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TDA7421 Datasheet

  • TDA7421

  • AM/FM TUNER FOR CAR RADIO AND Hi-Fi APPLICATIONS

  • 38頁

  • STMICROELECTRONICS   STMICROELECTRONICS

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TDA7421
AM/FM TUNER FOR CAR RADIO
AND Hi-Fi APPLICATIONS
FRONT-END FOR AM/FM RECEIVERS
UP-CONVERSION ARCHITECTURE FOR AM
HIGH SPEED PLL WITH INLOCK DETECTOR
FOR OPTIMIZED RDS APPLICATIONS
SINGLE FREQUENCY REFERENCE FOR AM/FM
AM/FM STATION DETECTOR
碌P-CONTROLLED
COMPENSATION OF EX-
TERNAL COMPONENTS SPREAD
ADJUSTABLE AUDIO MUTE
FULLY PROGRAMMABLE BY I
2
C BUS
ADVANCED BICMOS TECHNOLOGY
GENERAL DESCRIPTION
The TDA7421 is a high performance tuner circuit
that integrates AM/FM sections, IF counter and
PLL synthesizer on a single chip.
Use of BICMOS technology allows the implemen-
tation of tuning functions with a minimum of exter-
nal components.
Value spread of external components can be fully
PINS CONNECTION
AM AGC1 RF AMP
FM IF AMP1 OUT
FM IF AMP1 IN +
FM IF AMP2 IN +
FM IF AMP1 IN -
AM AGC1 PIN
TQFP64
ORDERING NUMBER:
TDA7421
compensated by means of on-chip electrical ad-
justment controlled by external
碌P.
The Automatic Gain Control (AGC) operates on
different sensitivities and bandwidths in order to
improve sensitivity and dynamic range. I
2
C bus
allows to control selected functions of the tuner
(AGC and amplifiers gain, PLL and counters op-
eration modes).
AM AGC1 TC
MIX OUT +
MIX OUT -
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
AM MIX1 IN -
AM MIX1 IN +
FM MIX IN -
FM MIX IN +
FM RF AGC IN
FM AGC OUT
RF GND
VCO B
VCO E
OSC GND
XTAL D
XTAL G
OSC VCC
FM ANT ADJ
FM RF ADJ
PLL VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
DIG GND
IFC SSTOP AM
STEREO OUT
CLN GND
IF2 GND
AM AGC2 TC
PLL GND
PLL VREF
DIG VDD
AM DET
SLEEP
SDA
LP OUT
LP IN1
LP IN2
LP IN3
SCL
FM IF AMP2 IN -
AM MIX2 OUT +
AM MIX2 OUT -
FM IF AGC IN
AM MIX2 IN +
AM MIX2 IN-
RF VCC
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
FM IF AMP2 OUT
IF1 VCC
FM LIM IN +
FM LIM IN -
IF1 GND
FM BW TC
FM MUTE DRIVE
FM SMETER AM SMETER
FM DET ADJ
FM SD AM SD
AUDIO OUT
FM QUAD+
FM QUAD-
IF2 VCC
AM IF2 IN
AM REF
AM BPF
D96AU546A
June 1998
1/38

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