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SA605D-SA605DK
High performance low power mixer FM IF system
Philips Semiconductors
Product specification
Replaces data of November 3, 1992 1997 Nov 07
RF Communications Handbook
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
DESCRIPTIONThe SA605 is a high performance monolithic low-power FM IF
system incorporating a mixer/oscillator, two limiting intermediate
frequency amplifiers, quadrature detector, muting, logarithmic
received signal strength indicator (RSSI), and voltage regulator. The
SA605 combines the functions of Signetics’ SA602 and SA604A, but
features a higher mixer input intercept point, higher IF bandwidth
(25MHz) and temperature compensated RSSI and limiters
permitting higher performance application. The SA605 is available
in 20-lead dual-in-line plastic, 20-lead SOL (surface-mounted
miniature package) and 20-lead SSOP (shrink small outline
package).
The SA605 and SA615 are functionally the same device types. The
difference between the two devices lies in the guaranteed
specifications. The SA615 has a higher ICC, lower input third order
intercept point, lower conversion mixer gain, lower limiter gain, lower
AM rejection, lower SINAD, higher THD, and higher RSSI error than
the SA605. Both the SA605 and SA615 devices will meet the EIA
specifications for AMPS and TACS cellular radio applications.
For additional technical information please refer to application notes
AN1994, 1995 and 1996, which include example application
diagrams, a complete overview of the product, and artwork for
reference.
APPLICATIONS Cellular radio FM IF High performance communications receivers Single conversion VHF/UHF receivers SCA receivers RF level meter Spectrum analyzer Instrumentation FSK and ASK data receivers Log amps Wideband low current amplification
PIN CONFIGURATION
Figure 1. Pin Configuration
FEATURES Low power consumption: 5.7mA typical at 6V Mixer input to >500MHz Mixer conversion power gain of 13dB at 45MHz Mixer noise figure of 4.6dB at 45MHz XTAL oscillator effective to 150MHz (L.C. oscillator to 1GHz local
oscillator can be injected) 102dB of IF Amp/Limiter gain 25MHz limiter small signal bandwidth Temperature compensated logarithmic Received Signal Strength
Indicator (RSSI) with a dynamic range in excess of 90dB Two audio outputs - muted and unmuted Low external component count; suitable for crystal/ceramic/LC
filters Excellent sensitivity: 0.22μV into 50Ω matching network for 12dB
SINAD (Signal to Noise and Distortion ratio) for 1kHz tone with RF
at 45MHz and IF at 455kHz SA605 meets cellular radio specifications ESD hardened
ORDERING INFORMATION
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
BLOCK DIAGRAM
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICSVCC = +6V, TA = 25°C; unless otherwise stated.
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
AC ELECTRICAL CHARACTERISTICSTA = 25°C; VCC = +6V, unless otherwise stated. RF frequency = 45MHz + 14.5dBV RF input step-up; IF frequency = 455kHz; R17 = 5.1k; RF
level = -45dBm; FM modulation = 1kHz with ±8kHz peak deviation. Audio output with C-message weighted filter and de-emphasis capacitor.
Test circuit Figure 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 SA605 input impedance at Pin 18 is 1500Ω. As a result, IF level refers to the actual signal
that enters the SA605 input (Pin 8) which is about 21dB less than the ”available power” at the generator.
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
CIRCUIT DESCRIPTIONThe SA605 is an IF signal processing system suitable for second IF
or single conversion systems with input frequency as high as 1GHz.
The bandwidth of the IF amplifier is about 40MHz, with 39.7dB(v) of
gain from a 50Ω source. The bandwidth of the limiter is about
28MHz with about 62.5dB(v) of gain from a 50Ω source. However,
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 5dB, conversion gain of
13dB, and input third-order intercept of -10dBm. The oscillator will
operate in excess of 1GHz 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 of the mixer is internally loaded with 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. 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 can be added between the first IF output (Pin 16) and the
interstage network.
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.
Overall, the IF section has a gain of 90dB. For operation at
intermediate frequencies greater than 455kHz, special care must be
given to layout, termination, and interstage loss to avoid instability.
The demodulated output of the quadrature detector is available at
two pins, one continuous and one with a mute switch. Signal
attenuation with the mute activated is greater than 60dB. The mute
input is very high impedance and is compatible with CMOS or TTL
levels.
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.
NOTE: dB(v) = 20log VOUT/VIN
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
Philips Semiconductors Product specification
SA605High performance low power mixer FM IF system
