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Электронный компонент: TDA8780M

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DATA SHEET
Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC03
1995 Jul 25
INTEGRATED CIRCUITS
TDA8780M
True logarithmic amplifier
1995 Jul 25
2
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
FEATURES
72 dB true logarithmic dynamic range
Small-signal gain-adjustment facility
Constant limiting output voltage
Temperature and DC power supply voltage independent
Easy interfacing to analog-to-digital converters
Output DC level shift facility.
APPLICATIONS
Dynamic range compression
IF signal dynamic range reduction in digital receivers
Compression receivers.
GENERAL DESCRIPTION
The TDA8780M is a true logarithmic amplifier intended for
dynamic range reduction of IF signals at 10.7 MHz in
digital radio receivers. It offers true logarithmic
characteristics over a 72 dB input dynamic range, has a
small-signal gain-adjustment facility and a constant
limiting output voltage for large input levels.
A unique feature is the smooth "changeover" from linear
operation (inputs less than 60
V) to logarithmic mode.
The device is manufactured in an advanced BiCMOS
process which enables high performance being obtained
with low DC power supply consumption. The true
logarithmic amplifier can be driven by single-ended or
differential inputs. The DC operating point is set by overall
on-chip feedback decoupled by two off-chip capacitors,
which define the low-frequency cut-off point.
The performance of the amplifier is stabilized against
temperature and DC power supply variations. The
differential output is converted internally to a single-ended
output by an on-chip operational amplifier arrangement in
which the DC output level is set by an externally-supplied
reference voltage. A power-down facility allows the circuit
to be disabled from a control input.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage
4.5
5.0
5.5
V
I
P
supply current
-
-
6.7
mA
I
P(PD)
supply current in power-down mode
-
-
250
A
f
in
operating input frequency
-
-
15
MHz
V
in(M)
dynamic logarithmic input voltage (peak value)
0.06
-
300
mV
T
amb
operating ambient temperature
-
20
-
+75
C
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8780M
SSOP20
plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
1995 Jul 25
3
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
BLOCK DIAGRAM
Fig.1 Block diagram.
dbook, full pagewidth
MBE161
100 k
100 k
100 k
100 k
20 k
20 k
20 k
20 k
13
8
17
6
1
20
15
11
VP
16
3
18
CONTROL
4
5
19
14
10
7
2
GND1 GND2 GND3 GND4 GND5
TDA8780M
Vin
Vin
Vref
C DEC1
C DEC2
R g
R g
C lf
C lf
CE
TEST
Vout
1995 Jul 25
4
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
PINNING
SYMBOL
PIN
DESCRIPTION
V
in
1
signal voltage input
GND1
2
ground 1
C
DEC1
3
control circuit first decoupling and
optional start-up capacitor connection
R
g
4
small-signal gain-setting resistor
R
g
5
small-signal complementary
gain-setting resistor
C
lf
6
low-frequency cut-off point setting
capacitor
GND2
7
ground 2
V
ref
8
external reference voltage input
n.c.
9
not connected
GND3
10
ground 3 (main ground)
V
P
11
power supply
n.c.
12
not connected
V
out
13
true logarithmic voltage output
GND4
14
ground 4
C
lf
15
complementary low-frequency cut-off
point setting capacitor
CE
16
TTL-level-compatible circuit enable
input (active HIGH)
TEST
17
test input; connected to ground in
normal operation
C
DEC2
18
control circuit second decoupling and
optional start-up capacitor
GND5
19
ground 5
V
in
20
complementary signal voltage input
Fig.2 Pin configuration.
handbook, halfpage
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
Vin
Vin
GND1
GND2
GND3
GND5
GND4
Vref
C DEC1
C DEC2
R g
R g
C lf
C lf
n.c.
n.c.
CE
TEST
Vout
VP
TDA8780M
MBE160
1995 Jul 25
5
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
FUNCTIONAL DESCRIPTION
A true logarithmic amplifier can be realized from a cascade
of similar stages each stage consisting of a pair of
amplifiers whose inputs and outputs are connected in
parallel. One of these amplifiers can be formed by an
undegenerated long-tailed pair which provides high gain
but limited linear input signal-handling capability. The
other amplifier can be formed by a degenerated long-tailed
pair which provides a gain of unity and a much larger linear
input signal-handling capability.
The overall cascade amplifies very small input signals but,
once these reach the level at which the undegenerated
long-tailed pair in the last stage is at the limit of its linear
signal-handling capability, the output voltage becomes
logarithmically dependent on the input signal level. This
behaviour continues until the input signal reaches the level
at which undegenerated long-tailed pair in the first stage is
at the limit of its linear input signal-handling capability. The
transfer characteristic beyond this point then depends on
the exact configuration of the degenerated long-tailed pair
in the first stage.
Five stages are used in the TDA8780M to provide a 72 dB
true logarithmic dynamic range. The DC bias current in the
undegenerated long-tailed pair in the first stage is made
externally adjustable, using an off-chip resistor, to provide
a small-signal gain adjustment facility. The small signal
gain defined by this resistor is valid when the IC is
operating in the "linear" mode, for input signals typically
less than 60
V.
