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
RF IN+ 1
20 MIXER OUT
19 IF AMP DECOUPLING
RF IN– DECOUPLING 2
18 IF AMP IN
OSCOUT 3
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.
17 IF AMP DECOUPLING
OSCIN 4
16 IF AMP OUT
RSSI OUT 5
VCC 6
15 GND
14 LIMITER IN
AUDIO FEEDBACK 7
AUDIO OUT 8
13 LIMITER DECOUPLING
RSSI FEEDBACK 9
12 LIMITER DECOUPLING
QUADRATURE IN 10
11
FEATURES
• Low power consumption: 3.5mA typical at 3V
• Mixer input to >100MHz
• Mixer conversion power gain of 17dB at 45MHz
• XTAL oscillator effective to 100MHz (L.C. oscillator or external
LIMITER OUT
SR00514
Figure 1. Pin Configuration
• Audio output internal op amp
• RSSI output internal op amp
• Internal op amps with rail-to-rail outputs
• ESD protection: Human Body Model 2kV
oscillator can be used at higher frequencies)
• 102dB of IF Amp/Limiter gain
• 2MHz IF amp/limiter small signal bandwidth
• 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
filters
• Cordless phones
ORDERING INFORMATION
DESCRIPTION
TEMPERATURE RANGE
ORDER CODE
DWG #
-40 to +85°C
SA676DK
SOT266-1
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
BLOCK DIAGRAM
20
19
18
17
16
15
14
IF
AMP
13
12
11
LIMITER
RSSI
MIXER
QUAD
OSCILLATOR
– +
+ –
VREG
E
1
2
3
4
AUDIO
B
5
6
7
8
9
10
SR00515
Figure 2. Block Diagram
1993 Dec 15
6–129
853-1726 11659
