Philips TDA1596T User manual

DATA SHEET
Product specification
File under Integrated Circuits, IC01 April 1991
INTEGRATED CIRCUITS
TDA1596T
IF amplifier/demodulator for FM
radio receivers

April 1991 2
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
GENERAL DESCRIPTION
The TDA1596T provides IF amplification, symmetrical quadrature demodulation and level detection for quality home and
car FM radio receivers and is suitable for both mono and stereo reception. It may also be applied to common front-ends,
stereo decoders and AM receiver circuits.
Features
•Simulates behaviour of a ratio detector (internal field strength and detuning-dependent voltage for dynamic AF signal
muting)
•Mono/stereo blend and field strength indication control voltage
•Three-state mode switch for FM, mute-on / FM, mute-off / FM-off
•Internal compensation of AF signal total harmonic distortion (THD)
•Two open collector stop pulse outputs for microcomputer tuning control (can be one stop pulse output by
wired-ANDing)
•Internal reference voltage source
•Built-in hum and ripple rejection circuits.
QUICK REFERENCE DATA
SEE ALSO DATA SHEET FOR TDA1596
PACKAGE OUTLINE
20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 August 12.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
VPSupply voltage (pin 1) 7.5 8.5 12.0 V
IPSupply current (pin 1) VP= 8.5 V; I2= I7= 0 mA −20 26 mA
V4(rms) AF output voltage (RMS value) V20(rms) = 10 mV 180 200 220 mV
S/N Signal-to-noise ratio V20(rms) = 10 mV; fm= 400 Hz;
∆f = 75 kHz −82 −dB
THD Total harmonic distortion V20(rms) = 10 mV; fm= 1 kHz;
I7= 0 mA; ∆f = 75 kHz; FM mute
on; without de-emphasis;
without detuning
−0.1 0.3 %
Tamb Operating ambient temperature
range −40 −+85 °C

April 1991 3
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
Fig.1 Block diagram and application circuit.
(1) Connecting pin 13 to ground is only allowed for measuring the current at pin 16. It is not for use in application. (2) In the FM, mute-on condition the unweighted level detector output is available from pin 3. In the FM, mute-off condition the variable resistor at pin 3 can be adjusted for
minimum 2nd harmonic distortion at pin 4.

April 1991 4
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
PINNING
1V
Psupply voltage
2 LVA level voltage adjustment
3 ULV unweighted level output/K2 adjustment
4 AF0 AF output
5V
ref reference voltage output
6 WLV weighted level voltage output
7 MSW mode switch
8 DDV detune detector voltage
9 n.c. not connected
10 DMI1 demodulator input 1
11 DMI2 demodulator input 2
12 n.c. not connected
13 TSW tau switch
14 ST1 stop pulse output 1
15 ST0 stop pulse output 0
16 MTV mute voltage
17 GND ground
18 LFD1 IF limiter feedback 1
19 LFD2 IF limiter feedback 2
20 IFI IF input Fig.2 Pinning diagram.

April 1991 5
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
FUNCTIONAL DESCRIPTION
Limiter-amplifier
This has five stages of IF amplification using balanced differential limiter-amplifiers with emitter--follower coupling.
Decoupling of the stages from the voltage supply lines and an internal high-ohmic DC feed-back loop give a very stable
IF performance. The amplifier gain is virtually independent from temperature changes.
FM demodulator
The demodulator is fully balanced and comprises two cross-coupled differential amplifiers. Quadrature detection of the
FM signal is performed by feeding one differential amplifier directly from the limiter--amplifier output, and the other via an
external 90°phase-shifting network. The demodulator has good stability and its zero cross-over shift is small. The
bandwidth of the demodulator output is restricted to approximately 1 MHz by an internal low-pass filter.
THD compensation
This circuit compensates non-linearities introduced by demodulation. For this to operate correctly the demodulator circuit
between pins 10 and 11 must have a loaded Q-factor of 19. Consequently there is no need for the demodulator tuned
circuit to be adjusted for minimum THD, instead the adjustment criterium is for a symmetrical stop pulse.
Mute attenuator and AF output
The control voltage for the mute attenuator at pin 16 is generated from the values of the level detector and the detuning
detector outputs. The mute attenuator has a fast attack and a slow decay which is determined by the capacitor at pin 16.
The AF signal is passed via the mute attenuator to the output at pin 4.
Aweightedcontrolvoltage,availablefrompin6,isobtainedfromthemuteattenuatorcontrolvoltageviaabuffer-amplifier
which introduces an additional voltage shift and gain.
Level detector
The level detector generates a voltage output which is proportional to the field strength of the input signal. The
unweighted level detector output is available when the mode switch is operating in the FM, mute-on condition.
Tuning-stop outputs
The open collector outputs STOP-0 and STOP-1 (from pins 15 and 14 respectively) are voltages derived from the
detuning level and the field strength of the input signal. If only one tuning-stop output is required, pins 14 and 15 may be
tied together.

