AD7890BR-4 - 8-Channel 12-Bit DAS | Analog Devices
MPN: AD7890BR-4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.75 | $167.50 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.8 | $6,400.00 |
| 1,000 | $11.35 | $11,350.00 |
Drop-in alternatives for AD7890BR-4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7890BRZ-4
✅ Drop-In📋 Reference alternative (not in catalog)
AD7890BR-4 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Channels | 8 single-ended |
| Conversion Time | 5.9 µs |
| Sample Rate | 117 kSPS |
| Analog Input Range | 0 V to 4.096 V |
| Supply Voltage | 5 V (single) |
| Interface | Serial (SPI-compatible) |
| Package | 24-SOIC (narrow) |
| Operating Temperature Range | -40°C to +85°C |
| On-Chip Track/Hold | Yes |
| On-Chip Reference | Yes |
| Technology | LC2MOS |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Number of Pins | 24 |
AD7890BR-4 Pin Configuration
| Pin 1 | VIN0 — Analog input channel 0 |
| Pin 2 | VIN1 — Analog input channel 1 |
| Pin 3 | VIN2 — Analog input channel 2 |
| Pin 4 | VIN3 — Analog input channel 3 |
| Pin 5 | VIN4 — Analog input channel 4 |
| Pin 6 | VIN5 — Analog input channel 5 |
| Pin 7 | VIN6 — Analog input channel 6 |
| Pin 8 | VIN7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | VREF — Reference voltage output/input |
| Pin 11 | DGND — Digital ground |
| Pin 12 | SCLK — Serial clock input |
| Pin 13 | SDATA — Serial data output |
| Pin 14 | CS — Chip select (active low) |
| Pin 15 | BUSY — Busy output (high during conversion) |
| Pin 16 | VDD — Power supply (5V) |
| Pin 17 | NC — No connect |
| Pin 18 | NC — No connect |
| Pin 19 | NC — No connect |
| Pin 20 | NC — No connect |
| Pin 21 | NC — No connect |
| Pin 22 | NC — No connect |
| Pin 23 | NC — No connect |
| Pin 24 | NC — No connect |
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
AD7890BR-4 is suitable for 6 applications: Industrial Process Control, Data Acquisition Systems, Battery-Powered Instrumentation, Medical Monitoring Equipment, Automotive Test Systems, Test and Measurement Equipment.
Industrial Process Control
The AD7890BR-4 is ideal for industrial process control systems that monitor multiple sensors such as temperature, pressure, and flow. Its 8-channel multiplexer allows direct connection of up to 8 analog sensors, while the 12-bit resolution provides sufficient accuracy for control loops. The 5.9 µs conversion time enables fast sampling of dynamic process variables, and the serial interface simplifies isolation and communication with PLCs or microcontrollers. The device operates from a single 5 V supply, which is common in industrial control panels, and its -40°C to +85°C temperature range ensures reliable operation in harsh environments. The on-chip track/hold amplifier ensures accurate sampling of rapidly changing signals, and the on-chip reference eliminates the need for external reference components, reducing board space and cost.
Recommended
Data Acquisition Systems
In general-purpose data acquisition systems, the AD7890BR-4 provides a compact, integrated solution for digitizing multiple analog signals. Its 8 single-ended channels can be used to monitor various inputs, and the serial interface allows easy connection to a wide range of microcontrollers and DSPs. The 12-bit resolution is suitable for many measurement applications, and the 117 kSPS sample rate supports moderate-speed data logging. The device's low power consumption and single-supply operation make it suitable for portable and battery-powered data loggers. The independently accessible multiplexer allows the insertion of antialiasing filters or signal conditioning circuits between the mux and the ADC, providing design flexibility. The on-chip reference ensures stable conversions over temperature, which is critical for accurate measurements.
Recommended
Battery-Powered Instrumentation
The AD7890BR-4 is well-suited for battery-powered instrumentation due to its low power consumption and single 5 V supply operation. It can be powered directly from a 5 V battery or a regulated supply, and its low quiescent current extends battery life. The 8-channel multiplexer allows monitoring of multiple battery cells or system parameters, and the 12-bit resolution provides adequate precision for voltage and current monitoring. The serial interface minimizes the number of I/O lines required, reducing microcontroller pin usage. The device's small SOIC-24 package is ideal for space-constrained portable devices. The on-chip track/hold and reference reduce external component count, further saving space and power. The operating temperature range of -40°C to +85°C ensures reliable operation in various environmental conditions.
