TDA7421 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7421' PDF : 38 Pages View PDF
TDA7421
Evaluation Board Schematic Circuit (part A)
30 dB differential gain
FM IN
SP
MIX_IN
50
TP20
100K
RFVcc
0
10n
From Cx - see schematic (part D)
0
4.7n
TP21
T1
5p
100K
1K
100n
22u +
0
100K
3.3p
0
1K5
6p
470
1K8
22p
15p
68p
L2
15p
10.25MHz
15p
1K5
4.7n
5K6
OSCVcc
10n
10n
6p
3p
1M
10n
1 AM MIX1 IN-
2 AM MIX1 IN+
3 FM MIX IN-
4 FM MIX IN+
5 FM RF AGC IN
6 FM AGC OUT
7 RF GND
8 VCO B
9 VCO E
10 OSC GND
11 XTAL D
12 XTAL
13 OSC VCC
14 FM ANT ADJ
15 FM RF ADJ
16 PLL VCC
+
10u
0
1K5
47n
From LPOUT - pin 17
Evaluation Board Schematic Circuit (part B)
From Rx
33n
4.7n
33K
2.7n
4K3
1n
18K
1
2
I2CBUS 3
4
5
22n
22n
+5V
10u
+
3.3n
TP18
+
2.2u
TP22
TP19
AM ST
33/38
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