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PDF SA638 Data sheet ( Hoja de datos )
| Número de pieza | SA638 | |
| Descripción | IS-54 IF receiver | |
| Fabricantes | Philips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SA638 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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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
RFIN
RF BYPASS
XTAL OSC (EMITTER)
XTAL OSC (BASE)
VCC
RSSI FEEDBACK
RSSI OUT
1
2
3
4
5
6
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
POSTAMP OUT
SWITCH CONTROL
10
11
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
VCC
–+
PWR
DWN
+–
+–
EB
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
1 page  
Philips Semiconductors
IS-54 IF receiver
Preliminary specification
SA638
IF BPF
OPTIONAL
BPF
Vcc
C48
MIXOUT
C42 C49 C43
IF AMP DC IF AMP IN Vmid
C52 C51
IF AMP OUT GND1 IQ DEMOD
DEMOD2/
OFFSETS GND2
IQ REF
VOLTAGE Vcc2
24 23 22 21 20 19 18 17 16 15 14
I
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
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet SA638.PDF ] | |
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