AD7893BRZ-2REEL7 - 12-Bit SAR ADC, Serial, 8-SOIC | ADI
MPN: AD7893BRZ-2REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.2 | $14.20 |
| 10 | $12.78 | $127.80 |
| 100 | $10.12 | $1,012.00 |
| 500 | $8.55 | $4,275.00 |
| 1,000 | $7.1 | $7,100.00 |
AD7893BRZ-2REEL7 Overview
What is a SAR ADC? A successive-approximation register analog-to-digital converter is a precision data-converter architecture that performs one bit at a time using an internal DAC and comparator, trading slightly slower conversion speed for high resolution, low power consumption, deterministic latency, and compact die area. SAR ADCs sit at the bottom of the precision-converter hierarchy - below pipelined and sigma-delta ADCs - and are widely used in industrial process control, data acquisition, instrumentation, motor control, and battery-powered sensor readouts where predictable latency and modest sample rates (10 kSPS to 1 MSPS) are required.
Key headline specifications include 12-bit resolution, a true bipolar or unipolar input range (this -2 grade is unipolar 0 V to +5 V / +/-5 V/-10 V option family), 117 kSPS throughput, 6 us conversion time, 5 V single-supply operation, low 25 mW typical power dissipation, and a high-speed serial data port. The on-chip track/hold eliminates the need for an external sample-and-hold, while the integrated oscillator removes the requirement for an external clock source, simplifying board layout and BOM cost.
The AD7893 is fabricated in Analog Devices' LC2MOS mixed-signal process, which combines precision bipolar input structures with low-power CMOS logic. The bipolar input stage delivers the dc accuracy and low-noise sampling behavior that characterize ADI's precision ADC portfolio, while the CMOS logic keeps digital power and digital-induced ground bounce manageable. The result is a small-footprint converter that competes favorably against discrete ADC + op-amp + reference + clock designs in cost-sensitive applications.
Typical applications include industrial process control loops, multi-channel data-acquisition front-ends, motor-speed and position feedback, battery management monitoring, portable instrumentation, and point-of-load monitoring inside power-conversion systems. Designers benefit from the part's small 8-pin package when PCB real estate is at a premium.
When designing with this device, follow a standard SAR decoupling scheme with a 0.1 uF ceramic bypass capacitor at the VDD pin and an optional 10 uF bulk capacitor on the analog supply rail to suppress digital switching transients. Keep the analog input traces short and guarded because the input bandwidth of the on-chip track/hold is limited. Drive the SCLK and CONVST signals with clean digital logic to avoid corrupting the conversion result.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical decoupling/layout notes that go beyond what is found in the Analog Devices AD7893 datasheet alone.
Drop-in alternatives for AD7893BRZ-2REEL7 — 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 AD7893BRZ-2REEL7 (same form factor and footprint) — differing in Conversion Time, Architecture, Converter Type, Data Interface, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7893BRZ-2REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7893BRZ-10REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7893ARZ-10REEL
✅ Drop-In✓ In Stock
$15.04 / Unit
View Datasheet →AD7893AR-10REEL
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →AD7893BR-2REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7893BRZ-2REEL7 Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 |
| Sampling Rate (Per Second) | 117 kSPS |
| Conversion Time | 6 us |
| Number of Inputs | 1 |
| Input Type | Single-ended (Pseudo-bipolar, -2 grade) |
| Data Interface | Serial (2-wire high-speed) |
| Architecture | SAR (Successive Approximation) |
| Number of A/D Converters | 1 |
| Reference Type | External (not included) |
| Supply Voltage (Analog and Digital) | +5 V single supply |
| Power Dissipation (Typical) | 25 mW |
| Operating Temperature Range | -40C to +85C (industrial) |
| Package / Case | 8-SOIC (0.154", 3.90 mm width) |
| Mounting Type | Surface Mount |
| Packaging | Tape & Reel (TR), 7-inch reel |
| MSL Level | 1 (per Analog Devices standard, JEDEC J-STD-020) |
| RoHS Status | Compliant (Pb-free, indicated by 'Z' designator) |
| On-Chip Track/Hold | Yes |
| On-Chip Clock | Yes |
AD7893BRZ-2REEL7 Pin Configuration
| Pin 1 | VIN — Analog input (+/-5 V or +/-10 V or 0-5 V input range, grade dependent) |
| Pin 2 | AGND — Analog ground (return for VIN and reference) |
| Pin 3 | REF — External reference input (decouple to AGND with 0.1 uF ceramic) |
| Pin 4 | VDD — +5 V analog and digital supply (decouple with 0.1 uF + 10 uF bulk) |
| Pin 5 | GND — Digital ground (return for serial interface) |
| Pin 6 | CONVST — Conversion start input (falling edge initiates conversion) |
| Pin 7 | SCLK — Serial interface clock (also used to read conversion result) |
| Pin 8 | SDATA — Serial data output (presents 12-bit conversion result) |
Typical Applications
AD7893BRZ-2REEL7 is suitable for 6 applications: Industrial Process Control Loops, Data-Acquisition Front-Ends, Motor-Speed and Position Feedback, Battery Management Monitoring, Portable Instrumentation, Point-of-Load Power Monitoring.
