PHILIPS TDA8780M

INTEGRATED CIRCUITS
DATA SHEET
TDA8780M
True logarithmic amplifier
Product specification
Supersedes data of November 1994
File under Integrated Circuits, IC03
1995 Jul 25
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
A unique feature is the smooth “changeover” from linear
operation (inputs less than 60 µV) to logarithmic mode.
FEATURES
• 72 dB true logarithmic dynamic range
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.
• 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.
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.
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.
QUICK REFERENCE DATA
SYMBOL
PARAMETER
MIN.
TYP.
MAX.
VP
supply voltage
4.5
5.0
5.5
UNIT
V
IP
supply current
−
−
6.7
mA
IP(PD)
supply current in power-down mode
−
−
250
µA
fin
operating input frequency
−
−
15
MHz
Vin(M)
dynamic logarithmic input voltage (peak value)
0.06
−
300
mV
Tamb
operating ambient temperature
−20
−
+75
°C
ORDERING INFORMATION
PACKAGE
TYPE NUMBER
NAME
TDA8780M
1995 Jul 25
SSOP20
DESCRIPTION
plastic shrink small outline package; 20 leads; body width 4.4 mm
2
VERSION
SOT266-1
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
BLOCK DIAGRAM
dbook, full pagewidth
VP
11
C lf
V in
V in
C lf
CE
C DEC1
C DEC2
6
100 k Ω
100 k Ω
20 kΩ
20 kΩ
1
13
20
20 kΩ
15
100 k Ω
8
100 k Ω
20 kΩ
17
V ref
TEST
16
3
TDA8780M
CONTROL
18
4
5
2
7
10
14
19
GND1 GND2 GND3 GND4 GND5
Rg
Rg
Fig.1 Block diagram.
1995 Jul 25
Vout
3
MBE161
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
PINNING
SYMBOL
PIN
DESCRIPTION
Vin
1
signal voltage input
GND1
2
ground 1
CDEC1
3
control circuit first decoupling and
optional start-up capacitor connection
Rg
4
small-signal gain-setting resistor
Rg
5
small-signal complementary
gain-setting resistor
handbook, halfpage
V in
1
20 V in
GND1
2
19
GND5
C DEC1
3
18
C DEC2
Rg
4
17
TEST
5
16
CE
Clf
6
low-frequency cut-off point setting
capacitor
GND2
7
ground 2
Vref
8
external reference voltage input
n.c.
9
not connected
Rg
GND3
10
ground 3 (main ground)
C lf
6
15
C lf
VP
11
power supply
GND2
7
14
GND4
n.c.
12
not connected
V ref
8
13 Vout
Vout
13
true logarithmic voltage output
n.c.
9
12
GND4
14
ground 4
Clf
15
complementary low-frequency cut-off
point setting capacitor
GND3
10
11 VP
CE
16
TTL-level-compatible circuit enable
input (active HIGH)
TEST
17
test input; connected to ground in
normal operation
CDEC2
18
control circuit second decoupling and
optional start-up capacitor
GND5
19
ground 5
Vin
20
complementary signal voltage input
1995 Jul 25
TDA8780M
n.c.
MBE160
Fig.2 Pin configuration.
4
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
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.
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.
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 kΩ. 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.
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 µV.
1995 Jul 25
A power-down facility allows the circuit to be disabled from
a TTL-level compatible control input.
5
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
VP
supply voltage
−0.3
+6.0
V
Vi
input voltage all other pins referenced to ground
−0.3
VP + 0.3
V
Tamb
operating ambient temperature
−20
+75
°C
Tstg
IC storage temperature
−55
+150
°C
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
VP = 5 V; Tamb = 25 °C; Vref = 2.5 V; Vin at fin = 10.7 MHz; Rg = 3.3 kΩ; output not loaded; unless otherwise specified.
Signal values expressed as peak voltages mV (peak), µV (peak) or dBm (50 Ω).
