AD7890AN-2 - 8-Channel 12-Bit Serial ADC | Analog Devices
MPN: AD7890AN-2 β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.8 | $980.00 |
| 500 | $8.5 | $4,250.00 |
| 1,000 | $7.2 | $7,200.00 |
Drop-in alternatives for AD7890AN-2 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
AD7890ANZ-10
β Drop-Inβ In Stock
$11.75 / Unit
View Datasheet βAD7890SQ-2
β Drop-Inπ Reference alternative (not in catalog)
AD7890BQ-2
β Drop-Inπ Reference alternative (not in catalog)
AD7892AN-2
β Drop-Inπ Reference alternative (not in catalog)
AD7851ANZ
β Drop-Inπ Reference alternative (not in catalog)
AD7890AN-2 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Channels | 8 |
| Sampling Rate | 117 kSPS |
| Input Type | Single-Ended |
| Input Voltage Range | 0 V to 2.5 V |
| Interface | SPI |
| Architecture | SAR |
| Reference Type | Internal, 2.5 V |
| Supply Voltage | 5 V |
| Conversion Time | 5.9 Β΅s |
| Operating Temperature Range | -40Β°C to +85Β°C |
| Package | 24-PDIP (N) |
| Mounting Type | Through Hole |
| Product Status | Obsolete |
| RoHS Status | unknown |
AD7890AN-2 Pin Configuration
| Pin 1 | VIN1 β Analog input channel 1 |
| Pin 2 | VIN2 β Analog input channel 2 |
| Pin 3 | VIN3 β Analog input channel 3 |
| Pin 4 | VIN4 β Analog input channel 4 |
| Pin 5 | VIN5 β Analog input channel 5 |
| Pin 6 | VIN6 β Analog input channel 6 |
| Pin 7 | VIN7 β Analog input channel 7 |
| Pin 8 | VIN8 β Analog input channel 8 |
| Pin 9 | GND β Ground |
| Pin 10 | VDD β Power supply (5 V) |
| Pin 11 | SCLK β Serial clock input |
| Pin 12 | SDATA β Serial data output |
| Pin 13 | CS β Chip select (active low) |
| Pin 14 | REF β Reference output (2.5 V) |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD7890AN-2 is suitable for 6 applications: Industrial Process Control, Data Acquisition Systems, Battery Monitoring, Medical Instrumentation, Test and Measurement, Automotive Test Systems.
Industrial Process Control
The AD7890AN-2 is ideal for industrial process control systems that monitor multiple analog sensors. Its 8-channel input multiplexer allows sampling of up to eight different signals, such as temperature, pressure, and flow, with a single ADC. The 12-bit resolution provides adequate precision for most industrial transducers, and the serial interface simplifies wiring and isolation. The 0-2.5 V input range is compatible with many sensor outputs, and the 117 kSPS sampling rate is sufficient for slow-changing process variables. The device operates over the industrial temperature range, ensuring reliability in harsh environments.
Recommended
Data Acquisition Systems
In general-purpose data acquisition systems, the AD7890AN-2 provides a complete analog front-end, integrating multiplexing, sampling, and conversion. Its 8 channels can be used to digitize multiple analog signals for logging or analysis. The on-chip track/hold amplifier ensures accurate sampling of dynamic signals, while the internal 2.5 V reference reduces external component count. The serial interface allows easy connection to microcontrollers or DSPs, and the 117 kSPS throughput is adequate for many applications. The 24-pin PDIP package is convenient for prototyping and breadboarding.
Recommended
Battery Monitoring
The AD7890AN-2 can be used in battery monitoring systems to measure cell voltages and temperatures. Its 8 channels allow monitoring of multiple cells in a battery pack, and the 0-2.5 V input range is suitable for individual cell voltages. The low power consumption of the SAR ADC is beneficial for battery-powered systems. The serial interface enables daisy-chaining or isolated communication. However, the 117 kSPS sampling rate is more than sufficient for battery monitoring, which typically requires slower updates. The device's industrial temperature range ensures operation in various environments.