A high-level limiter is inserted between the first and second
stages to provide a constant limiting output voltage which
is essentially independent of the value of the gain setting
resistor. These stages can be driven by single-ended or
differential inputs. The DC operating point is set by overall
on-chip feedback decoupled by two off-chip capacitors
which define the low-frequency cut-off point. The
performance is stabilized against temperature and DC
power supply variations. The input to the true logarithmic
amplifier is protected against damage due to excessive
differential input signals by diodes.
The differential output from the true logarithmic amplifier is
converted internally to a single-ended output by an on-chip
operational amplifier arrangement in which the DC output
level is set by an externally-supplied reference voltage.
The output is capable of driving loads down to 10 k
. The
limiting output voltage and the output drive capability have
been chosen to facilitate interfacing to analog-to-digital
converters. A major part of the DC power supply current
consumption of the device is associated with provision of
this output drive capability. The DC power supply
consumption is significantly less when the device is driving
smaller loads.
A power-down facility allows the circuit to be disabled from
a TTL-level compatible control input.
1995 Jul 25
6
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
HANDLING
Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe, it is
desirable to take normal precautions appropriate to handling MOS devices.
ESD in accordance with
"MIL STD 883C" - "Method 3015".
CHARACTERISTICS
V
P
= 5 V; T
amb
= 25
C; V
ref
= 2.5 V; V
in
at f
in
= 10.7 MHz; R
g
= 3.3 k
; output not loaded; unless otherwise specified.
Signal values expressed as peak voltages mV (peak),
V (peak) or dBm (50
).
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
P
supply voltage
-
0.3
+6.0
V
V
i
input voltage all other pins referenced to ground
-
0.3
V
P
+ 0.3
V
T
amb
operating ambient temperature
-
20
+75
C
T
stg
IC storage temperature
-
55
+150
C
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
V
P
supply voltage
4.5
5.0
5.5
V
I
P
supply current
V
P
= 5.5 V; V
in
= 1 V
-
5.4
6.7
mA
V
P
= 5.0 V; V
in
= 1 V
-
4.9
6.2
mA
I
P(PD)
supply current in power-down
output not loaded
-
40
200
A
R
L
= 10 k
-
100
250
A
t
sw
switching time
see Fig.6
-
70
-
s
Reference input (pin 8)
V
ref
external reference voltage input
2.0
2.5
V
P
-
2.0 V
R
ref
external reference resistance input
-
40
-
k
Inputs (pins 1 and 20)
f
in
input operating frequency
note 1
1.0
10.7
15
MHz
R
diff
differential small-signal input
resistance
V
in
= 10 mV
-
10
-
k
C
diff
differential input capacitance
-
2
-
pF
V
in(min)
input voltage level at start of
logarithmic characteristic
-
60
-
V
V
in(top)
input voltage level at top end of
logarithmic characteristic
-
300
-
mV
V
in(max)
maximum input signal voltage
input protection diodes not
conducting
-
1
-
V
V
in
input voltage level spread across
logarithmic range
over whole T
amb
and V
P
range
-
2.5
-
dB
1995 Jul 25
7
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
Note
1. With some changes in application the lower input frequency limit can be lowered.
Output (pin 13)
V
os
DC offset voltage (V
out
to V
ref
)
no input signal
-
60
+40
+140
mV
V
out
output voltage level across
logarithmic range
V
in
= 60
V (
-
71.4 dBm)
45
80
115
mV
V
in
= 400
V (
-
54.9 dBm)
200
245
290
mV
V
in
= 3 mV (
-
37.4 dBm)
365
440
495
mV
V
in
= 25 mV (
-
19.0 dBm)
530
610
690
mV
V
in
= 200 mV (
-
1.0 dBm)
680
780
880
mV
V
in
= 300 mV (+2.6 dBm)
710
820
930
mV
R
g
= 0; V
in
= 3 mV; see Fig.3
-
530
-
mV
R
g
=
; V
in
= 3 mV; see Fig.3
-
360
-
mV
V
out(lim)
limiting output voltage
V
in
= 1 V (+13.0 dBm)
750
950
1050
mV
spread in output phase transfer
characteristic across logarithmic
range
-
15
-
f
lf
low frequency cut-off point (3 dB)
see Fig.6
-
-
0.1
MHz
G
flat
gain flatness at 1 to 15 MHz
V
in
= 10 mV
-
0.5
1.5
dB
R
13
output resistance
-
150
-
Logic input (pin 16)
V
IL
LOW level input voltage
0
-
0.8
V
V
IH
HIGH level input voltage
2
-
V
P
V
I
LI
input leakage current
V
IL
= 0 to V
P
-
1
-
+1
A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
1995 Jul 25
8
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
handbook, halfpage
80
20
1000
0
200
MLD209
400
600
800
60
40
20
0
Vout
(mV)
V (dBm, 50
)
in
R = 0
g
R = 3.3 k
g
R =
g
Fig.3 Output voltage dependence on R
g
.
