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PDF SA676DK Data sheet ( Hoja de datos )
| Número de pieza | SA676DK | |
| Descripción | Low-voltage mixer FM IF system | |
| Fabricantes | Philips | |
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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
1 page  
Philips Semiconductors
Low-voltage mixer FM IF system
Product specification
SA676
RF GENERATOR
45MHz
VCC (+3)
SA676 DEMOBOARD
RSSI AUDIO
DC VOLTMETER
DE-EMPHASIS
FILTER
C–MESSAGE
SCOPE
HP339A DISTORTION
ANALYZER
Figure 4. SA676 Application Circuit Test Set Up
SR00517
NOTES:
1. C-message: The C-message and de-emphasis filter combination has a peak gain of 10 for accurate measurements. Without the gain, the
measurements may be affected by the noise of the scope and HP339A analyzer. The de-emphasis filter has a fixed -6dB/Octave slope
between 300Hz and 3kHz.
2. Ceramic filters: The ceramic filters can be 30kHz SFG455A3s made by Murata which have 30kHz IF bandwidth (they come in blue), or
16kHz CFU455Ds, also made by Murata (they come in black). All specifications and testing are done with the wideband filter.
3. RF generator: Set your RF generator at 45.000MHz, use a 1kHz modulation frequency and a 6kHz deviation if you use 16kHz filters, or
8kHz if you use 30kHz filters.
4. Sensitivity: The measured typical sensitivity for 12dB SINAD should be 0.45µV or –114dBm at the RF input.
5. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout.
6. RSSI: The smallest RSSI voltage (i.e., when no RF input is present and the input is terminated) is a measure of the quality of the layout and
design. If the lowest RSSI voltage is 500mV or higher, it means the receiver is in regenerative mode. In that case, the receiver sensitivity
will be worse than expected.
7. Supply bypass and shielding: All of the inductors, the quad tank, and their shield must be grounded. A 10-15µF or higher value tantalum
capacitor on the supply line is essential. A low frequency ESR screening test on this capacitor will ensure consistent good sensitivity in
production. A 0.1µF bypass capacitor on the supply pin, and grounded near the 44.545MHz oscillator improves sensitivity by 2-3dB.
8. R5 can be used to bias the oscillator transistor at a higher current for operation above 45MHz. Recommended value is 22kΩ, but should not
be below 10kΩ.
1993 Dec 15
6–133
5 Page | ||
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