SA638 Datasheet, PDF (1/5 Pages) NXP Semiconductors – IS-54 IF receiver

Philips Semiconductors
IS-54 IF receiver
Preliminary specification
SA638
DESCRIPTION
The SA638 is an IF receiver chip which serves the dual mode
functionality required by the IS–54 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–24 plastic package.
APPLICATIONS
•
FEATURES
•
ORDERING INFORMATION
DESCRIPTION
24-Pin Plastic TSSOP (Thin Shrink Small Outline Package)
PIN CONFIGURATION
RF_IN 1
RF BYPASS ²
XTAL OSC (EMITTER) ³
XTAL OSC (BASE) ⁴
V_CC ⁵
RSSI FEEDBACK ⁶
RSSI OUT 7
24 _{MIXER OUT}
23 _{IF AMP DECOUPLING}
22 _{IF AMP IN}
21 IF AMP DECOUPLING
20 _{IF AMP OUT}
19 GND
18 LIMITER IN
POWER DOWN CONTROL ⁸
DATA OUT 9
17 LIMITER DECOUPLING
16 LIMITER DECOUPLING
POSTAMP IN ¹⁰
POSTAMP OUT ¹¹
SWITCH CONTROL ¹²
15 _{LIMITER OUT}
14 _{QUADRATURE IN}
13 _{SWITCH OUT}
UPDATE for 638
SR00907
Figure 1. Pin Configuration
TEMPERATURE RANGE ORDER CODE
-40 to +85°C
SA638
DWG #
SOT-355
BLOCK DIAGRAM
24 23 22 21
20 19 18 17 16 15
14 13
MIXER
IF
AMP
OSCILLATOR
GND
LIMITER
FAST
RSSI
QUAD
V_CC
–+
PWR
DWN
+–
+–
E
B
RSSI
DATA
UPDATE for 638
1
2
3
4
5
6
7
8
9
10
11 12
Figure 2. Block Diagram
SR00908
1995 Feb 16
1