ADS8472IBRGZR - 16-Bit 1MSPS SAR ADC, Pseudo-Bipolar | TI
MPN： ADS8472IBRGZR ✓ 啟用中ADS8472IBRGZR 概覽
An SAR ADC is a precision converter that performs a binary search across an internal capacitive array, sampling the input on an internal track-and-hold capacitor and converting in a fixed number of clock cycles per conversion. SAR converters are prized for their deterministic latency, zero-pipeline delay, and excellent DC linearity, which is why 16-bit 1-MSPS SARs sit between 8-/10-/12-bit general-purpose ADCs and higher-speed delta-sigma/pipeline parts in the data-converter hierarchy (data converters -> ADCs -> SAR ADCs -> precision SAR).
Key features include ±0.65 LSB (max) INL, ±0.5 LSB (typ) DNL with no missing codes, internal low-drift 4.096-V reference, single +5-V analog supply (with a separate +3-V to +5-V digital I/O supply), pseudo-bipolar fully differential inputs spanning approximately ±4.096 V or 0 V to +4.096 V depending on input configuration, and a hardware/serial-interface-friendly BYTE mode. The wide digital-host tolerance simplifies pairing with 3.3-V FPGAs, DSPs, and 5-V microcontrollers.
The device uses a charge-redistribution capacitive DAC core with inherent sample-and-hold, so an external front-end buffer/amplifier is typically needed only when source impedance exceeds the datasheet guidance. Power consumption is around 110 mW at 1 MSPS and scales down at lower throughput, with explicit nap and power-down modes for duty-cycled battery or data-acquisition scenarios.
Typical applications include industrial process-control data acquisition modules, multi-channel isolated measurement front ends, optical encoder/position-sensing signal chains, medical instrumentation front ends, and seismic/vibration monitoring where 16-bit noise-free resolution and DC accuracy are critical. The pseudo-bipolar differential input lets it accept both ±V sensors and unipolar transducer outputs.
When designing with this part, keep analog and digital grounds joined at a single star point near the exposed pad, and allocate sufficient copper for the EP to keep junction temperature within the -40 °C to +85 °C industrial range. Choose input RC components per the datasheet front-end section to avoid degradation of THD and noise.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a faster path from selection to prototype.
直接替換替代品，適用於 ADS8472IBRGZR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS8472IBRGZR （相同外形與佔位） — 差異在於 Package, Operating Temperature, Resolution, Input Type, Architecture.
ADS8472IBRGZT
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8472IRGZRG4
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8472IRGZTG4
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8471IBRGZR
✅ 直接替換聯絡詢價
查看資料表 →ADS8472IBRGZR-Q1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS8472IBRGZR 最大額定值與電氣特性
| 解析度 | 16 bit |
| Sample Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation) |
| Input Channels | 1 differential (pseudo-bipolar) |
| Input Type | Pseudo-bipolar, fully differential |
| INL (max) | ±0.65 LSB |
| DNL (typ) | ±0.5 LSB |
| Internal Reference | 4.096 V |
| Analog Supply | +5 V |
| Digital I/O Supply | +3 V to +5 V |
| Data Interface | Parallel (16-bit or 8-bit byte mode) |
| 封裝 | 48-VQFN (RGZ) 7x7 mm with EP |
| 工作溫度 | -40 °C to +85 °C (industrial) |
| Power Consumption (1 MSPS) | Approximately 110 mW |
| RoHS 狀態 | Compliant |
ADS8472IBRGZR 48-vqfn (rgz) 7x7 mm with ep 腳位配置指南
ADS8472IBRGZR（48-vqfn (rgz) 7x7 mm with ep 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： ADS8472IBRGZR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS8472IBRGZR 適用於 6 應用s: Industrial Process Control Data Acquisition, Medical Instrumentation Front End, Optical Encoder and Position-Sensing Signal Chains, Seismic and Vibration Monitoring, Power-Line and Motor-Control Monitoring, Automated Test Equipment (ATE) and Instrumentation.
Industrial Process Control Data Acquisition
The ADS8472IBRGZR's 1 MSPS throughput and 16-bit resolution make it a strong fit for industrial multi-channel data-acquisition modules where determinism and DC accuracy are critical. The pseudo-bipolar differential input accepts ±V signals from thermocouples, strain gauges, and 4-20 mA current-loop transducers after shunt conversion, while the 4.096-V internal reference simplifies scaling to engineering units. Compared to delta-sigma alternatives the ADS8472 provides zero-latency conversion ideal for closed-loop control. Pair it with the THS4032 driver and ISO1050 isolated transceiver for robust PLC/DCS front ends.
推薦
Medical Instrumentation Front End
Patient-monitoring and laboratory-analyzer front ends benefit from the ADS8472IBRGZR's 16-bit noise-free resolution, pseudo-bipolar differential inputs that reject common-mode noise from long patient cables, and ±0.65 LSB INL that preserves measurement accuracy across the dynamic range. The internal 4.096-V reference removes the need for a precision external reference IC, simplifying the BOM and reducing calibration drift over time. For ECG, EEG, and pulse-oximetry modules, the device's 1 MSPS sample rate supports oversampling for SNR improvement. Pair with the INA128 instrumentation amp and ISO124 isolation barrier for IEC 60601-1 compliance.
