AD7892BR-1 - 12-Bit 500kSPS Bipolar ADC | Analog Devices
MPN: AD7892BR-1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $60.62 | $60.62 |
| 10 | $56.1 | $561.00 |
| 100 | $48.5 | $4,850.00 |
| 500 | $42.8 | $21,400.00 |
| 1,000 | $38.9 | $38,900.00 |
AD7892BR-1 Overview
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a sampling data converter that performs bit-by-bit decision against an internal DAC to converge on the input voltage. In the broader taxonomy, the AD7892 sits as: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. SAR ADCs trade raw speed for deterministic latency and excellent DC accuracy, making them the dominant architecture for 12-/14-/16-bit precision instrumentation at sample rates from 100 kSPS to 10 MSPS.
Key features include ±17 V overvoltage protection on analog inputs (AD7892-1/2/3 variants), single-supply +5 V operation, an on-chip 2.5 V reference (or external reference option), choice of parallel 12-bit word or serial data output formats, and low power consumption of approximately 60 mW typical at 500 kSPS. The bipolar input stage on AD7892-1 extends usable dynamic range for industrial transducer signals that swing around ground.
Architecturally, the AD7892BR-1 combines a high-impedance input attenuator, a fast track/hold, the SAR core clocked by an internal oscillator, and an internal 2.5 V bandgap reference. The single-supply bipolar topology uses input resistor scaling and level shifting so that the internal ADC core always sees a 0 V to 2.5 V (or 0 V to 5 V) unipolar signal — a classic Analog Devices LC2MOS approach that predates modern pin-compatible CMOS ADCs.
Typical applications include industrial process control data acquisition, motor control current/voltage sensing, instrumentation front-ends, and medical monitoring signal chains where bipolar ±10 V inputs must be digitized directly without external signal conditioning. It is also used in test-and-measurement equipment and DSP front-end digitization.
When designing with the AD7892BR-1, ensure the analog input is properly buffered because the input attenuator presents a relatively high source impedance that interacts with sample-rate-dependent acquisition time. Decouple VDD with 10 µF tantalum in parallel with 100 nF ceramic placed within 5 mm of the supply pin; do not share digital and analog ground returns under the package.
This page synthesizes distributor pricing and cross-reference findings not presented in the datasheet, focusing on practical guidance rather than parameter repetition.
Drop-in alternatives for AD7892BR-1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD7892BR-1 (same form factor and footprint) — differing in Architecture, Conversion Time, Package, RoHS Status, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7892BRZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7892ARZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7892AR-1
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →AD7892BR-2
✅ Drop-In📋 Reference alternative (not in catalog)
AD7892BRZ-2
✅ Drop-In📋 Reference alternative (not in catalog)
AD7892ANZ-1
✅ Drop-In📋 Reference alternative (not in catalog)
AD7892BR-1 Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Channels | 1 |
| Sampling Rate | 500 kSPS |
| Conversion Time | 1.47 µs |
| Supply Voltage | +5 V single supply |
| Input Range (AD7892-1) | True bipolar ±10 V or ±5 V |
| Input Range (AD7892-2) | 0 V to +5 V |
| Input Range (AD7892-3) | ±2.5 V (true bipolar) |
| Overvoltage Protection (AD7892-1/3) | ±17 V (AD7892-1), ±7 V (AD7892-3) |
| Architecture | SAR (Successive Approximation) |
| Reference Type | Internal 2.5 V or external |
| Data Interface | Parallel (12-bit word) or Serial |
| Track/Hold Amplifier | On-chip |
| Input Type | Single-Ended (true bipolar on -1/-3) |
| Operating Temperature | -40°C to +85°C |
| Package | 24-SOIC W (0.295", 7.5 mm width) |
| Mounting Type | Surface Mount |
| RoHS Status | Non-RoHS (BR suffix indicates matte tin / non-LEAD-FREE). Use AD7892BRZ-1 for Pb-free. |
AD7892BR-1 Pin Configuration
| Pin 1 | DB11/MSB — Data Bit 11 (MSB) in parallel mode; MSB/Format select in serial mode |
| Pin 2 | DB10 — Data Bit 10 |
| Pin 3 | DB9 — Data Bit 9 |
| Pin 4 | DB8 — Data Bit 8 |
| Pin 5 | DB7 — Data Bit 7 |
| Pin 6 | DB6 — Data Bit 6 |
| Pin 7 | DB5 — Data Bit 5 |
| Pin 8 | DB4/SCLK — Data Bit 4 in parallel; Serial Clock output in serial mode |
| Pin 9 | DB3 — Data Bit 3 |
| Pin 10 | DB2 — Data Bit 2 |
