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MAX2312 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX2312 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 22 page CDMA IF VGAs and I/Q Demodulators with VCO and Synthesizer 8 _______________________________________________________________________________________ _______________Detailed Description MAX2310 The MAX2310 is intended for dual-band (PCS and cel- lular) and dual-mode code division multiple access (CDMA) and FM applications (Figure 1). The device includes an IF variable-gain amplifier, quadrature demodulator, dual VCOs, and dual-frequency synthe- sizers (Figure 7). Dual VCOs are provided for applica- tions using different IF frequencies for each mode or band of operation. The analog FM output signal can be configured for conversion to the I channel, or it may be converted in quadrature to both the I and Q channels. The MAX2310’s operation modes are described in Table 1. These modes are set by programming the con- trol register and setting logic levels on control pins. If MODE is left floating, the internal register controls the operation. If driven high or low, mode will override cer- tain register bits, as shown in Table 1. MAX2310 BYP BYP FM- FM+ CDMA+ CDMA FM 3-WIRE DAC 0.1 μF 0.01 μF 0.033 μF 47pF 5pF 18pF 3.3nF 10k Ω 10k Ω 10k Ω 18pF 47pF 68nH 0.01 μF 680 Ω CDMA- LOCK VGC VCC VCC VCC VCC DATA CLK QOUT+ QOUT- EN TANKH- IOUT- IOUT+ REF GND VCC MODE TANKH+ TANKL- GND CPOUT BYP SHDN TANKL+ 0.01 μF VCC 47pF 10k Ω 47k Ω Q I 10k Ω 1.5pF 12pF 10k Ω 10k Ω 12pF 18nH Figure 1. MAX2310 Typical Operating Circuit |
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