ADS8482IBRGZR - 18-Bit 1MSPS SAR ADC w/ Internal Ref | Texas Instruments
MPN： ADS8482IBRGZR ✓ 啟用中ADS8482IBRGZR 概覽
An SAR ADC is a type of data converter that uses a binary-search algorithm against an internal precision DAC to resolve the input voltage in a fixed number of clock cycles, producing a single-shot conversion with no pipeline latency. SAR ADCs sit within the broader data-converter hierarchy of analog-to-digital converters (ADC) -> data converters -> signal chain -> mixed-signal IC. Compared to delta-sigma or pipeline ADCs, SAR parts like the ADS8482 trade raw speed or oversampling for guaranteed single-cycle latency and deterministic DC behavior, which is why they dominate multiplexing, control-loop, and precision instrumentation front ends.
Key specifications include 1 MSPS throughput, 18-bit resolution with no missing codes, an integrated low-drift 4.096 V reference, and a fully differential input that accepts pseudo-bipolar signals. The device supports 3 V or 5 V digital I/O and operates from -40C to +85C industrial temperature range. Its micropower dissipation makes it suitable for multi-channel data-acquisition boards where heat and battery life matter, and the parallel interface simplifies connection to FPGAs, ASICs, and high-speed microcontrollers without requiring a serial-port configuration.
The internal architecture uses a charge-redistribution capacitor DAC array combined with a precision bandgap reference and an input sample-and-hold, achieving high DC accuracy and low aperture uncertainty. The pseudo-bipolar differential input allows the converter to digitize signals swinging around a common-mode voltage, eliminating the need for an external instrumentation amplifier in many cases. The configurable bus width (18/16/8 bits) is implemented through hardware mode pins, giving the system designer flexibility for legacy host processors without a full 18-bit port.
Typical applications include medical instrumentation such as patient monitoring and diagnostic imaging front ends, industrial process control and multi-channel data-acquisition systems, optical networking power monitoring, precision weigh scales, and seismic or vibration analysis equipment. The combination of 18-bit resolution, 1 MSPS speed, and integrated reference lowers the BOM for high-accuracy systems.
When designing with the ADS8482IBRGZR, provide a low-impedance input buffer and place the bypass capacitors as close to the supply pins as possible to maintain linearity at 1 MSPS. The internal reference eliminates the need for an external reference IC, but its decoupling must follow the datasheet layout recommendations for full SNR performance.
This page consolidates manufacturer specifications, distributor pricing, and pin-compatible alternatives into a single engineering reference not available on the TI datasheet alone.
直接替換替代品，適用於 ADS8482IBRGZR — 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： ADS8482IBRGZR （相同外形與佔位） — 差異在於 Input Type, Package, Architecture, Resolution, Data Interface.
ADS8482IBRGZT
✅ 直接替換📋 參考替代品（不在目錄中）
ADS8481IRGZR
✅ 直接替換聯絡詢價
查看資料表 →ADS8472IRGZR
✅ 直接替換聯絡詢價
查看資料表 →ADS8472IBRGZR
✅ 直接替換聯絡詢價
查看資料表 →ADS7813UB/1K
✅ 直接替換聯絡詢價
查看資料表 →ADS8482IBRGZR 最大額定值與電氣特性
| 解析度 | 18 bits |
| Sample Rate | 1 MSPS |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 |
| Input Type | Pseudo-Bipolar, Fully Differential |
| Internal Reference Voltage | 4.096 V |
| 介面 | Parallel (18/16/8-bit modes) |
| Supply Voltage (Analog) | 5 V |
| Supply Voltage (Digital) | 3 V or 5 V |
| 工作溫度 | -40C to +85C |
| 封裝 | 48-VQFN (RGZ) 7x7 mm |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead Free | Yes |
| No Missing Codes | 18-bit guaranteed |
ADS8482IBRGZR 48-vqfn (rgz) 7x7 mm 腳位配置指南
ADS8482IBRGZR（48-vqfn (rgz) 7x7 mm 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： ADS8482IBRGZR.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS8482IBRGZR 適用於 7 應用s: Medical Instrumentation and Patient Monitoring, Industrial Process Control and Data Acquisition, Precision Weigh Scales and Force Measurement, Optical Networking and Laser Power Monitoring, Seismic and Vibration Analysis, Automated Test Equipment and Instrumentation, Power Quality and Energy Metering.
Medical Instrumentation and Patient Monitoring
The ADS8482IBRGZR fits medical instrumentation because its 18-bit no-missing-codes resolution and 1 MSPS throughput deliver the dynamic range required for diagnostic-grade signal chains. The internal 4.096 V reference provides the low drift and low noise necessary for accurate ECG, EEG, and patient-monitor front ends. The pseudo-bipolar fully differential input simplifies connection to biomedical sensor bridges without external instrumentation amplifiers. The 48-VQFN package suits compact multi-channel patient-monitor PCBs. The parallel 18/16/8-bit interface integrates cleanly with medical-grade microcontrollers and DSPs for real-time waveform analysis.
