UTC TDA7088 LINEAR INTEGRATED CIRCUIT
FM RECEIVER CIRCUIT FOR
BATTERY SUPPLY
DESCRIPTION
The UTC TDA7088 is a bipolar integrated circuit for use in
mono portable and pocket radios. It is used when a minimum
of peripheral components (of small dimensions and low costs)
is important. The circuit contains a frequency-lockedloop(FLL) system with an Intermediate Frequency (IF) of
about 70kHz. Selectivity is achieved by active RC-filters. Detuning related to the IF and too weak input signals is
suppressed by the mute circuit.
SOP-16
FEATURES
*Equipped with all stages of a mono receiver from antenna to
audio output.
*Mute circuit
*Search tuning with a single varicap diode
*Mechanical tuning with integrating AFC
*AM application supported
*Power supply polarity protection
*Power supply voltage down to 1.8V
APPLICATIONS
*Mechanical tuning ; this is possible with or
without integrating AFC circuit
*Electrical tuning; this is realized by one
directional (band-up) search tuning facility,
including RESET to the lower-band limit.
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL VALUE
MIN MAX
Supply Voltage Vp 0 5 V
Storage Temperature Tstg -55 +150 °C
Operating ambient temperature Tamb -10 70 °C
Electrostatic handling; note 1 Ves
Note 1: There is no special ESD protection circuit built-in; ESD data on request.
UNIT
UTC UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range,VCC=15V,f=1kHz,Unless otherwise specified)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
Supply Voltage Vp 1.8 3 5 V
Supply Current Ip 4.2 5.2 6.6 mA
Radio Input Frequency fiRF 0.5 110 MHz
RF sensitivity input voltage
(RMS value)
Signal handling ∆f=+-75kHz,THD<10% 100 200 mV
Audio Output Signal (RMS value) Vo(rms) RL=22kΩ 60 85 120 mV
Operating Ambient Temperature Tamb -10 70 °C
BLOCK DIAGRAM
Vi(rms) VOAF=-3dB, VOAF=0dB at
Vi=1mV, mute off
3 6 µV
UTC UNISONIC TECHNOLOGIES CO., LTD. 2
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
PIN SYMBOL DESCRIPTION
1 MUTE Mute output
2 VOAF Audio frequency output signal
3 LOOP AF loop filter
4 VP +3V supply voltage
5 OSC Oscillator resonant circuit
6 IFFB IF feedback
7 CLP1 Low-pass capacitor of 1 dB amplifier
8 VOIF IF output to external coupling capacitor (high-
pass)
9 ViLF IF input to limiter amplifier
10 CLP2 Low-pass capacitor of IF limiter amplifier
11 ViRF Radio frequency input
12 CiRF Radio frequency input
13 CLIM Limiter offset voltage capacitor
1
2
V
OAF
3
LOOP
4
V
P
5
OSC
6
IFFB
LP1
7
C
8 9
V
OIF
TDA7088
14 GND Ground(0V)
15 CAP All-pass filter capacitor/input for search tuning
Fig.2
16 TUNE Electrical tuning/AFC output
DC CHARACTERISTICS
Vp=3V,Tamb=25°C, unless otherwise specified.
PARAMETER SYMBOL MIN TYP MAX UNIT
Supply Voltage (pin4) Vp 1.8 3 5 V
Supply Current (pin4) Ip 4.2 5.2 6.6 mA
DC voltage on pin1 V1 2.5 2.55 2.6 V
DC voltage on pin3 V3 2.64 2.69 2.74 V
DC voltage on pins 6 and 7 V6,7 2.38 2.44 2.5 V
DC voltage on pin 8 V8 1.6 1.67 1.74 V
DC voltage on pin 9,10 and 13 V9,10,13 2.42 2.47 2.52 V
DC voltage on pins 11 and 12 V11,12 0.91 0.94 0.98 V
DC voltage on pin 15 V15 2.06 2.12 2.18 V
AF output current on pin2 I2 45 60 80 µA
Oscillator current on pin5 I5 275 375 500 µA
16MUTE
TUNE
15
C
14
GND
13
C
12
V
11
V
10
C
V
AP
LIM
iRF
iRF
LP2
iIF
UTC UNISONIC TECHNOLOGIES CO., LTD. 3
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
AC CHARACTERISTICS
Vp=3V,Tamb=25°C, fiRF=96MHz modulated with fmod=1kHz and +-22.5kHz deviation; Vi=400µV(measured as
EMF,Rs=75Ω) and measurements taken in Fig.4;unless otherwise specified.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
RF sensitivity input voltage (RMS
value)
Signal handling Vi(rms) ∆f=+-75kHz,THD<10% 100 200 mV
Signal plus noise-to-noise ratio (S+N)/N See Fig.3 52 56 dB
Total harmonic distortion THD ∆f=+-22.5kHz 1 1.4 %
AM suppression αAM FM:1kHz,+-75kHz,
Ripple rejection RR1000 100mV RMS ripple on Vp,f=1kHz 7 10 dB
Audio output signal (RMS value) Vo(rms) RL=22kΩ 60 85 120 mV
Search Tuning (with BB910 and C16=0.1µF) see Fig.1
Minimum output voltage on pin16 V16 Limiting point Vp -
Tuning steepness ∆V/∆t Voltage at pin16 95 210 420 mV/s
Oscillator steepness ∆Fosc/∆t 1.25 2.83 5.6 MHz/s
AFC steepness ∆IAFC/∆V3 Voltage at pin3 4.75 9.5 19 µS
Vi(rms) VOAF=-3dB;VOAF=0dB at
Vi=1mV;see Fig.3
Mute off
Mute on 3
(S+N)/N =26dB 5 10 µV
∆f=+-75kHz 2.4 3.3 %
AM:1kHz,m=0.8
3
6
6
12µVµV
47 52 dB
1.85
V
UTC UNISONIC TECHNOLOGIES CO., LTD. 4
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD. 5
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD. 6
QW-R110-016,A
UTC TDA7088 LINEAR INTEGRATED CIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD. 7
QW-R110-016,A
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