SA676 Datasheet, PDF (1/8 Pages) NXP Semiconductors – Low-voltage mixer FM IF system

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
OSC_OUT 3
OSC_IN ⁴
RSSI OUT 5
V_CC 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
+–
–+
V_REG
E
B
AUDIO
1
2
3
4
5
6
7
8
9
10
Figure 2. Block Diagram
SR00515
1993 Dec 15
6–129
853-1726 11659