AD7912AUJZ-REEL - 10-Bit 1MSPS 2-Ch SAR ADC | Analog Devices
MPN: AD7912AUJZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.2 | $420.00 |
| 500 | $3.6 | $1,800.00 |
| 1,000 | $3.05 | $3,050.00 |
AD7912AUJZ-REEL Overview
An SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm to digitize an analog input in N clock cycles for an N-bit result. SAR ADCs are favored over delta-sigma and pipeline types when designers need deterministic latency, low power consumption at moderate sample rates, and a small package. In the broader converter hierarchy, the SAR architecture sits between flash ADCs (faster, lower resolution) and delta-sigma ADCs (slower, higher resolution), making 10-12 bit 1 MSPS SARs a sweet spot for embedded data acquisition.
Key features of the AD7912AUJZ-REEL include a high-speed serial interface compatible with DSP, MICROWIRE, QSPI, and SPI, an on-chip low-noise wide-bandwidth track-and-hold amplifier, and an industry-standard successive-approximation architecture. The wide 2.35 V to 5.25 V supply range allows direct connection to 3.3 V or 5 V microcontrollers without level shifters. Power-down modes between conversions reduce average current to microampere levels for battery-powered applications.
The device uses a charge-redistribution DAC array and a comparator with a switched-capacitor front-end, achieving a typical INL of 0.5 LSB and excellent AC performance at 1 MSPS. The serial interface provides flexible data alignment and supports daisy-chain operation for multi-channel systems. Internal calibration and reference buffer design minimize the need for external components.
Typical applications include portable instrumentation, isolated data acquisition modules, battery monitoring, multi-cell battery cell measurement, optical sensor readout, and industrial process control. The combination of small TSOT-23 footprint and 1 MSPS throughput suits compact embedded designs.
When designing with this part, observe that the supply decoupling capacitors must be placed immediately at the VDD pin and the analog inputs must be driven from low-impedance sources to achieve specified linearity. Using a separate analog ground plane and routing digital signals away from analog traces improves noise immunity.
This page synthesizes distributor pricing, drop-in alternatives from the same Analog Devices ADC family, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for AD7912AUJZ-REEL — 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 AD7912AUJZ-REEL (same form factor and footprint) — differing in Architecture, Data Interface, Input Type, MSL Level, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7922AUJZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7912AUJZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7912WUJZ-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7922AUJZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7476BRTZ-REEL
✅ Drop-In✓ In Stock
$2.85 / Unit
View Datasheet →AD7912AUJZ-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Channels | 2 |
| Sampling Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage (VDD) | 2.35 V to 5.25 V |
| Nominal Supply Voltage | 3 V / 5 V |
| Power Consumption (typ @ 1 MSPS, 3 V) | 4.8 mW |
| Power Consumption (typ @ 1 MSPS, 5 V) | 15.5 mW |
| Data Interface | DSP, MICROWIRE, QSPI, Serial, SPI |
| Input Type | Single-ended, 2-channel mux |
| Package | TSOT-23-8 (UJ-8) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Packaging | Tape & Reel (REEL) |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
AD7912AUJZ-REEL Pin Configuration
| Pin 1 | VDD — Power supply input (2.35 V to 5.25 V) |
| Pin 2 | VIN1 — Analog input channel 1 |
| Pin 3 | VIN0 — Analog input channel 0 |
| Pin 4 | GND — Ground reference |
| Pin 5 | REF — Reference voltage input/output |
| Pin 6 | CS — Chip select (active low) |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | DOUT — Serial data output |
Typical Applications
AD7912AUJZ-REEL is suitable for 6 applications: Portable Battery Monitoring, Industrial Process Control Loops, Optical Sensor Readout, Isolated Data Acquisition Modules, Portable Instrumentation, Motor Control Position Feedback.
Portable Battery Monitoring
The AD7912AUJZ-REEL fits portable battery monitoring because its 2.35 V to 5.25 V wide supply input directly connects to single-cell Li-ion (3.0 V to 4.2 V) or multi-cell battery stacks without level shifters. Its 10-bit resolution at 1 MSPS is sufficient for voltage and current shunt measurements in battery management systems. The 4.8 mW typical power at 3 V and the integrated 2-channel input mux allow simultaneous pack-voltage and pack-current monitoring in a single TSOT-23-8 footprint. Power-down mode between conversions drops current to microamperes for duty-cycled battery-saving designs, and the SPI-compatible serial interface connects directly to battery-management microcontrollers.
Recommended
Industrial Process Control Loops
The AD7912AUJZ-REEL is well suited for industrial process control loops where 10-bit resolution at 1 MSPS provides adequate dynamic range for temperature, pressure, and flow sensor readout. The wide operating temperature range of -40 C to +85 C and the SPI-compatible serial interface allow direct connection to industrial microcontrollers and DSPs. The wide 2.35 V to 5.25 V supply range tolerates 24 V industrial bus transients after regulation. The deterministic SAR latency simplifies closed-loop control design, and the 2-channel input mux allows simultaneous reading of two related process variables (e.g., differential pressure) with a single ADC.
