AD7912ARMZ

Overview

The AD7912ARMZ is a dual-channel, 10-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices. It operates from a single 2.35 V to 5.25 V supply and supports throughput rates up to 1 MSPS. The device features an on-chip track-and-hold amplifier with a full power bandwidth of 8.5 MHz at 3 dB. Key electrical specifications include a maximum integral nonlinearity of ±0.5 LSB, differential nonlinearity of ±0.5 LSB, and a signal-to-noise ratio of 61 dB minimum at 100 kHz input frequency. Power consumption reaches 20 mW maximum at 5 V and 1 MSPS, dropping to 1 µA maximum in standby mode.

Feature Summary

• Dual-channel architecture with internal multiplexing for single-ended inputs ranging from 0 to VDD.
• Flexible serial interface compatible with SPI, QSPI, MICROWIRE, and DSP standards.
• Daisy-chain capability allowing multiple devices to be connected to a single bus.
• Advanced power management with programmable clock speed and low-power standby modes.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications.
• Medical instruments requiring high-speed data acquisition.
• Instrumentation and control systems.
• Data acquisition systems and high-speed modems.
• Optical sensors.

Procurement Notes

Verify the specific package variant, as the AD7912 is available in both MSOP and TSOT configurations. Confirm that the A Grade temperature range meets the operational requirements of the target environment. Ensure the ordering suffix matches the required tape and reel or cut tape format specified by the distributor.

Selection Notes

Select the AD7912 when a 10-bit resolution is sufficient for the application, distinguishing it from the 12-bit AD7922. Consider the MSOP package for standard surface-mount assembly or the TSOT package for space-constrained designs. Evaluate the power dissipation requirements against the available thermal headroom in the final enclosure.

Part Context

The AD7912 belongs to the AD7912/AD7922 family of high-speed, low-power ADCs. It shares the same pinout and functional block diagram as the 12-bit AD7922, differing primarily in resolution and associated dynamic performance metrics. Both devices utilize the same SAR architecture and serial interface protocols.

Replacement Considerations

The AD7922 serves as a higher-resolution alternative within the same package and pinout configuration. For applications requiring lower resolution but similar form factors, verify compatibility with other members of the PulSAR ADC family.