ADS8471IBRGZR - 16-Bit 1MSPS SAR ADC w/ Internal Ref | TI
MPN: ADS8471IBRGZR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.9 | $4,450.00 |
| 1,000 | $7.95 | $7,950.00 |
| 3,000 | $6.8 | $20,400.00 |
ADS8471IBRGZR Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter - a precision data-converter topology that uses a binary-search algorithm against an internal DAC to resolve each conversion in N clock cycles for N bits of resolution. SAR ADCs offer deterministic latency, low power, and excellent DC accuracy with no pipeline delay, which is why the SAR topology dominates in industrial process control, precision instrumentation, and battery-powered data-acquisition applications.
Key features include 1 MSPS throughput, 16-bit no-missing-codes resolution, an internal low-drift 4.096-V reference, pseudo-bipolar inputs up to +/-4.096 V or 0 to 4.096 V unipolar operation, parallel 16-bit or byte-wide 8-bit interface, and industrial -40C to +85C operating range. The integrated reference eliminates an external component, simplifies BOM, and improves temperature stability.
The SAR core uses a charge-redistribution DAC architecture with internal calibration, achieving excellent linearity and low THD. The internal 4.096-V reference is low-drift and provides a ratiometric reference for the input signal chain.
Typical applications include industrial process control PLC analog input modules, multichannel data-acquisition systems, precision instrumentation and test equipment, optical encoder feedback loops, and medical imaging front-ends. The wide analog input range accommodates 5-V or +/-5-V industrial transducer signals directly.
When designing with this device, place the decoupling capacitors as close to the AVDD and DVDD pins as possible and follow the datasheet reference-driver layout to avoid reference noise coupling into the conversion result. Use the BYTE mode pin to simplify connection to 8-bit microcontrollers and ensure the BUSY/INT signal is monitored to avoid read contention.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone TI datasheet document.
Drop-in alternatives for ADS8471IBRGZR — 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 ADS8471IBRGZR (same form factor and footprint) — differing in Package, Input Type, Resolution, Sample Rate, Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8481IRGZR
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View Datasheet →ADS8471IBRGZR Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Sample Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 |
| Input Type | Pseudo-Bipolar, Unipolar Single-Ended |
| Internal Reference | 4.096 V |
| Input Voltage Range | 0 V to 4.096 V (unipolar) / +/-4.096 V (pseudo-bipolar) |
| Output Interface | Parallel 16-bit or 8-bit byte-wide (2 read cycles) |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Package | 48-VQFN (RGZ) 7x7 mm |
| Pin Count | 48 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADS8471IBRGZR Pin Configuration
| Pin 1 | AVDD — Analog supply voltage |
| Pin 2 | AGND — Analog ground |
| Pin 3 | REF — Internal 4.096 V reference output / bypass |
| Pin 4 | IN+ — Positive analog input |
| Pin 5 | IN- — Negative analog input (pseudo-bipolar) |
| Pin 6 | AGND — Analog ground |
| Pin 7 | AVDD — Analog supply voltage |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | RD — Read strobe (active low) |
| Pin 10 | BUSY/INT — Conversion busy / interrupt output |
| Pin 11 | BYTE — Bus mode select (16-bit or 8-bit) |
| Pin 12 | DVDD — Digital supply voltage |
| Pin 13 | DGND — Digital ground |
| Pin 14 | DB0 — Data bit 0 (LSB) |
| Pin 15 | DB1 — Data bit 1 |
| Pin 16 | DB2 — Data bit 2 |
| Pin 17 | DB3 — Data bit 3 |
| Pin 18 | DB4 — Data bit 4 |
| Pin 19 | DB5 — Data bit 5 |
| Pin 20 | DB6 — Data bit 6 |
| Pin 21 | DB7 — Data bit 7 |
| Pin 22 | DB8 — Data bit 8 |
| Pin 23 | DB9 — Data bit 9 |
| Pin 24 | DB10 — Data bit 10 |
| Pin 25 | DB11 — Data bit 11 |
| Pin 26 | DB12 — Data bit 12 |
| Pin 27 | DB13 — Data bit 13 |
| Pin 28 | DB14 — Data bit 14 |
| Pin 29 | DB15 — Data bit 15 (MSB) |
| Pin 30 | DGND — Digital ground |
| Pin 31 | DVDD — Digital supply voltage |
| Pin 32 | NC — Not connected (per datasheet) |
| Pin 33 | NC — Not connected (per datasheet) |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | AGND — Analog ground |
| Pin 39 | REFGND — Reference ground |
| Pin 40 | AGND — Analog ground |
| Pin 41 | AGND — Analog ground |
| Pin 42 | AGND — Analog ground |
| Pin 43 | AGND — Analog ground |
| Pin 44 | AGND — Analog ground |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | EP — Exposed thermal pad (connect to AGND) |
Typical Applications
ADS8471IBRGZR is suitable for 7 applications: Industrial Process Control PLC, Multichannel Data Acquisition Systems, Precision Test and Measurement, Medical Imaging Front-End, Optical Encoder and Resolver Feedback, Power Quality and Energy Metering, Vibration and Acoustic Analysis.