推薦
Optical Encoder and Position-Sensing Signal Chains
The ADS8472IBRGZR is well suited to optical-encoder, resolver-to-digital, and linear-position-sensing signal chains where multiple analog channels must be sampled synchronously without pipeline delay. Its SAR architecture gives deterministic single-cycle conversion latency, which simplifies the host firmware timing and lets the position loop close tightly. The wide digital I/O tolerance (3 V to 5 V) means it can connect directly to FPGAs such as the XC6SLX16 or DSPs such as the TMS320F28335. Add an external differential driver like the THS4521 for high-impedance photodiode transimpedance front ends.
推薦
Seismic and Vibration Monitoring
The 16-bit resolution and 1 MSPS sample rate of the ADS8472IBRGZR support seismic-data-acquisition nodes and vibration-monitoring systems where geophone or accelerometer outputs need to be captured at high sample rates with low harmonic distortion. The pseudo-bipolar differential input range handles both ±5 V accelerometers and 4-20 mA vibration-sensor outputs after shunt conversion, and the high PSRR of the on-chip reference rejects supply-borne noise from industrial environments. Use multiple ADS8472 chips synchronized via the BUSY pin to build multi-channel acquisition modules.
推薦
Power-Line and Motor-Control Monitoring
Three-phase power-quality analyzers and motor-drive current-sensing modules use the ADS8472IBRGZR to digitize shunt- or CT-derived current signals with the 1 MSPS sample rate needed to capture PWM-edge transients from modern SiC and IGBT inverters. The differential pseudo-bipolar input accepts bi-directional current with a single supply rail, simplifying PCB layout versus true bipolar parts. Pair with the AMC1301 reinforced isolation amplifier for high-voltage drive stages, and feed the digitized data into the TMS320F28335 Delfino MCU for FFT-based fault detection.
推薦
Automated Test Equipment (ATE) and Instrumentation
Bench-top source-measurement units, parametric testers, and lab instrumentation benefit from the ADS8472IBRGZR's ±0.65 LSB INL and 1 MSPS throughput, which together provide the DC accuracy and speed required for production-line DUT testing. The internal 4.096-V reference and pseudo-bipolar differential inputs let a single ADC handle multiple voltage and current ranges after front-end scaling. Combined with the OPA2277 low-offset driver and a precision reference such as the REF5040A, the ADS8472 anchors ATE digitizer channels with full 16-bit linearity to within ±1 LSB at production volumes.
推薦
推薦產品摘要
工程參考資料，適用於 ADS8472IBRGZR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS8472IBRGZT | ADS8472IRGZRG4 | ADS8472IRGZTG4 | ADS8471IBRGZR | ADS8472IBRGZR-Q1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-VQFN (RGZ) 7x7 mm | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same | 48-VQFN (RGZ) 7x7 mm - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Input Type | Pseudo-bipolar, differential | Pseudo-bipolar, differential | Pseudo-bipolar, differential | Pseudo-bipolar, differential | Single-ended, unipolar | Pseudo-bipolar, differential |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| INL (max) | ±0.65 LSB | ±0.65 LSB | ±0.65 LSB | ±0.65 LSB | ±0.65 LSB | ±0.65 LSB |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +125 °C (AEC-Q100) |
| Automotive Grade | No | No | No | No | No | Yes (AEC-Q100) |
主要差異化特點
- Pseudo-bipolar fully differential input range (對比ADS8471IBRGZR)
- AEC-Q100 automotive-qualified option available (對比ADS8472IBRGZR-Q1)
- Same-family drop-in alternatives with multiple reel options (對比ADS8472IBRGZT / IRGZRG4 / IRGZTG4)
設計說明
The 48-VQFN (RGZ) package exposes a thermal pad (EP) on the underside that must be soldered to a PCB copper pour for both electrical ground and thermal dissipation. According to the TI ADS8472 datasheet, the EP should be tied to the analog ground plane, and the PCB should allocate at least 1 square inch of copper on inner and outer layers stitched with vias to keep junction temperature within the -40 °C to +85 °C industrial range. Place the input RC anti-aliasing network within 5 mm of the IN+ and IN- pins to minimize trace-induced distortion.
The ADS8472IBRGZR requires two separate supplies: a +5 V analog AVDD and a +3 V to +5 V digital DVDD, both of which must be decoupled with 10 µF tantalum plus 0.1 µF ceramic capacitors close to the supply pins. According to TI's reference designs, the analog and digital ground planes should join at a single point under or near the EP, and the DVDD supply should be sourced from a ferrite-bead-filtered low-noise LDO such as the TPS7A4701 to prevent digital switching noise from coupling into the analog front end. Avoid sharing the AVDD rail with high-current drivers.
Do not exceed the datasheet-recommended input source impedance without a dedicated ADC driver such as the THS4032, or THD and SNR will degrade at full 1 MSPS throughput. The pseudo-bipolar differential input requires careful common-mode voltage design - tie the input common-mode to the internal reference midpoint through a high-impedance buffer if source impedance is high. Finally, observe the BYTE mode timing relationships in the timing diagrams; reading the high byte before the low byte in 8-bit mode yields corrupted data unless the host respects the BUSY/RD handshake exactly as specified.
合規資訊
Standard ADS8472IBRGZR is not AEC-Q100 qualified - choose the Q1 suffix for automotive. RoHS and REACH compliance per TI product page.
