SA647 Просмотр технического описания (PDF) - Philips Electronics
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SA647 Datasheet PDF : 14 Pages
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Philips Semiconductors
Low-voltage digital IF receiver
Product specification
SA647
DESCRIPTION
The SA647 is a low-voltage high performance monolithic digital
system with high-speed RSSI incorporating a mixer, oscillator with
buffered output, two limiting intermediate frequency amplifiers, fast
logarithmic received signal strength indicator (RSSI), voltage
regulator, RSSI op amp and power down pin. The SA647 is
available in TSSOP (thin shrink small outline package).
The SA647 was designed for portable digital communication
applications and will function down to 2.7V. The limiter amplifier has
differential outputs with 2MHz small signal bandwidth. The RSSI
output has access to the feedback pin. This enables the designer to
level adjust the outputs or add filtering.
FEATURES
• VCC = 2.7 to 5.5V
• Low power receiver (5.3mA @ 3V)
• Power down mode (ICC = 110µA)
• Fast RSSI rise and fall times
• Extended RSSI range with temperature compensation
• RSSI op amp
• 2MHz limiter small signal bandwidth
• Filter matching (1.5kΩ)
• Differential limiter output
• Oscillator buffer
• TSSOP-20 package
APPLICATIONS
• NADC (North American Digital Cellular)
• Digital receiver systems
• Cellular radio
PIN CONFIGURATION
RFIN+ 1
RFIN– 2
OSC E 3
OSC B 4
OSCBUF OUT 5
VCC 6
RSSI 7
RSSI FB 8
PD 9
LIM OUT (-) 10
20 MIXOUT
19 IF AMPDECOUP
18 IF AMPIN
17 IF AMPDECOUP
16 IF AMPOUT
15 GND
14 LIMIN
13 LIMDECOUP
12 LIMDECOUP
11 LIM OUT (+)
Figure 1.
SR01456
Pin Configuration
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Thin Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
–40 to +85°C
ORDER CODE
SA647DH
DWG #
SOT360–1
20
19
18
17
16
15
14
13
12
11
MIXER
+–
1
2
IF
AMP
GND
LIMITER
OSCILLATOR
FAST RSSI
+–
POWER
DOWN
E
B
VCC
3
4
5
6
7
8
Figure 2. Block Diagram
9
10
SR01727
1998 Aug 10
2
853–2037 19849
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