April 1991 6
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
RATINGS
Limiting values in accordance with the Absolute Maximum System (IEC 134)
Note
1. Equivalent to discharging a 100 pF capacitor through a 1.5 kΩseries resistor.
THERMAL RESISTANCE
SYMBOL PARAMETER MIN. MAX. UNIT
VP= V1-17 Supply voltage (pin 1) −0.3 +16 V
V5-17 Reference voltage range (pin 5) −0.3 +10 V
V2-17 Level adjustment range (pin 2) −0.3 +10 V
V7-17 Mode switch voltage range (pin 7) −0.3 VPV
V13-17 Control input voltage range (pin 13) −+6V
THD compensation/unweighted field
V3-17 strength voltage range (pin 3) −0.3 VPV
Tuning-stop output voltage range
V15-17 STOP-0 (pin 15) −0.3 VPV
V14-17 STOP-1 (pin 14) −0.3 VPV
Tuning-stop output current
I15 STOP-0 (pin 15) −2mA
I
14 STOP-1 (pin 14) −2mA
T
stg Storage temperature range −55 +150 °C
Tamb Operating ambient temperature range −40 +85 °C
Electrostatic handling(1)
Ves all pins except pins 5 and 6 −2000 +2000 V
Ves pin 5 −2000 +900 V
Ves pin 6 −2000 +1600 V
From junction to ambient (in free air) Rth j-a (max.) = 95 K/W

April 1991 7
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
CHARACTERISTICS
f = 10.7 MHz; VP= V1-17 = 8.5 V; VI= V20 (rms) = 1 mV; Tamb = 25 °C; measured in the circuit of Fig.3; tuned circuit at pins
10, 11 aligned for symmetrical stop pulses; all voltages are referred to ground (pin 17), unless otherwise specified
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
Supplies
VP= V1Supply voltage 7.5 8.5 12.0 V
I1Supply current at I2= I7= 0 mA −20 26 mA
FM demodulator
R10-11 Input impedance 25 40 55 kΩ
C10-11 −6−pF
V4DC output voltage (no-signal condition) at
V10, 11(p-p) ≤100 µV; V20(rms) ≤5µV2.75 3.10 3.45 V
R4-17 Output impedance −400 −Ω
Mute attenuator control voltage
Control voltage (pin 16)
V16 at V20(rms) ≤5µV−2.0 −V
V16 at V20(rms) = 1 mV −3.45 −V
R10-17 Output impedance (pin 16) −−2.0 MΩ
V2Level shift input (pin 2) internal bias voltage at
I2= 0 mA −1.4 −V
R2-17 input impedance 15 −−kΩ
Internal muting (Fig.6)
Internal attenuation of signals
±22.5 kHz ≤detuning ≤ ±80 kHz;
A = 20log[∆V4(FM mute-off)/∆V4(FM)]
A at V16 ≥1 V5−0−dB
A at V16 = 0.77 V51.5 3.0 4.5 dB
A at V16 = 0.55 V5−20 −dB

April 1991 8
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
Attack and decay (pin 16)
Pin 13 connected to ground *
+I16 charge current −8−µA
−I
16 discharge current −120 −µA
Pin 13 connected to Vref
+I16 charge current −100 −µA
−I
16 discharge current −120 −µA
Level detector
Dependence of output voltage on temperature −3.3 −mV/VK
R6Output impedance −−500 Ω
Dependence of output voltage (pin 6) on input voltage
(pin 20) (Fig.7):
V6V20(rms) ≤5 µV; I2= I7= 0 mA 0.1 0.7 1.3 V
V6V20(rms) = 1 mV; I2= I7= 0 mA 3.0 3.6 4.2 V
Slope of output voltage (pin 6) for input voltage range
V20(rms) ≥50 µV to V20(rms) ≤50 mV 1.4 1.7 2.0 V/20 dB
Dependence of output voltage (pin 6) on detuning
(Fig.8) at input voltage V20(rms) = 10 mV:
∆V6detuning = ≤ ±45 kHz −−0.2 V
±∆f detuning for V6= 1.8 V 90 −160 kHz
V6detuning = ±200 kHz 0.5 0.7 0.9 V
|∆V6/∆f| Slope of output voltage with detuning = 125 ±20 kHz
at V20(rms) = 10 mV −35 −mV/kHz
Level shift control (pin 2) (Fig.9)
±∆V6adjustment range 1.6 2.0 −V
−(∆V6/∆V2) adjustment gain −1.7 −V
V6output voltage at V2= V5; V20(rms) ≤5 µV−−0.3 V
Low-pass filter at pin 8
Output voltage at I7= 0 mA;
V8V20(rms) ≤5 µV−2.2 −V
R8(int) Internal resistance 12 25 50 kΩ
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
V6 ∆
V6T∆
--------------
V6
∆
20 V20
log∆
----------------------------