Recommended
Optical Sensor Readout
The AD7912AUJZ-REEL suits optical sensor readout applications including photodiode current measurement, ambient light sensing, and proximity detection. Its 1 MSPS throughput enables high-speed pulsed-light measurements needed for time-of-flight and LiDAR systems. The low 4.8 mW power consumption at 3 V keeps thermal noise low in temperature-sensitive optical paths. The small TSOT-23-8 footprint is ideal for compact sensor modules and the dual-channel input mux allows simultaneous readout of two optical detectors (e.g., reference and measurement channels) for differential optical measurements.
Recommended
Isolated Data Acquisition Modules
The AD7912AUJZ-REEL fits isolated data acquisition modules that interface to 4-20 mA loops, thermocouples, and other industrial sensors. Its SPI-compatible serial interface can be easily isolated with digital isolators or optocouplers, breaking ground loops and protecting downstream electronics from high-voltage transients. The 1 MSPS throughput handles most industrial sensor bandwidth requirements, and the 2.35 V to 5.25 V supply range allows isolated power from small DC-DC converters. The compact TSOT-23-8 footprint minimizes PCB area in DIN-rail mounted modules.
Recommended
Portable Instrumentation
The AD7912AUJZ-REEL is ideal for handheld multimeters, oscilloscope probes, and portable test equipment where board space is at a premium. Its TSOT-23-8 2.9 mm x 1.6 mm footprint occupies less PCB area than SOIC-8 alternatives, allowing higher channel density in handheld form factors. The 4.8 mW power at 3 V extends battery life in field-portable instruments, and the 1 MSPS throughput captures fast transients in digital multimeter auto-ranging and waveform digitizer applications. The wide 2.35 V to 5.25 V supply range accepts lithium primary cells, two AA cells, or USB-derived power rails.
Recommended
Motor Control Position Feedback
The AD7912AUJZ-REEL suits motor control position feedback applications including resolvers, Hall-effect sensors, and incremental encoder interfaces. The 1 MSPS throughput provides high-bandwidth feedback for BLDC servo drives, allowing sub-millisecond control loop update rates. The 2-channel input mux allows simultaneous reading of two feedback signals (e.g., resolver sine and cosine channels) for accurate angle computation. The deterministic SAR latency simplifies field-oriented control (FOC) implementation on the host DSP or microcontroller.
Recommended
Recommended Products Summary
Engineering reference data for AD7912AUJZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7922AUJZ-REEL | AD7912AUJZ-REEL7 | AD7912WUJZ-REEL | AD7922AUJZ-REEL7 | AD7476BRTZ-REEL |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | TSOT-23-8 (UJ-8) | TSOT-23-8 (UJ-8) - same | TSOT-23-8 (UJ-8) - same | TSOT-23-8 (UJ-8) - same | TSOT-23-8 (UJ-8) - same | TSOT-23-8 (RT-8) - pin-compatible footprint |
| Resolution | 10 bits | 12 bits | 10 bits | 10 bits | 12 bits | 12 bits |
| Sampling Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 1 |
| Supply Voltage | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V | 2.35 V to 5.25 V |
| Power @ 1 MSPS (3 V) | 4.8 mW | 4.8 mW | 4.8 mW | 4.8 mW | 4.8 mW | 3.6 mW |
| Automotive Grade (AEC-Q100) | No | No | No | Yes | No | No |
Key Differentiators
- Dual-channel input multiplexer in TSOT-23-8 footprint (vs AD7476BRTZ-REEL)
- AEC-Q100 automotive-qualified variant available (vs AD7912AUJZ-REEL (standard))
- Upgrade path to 12-bit resolution without PCB change (vs AD7922 family)
Design Notes
The AD7912AUJZ-REEL draws 4.8 mW typical at 1 MSPS with a 3 V supply. Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 1), with a 10 uF bulk capacitor nearby. For noise-sensitive applications, add a ferrite bead or pi-filter on the analog supply to filter digital switching noise from upstream regulators. Use a separate analog ground plane connected to the GND pin at a single point to avoid ground loops.
Route the analog inputs (VIN0, VIN1) with short traces and guard them with ground traces to minimize coupling from digital signals. Keep SCLK, CS, and DOUT traces away from analog traces or use a ground barrier between them. Place the reference capacitor directly at the REF pin with the shortest possible trace to minimize reference noise. For multi-channel designs, route each analog input symmetrically to the package to maintain matched channel characteristics.
Do not drive the analog inputs from high-impedance sources (>1 kohm) without an input buffer, as the ADC's switched-capacitor input draws transient charge and degrades linearity. Ensure the reference voltage is stable and low-noise; the ADC's noise performance scales with reference noise. When using the SPI interface, observe minimum SCLK timing parameters to avoid data corruption. Do not exceed VDD + 0.3 V on any analog input pin or latchup may occur.
Compliance Information
RoHS compliant per Analog Devices product page. The WUJZ variant is AEC-Q100 qualified for automotive use. Choose AD7912WUJZ-REEL for AEC-Q100 applications.