Recommended
Medical Monitoring Equipment
In medical monitoring equipment, the AD7890BR-4 can be used to digitize signals from multiple physiological sensors, such as ECG, temperature, and pressure. Its 8-channel multiplexer allows simultaneous monitoring of several parameters, and the 12-bit resolution is sufficient for many diagnostic applications. The device's low power consumption is critical for portable and wearable medical devices. The serial interface simplifies data transfer to a processing unit, and the on-chip reference ensures accurate conversions. The -40°C to +85°C operating range covers the typical medical device temperature requirements. The small SOIC-24 package is suitable for compact designs. The independently accessible multiplexer allows the insertion of signal conditioning circuits, such as filters and amplifiers, between the mux and the ADC, which is essential for medical signal processing.
Recommended
Automotive Test Systems
The AD7890BR-4 is suitable for automotive test systems that require monitoring of multiple analog signals, such as battery voltage, temperature, and pressure. Its 8-channel multiplexer allows connection of multiple sensors, and the 12-bit resolution provides adequate accuracy for test and measurement. The device operates from a single 5 V supply, which is common in automotive electronics, and its -40°C to +85°C temperature range is suitable for under-hood and in-cabin environments. The serial interface simplifies integration with automotive microcontrollers and CAN transceivers. The on-chip track/hold ensures accurate sampling of dynamic signals, and the on-chip reference reduces external component count. The small SOIC-24 package is suitable for space-constrained automotive modules.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the AD7890BR-4 provides a versatile front-end for digitizing multiple analog signals. Its 8-channel multiplexer allows monitoring of various test points, and the 12-bit resolution is suitable for many benchtop instruments. The 5.9 µs conversion time enables fast data acquisition, and the serial interface allows easy connection to a host processor. The device's low power consumption is beneficial for portable test equipment. The on-chip reference ensures stable measurements over temperature, and the independently accessible multiplexer allows the insertion of programmable gain amplifiers or filters. The SOIC-24 package is easy to integrate into PCB designs. The device's wide operating temperature range makes it suitable for both laboratory and field use.
Recommended
Recommended Products Summary
Engineering reference data for AD7890BR-4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7890BRZ-4 | AD7890ANZ-4 | AD7890AN-2 | AD7890ANZ-10 |
|---|---|---|---|---|---|
| Package | 24-SOIC | 24-SOIC | 24-PDIP | 24-PDIP | 24-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Range | 0 V to 4.096 V | 0 V to 4.096 V | 0 V to 4.096 V | 0 V to 2.5 V | ±10 V |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 5.9 µs | 5.9 µs | 5.9 µs | 5.9 µs | 5.9 µs |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Interface | Serial | Serial | Serial | Serial | Serial |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
Key Differentiators
- Integrated 8-channel multiplexer (vs AD7890ANZ-10)
- Small SOIC-24 package (vs AD7890ANZ-4)
- On-chip reference and track/hold (vs MAX1308)
Design Notes
The AD7890BR-4 operates from a single 5 V supply. It is recommended to decouple the VDD pin with a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor placed as close to the pin as possible. The analog and digital grounds should be connected at a single point to minimize noise. If the supply is noisy, an LC filter can be added.
For optimal performance, place the AD7890BR-4 on a PCB with a solid ground plane. Keep analog input traces short and shielded from digital signals. Use separate analog and digital ground planes if possible, and connect them at the device. Ensure that the reference output is bypassed with a 0.1 µF capacitor to ground.
A common mistake is exceeding the absolute maximum input voltage on the analog inputs. The AD7890BR-4 accepts 0 V to 4.096 V; applying voltages outside this range can damage the device. Also, ensure that the serial interface timing meets the specifications in the datasheet to avoid communication errors. The BUSY signal should be monitored to ensure conversions are complete before reading data.
Compliance Information
RoHS compliant per Analog Devices product page. Lead-free version is AD7890BRZ-4.
