline FM-versions.
Dimensions in mm.
(1) Standard phono socket female 75
.
(2) Alternative IEC connectors (female for TV/male for FM radio).
handbook, full pagewidth
4.445
21
20
22
23 24 25
0.64
0.64
11
12 13 14 15
89.2
TH4
TH 1
TH3
TH2
(1)
2
2.5
0.5
78.4
7.9
5.1
14.7
4
59.2
13.5 max
2.6
34.7
34.7
29.2
10.85
CCA649
8.1
0.3
8.35
STANDARD PHONO CONNECTOR
(1)
14.4
0.2
11
9.5
IEC CONNECTOR TYPE
(2)
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1997 May 14
18
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
Aerial connections
Standard-phono socket female 75
or IEC (female for TV,
male for FM radio).
Solderability
The solderability of pins and mounting tags when tested
initially and after 16 hours steam ageing in accordance
with
``IEC 68-2-20'', test Ta, method 1 (solder bath
235
5
C for 2
5 s), results in a wetted area of 95%.
No de-wetting will occur when soldered at
260
5
C for 5
0.5 s.
Resistance to soldering heat
The product will not be damaged when tested in
accordance with
``IEC 68-2-20'', test Tb, method 1A
(solder bath 260
5
C for 5
1 s).
Mass
Approximately 50 g.
Robustness of pins
The pins will not be damaged when tested in accordance
with
``IEC 68-2-21'' :
Test Ua1, tensile of 20 N in axial direction
Test Ua2, thrust of 4 N in axial direction
Test Ua2, thrust of 2 N in axial direction.
Punching pattern of chassis PCB
Field rejects are often related to broken tag joints.
Therefore, the following punching pattern is recommended
(see Fig.6).
Fig.6 Punching pattern seen from solder side.
Dimensions in mm.
handbook, full pagewidth
59.2
14.7
4.445
2.1
1.1
34.7
3.5
4.6
2
78.4
0.9
+
0.1
0
unit
contour
CCA509
2.6
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1997 May 14
19
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
TV CHANNEL FREQUENCIES (MHz)
Ireland
Angola
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
A
45.75
51.75
B
53.75
59.75
C
61.75
67.75
D
175.25
181.25
E
183.25
189.25
F
191.25
197.25
G
199.25
205.25
H
207.25
213.25
J
215.25
221.25
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
1
43.25
49.25
2
52.25
58.25
3
60.25
66.25
4
175.25
181.25
5
183.25
189.25
6
191.25
197.25
7
199.25
205.25
8
207.25
213.25
9
215.25
221.25
10
223.25
229.25
South Africa
CHANNEL
PICTURE
CARRIER
FREQUENCY
SOUND
CARRIER
FREQUENCY
4
175.25
181.25
5
183.25
189.25
6
191.25
197.25
7
199.25
205.25
8
207.25
213.25
9
215.25
221.25
10
223.25
229.25
11
231.25
237.25
13
247.43
253.43
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1997 May 14
20
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
DEFINITIONS
LIFE SUPPORT APPLICATIONS
These products are not designed for use in life support appliances, devices, or systems where malfunction of these
products can reasonably be expected to result in personal injury. Philips customers using or selling these products for
use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such
improper use or sale.
PURCHASE OF PHILIPS I
2
C COMPONENTS
Data sheet status
Objective specification
This data sheet contains target or goal specifications for product development.
Preliminary specification
This data sheet contains preliminary data; supplementary data may be published later.
Product specification
This data sheet contains final product specifications.
Application information
Where application information is given, it is advisory and does not form part of the specification.
Purchase of Philips I
2
C components conveys a license under the Philips' I
2
C patent to use the
components in the I
2
C system provided the system conforms to the I
2
C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
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1997 May 14
21
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
background image
1997 May 14
22
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
background image
1997 May 14
23
Philips Components
Preliminary specification
Desktop video & FM radio module
system CCIR I
FM1246
NOTES
background image
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COD11
Philips Electronics N.V. 1997
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