AD7476ARTZ-REEL - 12-Bit 1MSPS SAR ADC SOT-23-6 | ADI
MPN: AD7476ARTZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.68 | $46.80 |
| 100 | $4.16 | $416.00 |
| 500 | $3.74 | $1,870.00 |
| 1,000 | $3.32 | $3,320.00 |
AD7476ARTZ-REEL Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses a binary-search algorithm against an internal DAC to convert an analog input to a digital code in N clock cycles for N-bit resolution. In the broader signal-chain taxonomy, SAR ADCs sit between flash converters (fastest, lowest resolution) and sigma-delta ADCs (slowest, highest resolution), making them the optimal choice when an application needs single-cycle latency, moderate-to-high speed, and 8-16 bit resolution. The AD7476 belongs to the data-converter hierarchy: ADC -> SAR ADC -> 12-bit ADC -> low-power precision ADC, and is widely used as a system-side companion to microcontroller ADCs when higher speed or accuracy is required.
Key features include flexible power/serial-clock-speed management that scales consumption with throughput, a high-speed serial interface compatible with SPI/QSPI/MICROWIRE/DSP, pseudo-differential analog input referenced to GND, and an operating temperature range of -40C to +85C. The 1 MSPS throughput makes the part suitable for multiplexed multi-channel systems where channels are scanned in sequence.
Typical applications include portable and battery-powered instrumentation, industrial process control loops, optical module monitoring, motor-control current sensing, and data-acquisition front-ends. Designers benefit from the part's small SOT-23-6 footprint when board real estate is constrained, and from its 3.6 mW dissipation when thermal or battery budgets are tight.
When designing with this ADC, budget for at least 3 acquisition-clock cycles before conversion starts to settle the track-and-hold fully, and place the 0.1 uF decoupling capacitor as close as possible to the VDD pin to preserve SNR. Average supply current scales linearly with throughput, so the part is equally well-suited to high-speed burst sampling and continuous low-rate conversion. This page synthesizes distributor stock, parametric drop-in alternatives, and practical SOT-23 layout guidance beyond the manufacturer datasheet.
Drop-in alternatives for AD7476ARTZ-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 AD7476ARTZ-REEL (same form factor and footprint) — differing in Lead-Free / RoHS, Package, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7476ARTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7476ARTZ-500RL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7477ARTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7478ARTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADS7042IDBVR
✅ Drop-In📋 Reference alternative (not in catalog)
AD7476ARTZ-REEL Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Throughput Rate | 1 MSPS |
| Input Type | Pseudo-Differential (referenced to GND) |
| Supply Voltage Range | 2.35 V to 5.25 V |
| Power Dissipation (3 V, 1 MSPS) | 3.6 mW typical |
| Power Dissipation (5 V, 1 MSPS) | 15 mW typical |
| SNR at 100 kHz Input | 70 dB |
| Input Bandwidth (Track-and-Hold) | Greater than 6 MHz |
| Digital Interface | Serial (SPI/QSPI/MICROWIRE/DSP compatible) |
| Operating Temperature Range | -40C to +85C |
| Package | SOT-23-6 (6-lead) |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Yes (compliant) |
| Input Voltage Range | 0 V to VDD (pseudo-differential) |
AD7476ARTZ-REEL Pin Configuration
| Pin 1 | VDD — Power supply input (2.35 V to 5.25 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | VIN — Analog input (pseudo-differential, 0 V to VDD) |
| Pin 4 | DOUT — Serial data output (SPI-compatible) |
| Pin 5 | SCLK — Serial clock input |
| Pin 6 | CS — Chip-select / conversion start input (active low) |
Typical Applications
AD7476ARTZ-REEL is suitable for 6 applications: Battery-Powered Portable Instrumentation, Optical Module Monitoring, Industrial Process Control Loops, Motor Control Current Sensing, Data-Acquisition Front End for Embedded Systems, Medical and Health Monitoring Devices.
Battery-Powered Portable Instrumentation
The AD7476ARTZ-REEL's 3.6 mW dissipation at 1 MSPS (3 V supply) and linear power-vs-throughput scaling make it well suited to battery-powered data loggers and handheld multimeters. The 1 MSPS throughput supports high-speed transient capture while the part's idle current is near-zero, so a microcontroller can idle most of the time and burst-sample when needed. The SOT-23-6 footprint fits inside very small enclosures, freeing space for the battery and display.
Recommended
Optical Module Monitoring
Optical transceivers and tunable laser modules require monitoring of bias current, temperature, and received signal strength - all of which are slow-changing analog signals. The AD7476ARTZ-REEL handles these housekeeping channels with 12-bit accuracy and 1 MSPS throughput, more than enough for thermal control loops. Its 2.35-5.25 V supply range matches common 3.3 V optical-module rails and its SPI interface is FPGA-friendly for line-card designs.
