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MAX2023ETX+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX2023ETX+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 18 page High-Dynamic-Range, Direct Up-/Downconversion 1500MHz to 2500MHz Quadrature Mod/Demod 10 Detailed Description The MAX2023 is designed for upconverting differential in-phase (I) and quadrature (Q) inputs from baseband to a 1500MHz to 2500MHz RF frequency range. The device can also be used as a demodulator, downcon- verting an RF input signal directly to baseband. Applications include single and multicarrier 1500MHz to 2500MHz DCS/PCS EDGE, WCDMA/LTE/TD-LTE, cdma2000, and PHS/PAS base stations. Direct conver- sion architectures are advantageous since they signifi- cantly reduce transmitter or receiver cost, part count, and power consumption as compared to traditional IF-based double-conversion systems. The MAX2023 integrates internal baluns, an LO buffer, a phase splitter, two LO driver amplifiers, two matched double-balanced passive mixers, and a wideband quad- rature combiner. The MAX2023’s high-linearity mixers, in conjunction with the part’s precise in-phase and quadra- ture channel matching, enable the device to possess excellent dynamic range, ACLR, 1dB compression point, and LO and sideband suppression characteristics. These features make the MAX2023 ideal for single-carrier GSM and multicarrier WCDMA/LTE/TD-LTE operation. LO Input Balun, LO Buffer, and Phase Splitter The MAX2023 requires a single-ended LO input, with a nominal power of 0dBm. An internal low-loss balun at the LO input converts the single-ended LO signal to a differential signal at the LO buffer input. In addition, the internal balun matches the buffer’s input impedance to 50 Ω over the entire band of operation. The output of the LO buffer goes through a phase split- ter, which generates a second LO signal that is shifted by 90° with respect to the original. The 0° and 90° LO signals drive the I and Q mixers, respectively. LO Driver Following the phase splitter, the 0° and 90° LO signals are each amplified by a two-stage amplifier to drive the I and Q mixers. The amplifier boosts the level of the LO signals to compensate for any changes in LO drive lev- els. The two-stage LO amplifier allows a wide input power range for the LO drive. The MAX2023 can toler- ate LO level swings from -3dBm to +3dBm. Pin Description PIN NAME FUNCTION 1, 5, 9–12, 14, 16–19, 22, 24, 27–30, 32, 34, 35, 36 GND Ground 2 RBIASLO3 3rd LO Amplifier Bias. Connect a 301 resistor to ground. 3 VCCLOA LO Input Buffer Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF capacitors as close as possible to the pin. 4 LO Local Oscillator Input. 50 input impedance. Requires a DC-blocking capacitor. 6 RBIASLO1 1st LO Input Buffer Amplifier Bias. Connect a 432 resistor to ground. 7 N.C. No Connection. Leave unconnected. 8 RBIASLO2 2nd LO Amplifier Bias. Connect a 562 resistor to ground. 13 VCCLOI1 I-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF capacitors as close as possible to the pin. 15 VCCLOI2 I-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF capacitors as close as possible to the pin. 20 BBI+ Baseband In-Phase Noninverting Port 21 BBI- Baseband In-Phase Inverting Port 23 RF RF Port. This port is matched to 50 . Requires a DC-blocking capacitor. 25 BBQ- Baseband Quadrature Inverting Port 26 BBQ+ Baseband Quadrature Noninverting Port 31 VCCLOQ2 Q-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF capacitors as close as possible to the pin. 33 VCCLOQ1 Q-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 22pF and 0.1μF capacitors as close as possible to the pin. EP GND Exposed Ground Pad. The exposed pad MUST be soldered to the ground plane using multiple vias. |
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