April 1991 9
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
* Connecting pin 13 to ground is only allowed for measuring the current at pin 16. It is not for use in application.
* Without input voltage.
Tuning-stop detector (Figs 10 and 11)
Stop-0: detuning at V20(rms) = 10 mV
+∆f for V15 ≥3.5 V −−10 kHz
+∆f for V15 ≤0.3 V 18 −−kHz
Stop-1: detuning at V20(rms) = 10 mV
−∆f for V14 ≥3.5 V −−10 kHz
−∆f for V14 ≤0.3 V 18 −−kHz
Dependence of STOP-0, STOP-1 on
input voltage (pin 20)
input voltage (RMS value) for
V20(rms) V14 = V15 ≥3.5 V 250 −−µV
input voltage (RMS value) for
V20(rms) V14 = V15 ≤0.3 V −−50 µV
Output voltage when
V14, 15 I14 = I15 = 1 mA −−0.3 V
Mode switch and pin 3 (Fig.12)
FM-off position
Control voltage for 60 dB
V7muting depth −−1.4 V
FM, mute-on position (pin 3 = output)
Internal bias voltage at
V7R7-17 ≥10 MΩ−2.8 −V
|I7| Input current −−2.5 µA
Output voltage with
V3R3-17 = 10 kΩ; C3-17 ≥1 nF* −2−V
Output impedance for V20 =≤5µV;
R3-17 I3= 500µA−−100 Ω
FM, mute-off position (pin 3 = input)
V7Control voltage 0.9 V5−−V
I
7Input current at V7= V5−−15 µA
R3-17 Input resistance 1 −−MΩ
Reference voltage source
V5Output voltage at I5=−1 mA 3.3 3.7 4.1 V
∆V5/I5Output impedance at I5=−1 mA −40 80 Ω
TC Temperature coefficient −3.3 −mV/K
SYMBOL PARAMETER MIN. TYP. MAX. UNIT

April 1991 10
Philips Semiconductors Product specification
IF amplifier/demodulator for FM radio
receivers TDA1596T
OPERATING CHARACTERISTICS
f = 10.7 MHz; VI= V20(rms) = 1 mV; deviation (∆f) = 22.5 kHz; modulation frequency (fm) = 400 Hz; de-emphasiss (pin 4)
= 50 µs; test circuit as per Fig.3; tuned circuit (QL= 19) aligned for symmetrical stop pulses; Tamb =+25 °C; unless
otherwise specified
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
V4(rms) AF output voltage (RMS value) at
V20(rms) = 10 mV 180 200 220 mV
V20(rms) Start of limiting (FM, mute-off); (RMS value)
(Fig.13) 14 22 35 µV
Dependence of signal-to-noise ratio (in noise
frequency band 250 Hz to 15 kHz, unweighted)
on input voltage
V18(rms) for S/N = 26 dB −15 −µV
V
18(rms) for S/N = 46 dB −60 −µV
S/N at V20(rms) = 10 mV; ∆f = 75 kHz −82 −dB
THD THD (FM, mute-on) at V20(rms) = 10 mV; ∆f = 75
kHz; fm= 1 kHz; without detuning; without
de-emphasis; I7= 0 mA
−0.1 0.3 %
αDDynamic mute attenuation (Fig.14) −16 −dB
with fm= 100 kHz; ∆f = 75 kHz
αD∆f Slope of attenuation curve −0.8 −dB/kHz
THD (FM, mute-on) at V20(rms) = 10 mV;
∆f = 75 kHz; fm= 1 kHz;
detuning ≤± 25 kHz without
THD de-emphasis; I7= 0 mA (Fig.15) −−0.6 %
THD (FM, mute-off and compensated via
pin 3) at V20(rms) = 10 mV;
∆f = 75 kHz; fm= 1 kHz;
THD V7= V5−0.07 0.25 %
V3Voltage range at pin 3 for THD compensation 0 −V5V
AM suppression (FM, mute-off) with amplitude
modulation at 30% input voltage range
V20 = 300 µV to 100 mV (Fig.16)
−65 −dB
Power supply ripple rejection = 20log [∆V1/∆V4]33 36 −dB
Mute attenuation (FM-off)
= 20log [V4(FM-on/V4(FM-off)]60 −−dB
αD20 V4FM mute off )–(
V4FM mute,(on )–
---------------------------------------------------------log=