| Pin 11 | DB1/LSB — Data Bit 1 (LSB) in parallel; LSB in serial mode |
| Pin 12 | DGND — Digital ground |
| Pin 13 | AGND — Analog ground |
| Pin 14 | VDD — +5 V supply |
| Pin 15 | EOC — End-of-conversion status output |
| Pin 16 | CONVST — Conversion start input |
| Pin 17 | CS — Chip select (active low) |
| Pin 18 | REF OUT/REF IN — Internal +2.5 V reference output / external reference input |
| Pin 19 | VIN+ — Analog input (positive) — bipolar ±10 V or ±5 V on AD7892-1 |
| Pin 20 | VIN- — Analog input (negative / AGND sense) — bipolar input return |
| Pin 21 | MODE — Interface mode select (parallel or serial) |
| Pin 22 | RANGE — Input range select — selects ±10 V or ±5 V bipolar on -1 variant |
| Pin 23 | STBY — Standby / power-down control (active low) |
| Pin 24 | DOUT — Serial data output (used in serial mode) |
Typical Applications
AD7892BR-1 is suitable for 6 applications: Industrial Process Control Data Acquisition, Motor Control Current and Voltage Sensing, Medical Monitoring Signal Acquisition, Test and Measurement Instrumentation, DSP Front-End Digitization, Data Acquisition Plug-in Cards (PCI/ISA/PC/104).
Industrial Process Control Data Acquisition
The AD7892BR-1 is well-suited to industrial process-control front-ends because its true bipolar ±10 V or ±5 V input range (AD7892-1 variant) accepts ±10 V transducer signals directly, eliminating external signal conditioning. With 12-bit resolution, 500 kSPS throughput, and ±17 V overvoltage protection per the datasheet, it digitizes 4-20 mA-derived shunt voltages, thermocouple-amplified outputs, and strain-gauge bridge signals with 1.47 µs conversion latency. The 24-SOIC wide-body package provides robust thermal performance for DIN-rail-mounted backplanes; the internal 2.5 V reference eliminates one external component on the BOM. This is recommended wherever a single +5 V rail must digitize legacy industrial ±10 V signals.
Recommended
Motor Control Current and Voltage Sensing
In 3-phase motor control loops the AD7892BR-1's 1.47 µs conversion time enables sampling of shunt-resistor current signals and DC-bus voltages within the PWM switching window. The true bipolar input accepts ±10 V or ±5 V directly from Hall-effect current transducers without level shifting. With 500 kSPS throughput and parallel interface, the ADC reads all three phase currents plus DC-bus voltage inside a single 100 µs control period at 10 kHz PWM. The 24-SOIC wide-body package dissipates the ~60 mW power budget comfortably across -40 to +85 °C operating range typical of industrial drives.
Recommended
Medical Monitoring Signal Acquisition
Patient-monitoring equipment benefits from the AD7892BR-1's 12-bit resolution at 500 kSPS to digitize ECG, EEG, and pulse-oximeter waveforms with adequate dynamic range for diagnostic bandwidth. The bipolar ±5 V input range (selectable input variant) captures physiological signals that swing around a virtual ground, removing the need for level-shift stages in the analog front-end. Single +5 V operation simplifies medical-device power trees certified to IEC 60601-1. The on-chip track/hold and internal 2.5 V reference reduce component count, an advantage in size-constrained patient-worn designs.
Recommended
Test and Measurement Instrumentation
Bench-top digital multimeters, data loggers, and oscilloscope digitizer front-ends use the AD7892BR-1 to convert bipolar transducer signals in the ±10 V or ±5 V range. The 500 kSPS throughput supports sampling rates typical of mid-band waveform recorders; the 12-bit resolution provides 0.024% full-scale LSB granularity. The parallel interface permits the captured waveform to be transferred to a DSP or FPGA in a single read cycle, keeping overhead low. Built-in overvoltage protection (±17 V on -1 variant) shields the ADC input from inadvertent out-of-range signals present on the test fixture.
Recommended
DSP Front-End Digitization
The AD7892BR-1 is widely used as a parallel-output ADC feeding DSPs such as the ADSP-218x/219x family for closed-loop control and audio-bandwidth signal processing. The 12-bit parallel word is read in a single memory-mapped access cycle, removing DMA latency. 500 kSPS throughput captures audio-band signals up to ~200 kHz with margin. The internal 2.5 V reference and single +5 V supply eliminate multi-rail power designs. The wide 24-SOIC package is easy to lay out for noise-sensitive grounds, with separate AGND and DGND pins enabling star-ground PCB topologies.
