Philips Semiconductors
Product specification
Low-voltage mixer FM IF system
SA676
DESCRIPTION
PIN CONFIGURATION
The SA676 is a low-voltage monolithic FM IF system incorporating a
mixer/oscillator, two limiting intermediate frequency amplifiers,
quadrature detector, logarithmic received signal strength indicator
(RSSI), voltage regulator and audio and RSSI op amps. The SA676
is available in a 20-pin SSOP (shrink small outline package).
DK Package
1
2
RF IN+
20 MIXER OUT
19
IF AMP DECOUPLING
RF IN– DECOUPLING
18 IF AMP IN
17
3
4
OSC
OUT
The SA676 was designed for cordless telephone applications in
which efficient and economic integrated solutions are required and
yet high performance is desirable. Although the product is not
targeted to meet the stringent specifications of high performance
cellular equipment, it will exceed the needs for analog cordless
phones. The minimal amount of external components and absence
of any external adjustments makes for a very economical solution.
IF AMP DECOUPLING
OSC
IN
16 IF AMP OUT
15 GND
RSSI OUT
5
6
7
V
CC
14 LIMITER IN
AUDIO FEEDBACK
AUDIO OUT
13
8
9
LIMITER DECOUPLING
12
RSSI FEEDBACK
LIMITER DECOUPLING
FEATURES
11 LIMITER OUT
QUADRATURE IN 10
• Low power consumption: 3.5mA typical at 3V
SR00514
• Mixer input to >100MHz
Figure 1. Pin Configuration
• Mixer conversion power gain of 17dB at 45MHz
• XTAL oscillator effective to 100MHz (L.C. oscillator or external
• Audio output internal op amp
oscillator can be used at higher frequencies)
• RSSI output internal op amp
• 102dB of IF Amp/Limiter gain
• Internal op amps with rail-to-rail outputs
• 2MHz IF amp/limiter small signal bandwidth
• ESD protection: Human Body Model 2kV
• Temperature compensated logarithmic Received Signal Strength
Robot Model 200V
Indicator (RSSI) with a 70dB dynamic range
• Low external component count; suitable for crystal/ceramic/LC
APPLICATION
• Cordless phones
filters
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
SA676DK
DWG #
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
-40 to +85°C
SOT266-1
BLOCK DIAGRAM
20
19
18
17
16
15
14
13
12
11
IF
AMP
LIMITER
RSSI
MIXER
QUAD
OSCILLATOR
–
+
+
–
V
REG
AUDIO
E
B
1
2
3
4
5
6
7
8
9
10
SR00515
Figure 2. Block Diagram
6–129
1993 Dec 15
853-1726 11659