Industrial Process Control Loops
The AD7893BRZ-2REEL7's 12-bit resolution and 117 kSPS throughput match the speed and accuracy needs of slow-to-medium control loops such as temperature, pressure and flow controllers found in PLC and DCS systems. Its -40C to +85C industrial temperature range and 8-SOIC compact footprint allow it to be placed next to sensors on small analog front-end cards, and the serial output port can be daisy-chained to an MCU SPI or bit-banged GPIO for low-pin-count host connections. The on-chip track/hold removes the need for an external SHA, reducing BOM cost in dense multi-channel cards.
Recommended
Data-Acquisition Front-Ends
In multi-channel DAQ cards where one ADC is muxed across many analog inputs, the AD7893BRZ-2REEL7 provides a compact, low-power quantization stage. The 6 us conversion time supports per-channel settling within typical 100 us mux switching windows, and the 12-bit dynamic range is well matched to 10 V industrial signal levels when paired with a front-end resistor divider. Designers running Linux or RTOS hosts can poll the serial SDATA line via SPI for high-speed transfers, and the part's 25 mW dissipation keeps the card's total thermal budget manageable in dense 16-/32-channel cards.
Recommended
Motor-Speed and Position Feedback
Closed-loop motor control requires deterministic-latency conversion of current and position sensor signals, and the SAR architecture of the AD7893BRZ-2REEL7 provides exactly that - one sample per conversion command with no pipeline delay. The 117 kSPS sample rate captures quadrature-encoder-derived analog velocity signals up to about 8 kHz with comfortable margin, and the 12-bit resolution yields about 0.024 percent full-scale resolution suitable for torque-loop control of fractional-horsepower servos. Mounted near the power stage, the SOIC package survives the thermal environment thanks to its industrial -40C to +85C rating.
Recommended
Battery Management Monitoring
Inside multi-cell battery management systems, the AD7893BRZ-2REEL7's 25 mW typical dissipation extends battery runtime in portable packs while its single +5 V supply simplifies the analog rail derived from the pack. The 12-bit dynamic range covers 1 mV resolution on a 0-4 V cell-sense input, sufficient for coulomb-counting and cell-balancing decision circuits. The 8-SOIC small footprint allows it to be placed directly on each cell-monitor board, and the serial interface avoids tying up many GPIO pins on the supervising MCU.
Recommended
Portable Instrumentation
Hand-held multimeters, signal analyzers and field-service instruments rely on the AD7893BRZ-2REEL7's low power dissipation (25 mW) and small SOIC footprint to extend battery life and shrink the device enclosure. With its 6 us conversion time the part supports real-time waveform capture on slow signals, and the integrated track-and-hold removes the analog front-end leakage problem found in discrete SHA + ADC designs. The 12-bit resolution provides 0.025 percent full-scale accuracy suitable for 4-1/2-digit display readings without oversampling.