Industrial Process Control PLC
The ADS8471IBRGZR fits industrial PLC analog input modules thanks to its 16-bit resolution and 1 MSPS throughput for high-speed closed-loop control. The pseudo-bipolar +/-4.096 V input range accepts +/-5 V industrial transducer signals directly without external signal conditioning, and the internal 4.096 V reference eliminates an external reference IC. Placed on each analog input channel with proper RFI filtering, the SAR topology provides deterministic conversion latency critical for synchronized control loops. The 48-VQFN footprint supports compact PLC module designs.
Recommended
Multichannel Data Acquisition Systems
The ADS8471IBRGZR is ideal for multichannel data-acquisition (DAQ) systems where 16-bit accuracy and 1 MSPS sampling per channel are required. The parallel 16-bit interface enables direct connection to FPGAs or microcontrollers without glue logic, and the BYTE mode pin allows 8-bit bus multiplexing for cost-sensitive designs. Used with an external analog multiplexer, one ADS8471 can sequentially digitize many channels; SAR architecture's zero pipeline delay simplifies triggering. The integrated 4.096 V reference reduces per-channel BOM cost across the DAQ system.
Recommended
Precision Test and Measurement
The ADS8471IBRGZR suits bench-top and rack-mount test instrumentation where 16-bit resolution at 1 MSPS is needed for waveform capture or signal analysis. The internal low-drift 4.096 V reference provides calibration stability across temperature, and the SAR architecture delivers excellent linearity for THD measurements. Mounted in a digitizer front-end, the device pairs naturally with a precision op-amp input driver and a low-jitter clock source. The 48-VQFN package with exposed thermal pad supports high-density instrumentation layouts.
Recommended
Medical Imaging Front-End
The ADS8471IBRGZR works well in medical imaging front-ends such as ultrasound beam-formers and optical coherence tomography where 16-bit dynamic range at 1 MSPS is required per channel. The SAR architecture's deterministic latency simplifies beam-forming timing calculations, and the internal reference reduces noise coupling in sensitive analog signal paths. Placed after the LNA and time-gain compensation (TGC) stages, the ADC delivers the dynamic range needed for diagnostic imaging. Industrial temperature grade and small QFN package suit portable imaging carts.
Recommended
Optical Encoder and Resolver Feedback
The ADS8471IBRGZR is suitable for optical encoder and resolver position-feedback loops where 16-bit absolute position resolution must be acquired at high update rates. Used to digitize sine/cosine resolver signals through an op-amp front-end, the 1 MSPS throughput supports >50 kHz update rates per axis. The pseudo-bipolar input accepts bipolar resolver outputs directly, and the parallel interface connects to FPGA or DSP position-tracking logic. The compact 48-VQFN footprint enables multi-axis servo designs.
Recommended
Power Quality and Energy Metering
The ADS8471IBRGZR fits three-phase power-quality analyzers and revenue-grade energy meters where 16-bit dynamic range is needed to capture harmonics and transients on current/voltage channels. The SAR topology samples at a precise instant per cycle, enabling accurate RMS and harmonic computations. The pseudo-bipolar input accommodates current-transformer and voltage-divider outputs directly, and the internal reference simplifies per-channel analog signal chain. Placed alongside shunt or CT conditioning, the ADC supports IEC 62053-22 class 0.2S metering accuracy.
