SA607DK ,Low-voltage high performance mixer FM IF systemPin Configuration• Low power consumption: 3.5mA typical at 3V• Buffered frequency check output• Mi ..
SA607DK ,Low-voltage high performance mixer FM IF systemapplications (NAMPS/NTACS)• Low external component count; suitable for crystal/ceramic/LC• RF level ..
SA607DK ,Low-voltage high performance mixer FM IF systemapplications (NAMPS/NTACS)• Low external component count; suitable for crystal/ceramic/LC• RF level ..
SA608DK ,Low voltage high performance mixer FM IF systemFEATURES• RF level meter• Low power consumption: 3.5mA typical at• Spectrum analyzer3V• Instrument ..
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SA607DK
Low-voltage high performance mixer FM IF system
Philips Semiconductors
Product specification
Replaces data of November 3, 1992 1997 Nov 07
IC17 Data Handbook
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
DESCRIPTIONThe SA607 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 SA607 is available in 20-lead SOL
(surface-mounted miniature package) and 20-lead SSOP package.
The SA607 was designed for portable communication applications
and will function down to 2.7V. The RF section is similar to the
famous SA605. The audio output has an internal amplifier with the
feedback pin accessible. The RSSI output is buffered. The SA607
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.
FEATURES Low power consumption: 3.5mA typical at 3V Mixer input to >150MHz Mixer conversion power gain of 17dB at 45MHz XTAL oscillator effective to 150MHz (L.C. oscillator or external
oscillator can be used at higher frequencies) 102dB of IF Amp/Limiter gain 2MHz limiter small signal bandwidth Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a 90dB dynamic range Low external component count; suitable for crystal/ceramic/LC
filters Excellent sensitivity: 0.31μV into 50Ω matching network for 12dB
SINAD (Signal to Noise and Distortion ratio) for 1kHz tone, 8kHz
deviation with RF at 45MHz and IF at 455kHz SA607 meets cellular radio specifications Audio output internal op amp RSSI output internal op amp
PIN CONFIGURATION
Figure 1. Pin Configuration Buffered frequency check output Internal op amps with rail-to-rail outputs ESD protection: Human Body Model 2kV
Robot Model 200V
APPLICATIONS Portable cellular radio FM IF Cordless phones Narrow band cellular applications (NAMPS/NTACS) RF level meter Spectrum analyzer Instrumentation FSK and ASK data receivers Log amps Portable high performance communication receivers Single conversion VHF receivers Wireless systems
ORDERING INFORMATION
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
BLOCK DIAGRAM
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICSVCC = +3V, TA = 25°C; unless otherwise stated.
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
AC ELECTRICAL CHARACTERISTICSTA = 25°C; VCC = +3V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 2.4k; R18
= 3.3k; RF level = –45dBm; FM modulation = 1kHz with ±8kHz peak deviation. Audio output with de-emphasis filter and C-message weighted
filter. Test circuit 3. The parameters listed below are tested using automatic test equipment to assure consistent electrical characterristics. The
limits do not represent the ultimate performance limits of the device. Use of an optimized RF layout will improve many of the listed parameters.
NOTE: The generator source impedance is 50Ω, but the SA607 input impedance at Pin 18 is 1500Ω. As a result, IF level refers to the actual signal
that enters the SA607 input (Pin 18) which is about 21dB less than the “available power” at the generator.
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
CIRCUIT DESCRIPTIONThe SA607 is an IF signal processing system suitable for second IF
systems with input frequency as high as 150MHz. The bandwidth of
the IF amplifier and limiter is at least 2MHz with 90dB of gain. The
gain/bandwidth distribution is optimized for 455kHz, 1.5kΩ source
applications. The overall system is well-suited to battery operation
as well as high performance and high quality products of all types.
The input stage is a Gilbert cell mixer with oscillator. Typical mixer
characteristics include a noise figure of 6.2dB, conversion gain of
17dB, and input third-order intercept of –9dBm. The oscillator will
operate in excess of 200MHz in L/C tank configurations. Hartley or
Colpitts circuits can be used up to 100MHz for xtal configurations.
Butler oscillators are recommended for xtal configurations up to
150MHz.
The output impedance of the mixer is a 1.5kΩ resistor permitting
direct connection to a 455kHz ceramic filter. The input resistance of
the limiting IF amplifiers is also 1.5kΩ. With most 455kHz ceramic
filters and many crystal filters, no impedance matching network is
necessary. The IF amplifier has 43dB of gain and 5.5MHz
bandwidth. The IF limiter has 60dB of gain and 4.5MHz bandwidth.
To achieve optimum linearity of the log signal strength indicator,
there must be a 12dB(v) insertion loss between the first and second
IF stages. If the IF filter or interstage network does not cause
12dB(v) insertion loss, a fixed or variable resistor or an L pad for
simultaneous loss and impedance matching can be added between
the first IF output (Pin 16) and the interstage network. The overall
gain will then be 90dB with 2MHz bandwidth.
The signal from the second limiting amplifier goes to a Gilbert cell
quadrature detector. One port of the Gilbert cell is internally driven
by the IF. The other output of the IF is AC-coupled to a tuned
quadrature network. This signal, which now has a 90° phase
relationship to the internal signal, drives the other port of the
multiplier cell.
The demodulated output of the quadrature drives an internal op
amp. This op amp can be configured as a unity gain buffer, or for
simultaneous gain, filtering, and 2nd-order temperature
compensation if needed. It can drive an AC load as low as 5kΩ with
a rail-to-rail output.
A log signal strength completes the circuitry. The output range is
greater than 90dB and is temperature compensated. This log signal
strength indicator exceeds the criteria for AMPs or TACs cellular
telephone. This signal is buffered through an internal unity gain op
amp. The frequency check pin provides a buffered limiter output.
This is useful for implementing an AFC (Automatic Frequency
Check) function. This same output can also be used in conjunction
with limiter output (Pin 11) for demodulating FSK (Frequency Shift
Keying) data. Both pins are of the same amplitude, but 180° out of
phase.
NOTE: Limiter output or Frequency Check output has drive
capability of a load minimum of 2kΩ or higher to obtain 115mV
output level.
NOTE: dB(v) = 20log VOUT/VIN
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
Figure 5. SA607 Application Circuit Test Set Up
NOTES: 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 HP339 analyzer. The de-emphasis filter has a fixed -6dB/Octave slope
between 300Hz and 3kHz. 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 of our specifications and testing are done with the more wideband filter. 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. Sensitivity: The measured typical sensitivity for 12dB SINAD should be 0.35μV or –116dBm at the RF input. Layout: The layout is very critical in the performance of the receiver. We highly recommend our demo board layout. 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. 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. 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.
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
Figure 6. ICC vs Temperature
Figure 7. Third Order Intercept Point vs Supply Voltage
Philips Semiconductors Product specification
SA607Low voltage high performance mixer FM IF system
Figure 8. Mixer Noise Figure vs Supply Voltage
Figure 9. Conversion Gain vs Supply Voltage
