TDA7088T_2.pdf

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FM receiver circuit for battery supply
INTEGRATED CIRCUITS
DATA SHEET
TDA7088T
FM receiver circuit for battery
supply
Product specication
Supersedes data of January 1991
File under Integrated Circuits, IC01
1996 May 14
104212815.023.png
Philips Semiconductors
Product specication
FM receiver circuit for battery supply
TDA7088T
FEATURES
GENERAL DESCRIPTION
·
Equipped with all stages of a mono receiver from
antenna to audio output
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.
·
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.
QUICK REFERENCE DATA
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)
3 dB; V oAF = 0 dB
at V i = 1 mV; mute off
-
-
3
6
m
V
signal handling
D
f =
±
75 kHz; THD < 10%
100
200
-
mV
V o(rms)
audio output signal (RMS
value)
R L = 22 k W
60
85
120
mV
T amb
operating ambient temperature
-
10
-
+70
°
C
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA7088T
SO16
plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
1996 May 14
2
V oAF =
104212815.024.png 104212815.025.png
V P
3.3 nF
180 pF
3.9 nF
470 pF
330 pF
0.1
m
F
22 nF
run
6
7
8
9
10
13
15
3
11
6 k
W
IF
LIMITER
5 .4 k
W
2 .2 k
W
2 .2 k
W
+ 1
82
pF
5 k
W
ALLPASS
FILTER
V 1
70
nH
MIXER
68
pF
10 k
W
V P
12
TDA7088T
DEMODULATOR
220 pF
5
6 k
W
BB910
LOOP FILTER
L1
78
nH
VCO
V2
680
pF
V P
4
AF
10 nF
- 1
V2
14
3 V
5.6
k
V 2
W
´
&
+
+
AF
16
0.1
m
F
SEARCH
TUNING
V3
R
MUTE
S
reset
0.1
m
F
1
2
MEH089
V oAF
1.8 nF
22 k W
V1, V2 and V3 are internal voltages.
Fig.1 Block diagram and application circuit for search tuning.
104212815.026.png 104212815.001.png 104212815.002.png 104212815.003.png 104212815.004.png 104212815.005.png 104212815.006.png 104212815.007.png 104212815.008.png 104212815.009.png 104212815.010.png 104212815.011.png 104212815.012.png 104212815.013.png 104212815.014.png 104212815.015.png 104212815.016.png 104212815.017.png 104212815.018.png 104212815.019.png
Philips Semiconductors
Product specication
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 lter
V P
4
+3 V supply voltage
OSC
5
oscillator resonant circuit
handbook, halfpage
MUTE
1
16
TUNE
IFFB
6
IF feedback
V oAF
LOOP
2
15
C AP
GND
C LP1
7
low-pass capacitor of 1 dB amplier
3
14
V oIF
8
IF output to external coupling
capacitor (high-pass)
V P
OSC
4
13
C LIM
V iRF
TDA7088T
V iIF
9
IF input to limiter amplier
5
12
C LP2
10 low-pass capacitor of IF limiter
amplier
IFFB
6
11
V iRF
C LP1
7
10
C LP2
V iRF
11 radio frequency input
V iRF
12 radio frequency input
V oIF
8
9
V iIF
C LIM
13 limiter offset voltage capacitor
MGE664
GND
14 ground (0 V)
C AP
15 all-pass lter capacitor/input for
search tuning
Fig.2 Pin configuration.
TUNE
16 electrical tuning/AFC output
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
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
-
-
-
Note
1. There is no special ESD protection circuit built-in; ESD data on request.
1996 May 14
4
°
104212815.020.png 104212815.021.png
Philips Semiconductors
Product specication
FM receiver circuit for battery supply
TDA7088T
DC CHARACTERISTICS
V P = 3 V; T amb = 25
°
C; unless otherwise specied.
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
m
A
I 5
oscillator current on pin 5
275
375
500
m A
AC CHARACTERISTICS
V P = 3 V; T amb = 25
°
C; f iRF = 96 MHz modulated with f mod = 1 kHz and
±
22.5 kHz deviation; V i = 400
m
V (measured as
EMF; R S = 75 W ) and measurements taken in Fig.4; unless otherwise specied.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V i(rms)
RF sensitivity input voltage
(RMS value)
3 dB; V oAF = 0 dB
at V i = 1 mV; see Fig.3
mute off
-
-
3
6
m
V
mute on
3
6
12
m V
-------------- 26 dB
+
N
=
-
5
10
m
V
signal handling
D
f =
±
75 kHz; THD < 10% 100
200
-
mV
S N
+
N
signal plus noise-to-noise ratio see Fig.3
52
56
-
dB
THD
total harmonic distortion
D
f =
±
22.5 kHz
-
1
1.4
%
D
f =
±
75 kHz
-
2.4
3.3
%
a AM
AM suppression
75 kHz;
AM: 1 kHz; m = 0.8
±
47
52
-
dB
RR 1000
ripple rejection
100 mV RMS ripple on V P ;
f = 1 kHz
7
10
-
dB
V o(rms)
audio output signal (RMS value) R L = 22 k
W
60
85
120
mV
Search tuning (with BB910 and C 16 = 0.1
m
F) see Fig.1
V 16
minimum output voltage on
pin 16
limiting point
-
V P -
1.85
-
V
D
V/
D
t
tuning steepness
voltage at pin 16
95
210
420
mV/s
D f osc / D t
oscillator steepness
1.25
2.83
5.6
MHz/s
D
I AFC /
D
V 3
AFC steepness
voltage at pin 3
4.75
9.5
19
m
S
1996 May 14
5
V oAF =
S N
--------------
FM: 1 kHz;
104212815.022.png

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