Recommended
Medical Instrumentation
In medical instrumentation, the AD7890AN-2 can be used for monitoring physiological signals such as temperature, pressure, and bio-potentials. Its 8 channels allow simultaneous sampling of multiple sensors, and the 12-bit resolution is adequate for many diagnostic applications. The serial interface simplifies isolation for patient safety. The 0-2.5 V input range is compatible with many medical sensor outputs. The device's small footprint and low power consumption are advantageous for portable devices. However, for higher resolution requirements, consider alternatives like the AD7851ANZ with 14-bit resolution.
Recommended
Test and Measurement
The AD7890AN-2 is suitable for test and measurement equipment that requires multi-channel data acquisition. Its 8 channels can be used to digitize multiple test points, and the 12-bit resolution provides good accuracy for general-purpose measurements. The serial interface allows easy integration into automated test systems. The 117 kSPS sampling rate is sufficient for many applications, such as logging voltage and current waveforms. The device's through-hole package is convenient for prototyping and repair. However, for higher speed or resolution, consider the AD7892AN-2 or AD7851ANZ.
Recommended
Automotive Test Systems
In automotive test systems, the AD7890AN-2 can be used to monitor sensor outputs from engine control units, battery management, and environmental controls. Its 8 channels allow simultaneous sampling of multiple signals, and the 12-bit resolution is adequate for many automotive sensors. The serial interface simplifies wiring in test setups. The device operates over the industrial temperature range, making it suitable for under-hood or test bench environments. However, for automotive-grade qualification, consider the AD7890SQ-2 (military grade) or other AEC-Q100 qualified ADCs. The 0-2.5 V input range may require signal conditioning for higher voltage sensors.
Recommended
Recommended Products Summary
Engineering reference data for AD7890AN-2 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7890ANZ-10 | AD7890SQ-2 | AD7892AN-2 | AD7851ANZ |
|---|---|---|---|---|---|
| Package | 24-PDIP (N) | 24-PDIP (N) | 24-PDIP (N) | 24-PDIP (N) | 24-PDIP (N) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 14 bits |
| Sampling Rate | 117 kSPS | 117 kSPS | 117 kSPS | 600 kSPS | [DATA_NEEDED] |
| Input Voltage Range | 0 V to 2.5 V | Β±10 V | 0 V to 2.5 V | 0 V to 2.5 V | [DATA_NEEDED] |
| Interface | SPI | SPI | SPI | SPI | SPI |
| Operating Temperature | -40Β°C to +85Β°C | -40Β°C to +85Β°C | -55Β°C to +125Β°C | -40Β°C to +85Β°C | -40Β°C to +85Β°C |
| Lifecycle Status | Obsolete | Active | Obsolete | Obsolete | Active |
Key Differentiators
- 8-channel multiplexer integrated (vs AD7851ANZ)
- Lower sampling rate but sufficient for many applications (vs AD7892AN-2)
- 0-2.5 V input range optimized for unipolar sensors (vs AD7890ANZ-10)
Design Notes
The AD7890AN-2 operates from a single 5 V supply. Ensure that the supply is clean and well-regulated, as noise on VDD can affect conversion accuracy. Use a 0.1 Β΅F ceramic capacitor and a 10 Β΅F tantalum capacitor close to the VDD pin for decoupling. The internal reference is 2.5 V; if an external reference is used, ensure it is stable and low-noise.
For optimal performance, place the AD7890AN-2 on a PCB with a solid ground plane. Keep analog input traces short and shielded from digital signals to minimize noise coupling. Use separate analog and digital ground planes if possible, and connect them at a single point. Decouple the reference pin with a 0.1 Β΅F capacitor to ground.
A common pitfall is exceeding the absolute maximum input voltage on the analog inputs. The AD7890AN-2 accepts 0-2.5 V; applying higher voltages can damage the device. Also, ensure that the serial clock frequency does not exceed the maximum specified in the datasheet to avoid data corruption. When the part is obsolete, verify availability before designing it into a new product.
Compliance Information
Compliance information not provided in the verified data. The part is obsolete, so compliance may not be guaranteed.
