The AD9856 integrates a high‑speed direct‑digital synthesizer, a 12‑bit DAC, clock multiplier, digital filters and control logic into a single chip, providing a universal I/Q modulator and agile upconverter for communications applications. It is offered in a space‑saving surface‑mount package and operates over an industrial temperature range of –40 °C to +85 °C.
Key features include a programmable reference‑clock multiplier (4×‑20×), four pin‑selectable modulator profiles, bidirectional control‑bus interface, and low power consumption (less than 6 mW in full‑sleep mode). The datasheet provides detailed electrical specifications, pin descriptions, typical spectral plots, and mechanical dimensions for system designers.
| Resolution | 12 bits |
|---|---|
| Full‑Scale Output Current | 5 mA – 20 mA |
| Gain Error | ±10 % |
| Wideband SFDR at 80 MHz | 50 dBc |
| Power Supply Current (Full Operating Conditions) | 530 mA |
| Maximum Junction Temperature | +165 °C |
| Package | 48‑lead Quad Flatpack (LQFP) ST‑48 |
It is specified to operate from –40 °C to +85 °C.
The reference‑clock multiplier is programmable from 4× to 20× and can be disabled (effective 1×).
The device draws 530 mA under full operating conditions.
It comes in a 48‑lead Quad Flatpack (LQFP) ST‑48 package.