SA637 Datasheet, PDF (1/11 Pages) NXP Semiconductors – Low-voltage digital IF receiver

Philips Semiconductors RF Communications Products
Low-voltage digital IF receiver
Product specification
SA637
DESCRIPTION
The SA637 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 SA637 is available in SSOP
(shrink small outline package).
The SA637 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
• V_CC = 2.7 to 5.5V
• Low power receiver (3.8mA @ 3V)
• Power down mode (I_CC = 110µA)
• Fast RSSI rise and fall times
• Extended RSSI range with temperature
compensation
• RSSI op amp
• 2MHz limiter small signal bandwidth
• 455kHz filter matching (1.5kΩ)
• Differential limiter output
• Oscillator buffer
• SSOP-20 package
APPLICATIONS
• ADC (American Digital Cellular)
• Digital receiver systems
• Cellular radio
PIN CONFIGURATION
DK Packages
RF_IN ¹
RF_IN ²
OSC E 3
OSC B 4
OSC 5
BUFFER
V_CC ⁶
RSSI ⁷
RSSI ₈
FEEDBACK
POWER ₉
DOWN
LIM OUT (-) 10
20 ^MIXER
OUTPUT
19 ^{IF AMP}
DECOUP
18 IF AMP IN
17 ^{IF AMP}
DECOUP
16 IF AMP OUT
15 GND
14 LIMITER IN
13 ^LIMITER
DECOUP
12 ^LIMITER
DECOUP
11 LIM OUT (+)
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA637DK
DWG #
1563
BLOCK DIAGRAM
20
19
18
17
16
MIXER
IF
AMP
OSCILLATOR
15
14
13
12
11
GND
LIMITER
FAST RSSI
+–
1
2
+–
POWER
DOWN
E
B
V_CC
3
4
5
6
7
8
9
10
October 27, 1993
2
853-1718 11205