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MAX2021ETX+T Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX2021ETX+T Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 14 page High-Dynamic-Range, Direct Up-/Downconversion 750MHz to 1200MHz Quadrature Mod/Demod 8 _______________________________________________________________________________________ Detailed Description The MAX2021 is designed for upconverting differential in-phase (I) and quadrature (Q) inputs from baseband to a 750MHz to 1200MHz RF frequency range. The device can also be used as a demodulator, downcon- verting an RF input signal directly to baseband. Applications include RFID handheld and portal readers, as well as single and multicarrier GSM/EDGE, cdma2000, WCDMA, and iDEN base stations. Direct conversion architectures are advantageous since they significantly reduce transmitter or receiver cost, part count, and power consumption as compared to tradition- al IF-based double conversion systems. The MAX2021 integrates internal baluns, an LO buffer, a phase splitter, two LO driver amplifiers, two matched double-balanced passive mixers, and a wideband quadrature combiner. The MAX2021’s high-linearity mix- ers, in conjuction with the part’s precise in-phase and quadrature channel matching, enable the device to pos- sess excellent dynamic range, ACLR, 1dB compression point, and LO and sideband suppression characteris- tics. These features make the MAX2021 ideal for four- carrier WCDMA operation. LO Input Balun, LO Buffer, and Phase Splitter The MAX2021 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 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 332 Ω resistor to ground. 3 VCCLOA LO Input Buffer Amplifier Supply Voltage. Bypass to GND with 33pF and 0.1µF capacitors as close to the pin as possible. 4 LO Local Oscillator Input. 50 Ω input impedance. 6 RBIASLO1 1st LO Input Buffer Amplifier Bias. Connect a 432 Ω resistor to ground. 7 N.C. No Connection. Leave unconnected. 8 RBIASLO2 2nd LO Amplifier Bias. Connect a 619 Ω resistor to ground. 13 VCCLOI1 I-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 33pF and 0.1µF capacitors as close to the pin as possible. 15 VCCLOI2 I-Channel 2nd LO Amplifier Supply Voltage. Bypass to GND with 33pF and 0.1µF capacitors as close to the pin as possible. 20 BBI+ Baseband In-Phase Noninverting Port 21 BBI- Baseband In-Phase Inverting Port 23 RF RF Port 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 33pF and 0.1µF capacitors as close to the pin as possible. 33 VCCLOQ1 Q-Channel 1st LO Amplifier Supply Voltage. Bypass to GND with 33pF and 0.1µF capacitors as close to the pin as possible. EP GND Exposed Ground Paddle. The exposed paddle MUST be soldered to the ground plane using multiple vias. |
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