New DAC features 400-MHz bandwidth with on-chip numerically-controlled oscillator

New DAC features 400-MHz bandwidth with on-chip numerically-controlled oscillator

Analog Devices introduces a dual-channel, 1.2-GSPS 16-bit DAC supporting the high data rates and complex modulation schemes required for advanced multi-carrier wireless and broadband communications equipment throughout the world.

A key feature of the new AD9122 DAC is an on-chip 32-bit numerically-controlled oscillator (NCO), which provide frequency translation in the digital domain - an important block in modern digital radio processing. The NCO allows flexible placement of the IF (intermediate frequency) to help optimize system performance, enabling the AD9122 DAC to satisfy the requirements of multi-standard cellular base stations and other applications that use sophisticated digital pre-distortion (DPD) techniques demanding broad signal bandwidths. The wireless communications standards that the AD9122 supports include GSM, WCDMA, TD-SCDMA, CDMA2000, WiMAX, and LTE.

The AD9122 LVDS (low-voltage differential signaling) interface with an eight-word-deep FIFO (first-in, first-out) memory supports a maximum sample-data-input-rate of 1.2 GSPS and 600 MSPS (mega samples per second) per DAC to support signal bandwidths up to 400 MHz in advanced DPD transmitter architectures. The data interface supports word, byte, and nibble load allowing customers to reduce input pins on lower data rates to save board space, power and cost. The AD9122 includes an improved on-chip PLL (phased-locked loop) with lower jitter and phase noise. Operating with the on-chip PLL at a DAC output frequency of 150 MHz, the AD9122 delivers a 76-dB ACLR (adjacent-channel leakage ratio) for single-carrier WCDMA applications. For the most demanding wireless communications applications, the AD9122 can achieve 83-dBc ACLR using an external PLL.

The AD9122 includes integrated interpolation filters with selectable interpolation factors of 2, 4, and 8. The dual DAC also integrates 32-bit NCOs and is available in a space-saving 72-pin LFCSP (lead-frame chip-scale package) that is 50 percent smaller than previous generation DACs.

More information and early samples can be obtained by using the enquiry service below.