AD9957 is a 1 GSPS digital upconverter with integrated 1 GSPS 14-bit DAC and 250 MSPS input data rate.
The AD9957 is a 1 GSPS quadrature digital upconverter with an 18‑bit I/Q data path and a 14‑bit DAC, designed for communications systems where size, power consumption, and performance are critical. It integrates a high‑speed DDS, a 14‑bit DAC, clock multiplier circuitry, digital filters, and other DSP functions onto a single chip.\n\nThe data sheet includes sections on features, applications, functional block diagram, electrical specifications, absolute maximum ratings, pin configuration, timing characteristics, and various operation modes such as quadrature modulation, BlackFin interface, interpolating DAC, and single‑tone mode. Detailed electrical specs, power consumption figures, and layout dimensions are also provided.
| Internal clock speed | 1 GSPS (up to 400 MHz analog output) |
|---|---|
| DAC resolution | 14‑bit |
| Phase noise | ≤ −125 dBc/Hz (400 MHz carrier @ 1 kHz offset) |
| Dynamic range (SFDR) | > 80 dB narrow‑band |
| Power consumption (Single Tone Mode) | 800 mW |
| Supply voltage (AVDD 1.8 V) | 1.8 V ± 5 % |
| Supply voltage (AVDD 3.3 V) | 3.3 V ± 5 % |
The AD9957 operates with a 1 GSPS internal clock speed, supporting up to 400 MHz analog output.
The device requires AVDD 1.8 V ± 5 %, AVDD 3.3 V ± 5 %, DVDD 1.8 V ± 5 %, and DVDD_I/O 3.3 V ± 5 % supplies.
The AD9957 includes an integrated 14‑bit DAC.
Phase noise is ≤ −125 dBc/Hz at a 400 MHz carrier with a 1 kHz offset.