AD9956

RECOMMENDED FOR NEW DESIGNS

2.7 GHz DDS-Based AgileRF™ Synthesizer

Analog Devices AD9956 Product Info

10 February 2026 7

Features

400 MSPS Internal DDS Clock Speed
48-bit frequency tuning word
14-bit Programmable Phase Offset
Integrated 14-bit DAC
- Excellent Dynamic Performance
- Phase noise ≤ 135 dBc/Hz @ 1 KHz offset
- −80 dB SFDR @ 160 MHz (±100 KHz offset I_OUT)
25 Mb/s write-speed serial I/O control
655 MHz programmable input dividers for the phase
- frequency detector (÷M, ÷N) {M, N = 1..16} (bypassable)
Programmable RF divider (÷R) {R = 1, 2, 4, 8} (bypassable)

8 phase/frequency profiles
1.8 V supply for device operation
3.3 V supply for I/O and charge pump
Software controlled power-down
48-lead LFCSP package
Automatic linear frequency sweeping capability (in DDS)
Programmable charge pump current (up to 4 mA)
Phase modulation capability
Multichip synchronization
Dual-mode PLL lock detect
655 MHz CML-mode PECL-compliant driver

Part details & applications

The AD9956 is Analog Devices’s first AgileRF synthesizer. The device is comprised of a DDS and PLL circuitry. The DDS features a 14-bit DAC operating up to 400 MSPS and a 48-bit frequency tuning word. The PLL Circuitry includes a phase detector with scaleable 200 MHz inputs (pre-scalar inputs operate up to 650 MHz) and digital control over the charge pump current. The device also includes a 650 MHz PECL driver with programmable slew rates.The AD9956 uses advanced DDS technology, an internal high-speed, high performance D/A converter and an advance phase-detector/charge pump combination to enable the synthesis of digitally-programmable, frequency-agile analog output sinusoidal waveforms up to 2.7 GHz. The AD9956 is designed to provide fast frequency hopping and fine tuning resolution (48-bit frequency tuning word). Information is loaded into the AD9956 via a serial I/O port which has a device write speed of 25 MBit/sec. The AD9956 DDS block also supports a user defined linear sweep mode of operation.

The AD9956 is specified to operate over the extended automotive range of −40°C to +125°C.

Applications

Agile LO frequency synthesis
FM chirp source for radar and scanning systems
Automotive radars
Test and measurement equipment
Acousto-optic device drivers

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