Recommended
Data Acquisition Plug-in Cards (PCI/ISA/PC/104)
Multi-channel PC-based DAQ cards (PC/104, ISA, PCI) historically paired the AD7892BR-1 with 8-channel analog multiplexers and isolated front-ends for ±10 V or ±5 V industrial I/O. The 500 kSPS throughput is sufficient for vibration analysis, acoustic monitoring, and industrial control loops. The 24-SOIC wide package delivers solid mechanical reliability on the through-mixed-signal PCB, while the parallel interface bus-reads seamlessly to legacy 16-bit ISA bus controllers. For new designs, the AD7892BRZ-1 Pb-free variant ensures RoHS compliance for global product launches.
Recommended
Recommended Products Summary
Engineering reference data for AD7892BR-1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7892BRZ-1 | AD7892ARZ-1 | AD7892BR-2 |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-SOIC W | 24-SOIC W | 24-SOIC W | 24-SOIC W |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Input Range | True bipolar ±10 V or ±5 V | True bipolar ±10 V or ±5 V | True bipolar ±10 V or ±5 V | 0 V to +5 V unipolar |
| Overvoltage Protection | ±17 V | ±17 V | ±17 V | ±17 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +105 °C | -40 °C to +85 °C |
| Lead Finish / RoHS | Matte tin / non-RoHS | Pb-free / RoHS | Pb-free / RoHS | Matte tin / non-RoHS |
| Reference | Internal +2.5 V or external | Internal +2.5 V or external | Internal +2.5 V or external | Internal +2.5 V or external |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single |
| Conversion Time | 1.47 µs | 1.47 µs | 1.47 µs | 1.47 µs |
Key Differentiators
- True bipolar ±10 V or ±5 V input range directly digitized (vs AD7892BR-2 (0 V to +5 V unipolar))
- ±17 V overvoltage protection on analog inputs (vs Modern CMOS ADCs without OVP)
- Single +5 V supply operation (vs Older bipolar ADCs requiring ±15 V and +5 V)
Design Notes
Place a 10 µF tantalum capacitor in parallel with a 100 nF ceramic capacitor within 5 mm of the VDD pin (pin 14) to decouple the high-speed SAR logic and on-chip reference. Route AGND (pin 13) and DGND (pin 12) to a single-point star ground near the device, not under the package. The bipolar input attenuator requires a clean analog ground reference; avoid running digital return currents under the SOIC body.
The AD7892BR-1 input is a relatively high source impedance (~kΩ range) due to the bipolar input attenuator. Driving it directly from a high-impedance op-amp output degrades linearity at full 500 kSPS throughput. Buffer with a precision low-offset, low-output-impedance amplifier such as the AD8676 or AD797 within 50 mm of the ADC inputs to preserve 12-bit performance. Do not share the input buffer between channels if multiplexing — each channel needs its own buffer to avoid crosstalk.
Typical supply current is approximately 12 mA (~60 mW power dissipation) at 500 kSPS with +5 V supply. With standby (STBY low) current drops to ~5 µA typical, enabling battery-backed industrial applications. If the application uses STBY for power cycling, allow 10 µs wake-up time before initiating a CONVST — the internal reference and track/hold need to settle. Using the internal 2.5 V reference without external buffering is acceptable for 12-bit performance; for critical DC applications add an external 2.5 V reference such as the ADR381.
The parallel interface generates 13 simultaneous CMOS edges (12 data bits + EOC) during read, producing significant ground bounce if DGND is not isolated. On 24-SOIC layouts, place a guard ring of DGND-trace between data bus traces and the analog section, and use 22-33 Ω series-termination resistors on the data outputs (DB0-DB11) when read by buses longer than 50 mm. Tie any unused data outputs (in serial mode) to logic low to avoid floating CMOS inputs that can inject noise into the substrate.
Compliance Information
AD7892BR-1 (BR suffix) uses matte tin (SnPb-free but Sn finish) and is NOT RoHS-compliant under the 2011/65/EU directive. For RoHS-compliant designs, choose the AD7892BRZ-1 (Z suffix) which uses Pb-free plating. Both parts share the same die and pinout. REACH compliance is maintained (no SVHC declarable substances). AEC-Q100 automotive qualification is NOT available on the BR-1 standard industrial version.
