Philips Semiconductors RF Communications Products
Product specification
Low voltage high performance mixer FM IF system
SA608
DESCRIPTION
The SA608 is a low voltage high performance
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 SA608 is available in 20-lead
dual-in-line plastic, 20-lead SOL
(surface-mounted miniature package) and
20-lead SSOP package.
The SA608 was designed for portable
communication applications and will function
down to 2.7V. The RF section is similar to
the famous NE605. The audio output is
buffered. The RSSI output has an internal
amplifier with the feedback pin accessible.
The SA608 also has an extra limiter output.
This signal is buffered from the output of the
limiter and can be used to perform frequency
check. This is accomplished by comparing a
reference frequency with the frequency check
signal using a comparator to a varactor or
PLL at the oscillator inputs.
鈥?/div>
Low external component count; suitable for
crystal/ceramic/LC filters
PIN CONFIGURATION
D, DK and N Packages
鈥?/div>
Excellent sensitivity:
0.31碌V into 50鈩?/div>
matching network for 12dB SINAD (Signal
to Noise and Distortion ratio) for 1kHz tone,
8kHz deviation with RF at 45MHz and IF at
455kHz
RF IN+
1
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 (+)
RF IN鈥?2
DECOUPLING
OSC-
3
4
5
6
7
鈥?/div>
SA608 meets cellular radio specifications
鈥?/div>
Audio output internal op amp
鈥?/div>
RSSI output internal op amp
鈥?/div>
Buffered frequency check output
鈥?/div>
Internal op amps with rail-to-rail outputs
鈥?/div>
ESD protection: Human Body Model 2kV
Robot Model 200V
OUT
OSC
IN
RSSI
V
CC
AUDIO
RSSI 8
FEEDBACK
FREQ CHECK/ 9
LIM OUT (鈥?
QUADRATURE 10
IN
APPLICATIONS
鈥?/div>
Portable cellular radio FM IF
鈥?/div>
Cordless phones
鈥?/div>
Narrow band cellular applications
(NAMPS/NTACS)
FEATURES
3V
鈥?/div>
Low power consumption:
3.5mA typical at
鈥?/div>
Mixer input to >150MHz
鈥?/div>
Mixer conversion power gain of 17dB at
45MHz
鈥?/div>
XTAL oscillator effective to 150MHz (L.C.
oscillator or external oscillator can be used
at higher frequencies)
鈥?/div>
RF level meter
鈥?/div>
Spectrum analyzer
鈥?/div>
Instrumentation
鈥?/div>
FSK and ASK data receivers
鈥?/div>
Log amps
鈥?/div>
Portable high performance communication
receivers
鈥?/div>
102dB of IF Amp/Limiter gain
鈥?/div>
2MHz limiter small signal bandwidth
鈥?/div>
Temperature compensated logarithmic
Received Signal Strength Indicator (RSSI)
with a 90dB dynamic range
鈥?/div>
Single conversion VHF receivers
鈥?/div>
Wireless systems
ORDERING INFORMATION
DESCRIPTION
20-Pin Plastic Dual In-Line Package (DIP)
20-Pin Plastic Small Outline Large (SOL) package (Surface-mount)
20-Pin Plastic Shrink Small Outline Package (SSOP) (Surface-mount)
TEMPERATURE RANGE
-40 to +85擄C
-40 to +85擄C
-40 to +85擄C
ORDER CODE
SA608N
SA608D
SA608DK
DWG #
0408B
0172D
1563
November 3, 1992
2
853-1679 08108
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