Recommended
Point-of-Load Power Monitoring
Modern DC-DC converters and POL regulators require onboard telemetry of output voltage and current; placing the AD7893BRZ-2REEL7 next to the inductors and MOSFETs gives a compact 12-bit quantizer for closed-loop digital control loops. Its serial interface is independent of the switching node frequency, so the ADC reads are not contaminated by switching noise when proper star-grounding is observed, and its 117 kSPS sample rate matches typical 100 us POL control update intervals. Designers can read two POLs in parallel by assigning separate enable lines per ADC.
Recommended
Recommended Products Summary
Engineering reference data for AD7893BRZ-2REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7893BRZ-2REEL | AD7893BRZ-10REEL7 | AD7893ARZ-10REEL | AD7893AR-10REEL | AD7893BR-2REEL7 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-SOIC | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | PDIP-8 | PDIP-8 |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS | 117 kSPS |
| Input Voltage Range | 0 V to 5 V (unipolar, -2 grade) | 0 V to 5 V (unipolar) | +/-10 V (bipolar, -10 grade) | +/-10 V (bipolar, -10 grade) | +/-10 V (bipolar, -10 grade) | 0 V to 5 V (unipolar) |
| Data Interface | Serial (2-wire) | Serial (2-wire) | Serial (2-wire) | Serial (2-wire) | Serial (2-wire) | Serial (2-wire) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Power Dissipation | 25 mW typical | 25 mW typical | 25 mW typical | 25 mW typical | 25 mW typical | 25 mW typical |
| On-Chip Track/Hold | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Same die across all package/reel options (vs AD7893BRZ-2REEL)
- Integrated track/hold and on-chip clock (vs AD7893AR-10REEL (PDIP variant))
- Single +5 V supply operation (vs AD7893BRZ-10REEL7)
Design Notes
Place a 0.1 uF X5R/X7R ceramic bypass capacitor as close as physically possible to the VDD pin (pin 4) with a 10 uF bulk aluminum-polymer or tantalum capacitor within one inch, all referenced to GND. The AD7893BRZ-2REEL7's internal clock and serial logic draw transient current during each conversion and digital readout; insufficient decoupling will couple digital switching transients into the analog track/hold and corrupt low-level conversions. Use a star-ground topology with separate analog (AGND) and digital (GND) traces returning to the regulator's local-sense pin to avoid ground-loop coupling. The 'Z' suffix confirms lead-free / Pb-free construction so use 260C reflow profiles per JEDEC J-STD-020.
Keep the analog VIN trace (pin 1) short and guarded, since the on-chip track/hold has limited input bandwidth. Place the external reference (REF, pin 3) decoupling 0.1 uF capacitor directly at the pin, and avoid running any digital traces (SCLK, SDATA, CONVST) parallel to VIN or REF for more than a few millimeters. The 8-SOIC exposed-pad variant is not used in this part; route the SOIC ground traces on the top layer to maximize the GND plane area under the package, which doubles as a partial thermal spreader. For multi-layer boards, stitch the analog and digital grounds together only at the regulator's ground pin, never near the ADC, to avoid digital return currents polluting the analog reference.
Do not drive the SDATA line with the AD7893BRZ-2REEL7 during power-up; the serial output is high-impedance for the first few microseconds and a floating line can be misinterpreted by the host MCU as a start bit. Hold CONVST high during power-up to prevent spurious conversions. Be careful to enter and exit the calibration/reset state via the documented sequence in the datasheet - skipping this step leaves the ADC uncalibrated and yields large offset errors. Finally, verify the SCLK rise/fall times versus the datasheet timing diagram; many MCUs default to weaker slew rates that violate the minimum timing margin in noisy environments.
Compliance Information
Lead-free Pb-free construction confirmed by Z designator in part number per Analog Devices naming convention; RoHS compliance per manufacturer data sheet. AEC-Q100 qualification is not applicable to this industrial-grade (not automotive) ADC. Halogen-free status not explicitly stated in retrieved data.