SA638 データシートの表示（PDF） - Philips Electronics
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SA638 Datasheet PDF : 5 Pages
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Philips Semiconductors
IS-54 IF receiver
Preliminary specification
SA638
IF BPF
OPTIONAL
BPF
Vcc
C48
C42
C49
C43
C52
C51
DEMOD2/
IQ REF
MIXOUT
IF AMP DC IF AMP IN Vmid
IF AMP OUT GND1 IQ DEMOD
OFFSETS GND2
VOLTAGE Vcc2
I
24
23
22
21
20
19
18
17
16
15
14
13
IF AMP
LIMITER/
AGC
R35
r=R1
Vcc/2
BIAS GEN
+IN
OUT
–IN
Gm–C
LPF
R38
r=R1
LOW FREQUENCY
FEEDBACK TO NULL
DC OFFSETS
FROM IF AMP
AGC
DETECTOR
PWRDWN
MIXER
I–MIXER
Q–MIXER
GmC
LPF
MODE
CONTROL
DIVIDE /4
90 PHASE
FM
DEMOD
1
2
3
4
5
6
7
8
9
10
11
12
RF
_RF
OSCB
OSCE Vcc1
RSSI/AGC IN PWRDWN DEMOD
MODE
AUDIO/ DEMOD1
Q
OSC x4 SWITCH
LPF
Vcc
Figure 3. SA638 IS-54 Dual-Mode IF Chip
SR00909
1995 Feb 16
5
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