AD7892ARZ-1 vs AD7890AR-4

The AD7892ARZ-1 is a 12-bit, 500 kSPS successive-approximation ADC with a single input channel and an on-chip track-and-hold amplifier, offered in a 24-lead SOIC package. The AD7890AR-4 is a 12-bit, 117 kSPS data acquisition system that integrates an 8-channel input multiplexer, track-and-hold, and a successive-approximation ADC on a single chip, housed in a 24-lead SOIC. The AD7892ARZ-1 targets high-speed single-channel conversion, while the AD7890AR-4 targets multi-channel multiplexed acquisition at a lower throughput rate.

No. Although both devices are supplied in a 24-lead SOIC package, their pin functions differ because the AD7892ARZ-1 provides a single analog input with a parallel interface, whereas the AD7890AR-4 exposes eight multiplexed analog inputs plus channel-addressing and control pins. The pinouts are not interchangeable, and each device must be laid out according to its own datasheet pin configuration.

The AD7892ARZ-1 offers a throughput rate of 500 kSPS. The AD7890AR-4 provides a throughput rate of 117 kSPS. The higher conversion rate of the AD7892ARZ-1 suits fast single-channel signal capture, while the AD7890AR-4 trades speed for on-chip multi-channel multiplexing.

The AD7892ARZ-1 has a single analog input channel with an on-chip track-and-hold amplifier. The AD7890AR-4 integrates an 8-channel input multiplexer, allowing it to sequence through eight single-ended analog inputs. This makes the AD7890AR-4 suitable for multi-sensor or multi-channel data acquisition, while the AD7892ARZ-1 is intended for single-channel high-speed conversion.

Both devices provide a parallel digital output interface for connection to a microprocessor or DSP bus. The AD7892ARZ-1 outputs 12-bit conversion results over its parallel data bus, and the AD7890AR-4 likewise presents 12-bit results on a parallel interface, with additional control lines for channel selection and conversion start on the multiplexed part. Designers should consult each datasheet for the exact control-signal timing and bus-cycle requirements.

Both are 12-bit ADCs, so they share the same nominal resolution. However, they are separate product families with their own datasheet specifications for linearity, offset, gain, and total unadjusted error, and the AD7890AR-4 includes multiplexer-related error terms. Accuracy performance should therefore be compared using the respective manufacturer datasheets rather than assumed to be identical.

No. The two devices differ in channel count, throughput rate, pinout, and control architecture, so a direct drop-in replacement is not possible. Replacing one with the other requires a redesign of the analog front end, the digital control interface, and the PCB layout, followed by validation against the target system requirements.

The AD7890AR-4 is better suited for multi-channel data acquisition because it integrates an 8-channel multiplexer with the track-and-hold and 12-bit ADC on a single chip, reducing external component count. The AD7892ARZ-1, with its single input channel and 500 kSPS throughput, is better suited to high-speed single-channel applications where per-channel multiplexing is not required.