Recommended
Vibration and Acoustic Analysis
The ADS8471IBRGZR suits vibration and acoustic data-acquisition modules where 16-bit resolution at 1 MSPS per channel captures broadband machinery-condition signals. Used with piezoelectric (IEPE) sensor conditioning or MEMS microphone front-ends, the SAR ADC delivers the dynamic range for FFT-based condition monitoring. The parallel interface enables DMA-style transfers into FPGAs for real-time spectral processing, and the integrated 4.096 V reference reduces BOM cost across multiple channels in a vibration DAQ chassis.
Recommended
Recommended Products Summary
Engineering reference data for ADS8471IBRGZR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8481IRGZR | ADS8482IBRGZR | ADS8406IPFBRG4 | ADS8401IBPFBR | ADS5546IRGZRG4 |
|---|---|---|---|---|---|---|
| Package | 48-VQFN (RGZ) 7x7 mm | 48-VQFN (RGZ) - same | 48-VQFN (RGZ) - same | 48-TQFP (PFB) - different footprint | 48-TQFP (PFB) - different footprint | 48-VQFN (RGZ) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit |
| Architecture | SAR | SAR | SAR | SAR | SAR | Pipeline |
| Internal Reference | 4.096 V | Internal | Internal | External (per family) | External (per family) | External |
| Input Channels | 1 | 1 | 1 | 1 (per family) | 1 | 1 |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Integrated precision 4.096 V reference (vs ADS8406IPFBRG4)
- Drop-in-compatible same-family upgrade path (vs ADS8481IRGZR)
- SAR architecture - zero pipeline delay (vs ADS5546IRGZRG4)
Design Notes
Place a 10 uF tantalum and 0.1 uF ceramic decoupling capacitor pair as close as possible to each AVDD pin and a separate pair on each DVDD pin. Keep analog and digital ground planes connected only at a single point under the exposed thermal pad (EP), which must be soldered to the AGND plane for both electrical ground and thermal dissipation. Estimated: with 5 V AVDD and 3.3 V DVDD and 1 MSPS operation, total supply current is dominated by analog current per the datasheet electrical characteristics table; verify exact mA in the datasheet before budgeting the LDO.
Route analog input traces (IN+, IN-) as a differential pair with matched impedance and keep them away from digital output traces (DB15-DB0) and digital supply lines. The internal 4.096 V reference pin (REF) must be bypassed with a 10 uF tantalum and 0.1 uF ceramic capacitor in parallel; place the reference capacitor within 5 mm of the REF pin to avoid reference-induced conversion errors. Avoid routing digital switching signals directly over the analog input region to prevent coupling noise into the conversion result.
Do not leave the exposed thermal pad (EP) unsoldered - the EP must be soldered to a sufficient copper pad to meet the thermal resistance specifications in the datasheet and to provide the analog ground return path. Verify the BYTE pin logic level matches the host microcontroller's bus mode before initiating reads; mismatched bus modes cause shifted data bits. The BUSY/INT signal must be monitored and the read strobe (RD) gated appropriately to avoid reading stale conversion data. Estimated: at full 1 MSPS throughput with 5 V supplies, junction temperature rise should remain below 20 C with a 1 square inch copper pour; verify in the datasheet thermal table for production design.
Drive the analog inputs through a low-noise op-amp buffer (such as OPA1612) with sufficient bandwidth (>= 10x the maximum input frequency) to avoid ADC aperture-induced errors. Add an RC anti-aliasing filter at the ADC input with the cutoff just above the maximum signal frequency of interest; for 1 MSPS Nyquist, place the filter pole well below 500 kHz. Decouple the input op-amp supply separately from the ADC supply to prevent digital switching noise from coupling through the analog rail.
Compliance Information
RoHS compliant per TI product page; industrial -40C to +85C temperature grade (not AEC-Q100 automotive). Halogen-free status not explicitly stated in provided data - flagged as 'unknown'.
