ADS7844E

Analog To Digital Converters (ADC) Overview

The ADS7844E is a 12-bit, 8-channel analog-to-digital converter (ADC) manufactured by Texas Instruments. It utilizes a successive approximation register (SAR) architecture and features an SPI-compatible serial interface. The device supports a sampling rate of 200 kS/s with pseudo-differential or single-ended input types. It operates on an analog supply voltage range of 2.7 V to 5.25 V and a digital supply voltage range of 1.9 V to 5.5 V. Key performance metrics include a differential nonlinearity (DNL) of +/- 0.8 LSB, integral nonlinearity (INL) of +/- 2 LSB, and a signal-to-noise and distortion ratio (SINAD) of 72 dB. Typical power consumption is 1.8 mW, with a maximum power dissipation of 4.5 mW. The component is housed in a 20-pin QSOP package and functions within a temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• Eight-channel multiplexed input capability supporting pseudo-differential and single-ended configurations
• Low-power operation suitable for battery-driven applications with typical consumption of 1.8 mW
• High-speed data acquisition with a throughput rate of 200 kS/s via synchronous serial interface

Analog To Digital Converters (ADC) Applications

• Battery-operated personal digital assistants
• Portable multichannel data loggers
• Industrial measurement equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix designation when ordering, as markings may have been standardized across variants. Confirm package type availability, as the E suffix typically denotes the QSOP-20 package. Ensure compatibility with external reference requirements if high precision is needed. Check humidity sensitivity handling procedures during storage and assembly. Validate that the operating voltage ranges match the system design constraints before integration.

Analog To Digital Converters (ADC) Selection Notes

Select this component for designs requiring multiple analog inputs with moderate resolution and speed. Consider the external reference requirement if internal accuracy is insufficient. Evaluate the pin count and package size against board space limitations. Compare power consumption against other SAR ADCs if battery life is critical. Verify interface compatibility with the target microcontroller or DSP for seamless integration.

Analog To Digital Converters (ADC) Part Context

The ADS7844 belongs to the ADS784x family of low-power, high-speed ADCs from Texas Instruments. It shares architectural similarities with the ADS7841 but offers eight channels instead of four. The device is designed to interface directly with microcontrollers and digital signal processors. It complements the ADS834x series, which provides 16-bit resolution with similar power characteristics. This family targets portable electronics and industrial monitoring applications.

Analog To Digital Converters (ADC) Replacement Considerations

ADS7844N: Pin-compatible alternative with potentially different marking standards. ADS7844EB: Variant with improved linearity specifications (±1 LSB INL/DNL). ADS7844EG4: RoHS-compliant version of the standard ADS7844E. Verify electrical parameter differences and packaging options before substitution.