SA614AD ,Low power FM IF systemPIN CONFIGURATIONThe SA614A is an improved monolithic low-power FM IF systemD and N Packagesincorpo ..
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SA614AD
Low power FM IF system
Philips Semiconductors
Product specification
Replaces data of December 15, 1994 1997 Nov 07
IC17 Data Handbook
Philips Semiconductors Product specification
SA614ALow power FM IF system
DESCRIPTIONThe SA614A is an improved monolithic low-power FM IF system
incorporating two limiting intermediate frequency amplifiers,
quadrature detector, muting, logarithmic received signal strength
indicator, and voltage regulator. The SA614A features higher IF
bandwidth (25MHz) and temperature compensated RSSI and
limiters permitting higher performance application compared with the
SA604. The SA614A is available in a 16-lead dual-in-line plastic
and 16-lead SO (surface-mounted miniature) package.
FEATURES Low power consumption: 3.3mA typical 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 filters Excellent sensitivity: 1.5μV across input pins (0.22μV into 50Ω
matching network) for 12dB SINAD (Signal to Noise and Distortion
ratio) at 455kHz SA614A meets cellular radio specifications
PIN CONFIGURATION
Figure 1. Pin Configuration
APPLICATIONS Cellular radio FM IF High performance communications receivers Intermediate frequency amplification and detection up to 25MHz RF level meter Spectrum analyzer Instrumentation FSK and ASK data receivers
ORDERING INFORMATION
Philips Semiconductors Product specification
SA614ALow power FM IF system
BLOCK DIAGRAM
Figure 2. Block Diagram
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS VCC = +6V, TA = 25°C; unless otherwise stated.
Philips Semiconductors Product specification
SA614ALow power FM IF system
AC ELECTRICAL CHARACTERISTICSTypical reading at TA = 25°C; VCC = +6V, unless otherwise stated. IF frequency = 455kHz; IF level = -47dBm; FM modulation = 1kHz with
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: SA614A data sheets refer to power at 50Ω input termination; about 21dB less power actually enters the internal 1.5k input.
SA614A (50) SA614A (1.5k)/SA615 (1.5k)
-97dBm -118dBm
-47dBm -68dBm
+3dBm -18dBm
The SA615 and SA614A are both derived from the same basic die. The SA615 performance plots are directly applicable to the SA614A.
Philips Semiconductors Product specification
SA614ALow power FM IF system
Philips Semiconductors Product specification
SA614ALow power FM IF system
Figure 4. Equivalent Circuit
Philips Semiconductors Product specification
SA614ALow power FM IF system
Figure 5. Typical Application Cellular Radio (45MHz to 455kHz)
CIRCUIT DESCRIPTIONThe SA614A is a very high gain, high frequency device. Correct
operation is not possible if good RF layout and gain stage practices
are not used. The SA614A cannot be evaluated independent of
circuit, components, and board layout. A physical layout which
correlates to the electrical limits is shown in Figure 3. This
configuration can be used as the basis for production layout.
The SA614A is an IF signal processing system suitable for IF
frequencies as high as 21.4MHz. The device consists of two limiting
amplifiers, quadrature detector, direct audio output, muted audio
output, and signal strength indicator (with log output characteristic).
The sub-systems are shown in Figure 4. A typical application with
45MHz input and 455kHz IF is shown in Figure 5.
IF AmplifiersThe IF amplifier section consists of two log-limiting stages. The first
consists of two differential amplifiers with 39dB of gain and a small
small signal AC bandwidth of 28MHz. The outputs of the final
differential stage are buffered to the internal quadrature detector.
One of the outputs is available at Pin 9 to drive an external
quadrature capacitor and L/C quadrature tank.
Both of the limiting amplifier stages are DC biased using feedback.
The buffered output of the final differential amplifier is fed back to the
input through 42kΩ resistors. As shown in Figure 4, the input
impedance is established for each stage by tapping one of the
feedback resistors 1.6kΩ from the input. This requires one
additional decoupling capacitor from the tap point to ground.
