Philips Semiconductors
Preliminary specification
IS-54 IF receiver
SA638
DESCRIPTION
The SA638 is an IF receiver chip which serves the dual mode
functionality required by the IS鈥?4 standards for North American
cellular telephones. It provides for both the analog FM (AMPS
mode) and DQPSK (TDMA digital mode) IF receive functions in a
monolithic BiCMOS Integrated Circuit housed in a compact
SSOP鈥?4 plastic package.
PIN CONFIGURATION
RF
IN
RF BYPASS
XTAL OSC (EMITTER)
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IF AMP DECOUPLING
IF AMP IN
IF AMP DECOUPLING
IF AMP OUT
GND
LIMITER IN
LIMITER DECOUPLING
LIMITER DECOUPLING
LIMITER OUT
QUADRATURE IN
SWITCH OUT
APPLICATIONS
XTAL OSC (BASE)
V
CC
RSSI FEEDBACK
鈥?/div>
鈥?/div>
FEATURES
RSSI OUT
POWER DOWN CONTROL
DATA OUT
POSTAMP IN
POSTAMP OUT
SWITCH CONTROL
UPDATE for 638
SR00907
Figure 1. Pin Configuration
ORDERING INFORMATION
DESCRIPTION
24-Pin Plastic TSSOP (Thin Shrink Small Outline Package)
TEMPERATURE RANGE
-40 to +85擄C
ORDER CODE
SA638
DWG #
SOT-355
BLOCK DIAGRAM
24
23
22
21
20
19
18
17
16
15
14
13
IF
AMP
MIXER
GND
LIMITER
OSCILLATOR
FAST
RSSI
QUAD
V
CC
E
B
RSSI
鈥?+
PWR
DWN
+ 鈥?/div>
+ 鈥?/div>
UPDATE for 638
DATA
1
2
3
4
5
6
7
8
9
10
11
12
SR00908
Figure 2. Block Diagram
1995 Feb 16
1
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