AD9122BCPZ

Overview

The AD9122BCPZ is a dual, 16-bit, high dynamic range digital-to-analog converter (DAC) from Analog Devices. It operates at a maximum sample rate of 1230 MSPS and utilizes TxDAC+ architecture. The device features integrated 2×/4×/8× interpolators and a complex modulator for direct conversion transmit applications. Key electrical parameters include a full-scale output current range of 8.7 mA to 31.7 mA, an internal reference voltage of 1.2 V, and power supply requirements of AVDD33 (3.13 V to 3.47 V), DVDD18/CVDD18 (1.71 V to 1.89 V). It is housed in a 72-lead LFCSP package with an exposed paddle.

Feature Summary

• Dual-channel 16-bit DAC with 1230 MSPS maximum sampling rate
• Integrated 2×/4×/8× interpolation filters and 32-bit complex NCO
• Flexible LVDS interface supporting word, byte, or nibble load modes
• Adjustable analog output current from 8.7 mA to 31.7 mA

Applications

• Wireless infrastructure (W-CDMA, CDMA2000, TD-SCDMA, WiMAX, GSM, LTE)
• Digital high or low intermediate frequency (IF) synthesis
• Transmit diversity systems
• Wideband communications (LMDS/MMDS, point-to-point)

Procurement Notes

Verify the specific silicon revision (R1 or R2) via device marking before procurement, as register maps and IOVDD ranges differ between revisions. Ensure the ordering suffix matches the required packaging format; the BC designation indicates the standard commercial temperature grade. Confirm compatibility with companion products such as ADL537x IQ modulators if designing a complete signal chain.

Selection Notes

Select this component for applications requiring high linearity and low noise spectral density up to Nyquist frequencies. Consider the IOVDD voltage range when choosing between revisions: R1 supports 1.8 V to 2.5 V, while R2 supports 1.8 V to 3.3 V. Evaluate power consumption against thermal constraints, noting that power dissipation varies significantly based on the selected interpolation mode and data rate.

Part Context

The AD9122 belongs to the TxDAC+ family of high-speed DACs designed for direct RF synthesis. It serves as a core component in modern wireless base stations and test equipment. The device is often paired with clock drivers like the AD9516 and IQ modulators from the ADL537x series to form complete transmitter chains.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.