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MAX2424 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX2424 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page 900MHz Image-Reject Receiver with Transmit Mixer 8 _______________________________________________________________________________________ _________________________________________________Pin Description (continued) FUNCTION PIN NAME Transmit Bias Compensation Input. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND. Do not make any other connections to this pin. 14 Transmit Mixer’s Inverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input port. See Figure 1. 13 CAP2 TXIN Transmit Mixer’s Noninverting Baseband/IF Input. TXIN, TXIN form a high-impedance, differential input port. See Figure 1. 12 TXIN Prescaler/Oscillator Buffer Output. In divide-by-64/65 mode (DIV1 = low), the output level is 500mVp-p into a high-impedance load. In divide-by-1 mode (DIV1 = high), this output delivers -8dBm into a 50 Ω load. AC couple to this pin. 21 Ground connection for the Prescaler. Connect PREGND to ground for normal operation. Leave uncon- nected to disable the prescaler and the output buffer. Connect MOD and DIV1 to ground and leave PRE- OUT unconnected when disabling the prescaler. 20 PREOUT PREGND Modulus Control for the Divide-by-64/65 Prescaler. Drive MOD high for divide-by-64 mode. Drive MOD low for divide-by-65 mode. 19 Drive VCOON with a logic high to turn on the VCO, phase shifters, VCO buffers, and prescaler. To dis- able the prescaler, leave the PREGND pin unconnected. 17 Drive RXON and VCOON with a logic high to enable the LNA, receive mixer, and IF output buffer. See Power Management section. 16 MOD VCOON RXON Drive TXON and VCOON with a logic high to enable the transmit IF variable-gain amplifier, upconverter mixer, and PA predriver. See Power Management section. 15 TXON Drive DIV1 with a logic high to disable the divide-by-64/65 prescaler and connect the PREOUT pin directly to an oscillator buffer amplifier, which outputs -8dBm into a 50 Ω load. Drive DIV1 low for divide- by-64/65 operation. Drive this pin low when in shutdown to minimize shutdown current. 18 DIV1 Supply-Voltage Input for Prescaler. Bypass with a 47pF low-inductance capacitor and 0.01µF to GND (pin 20 recommended). 22 VCC Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using an external oscillator. 24 TANK Supply-Voltage Input for VCO and Phase Shifters. Bypass with a 47pF low-inductance capacitor to GND (pin 26 recommended). 23 VCC Differential Oscillator Tank Port. See Applications Information for information on tank circuits or on using an external oscillator. 25 TANK Ground Connection for VCO and Phase Shifters 26 GND Ground (substrate) 27 GND Ground Connection for Master Bias Cell 28 GND |
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