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Philips - Low-voltage mixer FM IF system

Numéro de référence SA676DK
Description Low-voltage mixer FM IF system
Fabricant Philips 
Logo Philips 





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SA676DK fiche technique
Philips Semiconductors
Low-voltage mixer FM IF system
Product specification
SA676
DESCRIPTION
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).
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.
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
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
Indicator (RSSI) with a 70dB dynamic range
Low external component count; suitable for crystal/ceramic/LC
filters
PIN CONFIGURATION
DK Package
RF IN+ 1
RF IN– DECOUPLING 2
OSCOUT 3
OSCIN 4
RSSI OUT 5
VCC 6
AUDIO FEEDBACK 7
AUDIO OUT 8
RSSI FEEDBACK 9
QUADRATURE IN 10
20 MIXER OUT
19 IF AMP DECOUPLING
18 IF AMP IN
17 IF AMP DECOUPLING
16 IF AMP OUT
15 GND
14 LIMITER IN
13 LIMITER DECOUPLING
12 LIMITER DECOUPLING
11 LIMITER OUT
Figure 1. Pin Configuration
SR00514
Audio output internal op amp
RSSI output internal op amp
Internal op amps with rail-to-rail outputs
ESD protection: Human Body Model 2kV
Robot Model 200V
APPLICATION
Cordless phones
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Shrink Small Outline Package (Surface-mount)
TEMPERATURE RANGE
-40 to +85°C
ORDER CODE
SA676DK
DWG #
SOT266-1
BLOCK DIAGRAM
20 19 18 17 16 15 14 13 12 11
MIXER
IF
AMP
OSCILLATOR
RSSI
LIMITER
QUAD
+–
VREG
–+
EB
AUDIO
123 456 789
Figure 2. Block Diagram
10
SR00515
1993 Dec 15
6–129
853-1726 11659

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