V
CC
= 5 V; V
ref
= 2.5 V; f
in
= 10 MHz; T
amb
= 25
C.
Fig.4 Typical transfer characteristics.
handbook, halfpage
80
20
1000
0
200
MGC118
400
600
800
60
40
20
0
Vout
(mV)
V (dBm, 50
)
in
Fig.5 Typical small signal gain.
handbook, halfpage
0
100
0
25
MGC666
50
75
100
50
Vout
(mV)
V
in
(
V)
Rg =
Rg = 0
Rg = 3.3 k
1995 Jul 25
9
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
APPLICATION INFORMATION
The circuit is typically connected as shown in Fig.6. The
single-ended 10.7 MHz input IF signal is applied
(arbitrarily) to one of the two input pins via a ceramic filter.
These inputs should not be DC coupled as this will disable
the on-chip feedback which sets the DC operating point of
the true logarithmic amplifier. The relatively high
impedance of these inputs facilitates correct termination of
the ceramic filter by an off-chip resistor.
The low-frequency cut-off point is determined by the value
of capacitors connected to pins 6 and 15 which decouple
the overall DC feedback and the value of the input coupling
capacitors. The output is coupled to an analog-to-digital
converter thus the value of the voltage fed to the reference
voltage input is not critical. It could be useful in other
applications, where the output may be DC coupled to an
alternative analog-to-digital converter, to derive this
reference voltage from the centre of the input resistor
chain of the analog-to-digital converter.
Fig.6 Typical application diagram.
handbook, full pagewidth
100 pF
100 pF
33 pF
56 pF
100 pF
56 pF
330
3.3 k
R g
C lf
C lf
V ref
Vout
VP
C DEC1
C DEC2
Vin
Vin
GND1
Rg
IF input
IF filter 10.7 MHz
GND2
GND4
GND5
CE
TEST
GND3
2.5 V
circuit
enable
input
n.c.
n.c.
TDA8780M
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
5 V
47 nF
2.2 nF
output to
ADC
MGC117
1995 Jul 25
10
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
PACKAGE OUTLINE
UNIT
A
1
A
2
A
3
b
p
c
D
(1)
E
(1)
(1)
e
H
E
L
L
p
Q
Z
y
w
v
REFERENCES
OUTLINE
VERSION
EUROPEAN
PROJECTION
ISSUE DATE
IEC
JEDEC
EIAJ
mm
0.15
0
1.4
1.2
0.32
0.20
0.20
0.13
6.6
6.4
4.5
4.3
0.65
1.0
0.2
6.6
6.2
0.65
0.45
0.48
0.18
10
0
o
o
0.13
0.1
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.20 mm maximum per side are not included.
0.75
0.45
SOT266-1
90-04-05
95-02-25
w
M
A
A
1
A
2
b
p
D
H
E
L
p
Q
detail X
E
Z
e
c
L
v
M
A
X
(A )
3
A
y
0.25
1
10
20
11
pin 1 index
0
2.5
5 mm
scale
SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
A
max.
1.5
1995 Jul 25
11
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
"IC Package Databook" (order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all SO
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
method. Typical reflow temperatures range from
215 to 250
C.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45
C.
Wave soldering
Wave soldering techniques can be used for all SO
packages if the following conditions are observed:
A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave) soldering
technique should be used.
The longitudinal axis of the package footprint must be
parallel to the solder flow.
The package footprint must incorporate solder thieves at
the downstream end.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260
C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150
C within
6 seconds. Typical dwell time is 4 seconds at 250
C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300
C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320
C.
1995 Jul 25
12
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
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.
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.
Limiting values
Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or
more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation
of the device at these or at any other conditions above those given in the Characteristics sections of the specification
is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information
Where application information is given, it is advisory and does not form part of the specification.
1995 Jul 25
13
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
NOTES
1995 Jul 25
14
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
NOTES
1995 Jul 25
15
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
NOTES
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TAIPEI 100, Tel. (02)388 7666, Fax. (02)382 4382
Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd.,
209/2 Sanpavuth-Bangna Road Prakanong,
Bangkok 10260, THAILAND,
Tel. (662)398-0141, Fax. (662)398-3319
Turkey: Talatpasa Cad. No. 5, 80640 GLTEPE/ISTANBUL,
Tel. (0 212)279 27 70, Fax. (0212)282 67 07
United Kingdom: Philips Semiconductors LTD.,
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Tel. (0181)730-5000, Fax. (0181)754-8421
United States: 811 East Arques Avenue, SUNNYVALE,
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Uruguay: Coronel Mora 433, MONTEVIDEO,
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Internet: http://www.semiconductors.philips.com/ps/
For all other countries apply to: Philips Semiconductors,
International Marketing and Sales, Building BE-p,
P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands,
Telex 35000 phtcnl, Fax. +31-40-724825 (from 10-10-1995: +31-40-2724825)
SCD41
Philips Electronics N.V. 1995
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Date of release: 1995 Jul 25
Document order number:
9397 750 00234