Philips TDA7088T-V1 Datasheet

DATA SH EET

Product specification
Supersedes data of January 1991
File under Integrated Circuits, IC01

1996 May 14

INTEGRATED CIRCUITS

TDA7088T

FM receiver circuit for battery
supply

1996 May 14 2

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

• 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.

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.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage 1.8 3 5 V

I

P

supply current 4.2 5.2 6.6 mA

f

iRF

radio input frequency 0.5 − 110 MHz

V

i(rms)

RF sensitivity input voltage
(RMS value)

V

oAF

= −3 dB; V

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
value)

RL= 22 kΩ 60 85 120 mV

T

amb

operating ambient temperature −10 − +70 °C

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA7088T SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

1996 May 14 3

Philips Semiconductors Product specification

FM receiver circuit for battery supply TDA7088T

BLOCK DIAGRAM AND APPLICATION CIRCUIT

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.

1996 May 14 4

Philips Semiconductors Product specification

FM receiver circuit for battery supply TDA7088T

PINNING

SYMBOL PIN DESCRIPTION

MUTE 1 mute output
V

oAF

2 audio frequency output signal
LOOP 3 AF loop filter
V

P

4 +3 V supply voltage
OSC 5 oscillator resonant circuit
IFFB 6 IF feedback
C

LP1

7 low-pass capacitor of 1 dB amplifier
V

oIF

8 IF output to external coupling

capacitor (high-pass)

V

iIF

9 IF input to limiter amplifier
C

LP2

10 low-pass capacitor of IF limiter

amplifier

V

iRF

11 radio frequency input

V

iRF

12 radio frequency input

C

LIM

13 limiter offset voltage capacitor
GND 14 ground (0 V)
C

AP

15 all-pass filter capacitor/input for

search tuning

TUNE 16 electrical tuning/AFC output

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

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Note

1. There is no special ESD protection circuit built-in; ESD data on request.

SYMBOL PARAMETER MIN. MAX. UNIT

V

P

supply voltage 0 5 V

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature −10 +70 °C

V

es

electrostatic handling; note 1 − − −

1996 May 14 5

Philips Semiconductors Product specification

FM receiver circuit for battery supply TDA7088T

DC CHARACTERISTICS

VP= 3 V; T

amb

= 25 °C; unless otherwise specified.

AC CHARACTERISTICS

VP= 3 V; T

amb

= 25 °C; f

iRF

= 96 MHz modulated with f

mod

= 1 kHz and ±22.5 kHz deviation; Vi= 400 µV (measured as

EMF; R

S

= 75 Ω) and measurements taken in Fig.4; unless otherwise specified.

SYMBOL PARAMETER MIN. TYP. MAX. UNIT

V

P

supply voltage (pin 4) 1.8 3 5 V
I

P

supply current (pin 4) 4.2 5.2 6.6 mA
V

1

DC voltage on pin 1 2.50 2.55 2.60

V

V

3

DC voltage on pin 3 2.64 2.69 2.74

V

V

6, 7

DC voltage on pins 6 and 7 2.38 2.44 2.50

V

V

8

DC voltage on pin 8 1.60 1.67 1.74 V
V

9, 10,13

DC voltage on pins 9, 10 and 13 2.42 2.47 2.52 V
V

11,12

DC voltage on pins 11 and 12 0.91 0.94 0.98 V
V

15

DC voltage on pin 15 2.06 2.12 2.18 V
I

2

AF output current on pin 2 45 60 80 µA
I

5

oscillator current on pin 5 275 375 500 µA

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

i(rms)

RF sensitivity input voltage

(RMS value)

V

oAF

= −3 dB; V

oAF

= 0 dB

at Vi= 1 mV; see Fig.3

mute off − 3 6

µV

mute on 3 6 12

µV

− 5 10 µV

signal handling ∆f = ±75 kHz; THD < 10% 100 200 −

mV

signal plus noise-to-noise ratio see Fig.3 52 56 − dB
THD total harmonic distortion ∆f = ±22.5 kHz − 1 1.4

%

∆f = ±75 kHz − 2.4 3.3

%

α

AM

AM suppression FM: 1 kHz; ±75 kHz;

AM: 1 kHz; m = 0.8

47 52 −

dB

RR

1000

ripple rejection 100 mV RMS ripple on VP;

f = 1 kHz

7 10 − dB

V

o(rms)

audio output signal (RMS value) RL= 22 kΩ 60 85 120 mV
Search tuning (with BB910 and C

16

= 0.1 µF) see Fig.1

V

16

minimum output voltage on

pin 16

limiting point − VP− 1.85 − V

∆V/∆t tuning steepness voltage at pin 16 95 210 420 mV/s
∆f

osc

/∆t oscillator steepness 1.25 2.83 5.6 MHz/s

∆I

AFC

/∆V

3

AFC steepness voltage at pin 3 4.75 9.5 19 µS

S N

+

N

--------------

26 dB=

S N+

N

------------

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