LTC2621IDD-1#TRPBF

Overview

The LTC2621IDD-1#TRPBF is a single-channel, 12-bit rail-to-rail voltage output digital-to-analog converter (DAC) from Analog Devices. It operates on a 2.5V to 5.5V supply and features built-in high-performance output buffers capable of sourcing or sinking at least 15mA. The device utilizes a 3-wire SPI/Microwire compatible interface with clock rates up to 50MHz and includes daisy-chain capability. As an '-1' variant, it incorporates a power-on reset circuit that sets outputs to midscale upon initialization. It is housed in a compact 3mm × 3mm 10-lead DFN package and supports an industrial temperature range of –40°C to 85°C.

Feature Summary

• 12-bit resolution with guaranteed monotonicity over temperature
• Rail-to-rail output drive with ±15mA minimum current capability
• Power-on reset to midscale for -1 suffix variants
• Low power consumption: 300μA at 3V, down to 1μA max in power-down mode

Applications

• Mobile communications systems
• Process control and industrial automation
• Instrumentation equipment
• Automatic test equipment

Procurement Notes

Verify the specific ordering suffix '#TRPBF' confirms tape and reel packaging and lead-free finish. Confirm the '-1' suffix indicates the power-on reset to midscale feature. Ensure the 'IDD' designation matches the required –40°C to 85°C industrial operating temperature range for the target application environment.

Selection Notes

Select this component when a single-channel 12-bit DAC with rail-to-rail output drive is required in a small footprint. The '-1' variant is necessary if system initialization requires outputs to settle at midscale during power-up rather than zero scale. Verify that the 50MHz serial clock speed and 3-wire interface compatibility match the host microcontroller's capabilities.

Part Context

This part belongs to the LTC2601/LTC2611/LTC2621 family of pin-compatible DACs. The LTC2621 provides 12-bit resolution, whereas the LTC2611 offers 14 bits and the LTC2601 provides 16 bits. All members share the same 10-lead DFN package and electrical interface characteristics, allowing for design flexibility across different resolution requirements without changing the board layout.

Replacement Considerations

LTC2621CDD-1#TRPBF (Commercial temperature grade 0°C to 70°C)

FAQ

What is the default output state of the LTC2621IDD-1#TRPBF upon power-up?

Due to the '-1' suffix, the internal power-on reset circuit sets the voltage outputs to midscale until a valid write and update command are executed.

How does the LDAC pin function asynchronously?

If CS/LD is high, a low signal on the LDAC pin immediately updates the DAC register with the contents of the input register, allowing for asynchronous analog output updates independent of the serial interface timing.

What is the maximum serial clock frequency supported?

The device supports a serial clock (SCK) frequency of up to 50MHz.