W3030 3 V Dual-Mode IF Cellular Receiver

Data Sheet April 1999 W3030 3 V Dual-Mode IF Cellular Receiver Features n n n 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 n n n Applications n n IS-136 (North American dual-mode) cellular radio portable and mobile terminals Cellular radio base stations Digital satellite communications Multisymbol signaling receivers n n n n 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 2 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. 3 W3030 3 V Dual-Mode IF Cellular Receiver Data Sheet April 1999 Description (continued) IFDACG GND2 IFDIN IFDIN VCM AGC I 32 1 FM DEMOD & RSSI 2 31 30 29 28 27 26 I 25 24 RSSI 50 kΩ CLK AUDIO ÷4 2 kΩ 48 kΩ 23 Q QUAD 3 49 kΩ 22 AGC AMP I/Q DEMODULATOR 21 50 kΩ Q IFAOUT 4 ANALOG SECOND IF LIMITER ENBA IFAACG 5 1 kΩ 20 FIRST IF MIXER/AMPLIFIER 10 MHz—1000 MHz 19 ENBD IFAIN 6 IF1IN IFAIN 7 50 kΩ SECOND IF AMP 0.2 MHz—2.0 MHz 18 IF1IN VCC2 8 17 VCC1 1 kΩ 48 kΩ 2 kΩ 1 kΩ 9 10 11 12 13 14 15 16 IF2ACG IF2IN IF2IN IF2OUT GND1 IF1OUT IF1LO Figure 2. Detailed Block Diagram with Pinout 4 IF1LO Lucent Technologies Inc. Data Sheet April 1999 W3030 3 V Dual-Mode IF Cellular Receiver Pin Information Table 1. Pin Descriptions Pin Number 1 2 3 4 5 6 Pin Name RSSI AUDIO QUAD IFAOUT IFAACG IFAIN Pin Description Received Signal Strength Indicator. Provides logarithmic (dB-linear) dc output voltage. Audio Output. Audio output of FM detector. Quad Input. Input to FM detector from parallel LC quad coil. Analog Output. Output of analog section limiting amplifiers; couple to quad coil and pin 3 (QUAD) with 10 pF capacitor. Analog Signal Ground. Signal ground for analog section limiting amplifier; connect to ground with 0.1 µF capacitor. Analog Mode Limiter Input. Differential input to analog IF limiting amplifier; to be directly coupled to dielectric sources such as ceramic filters. Pin 6 is approximately 1 kΩ with pin 5 ac-grounded. Analog Mode Limiter Input (Inverting). Differential input to analog IF limiting amplifier. To be ac-grounded. Second IF Power Supply. Positive power supply connection for both analog and digital second IF amplifiers and demodulators. Second IF Output. Output of 40 dB second IF amplifier; directly couple to dielectric loads such as ceramic filters. Includes internal 1 kΩ termination resistor. Second IF Signal Ground. Signal ground for 40 dB second IF amplifier; connect to ground with 0.1 µF capacitor. Second IF Input. Differential input to 40 dB second IF amplifier; to be directly coupled to dielectric sources such as ceramic filters. Pin 11 is approximately 2 kΩ with pin 10 ac-grounded. Second IF Input (Inverting). Differential input to 40 dB second IF amplifier. To be ac-grounded. First IF Mixer Ground. Power supply (dc) ground for first IF mixer section. First IF Mixer Output. Output of first IF mixer/amplifier section; to be directly coupled to dielectric loads such as ceramic filters. Includes internal 1 kΩ termination resistor. First IF Mixer Logical Input (Inverting). Differential input to first IF mixer local oscillator; to be capacitively coupled to sources with a dc level offset. First IF Mixer Logical Input. Differential input to first IF mixer local oscillator. To be ac-grounded. First IF Mixer Power Supply. Positive power supply connection for first IF mixer/amplifier section. First IF Mixer Input (Inverting). Differential input to first IF mixer/amplifier section; to be ac-coupled to ground or source. First IF Mixer Input. Differential input to first IF mixer/amplifier section. 7 8 9 IFA IN VCC2 IF2OUT 10 11 IF2ACG IF2IN 12 13 14 IF2 IN GND1 IF1OUT 15 16 17 18 19 IF1 LO IF1LO VCC1 IF1 IN IF1IN Lucent Technologies Inc. 5 W3030 3 V Dual-Mode IF Cellular Receiver Data Sheet April 1999 Pin Information (continued) Table 1. Pin Descriptions (continued) Pin Number 20 21 22 23 24 Pin Name ENBD ENBA Q Q CLK Pin Description Enable Digital Mode. Positive logic enable connection for digital mode operation. Enable Analog Mode. Positive logic enable connection for analog