ADS9227RHAR

Analog To Digital Converters (ADC) Overview

The ADS9227RHAR is a dual-channel, simultaneous-sampling, 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It operates at a sampling rate of 5 MSPS per channel with an input bandwidth of 45 MHz. The device integrates a precision reference and an ADC driver, eliminating the need for external components. It features a serial LVDS interface supporting SDR and DDR modes. Power supplies include AVDD_5V (4.5V to 5.5V) and VDD_1V8 (1.75V to 1.85V). Key performance metrics include ±0.3 LSB typical DNL/INL, 93.9 dBFS SNR, and operation from -40°C to +125°C in a 40-pin VQFN package.

Analog To Digital Converters (ADC) Feature Summary

• Integrated signal chain includes an ADC driver and precision reference to simplify design.
• Dual-channel architecture provides simultaneous sampling capability.
• Serial LVDS data interface minimizes digital switching noise while enabling high-speed communication.
• Extended operating temperature range supports harsh industrial environments.

Analog To Digital Converters (ADC) Applications

• Power analyzers
• Source measurement units (SMU)
• Marine equipment
• Servo drive position feedback
• DC power supplies, AC sources, electronic loads

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix RHAR corresponds to the VQFN-40 package configuration before procurement. Confirm that the internal reference voltage selection via the SDI pin aligns with system requirements, as this determines whether external decoupling is necessary. Ensure the host controller supports the required SPI configuration interface timings and SLVDS data reception protocols for reliable operation.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS9227RHAR when a 5 MSPS throughput is sufficient, offering lower power consumption compared to the 10 MSPS ADS9228 or 20 MSPS ADS9229 variants within the same family. The integrated driver and reference reduce bill-of-materials count. Verify that the 45 MHz input bandwidth meets the signal frequency requirements, as higher-bandwidth models are available if wider bandwidth is needed.

Analog To Digital Converters (ADC) Part Context

The ADS9227RHAR belongs to the ADS922x family of dual-channel SAR ADCs, which also includes the ADS9228 and ADS9229. These devices share identical pinouts, interfaces, and architectural features, differing primarily in maximum sampling rates and associated power consumption levels. This family is designed for applications requiring high accuracy and simplified signal chains.

Analog To Digital Converters (ADC) Replacement Considerations

ADS9228RHAR: Higher speed (10 MSPS), slightly higher power. ADS9229RHAR: Highest speed (20 MSPS), highest power. All share the same package and pinout.

Analog To Digital Converters (ADC) FAQ

How is the common-mode voltage set for the analog inputs?

The device includes an integrated common-mode voltage output buffer (VCMOUT). This pin outputs a fixed internal voltage (typically 2.385V for ADS9227) that sets the common-mode level for the differential analog inputs.

Can the ADS9227 operate with an external reference voltage?

Yes. By configuring the SPI_EN pin and connecting the SDI/EXTREF pin to GND, the device can accept an external reference voltage applied to the REFIO pin instead of using the internal reference.

What is the maximum sampling clock frequency for the ADS9227?

The maximum sampling frequency for the ADS9227 is 5 MHz, corresponding to a cycle time period of 200 ns.