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
VP
supply voltage
IP
supply current
IP(PD)
supply current in power-down
tsw
switching time
4.5
5.0
5.5
V
VP = 5.5 V; Vin = 1 V
−
5.4
6.7
mA
VP = 5.0 V; Vin = 1 V
−
4.9
6.2
mA
output not loaded
−
40
200
µA
RL = 10 kΩ
−
100
250
µA
see Fig.6
−
70
−
µs
Reference input (pin 8)
Vref
external reference voltage input
2.0
2.5
VP − 2.0 V
Rref
external reference resistance input
−
40
−
kΩ
Inputs (pins 1 and 20)
fin
input operating frequency
note 1
1.0
10.7
15
MHz
Rdiff
differential small-signal input
resistance
Vin = 10 mV
−
10
−
kΩ
Cdiff
differential input capacitance
−
2
−
pF
Vin(min)
input voltage level at start of
logarithmic characteristic
−
60
−
µV
Vin(top)
input voltage level at top end of
logarithmic characteristic
−
300
−
mV
Vin(max)
maximum input signal voltage
input protection diodes not
conducting
−
1
−
V
∆Vin
input voltage level spread across
logarithmic range
over whole Tamb and VP range −
±2.5
−
dB
1995 Jul 25
6
Philips Semiconductors
Product specification
True logarithmic amplifier
SYMBOL
PARAMETER
TDA8780M
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Output (pin 13)
Vos
DC offset voltage (Vout to Vref)
no input signal
−60
+40
+140
mV
Vout
output voltage level across
logarithmic range
Vin = 60 µV (−71.4 dBm)
45
80
115
mV
Vin = 400 µV (−54.9 dBm)
200
245
290
mV
Vin = 3 mV (−37.4 dBm)
365
440
495
mV
Vin = 25 mV (−19.0 dBm)
530
610
690
mV
Vin = 200 mV (−1.0 dBm)
680
780
880
mV
Vin = 300 mV (+2.6 dBm)
710
820
930
mV
Rg = 0; Vin = 3 mV; see Fig.3
−
530
−
mV
Rg = ∞; Vin = 3 mV; see Fig.3
−
360
−
mV
Vin = 1 V (+13.0 dBm)
750
950
1050
mV
−
15
−
Vout(lim)
limiting output voltage
∆ϕ
spread in output phase transfer
characteristic across logarithmic
range
flf
low frequency cut-off point (3 dB)
see Fig.6
−
−
0.1
MHz
Gflat
gain flatness at 1 to 15 MHz
Vin = 10 mV
−
0.5
1.5
dB
R13
output resistance
−
150
−
Ω
0
−
0.8
V
Logic input (pin 16)
VIL
LOW level input voltage
VIH
HIGH level input voltage
ILI
input leakage current
VIL = 0 to VP
2
−
VP
V
−1
−
+1
µA
Note
1. With some changes in application the lower input frequency limit can be lowered.
1995 Jul 25
7
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
MLD209
1000
MGC118
1000
handbook, halfpage
handbook, halfpage
V out
(mV)
V out
(mV)
800
800
600
600
Rg = 0
Rg = 3.3 kΩ
Rg = ∞
400
400
200
200
0
80
60
40
20
0
80
20
0
Vin (dBm, 50 Ω)
60
40
20
0
20
Vin (dBm, 50 Ω)
VCC = 5 V; Vref = 2.5 V; fin = 10 MHz; Tamb = 25 °C.
Fig.3 Output voltage dependence on Rg.
Fig.4 Typical transfer characteristics.
MGC666
100
handbook, halfpage
V out
(mV)
75
50
Rg = 0
Rg = 3.3 kΩ
Rg = ∞
25
0
0
50
Vin (µV)
100
Fig.5 Typical small signal gain.
1995 Jul 25
8
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
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.
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.
IF filter 10.7 MHz
handbook, full pagewidth
100 pF
IF input
V in
GND1
330 Ω
C DEC1
1
20
2
19
3
18
V in
GND5
C DEC2
100 pF
33 pF
Rg
3.3 kΩ
56 pF
Rg
C lf
GND2
2.5 V
100 pF
V ref
n.c.
GND3
4
17
5
16
TDA8780M
6
15
7
14
8
13
9
12
10
11
TEST
CE
C lf
56 pF
GND4
V out
VP
MGC117
Fig.6 Typical application diagram.
9
output to
ADC
n.c.
2.2 nF
1995 Jul 25
circuit
enable
input
5V
47 nF
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
PACKAGE OUTLINE
SSOP20: plastic shrink small outline package; 20 leads; body width 4.4 mm
D
SOT266-1
E
A
X
c
y
HE
v M A
Z
11
20
Q
A2
A
(A 3)
A1
pin 1 index
θ
Lp
L
1
10
detail X
w M
bp
e
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HE
L
Lp
Q
v
w
y
Z (1)
θ
mm
1.5
0.15
0
1.4
1.2
0.25
0.32
0.20
0.20
0.13
6.6
6.4
4.5
4.3
0.65
6.6
6.2
1.0
0.75
0.45
0.65
0.45
0.2
0.13
0.1
0.48
0.18
10
0o
Note
1. Plastic or metal protrusions of 0.20 mm maximum per side are not included.
OUTLINE
VERSION
REFERENCES
IEC
JEDEC
EIAJ
ISSUE DATE
90-04-05
95-02-25
SOT266-1
1995 Jul 25
EUROPEAN
PROJECTION
10
o
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
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.
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.
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.
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).
Repairing soldered joints
Fix the component by first soldering two diagonallyopposite 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.
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.
1995 Jul 25
11
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
DEFINITIONS
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.
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.
1995 Jul 25
12
Philips Semiconductors
Product specification
True logarithmic amplifier
TDA8780M
NOTES
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
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Date of release: 1995 Jul 25
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