Philips tda7088t DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA7088T
FM receiver circuit for battery
supply
Product specification
Supersedes data of January 1991
File under Integrated Circuits, IC01
1996 May 14
Philips Semiconductors Product specification
FM receiver circuit for battery supply TDA7088T
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
GENERAL DESCRIPTION
The TDA7088T 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-locked-loop (FLL) system with an Intermediate
Frequency (IF) of about 70 kHz. Selectivity is achieved by
active RC-filters. De-tuning related to the IF and too weak
input signals is suppressed by the mute circuit.
• Power supply voltage down to 1.8 V.
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.
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
I
f
V
P
iRF
P
i(rms)
supply voltage 1.8 3 5 V
supply current 4.2 5.2 6.6 mA
radio input frequency 0.5 − 110 MHz
RF sensitivity input voltage
(RMS value)
V
= −3 dB; V
oAF
oAF
= 0 dB
at Vi= 1 mV; mute off
− 3 6 µV
signal handling ∆f = ±75 kHz; THD < 10% 100 200 − mV
V
o(rms)
audio output signal (RMS
RL= 22 kΩ 60 85 120 mV
value)
T
amb
operating ambient temperature −10 − +70 °C
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA7088T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
1996 May 14 2
Philips Semiconductors Product specification
handbook, full pagewidth
MEH089
MIXER
TDA7088T
VCO
14
16
1
2
315
run
13109876
AF
V2
L1
reset
&× +
+
R
MUTE
SEARCH
TUNING
S
ALLPASS
FILTER
10 kΩ
5.6
kΩ
2.2 kΩ 2.2 kΩ
6 kΩ
5.4 kΩ
6 kΩ
DEMODULATOR
22 nF
LOOP FILTER
AF
V2
V3
−1
5 kΩ
22 kΩ1.8 nF
0.1 µF
0.1 µF
0.1 µF
680
pF
10 nF
3 V
BB910
78
nH
70
nH
82
pF
+1
68
pF
220 pF
3.3 nF 3.9 nF
IF
LIMITER
180 pF
330 pF
470 pF
V1
V2
11
12
5
4
V
P
V
P
V
P
V
oAF
Fig.1 Block diagram and application circuit for search tuning.
V1, V2 and V3 are internal voltages.
FM receiver circuit for battery supply TDA7088T
BLOCK DIAGRAM AND APPLICATION CIRCUIT
1996 May 14 3
Philips Semiconductors Product specification
Fig.2 Pin configuration.
handbook, halfpage
TDA7088T
MGE664
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MUTE
V
oAF
LOOP
V
P
OSC
IFFB
C
LP1
V
oIF
TUNE
C
AP
GND
C
LIM
V
iRF
V
iRF
C
LP2
V
iIF
FM receiver circuit for battery supply TDA7088T
PINNING
SYMBOL PIN DESCRIPTION
MUTE 1 mute output
V
oAF
LOOP 3 AF loop filter
V
P
OSC 5 oscillator resonant circuit
IFFB 6 IF feedback
C
LP1
V
oIF
V
iIF
C
LP2
V
iRF
V
iRF
C
LIM
GND 14 ground (0 V)
C
AP
TUNE 16 electrical tuning/AFC output
2 audio frequency output signal
4 +3 V supply voltage
7 low-pass capacitor of 1 dB amplifier
8 IF output to external coupling
capacitor (high-pass)
9 IF input to limiter amplifier
10 low-pass capacitor of IF limiter
amplifier
11 radio frequency input
12 radio frequency input
13 limiter offset voltage capacitor
15 all-pass filter capacitor/input for
search tuning
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER MIN. MAX. UNIT
V
P
T
stg
T
amb
V
es
supply voltage 0 5 V
storage temperature −55 +150 °C
operating ambient temperature −10 +70 °C
electrostatic handling; note 1 − − −
Note
1. There is no special ESD protection circuit built-in; ESD data on request.
1996 May 14 4
Philips Semiconductors Product specification
+
--
FM receiver circuit for battery supply TDA7088T
DC CHARACTERISTICS
VP= 3 V; T
SYMBOL PARAMETER MIN. TYP. MAX. UNIT
V
P
I
P
V
1
V
3
V
6, 7
V
8
V
9, 10,13
V
11,12
V
15
I
2
I
5
= 25 °C; unless otherwise specified.
amb
supply voltage (pin 4) 1.8 3 5 V
supply current (pin 4) 4.2 5.2 6.6 mA
DC voltage on pin 1 2.50 2.55 2.60
DC voltage on pin 3 2.64 2.69 2.74
DC voltage on pins 6 and 7 2.38 2.44 2.50
DC voltage on pin 8 1.60 1.67 1.74 V
DC voltage on pins 9, 10 and 13 2.42 2.47 2.52 V
DC voltage on pins 11 and 12 0.91 0.94 0.98 V
DC voltage on pin 15 2.06 2.12 2.18 V
AF output current on pin 2 45 60 80 µA
oscillator current on pin 5 275 375 500 µA
V
V
V
AC CHARACTERISTICS
VP= 3 V; T
EMF; R
S
amb
= 25 °C; f
= 96 MHz modulated with f
iRF
= 1 kHz and ±22.5 kHz deviation; Vi= 400 µV (measured as
mod
= 75 Ω) and measurements taken in Fig.4; unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
i(rms)
S N+
-----------N
THD total harmonic distortion ∆f = ±22.5 kHz − 1 1.4
α
AM
RF sensitivity input voltage
(RMS value)
signal handling ∆f = ±75 kHz; THD < 10% 100 200 −
V
= −3 dB; V
oAF
oAF
= 0 dB
at Vi= 1 mV; see Fig.3
mute off − 3 6
mute on 3 6 12
S N
--------------
26 dB=
N
− 5 10 µV
µV
µV
mV
signal plus noise-to-noise ratio see Fig.3 52 56 − dB
%
∆f = ±75 kHz − 2.4 3.3
AM suppression FM: 1 kHz; ±75 kHz;
47 52 −
%
dB
AM: 1 kHz; m = 0.8
RR
1000
ripple rejection 100 mV RMS ripple on VP;
7 10 − dB
f = 1 kHz
V
o(rms)
Search tuning (with BB910 and C
V
16
audio output signal (RMS value) RL= 22 kΩ 60 85 120 mV
= 0.1 µF) see Fig.1
16
minimum output voltage on
limiting point − VP− 1.85 − V
pin 16
∆V/∆t tuning steepness voltage at pin 16 95 210 420 mV/s
∆f
/∆t oscillator steepness 1.25 2.83 5.6 MHz/s
osc
∆I
AFC
/∆V
AFC steepness voltage at pin 3 4.75 9.5 19 µS
3
1996 May 14 5
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