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Details, datasheet, quote on part number:W3030
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Datasheet text preview:
Data Sheet April 1999
W3030 3 V Dual-Mode IF Cellular Receiver
Features
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Low supply current Analog received signal strength indicator (RSSI) available Analog AGC for digital-mode IF amplifiers Over 100 dB combined voltage gain
Proven double conversion architecture: First IF capability: 10 MHz to over 1000 MHz Second IF capability: 0.2 MHz to 2.0 MHz Dual second IF amplifiers and demodulators: Analog-mode limiting amplifier and FM quadrature detector Digital-mode linear AGC amplifiers with dual-mixer I & Q quadrature demodulator Accurate, onboard local oscillator phase splitter for digital quadrature demodulator Four enable/powerdown modes, selectable from two digital control pins, allow operation with minimal supply current
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Applications
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IS-136 (North American dual-mode) cellular radio portable and mobile terminals Cellular radio base stations Digital satellite communications Multisymbol signaling receivers
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DIGITAL SECTION VCC GND ENBA ENBD VCM AGC LOGIC AND BIAS CONTROL VARIABLE GAIN ÷4
I
CLK
Q
IF INPUT
ANALOG SECTION
AUDIO RSSI
LO
Figure 1. General Block Diagram
W3030 3 V Dual-Mode IF Cellular Receiver
Data Sheet April 1999
Table of Contents
Features...... 1 Applications ...... 1 Description ........ 3 Pin Information...........5 Absolute Maximum Ratings..........7 Handling Precautions .......... 7 Operating Ranges ...... 8 Electrical Specifications ...... 8 RSSI ......... 11 Quadrature Detector..........11 Quad Tank S-Curves ..... 12 Test Circuit Diagram ......... 14 Characteristic Curves........15 Outline Diagram.......20 32-Pin TQFP............20 Manufacturing Information ...... 21 Ordering Information ......... 21
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Lucent Technologies Inc.
Data Sheet April 1999
W3030 3 V Dual-Mode IF Cellular Receiver
parallel amplifier/demodulator sections. In the analog second IF, there is a 40 dB amplifier followed by a 60 dB hard-limiting amplifier and an FM quadrature detector (noncoherent discriminator). The signal path between the 40 dB and 60 dB amplifier stages is brought off-chip for external filtering purposes. In digital mode, an AGC amplifier provides gain between 10 dB and 80 dB. The digital signal is demodulated in double-balanced mixers that are fed with an external local oscillator (LO) signal. The external LO passes through a divide-by-four counter to provide the final IF LO frequency. This architecture greatly reduces the possibility of feedback of the external LO signal to the IF input, which would cause dc offsets at the I & Q outputs. This circuit also provides a 90° phase shift of the LO that is independent of duty cycle. The resulting I & Q differential pairs can be level-shifted using the VCM input pin, providing flexibility in interfacing to digital processing ICs. A pair of logic inputs allows the device to be put into a powerdown mode and one of two partially enabled modes (analog or digital only), or a fully enabled mode, allowing the use of analog RSSI while in digital receive mode.
Description
The W3030 is a monolithic integrated circuit that provides most of the receive path functions required to meet the IS-136 (and IS-54) standard. The W3030 converts FM or digitally modulated IF carriers up to 200 MHz and provides required IF gain and separate baseband detectors for the two modulation modes. The W3030 is organized into three subfunctions (see Figure 2): 1. First IF mixer/amplifier 2. Analog second IF 3. Digital second IF sections (Note that the electrical specification tables correspond to each subfunction.) Each section has a buffered output to allow for external filtering, which also provides flexibility in system architecture selection. The first IF mixer section provides 30 dB of fixed voltage conversion gain (power gain = 17 dB). The first IF mixer also performs down-conversion to the 0.2 MHz--2.0 MHz range, which allows the use of inexpensive ceramic filters at two points in the signal path. In the second IF section, the signal path may be split between two
Lucent Technologies Inc.
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