AD7946BRMZ

Overview

The AD7946BRMZ is a 14-bit, 500 kSPS PulSAR analog-to-digital converter (ADC) from Analog Devices Inc. It operates on a single 5 V supply with a pseudo-differential input range of 0 V to REF. The device features an INL of ±0.4 LSB typical and ±1 LSB maximum, with SINAD at 85 dB and THD at −100 dB at 20 kHz. Power dissipation is 3.3 mW at 5 V/100 kSPS and 3.3 µW at 5 V/100 SPS, with a standby current of 1 nA. It supports 1.8 V/2.5 V/3 V/5 V logic interfaces via a separate VIO pin and is housed in a 10-lead MSOP or LFCSP package.

Feature Summary

• Single-supply operation with versatile serial interface compatibility
• Low power consumption with programmable standby mode
• High accuracy with no missing codes guarantee

Applications

• Battery-powered equipment
• Data acquisition systems
• Instrumentation
• Medical instruments
• Process control

Procurement Notes

Verify the specific package variant (MSOP or LFCSP) required for your PCB layout, as both are available for this part number. Confirm that the external reference voltage source can handle the dynamic load current requirements during conversion cycles. Ensure the host microcontroller logic levels match the VIO supply voltage configuration for proper signal integrity.

Selection Notes

Select the AD7946BRMZ when a 14-bit resolution with 500 kSPS throughput is required in a low-power environment. Consider this component if daisy-chaining multiple ADCs on a single bus is necessary, as it supports chain mode. Verify that the application can accommodate the pseudo-differential input architecture and provides a stable reference voltage up to VDD.

Part Context

The AD7946 belongs to the PulSAR ADC family, which utilizes charge redistribution successive approximation architecture. It is designed for applications requiring high precision and low power consumption. The device is pin-for-pin compatible with the 16-bit AD7686, allowing for potential upgrades in resolution without changing the PCB footprint.

Replacement Considerations

The AD7686 is a pin-for-pin compatible alternative offering 16-bit resolution. For lower speed requirements, the AD7942 (250 kSPS) or AD7940 (100 kSPS) may be suitable. Higher speed options include the AD7980 series.