AD5665RBCPZ-R2

Overview

The AD5665RBCPZ-R2 is a quad, 16-bit buffered voltage-output nanoDAC from Analog Devices. It operates on a single 2.7 V to 5.5 V supply and features an I2C-compatible serial interface supporting standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes. This specific variant includes an on-chip 2.5 V reference with a temperature coefficient of 5 ppm/°C in the TSSOP package, enabling a full-scale output range of 5 V. The device guarantees monotonicity by design and incorporates a power-on reset circuit that defaults outputs to zero scale or midscale. It offers per-channel power-down capabilities and hardware LDAC and CLR functions for precise control.

Feature Summary

• Quad 16-bit resolution with rail-to-rail output amplifiers
• On-chip 2.5 V precision reference (5 ppm/°C in TSSOP)
• I2C interface with standard, fast, and high-speed mode support
• Power-on reset to zero scale or midscale via POR pin configuration

Applications

• Process control systems
• Data acquisition systems
• Portable battery-powered instruments
• Digital gain and offset adjustment circuits
• Programmable voltage and current sources

Procurement Notes

Verify the package type matches the required form factor, as the R suffix denotes the presence of an internal reference while the BC indicates the LFCSP package. Confirm the revision level (Rev F) aligns with design specifications. Ensure the operating voltage range of 2.7 V to 5.5 V is compatible with the system power rails. Check that the I2C address bits set by ADDR1 and ADDR2 pins do not conflict with other devices on the bus.

Selection Notes

Select this component when four independent 16-bit DAC channels are required in a compact footprint. The internal 2.5 V reference simplifies design by eliminating external reference components, provided the 5 V full-scale range meets application needs. Choose the TSSOP version if a 5 ppm/°C reference stability is critical; otherwise, the LFCSP version offers a 10 ppm/°C reference. Ensure the system supports the desired I2C clock speed, noting that high-speed mode requires careful PCB layout to manage capacitance.

Part Context

The AD5665RBCPZ-R2 belongs to the nanoDAC family, which provides low-power, small-footprint digital-to-analog conversion solutions. It is part of a broader series including 12-bit and 14-bit variants (AD5625R/AD5645R) and SPI-interface versions (AD5624R/AD5664R). The 'R' suffix distinguishes it from non-reference models like the AD5665, which require an external reference. The 'BCPZ' code specifies the 10-lead LFCSP package with lead-free termination.

Replacement Considerations

Direct substitutes include the AD5665RBRUZ-2 (TSSOP package) for larger board space or the AD5665RBRUZ-REEL7 (WLCSP package) for ultra-small footprints. For applications requiring different resolutions, the AD5645R (14-bit) or AD5625R (12-bit) offer pin-compatible alternatives with lower accuracy requirements. Non-reference versions like the AD5665 can be used if an external reference is already present in the design.