AD660AR

Overview

The AD660AR is a monolithic 16-bit digital-to-analog converter manufactured by Analog Devices Inc. in a 24-lead SOIC package. It integrates an on-chip buried Zener voltage reference, double-buffered latches, and an output amplifier. The device operates with +VCC of +13.5 V to +16.5 V, -VEE of -13.5 V to -16.5 V, and +VLL of +4.5 V to +5.5 V. Key electrical specifications include ±1 LSB integral nonlinearity (INL), 15-bit monotonicity over temperature, and a typical glitch impulse of 15 nV-s. The output amplifier settles within 10 μs for a full-scale step.

Feature Summary

• Complete 16-bit DAC with integrated 10.000 V laser-trimmed buried Zener reference (±0.1% error, ±15 ppm/°C drift).
• Flexible digital interface supporting serial (MSB/LSB first) or byte input modes with daisy-chain capability via SOUT pin.
• Pin-programmable unipolar (0 V to 10 V) or bipolar (-10 V to +10 V) output ranges without external components.
• Double-buffered latches eliminate data skew errors and enable simultaneous multi-DAC updates.

Applications

• Precision industrial process control systems requiring high linearity.
• Test and measurement equipment needing low distortion and fast settling.
• Audio signal processing applications utilizing low THD+N performance.
• Multi-channel data acquisition systems leveraging daisy-chain serial interfaces.

Procurement Notes

Verify the ordering suffix AR confirms the 24-lead SOIC package and -40°C to +85°C operating temperature range. Confirm supply voltages match the specified +15 V analog and +5 V digital rails. Check for RoHS compliance status if required by project specifications. Ensure ESD precautions are observed during handling due to CMOS logic inputs.

Selection Notes

Select the AD660AR when a complete 16-bit solution with internal reference and output buffer is required in a surface-mount package. Compare against the AD660AN (Plastic DIP) if through-hole mounting is preferred. Consider external references like the AD587 if lower gain drift than the internal ±15 ppm/°C is necessary. Verify that the 15-bit monotonicity meets system stability requirements.

Part Context

The AD660 belongs to the DACPORT family, utilizing BiMOS II technology to combine high-precision bipolar linear circuits with low-power CMOS logic. The AR grade specifically denotes the commercial temperature range variant housed in a small outline integrated circuit (SOIC) package, distinguishing it from the plastic DIP (AN) and ceramic DIP (SQ) versions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The AD660ANZ is listed as a similar alternative in distributor databases but uses a different package type.

FAQ

How is the output polarity configured?

The output polarity is pin-programmable. Connecting Pin 22 (SPAN/BIPOLAR OFFSET) to Pin 21 (VOUT) configures unipolar 0 V to 10 V output. Connecting Pin 22 to Pin 23 (REF IN) configures bipolar -10 V to +10 V output.

What is the maximum integral nonlinearity error?

The integral nonlinearity (INL) is specified as ±1 LSB (maximum) at 25°C and ±4 LSB (maximum) over the full temperature range for both unipolar and bipolar operations.

Can the internal reference be used externally?

Yes, the internal reference is available at Pin 24 (REF OUT). It provides a buffered 10.000 V output with a minimum of 2 mA available for external loads, though an external op amp is recommended for currents exceeding 4 mA.