The AD664 is a four-channel 12-bit analog-to-digital converter that can simultaneously convert four data sets to voltage signals and output four voltage signals. The product uses a double-buffered input latch structure and a data readback function, and can read and write through a single microprocessor-compatible I/O port. The I/O port supports 4-bit, 8-bit or 12-bit parallel bytes for simple interfacing with a variety of microprocessors. The product also provides a reset to zero control pin to allow the user to simultaneously reset all DAC outputs to zero, regardless of the contents of the input latch. Any one or all DACs can be placed in a transparent mode to allow the user to read DAC outputs during read operations.
The AD664 is a monolithic 12‑bit quad DAC that provides four independent voltage‑output channels on a single IC. Each channel features a double‑buffered latch, read‑back capability, and a reset‑to‑zero control pin, allowing simultaneous zeroing of all outputs. The device supports unipolar (0 V to +2 V) and bipolar (‑2 V to +2 V) output ranges, with programmable gain of 1 × or 2 × the reference voltage.
The datasheet includes detailed electrical specifications, pin‑out diagrams for 44‑pin and 28‑pin packages, grounding recommendations, and performance graphs such as settling time, crosstalk, and output noise. Power supply requirements, decoupling guidelines, and current‑boosting options are also provided to aid designers in integrating the AD664 into test equipment, robotics, and instrumentation applications.
| Resolution | 12 bits |
|---|---|
| Output Current per Channel | 5 mA |
| Load Capacitance | 500 pF |
| Settling Time | < 10 µs |
| Linearity Error | 0.5 LSB (typical) |
| Monotonicity | Guaranteed over full temperature range |
Each DAC output can source or sink up to 5 mA of current.
A dedicated RESET‑TO‑ZERO pin can be strobed to reset all DAC outputs to 0 V.
The device can handle a load capacitance of up to 500 pF.
The output settling time is typically under 10 µs.