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MAX2312EEI Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX2312EEI Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 22 page CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer _______________________________________________________________________________________ 7 Pin Description (continued) 27, 28 27, 28 Bypass Node. Must be capacitively decoupled (bypassed) to analog VCC. BYP 27, 28 27, 28 23, 24 23, 24 Differential CDMA Input. Active in CDMA mode. CDMA-, CDMA+ 23, 24 23, 24 25 — Differential Positive Input. Active in FM mode. FM+ 25 — 22 22 VGA Gain Control Input. Control voltage range is 0.5V to 2.3V. VGC 22 22 20 20 Data input of the 3-wire serial bus. DATA 20 20 19 19 Enable Input. When low, input shift register is enabled. EN 19 19 18 18 Clock input of the 3-wire serial bus CLK 18 18 16, 17 16, 17 Differential Quadrature-Phase Baseband Output. Disabled if FM_I mode is selected. QOUT-, QOUT+ 16, 17 16, 17 15 15 Lock Output—open-collector pin. Logic high indicates phase- locked condition. LOCK 15 15 13, 14 13, 14 Differential In-Phase Baseband Output, or FM signal output FM_I mode is selected. IOUT+, IOUT- 13, 14 13, 14 12 12 Shutdown Input—active low. Low powers down entire device, including registers and serial interface. SHDN 12 12 11 11 Reference Frequency Input REF 11 11 — 8 Internal VCO Output. Depending on setting of BD bit, LOOUT is either the VCO frequency (twice the IF frequency) or one- half the VCO frequency (equal to the IF frequency). LOOUT — 8 6, 7 5, 6 Differential Tank Input for High-Frequency Oscillator TANKH+, TANKH- — — NAME FUNCTION PIN MAX2310 MAX2312 MAX2314 MAX2316 — 7 LO Buffer Amplifier—active low BUFEN — 7 — — No Connection. Must be left open-circuit. N.C. 6, 7 — 8 — Mode Select. High selects CDMA mode; low selects FM mode. MODE — — 10 10 Digital Ground GND 10 10 9 9 +2.7V to +5.5V Supply for Digital Circuits VCC 9 9 21 21 2.7V to 5.5V Supply for Analog Circuits VCC 21 21 26 — Differential Negative Input for FM signal. Bypass to GND for single-ended operation. FM- 26 — — 26 Standby Input—active low. Low powers down VGA and demod- ulator while keeping VCO, PLL, and serial bus on. STBY — 26 — 25 No Connection. N.C. — 25 |
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