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参数资料
| 型号： | TDA7421N |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | TQFP-64 |
| 文件页数： | 45/47页 |
| 文件大小： | 374K |
| 代理商： | TDA7421N |
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TDA7421N
Pin description
2
Pin description
Figure 2.
Pin connection (top view)
Table 2.
Pin description
Pin #
Pin name
Function
1
AM MIX1 IN -
AM 1st mixer negative input (differential -)
2
AM MIX1 IN +
AM 1st mixer positive input (differential +)
3
FM MIX1 IN -
FM mixer negative input (differential -)
4
FM MIX1 IN +
FM mixer positive input (differential +)
5
FM RF AGC IN
RF AGC input
6
FM AGC OUT
FM AGC output voltage
7
RF GND
RF ground
8
VCO B
Local oscillator input to the transistor base
9
VCO E
Local oscillator input to the transistor emitter
10
OSC GND
Oscillator ground
11
XTAL D
Crystal oscillator MOS amplifier output
12
XTAL G
Crystal oscillator MOS amplifier input
13
OSC VCC
Oscillator positive supply
14
FM ANT ADJ
Tuning varicap voltage for antenna FM filter
1
2
3
5
6
4
7
8
9
10
27
11
28 29 30 31 32
59 58 57 56
54
55
53 52 51 50 49
43
42
41
39
38
40
48
47
46
44
45
FM AGC OUT
FM RF AGC IN
FM MIX IN +
AM MIX1 IN +
AM MIX1 IN -
FM MIX IN -
XTAL D
OSC GND
VCO E
RF GND
VCO B
PLL
GND
SLEEP
SDA
SCL
DIG
GND
DIG
VDD
IFC
SSTOP
AM
STEREO
OUT
CLN
GND
IF2
GND
AM
AGC2
TC
AM
DET
FM
IF
AGC
IN
AM
MIX2
IN
+
AM
MIX2
IN-
RF
VCC
AM
SMETER
TC
AM
MIX2
OUT
FM
IF
AMP1
IN
+
FM
IF
AMP1
IN
-
FM
IF
AMP1
OUT
FM
IF
AMP2
IN
+
FM
IF
AMP2
IN
-
FM BW TC
FM MUTE DRIVE
FM SMETER AM SMETER
FM DET ADJ
FM QUAD+
FM SD AM SD
FM IF AMP2 OUT
IF1 VCC
FM LIM IN +
IF1 GND
FM LIM IN -
D98AU909
22 23 24 25 26
60
MIX
OUT
-
61
MIX
OUT
+
62
AM
AGC1
TC
63
AM
AGC1
RF
AMP
64
AM
AGC1
PIN
LP
OUT
LP
IN1
LP
IN2
LP
IN3
PLL
VREF
17 18 19 20 21
37
36
34
33
35
FM QUAD-
IF2 VCC
AM REF
AM BPF
AM IF2 IN
12
13
14
15
16
PLL VCC
FM RF ADJ
FM ANT ADJ
XTAL G
OSC VCC
AUDIO OUT
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