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Электронный компонент: TDA8705AT/C2

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DATA SHEET
Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC02
1996 Jan 12
INTEGRATED CIRCUITS
TDA8705A
6-bit high-speed dual
Analog-to-Digital Converter (ADC)
1996 Jan 12
2
Philips Semiconductors
Product specification
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
TDA8705A
FEATURES
2 times 6-bit resolution
Sampling rate up to 80 MHz
High signal-to-noise ratio over a large analog input
frequency range (5.5 effective bits at 20 MHz full-scale
input at f
clk
= 80 MHz)
TTL output
Two separated inputs (AC-coupling)
TTL compatible digital inputs
Low-level AC clock input signal allowed
Internal reference voltage regulator
(external reference regulation possible)
Power dissipation only 250 mW (typical)
Low analog input capacitance, no buffer amplifier
required
No sample-and-hold circuit required.
APPLICATIONS
High-speed analog-to-digital conversion for:
DBS (Digital Broadcast Satellite)
QPSK (Quadrature Phase Shift Keying) demodulation
Video.
GENERAL DESCRIPTION
The TDA8705A is a 6-bit high-speed dual analog-to-digital
converter (ADC) for satellite video and other applications.
It converts the two analog input signals into two 6-bit
binary-coded digital words at a maximum sampling rate of
80 MHz. All digital inputs and outputs are TTL compatible,
although a low-level sine wave clock input signal is
allowed.
QUICK REFERENCE DATA
Note
1. Full-scale sine wave (f
i
= 20 MHz; f
clk
= 80 MHz).
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
CCA
analog supply voltage
4.75
5.0
5.25
V
V
CCD
digital supply voltage
4.75
5.0
5.25
V
V
CCO
output stages supply voltage
4.75
5.0
5.25
V
I
CCA
analog supply current
20
27
32
mA
I
CCD
digital supply current
10
14
18
mA
I
CCO
output stages supply current
10
14
18
mA
ILE
DC integral linear error
-
0.25
0.5
LSB
DLE
DC differential linearity error
-
0.25
0.5
LSB
AILE
AC integral linearity error
note 1
-
0.5
1.0
LSB
f
clk(max)
maximum clock frequency
80
-
-
MHz
P
tot
total power dissipation
-
250
-
mW
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8705AT
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
1996
Jan
12
3
Philips Semiconductors
Product specification
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
TDA8705A
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BLOCK DIAGRAM
handbook, full pagewidth
7
AGND
10
DEC
VRTA
VCCA
VCCD
VCCO
17
18
19
16 D1B
D2B
D3B
D4B
15
20
D0B
D5B
TTL OUTPUTS
LATCHES
ANALOG -TO-DIGITAL
CONVERTER
B
MLC374
TDA8705A
analog ground
data
outputs
LSB
MSB
6
25
26
27
24 D1A
D2A
D3A
D4A
23
28
D0A
D5A
TTL OUTPUTS
LATCHES
ANALOG -TO-DIGITAL
CONVERTER
A
data
outputs
LSB
MSB
6
9
5
12
14
REGULATOR
CLOCK DRIVER
VRBA
VRMA
VRTB
VRMB
4
VIA
RINTA
RINTB
6
VRBB
13
VIB
11
8
2
21
3
DGND
1
CLK
digital ground
22
OGND
output ground
reference
voltage TOP
A
reference
voltage TOP
B
analog
voltage input
A
reference
voltage BOTTOM
A
analog
voltage input
B
reference
voltage BOTTOM
B
reference
voltage MIDDLE
A
reference
voltage MIDDLE
B
Fig.1 Block diagram.
1996 Jan 12
4
Philips Semiconductors
Product specification
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
TDA8705A
PINNING
SYMBOL
PIN
DESCRIPTION
CLK
1
clock input
V
CCD
2
digital supply voltage (+5 V)
DGND
3
digital ground
V
RBA
4
reference voltage BOTTOM for
ADC A (decoupling)
V
RTA
5
reference voltage TOP for ADC A
(decoupling)
V
IA
6
analog input voltage for ADC A
AGND
7
analog ground
V
CCA
8
analog supply voltage (+5 V)
V
RMA
9
reference voltage MIDDLE for ADC A
(decoupling)
DEC
10
decoupling input
V
IB
11
analog input voltage for ADC B
V
RTB
12
reference voltage TOP for ADC B
(decoupling)
V
RBB
13
reference voltage BOTTOM for
ADC B (decoupling)
V
RMB
14
reference voltage MIDDLE for ADC B
(decoupling)
D0B
15
data output; bit 0 (LSB), ADC B
D1B
16
data output; bit 1, ADC B
D2B
17
data output; bit 2, ADC B
D3B
18
data output; bit 3, ADC B
D4B
19
data output; bit 4, ADC B
D5B
20
data output; bit 5 (MSB), ADC B
V
CCO
21
supply voltage for output stages
(+5 V)
OGND
22
output ground
D0A
23
data output; bit 0 (LSB), ADC A
D1A
24
data output; bit 1, ADC A
D2A
25
data output; bit 2, ADC A
D3A
26
data output; bit 3, ADC A
D4A
27
data output; bit 4, ADC A
D5A
28
data output; bit 5 (MSB), ADC A
Fig.2 Pin configuration.
handbook, halfpage
1
2
3
4
5
6
7
8
9
10
11
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
TDA8705A
CLK
DGND
V IA
V CCD
V RBA
V RTA
V RMA
V IB
V RTB
V RBB
V RMB
VCCA
AGND
DEC
D5B
D4B
D3B
D2B
D1B
D0B
D3A
D2A
D1A
D0A
V CCO
OGND
D5A
D4A
MLC375
1996 Jan 12
5
Philips Semiconductors
Product specification
6-bit high-speed dual Analog-to-Digital
Converter (ADC)
TDA8705A
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
Note
1. The supply voltages V
CCA
, V
CCO
and V
CCD
may have any value between
-
0.3 V and +7 V provided the difference
between V
CCA
, V
CCO
and V
CCD
is between
-
1 V and +1 V.
HANDLING
Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling integrated circuits.
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
CCA
analog supply voltage
note 1
-
0.3
+7.0
V
V
CCD
digital supply voltage
note 1
-
0.3
+7.0
V
V
CCO
output stages supply voltage
note 1
-
0.3
+7.0
V
V
CC
supply voltage differences between V
CCA
and V
CCD
-
1.0
+1.0
V
V
CC
supply voltage differences between V
CCO
and V
CCD
-
1.0
+1.0
V
V
CC
supply voltage differences between V
CCA
and V
CCO
-
1.0
+1.0
V
V
I
input voltage
referenced to AGND
-
0.3
+7.0
V
V
clk(p-p)
AC input voltage for switching
(peak-to-peak value)
referenced to DGND
-
V
CCD
V
I
O
output current
-
10
mA
T
stg
storage temperature
-
55
+150
C
T
amb
operating ambient temperature
0
+70
C
T
j
junction temperature
-
+150
C
SYMBOL
PARAMETER
VALUE
UNIT
R
th j-a
thermal resistance from junction to ambient in free air
70
K/W