Recommended
Industrial Process Control Loops
PLC analog input modules and 4-20 mA loop-powered sensor conditioners feed multiple channels into a single ADC through a multiplexer. The AD7476ARTZ-REEL's 1 MSPS throughput allows a multiplexer to scan 4-8 channels in real time at 100 kHz each while delivering 12-bit accuracy. Its pseudo-differential input referenced to GND simplifies PCB layout, and the 5 V supply option supports classic industrial 24 V-bus-derived rails after regulation.
Recommended
Motor Control Current Sensing
Field-oriented control of brushless DC and permanent-magnet motors requires sampling phase currents at 10-20 kHz with sub-millisecond latency. The AD7476ARTZ-REEL's single-cycle latency SAR architecture provides determinism that sigma-delta ADCs cannot, while 1 MSPS throughput handles two or three phase currents with margin. The 3.6 mW dissipation at 3 V is negligible in a typical motor drive, and the SOT-23-6 footprint fits next to each half-bridge.
Recommended
Data-Acquisition Front End for Embedded Systems
Embedded MCUs often need a faster or higher-resolution ADC than the internal 10/12-bit SARs. The AD7476ARTZ-REEL provides an external 12-bit 1 MSPS ADC that interfaces to the SPI bus of any modern MCU with minimal glue logic. Designers use the part as a 'front-end' digitiser for audio-bandwidth signals, accelerometers, and strain gauges where the MCU's internal ADC lacks bandwidth or dynamic range.
Recommended
Medical and Health Monitoring Devices
Patient monitors, pulse oximeters, and wearable health bands digitise low-frequency biopotential signals at 100-500 Hz. The AD7476ARTZ-REEL provides far more bandwidth than needed, which means oversampling can effectively raise the SNR by 1-2 bits for cleaner ECG and SpO2 traces. Its low 3.6 mW dissipation and small SOT-23-6 footprint support wearable form factors, while the 2.35 V minimum supply works with single-cell Li-ion batteries.
Recommended
Recommended Products Summary
Engineering reference data for AD7476ARTZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7476ARTZ-REEL7 | AD7476ARTZ-500RL7 | AD7477ARTZ-REEL7 | AD7478ARTZ-REEL7 | ADS7042IDBVR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | SOT-23-6 | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same | SOT-23-6 - same |
| Resolution | 12 bits | 12 bits | 12 bits | 10 bits | 8 bits | 12 bits |
| Throughput | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Supply Voltage Range | 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 | 1.6 V to 3.6 V |
| Input Type | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential |
| Interface | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI/QSPI/MICROWIRE/DSP | SPI (different mode/polarity - verify) |
Key Differentiators
- Smallest-footprint 12-bit 1 MSPS SAR ADC in production (vs AD7983BCPZ-R2)
- Wide 2.35 V to 5.25 V single supply supports 3.3 V and 5 V MCU families (vs ADS7042IDBVR)
- Family drop-in compatibility across 12/10/8-bit resolutions (vs AD7477ARTZ-REEL7 / AD7478ARTZ-REEL7)
Design Notes
Place a 0.1 uF decoupling capacitor within 5 mm of the VDD pin and a 10 uF bulk capacitor at the supply's entry point. Keep the analog input trace short and surrounded by ground pour; the track-and-hold amplifier's 6 MHz bandwidth makes the VIN trace susceptible to digital switching noise. Route SCLK, DOUT, and CS away from the analog input to avoid digital feedthrough corrupting the LSB.
Supply current is linearly proportional to throughput - at 100 kSPS the part draws roughly 0.36 mW at 3 V, enabling aggressive duty-cycling in battery systems. Provide 3 acquisition-clock cycles between conversions to fully settle the track-and-hold; failure to do so can cost 1-2 LSBs of accuracy at full throughput.
Source impedance above 500 ohm on VIN degrades THD and SNR - add an op-amp buffer if the source cannot drive this load directly. In pseudo-differential mode, ground-plane noise couples into the input directly; for precision applications use true-differential parts or differential input pairs (AD7450ARZ-REEL family) instead. Confirm the SPI mode on the MCU side: the AD7476 outputs data on SCLK rising edges and reads CS on falling edge.
Compliance Information
RoHS and lead-free per Analog Devices product page. AEC-Q100 not applicable for this commercial-grade ADC; automotive applications should consider AD7476ARTZ-REEL7 with extended temperature screening.
