ADS7842EB

Analog To Digital Converters (ADC) Overview

The ADS7842EB is a 12-bit, 4-channel analog-to-digital converter (ADC) from Texas Instruments, utilizing a successive approximation register (SAR) architecture. It features parallel output and supports sampling rates up to 200 kS/s with single-ended inputs. The device operates on a single supply voltage ranging from 2.7 V to 5.25 V for both analog and digital domains. Key performance metrics include a signal-to-noise ratio (SNR) of 72 dB, differential nonlinearity (DNL) of ±1 LSB, and integral nonlinearity (INL) of ±1 LSB. Power consumption is specified at 1.8 mW during operation and 4.5 mW power dissipation. It is housed in an SSOP-28 package and functions within a temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• Integrates a 4-channel multiplexer with a high-speed SAR ADC core for efficient multi-point data acquisition.
• Provides parallel 3-state digital outputs for direct interface with microprocessors and DSPs without serial overhead.
• Supports low-power operation suitable for battery-driven portable instrumentation applications.

Analog To Digital Converters (ADC) Applications

• Portable multi-channel data loggers
• Industrial process control systems
• Battery-powered measurement devices

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'EB' against the manufacturer's current datasheet to confirm pinout compatibility and packaging details. Check for obsolescence status as some ADS7842 variants are marked as end-of-life. Ensure external reference voltage requirements match the system design, as this component uses an external reference. Confirm moisture sensitivity level handling procedures during assembly.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7842EB when parallel interface speed is prioritized over serial simplicity. Compare DNL/INL specifications against other ADS7842 variants if higher linearity is required. Consider the SSOP-28 footprint constraints versus alternative packages like the TSSOP or QFN if space is limited. Verify that the 200 kS/s sampling rate meets the Nyquist requirements for the input signal bandwidth.

Analog To Digital Converters (ADC) Part Context

The ADS7842 belongs to the ADS784x family of 12-bit ADCs from Texas Instruments. It shares architectural similarities with the ADS7841 but differs in interface type and package. The ADS7842 specifically offers parallel output, whereas counterparts like the ADS7841 use SPI. This places it in a niche for applications requiring high throughput without complex serial protocol handling.

Analog To Digital Converters (ADC) Replacement Considerations

ADS7842E/1K: Similar 12-bit 4-channel SAR ADC with parallel output, available in reel/cut tape packaging instead of tube.

Analog To Digital Converters (ADC) FAQ

Does the ADS7842EB have an internal voltage reference?

No, the ADS7842EB requires an external voltage reference. The reference voltage can range from 100 mV to VCC.

What is the maximum clock frequency for the ADS7842EB?

The device supports a sampling rate of up to 200 kS/s. The internal clock is derived from the external CLK input, which typically operates at frequencies up to 3.2 MHz depending on the configuration.

Is the ADS7842EB compatible with 3.3V logic levels?

Yes, the digital I/O pins are compatible with 3.3V logic levels when powered by a 3.3V supply, as the device operates within the 2.7V to 5.25V range.