推薦
Industrial Process Control and Data Acquisition
The ADS8482IBRGZR suits industrial process control because its 18-bit SAR core delivers single-cycle conversion latency that simplifies deterministic control loops. The internal 4.096 V reference removes the cost and drift of an external reference IC, lowering total BOM in multi-channel PLC and DCS modules. The pseudo-bipolar differential input handles +/-10 V or 4-20 mA-derived signals with proper scaling resistors, eliminating instrumentation amplifiers. The 1 MSPS throughput supports multiplexed acquisition of several sensors per channel at the kHz rates typical of industrial control. The -40C to +85C industrial temperature range covers factory-floor environments without derating.
推薦
Precision Weigh Scales and Force Measurement
The ADS8482IBRGZR fits precision weigh-scale designs because its 18-bit no-missing-codes resolution and low integral nonlinearity deliver the calibration stability required by legal-for-trade scales. The internal 4.096 V reference with low temperature drift maintains scale accuracy across factory ambient variations, eliminating external reference components. The 1 MSPS throughput allows oversampling and averaging to push effective resolution beyond 18 bits for higher-precision laboratory balances. The pseudo-bipolar differential input pairs directly with load-cell bridge outputs, removing the need for external instrumentation amplifiers. The 48-VQFN package keeps the PCB area small enough for handheld and benchtop scale designs.
推薦
Optical Networking and Laser Power Monitoring
The ADS8482IBRGZR suits optical networking power-monitoring cards because its 1 MSPS sample rate lets a single ADC digitize multiple photodiode channels via an external mux with adequate bandwidth for laser-power control loops. The integrated 4.096 V reference and pseudo-bipolar differential input directly accept transimpedance-amplifier outputs, removing the need for level-shifting signal conditioning. The 18-bit resolution captures fine gain-control steps required for EDFA and DWDM channel balancing. The 48-VQFN package fits the dense line-card form factors of modern OTN and ROADM platforms. Parallel output drives FPGA-based framer ASICs without glue logic.
推薦
Seismic and Vibration Analysis
The ADS8482IBRGZR fits seismic and vibration-analysis front ends because its 18-bit resolution and 1 MSPS throughput capture the wide dynamic range of accelerometer and geophone outputs. The internal 4.096 V reference provides low drift over industrial temperature swings, preserving calibrated sensitivity. The SAR architecture's single-cycle latency ensures deterministic sampling for cross-channel phase analysis in modal-testing systems. The pseudo-bipolar differential input accepts +/-5 V or +/-10 V sensor signals directly with simple resistor scaling. The 48-VQFN package's compact footprint allows high channel density on multi-axis vibration data-acquisition boards.
推薦
Automated Test Equipment and Instrumentation
The ADS8482IBRGZR fits automated test equipment because its 18-bit resolution, 1 MSPS throughput, and internal reference give bench and rack instruments the accuracy and density required for multi-channel measurement. The parallel interface avoids the overhead of serial ADC protocols when many ADCs must be read in tight test-loop cycles. The pseudo-bipolar differential input handles +/-10 V arbitrary waveforms from function generators with simple resistor networks. The 48-VQFN footprint supports dense switch-card layouts typical of ATE backplanes. The -40C to +85C industrial temperature range covers unconditioned factory and laboratory environments.
推薦
Power Quality and Energy Metering
The ADS8482IBRGZR suits power-quality and energy-metering designs because its 18-bit SAR core with internal 4.096 V reference supports accurate harmonic analysis of voltage and current channels up to several kHz. The 1 MSPS throughput allows simultaneous sampling of voltage and current at rates well beyond the 50th/60th harmonic requirements of IEC 61000-4-7. The pseudo-bipolar differential input accepts current-transformer and shunt-derived signals directly with scaling resistors. The 48-VQFN package fits compact residential and industrial smart-meter form factors. The parallel output integrates cleanly with metering MCUs and DSPs for real-time power calculations.
推薦
推薦產品摘要
工程參考資料，適用於 ADS8482IBRGZR — 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 | ADS8482IBRGZT | ADS8481IRGZR | ADS8472IRGZR | ADS8472IBRGZR |
|---|---|---|---|---|---|
| Brand | 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 |
| Resolution | 18 bits | 18 bits | 18 bits | 18 bits | 18 bits |
| Sample Rate | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS | 1 MSPS |
| Internal Reference | Yes (4.096 V) | Yes (4.096 V) | No (external) | No (external) | No (external) |
| Input Type | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential | Pseudo-Bipolar Differential |
| Interface | Parallel 18/16/8-bit | Parallel 18/16/8-bit | Parallel 18/16/8-bit | Parallel 18/16/8-bit | Parallel 18/16/8-bit |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主要差異化特點
- Integrated 4.096 V reference eliminates external reference BOM (對比ADS8472IBRGZR)
- Identical die and footprint as the 'IBRGZT' reel variant (對比ADS8482IBRGZT)
- Three parallel bus modes in a single pinout (對比ADS8481IRGZR)
設計說明
The ADS8482IBRGZR requires a clean 5 V analog supply on AVDD and a 3 V or 5 V digital supply on DVDD. According to the TI datasheet, AVDD must be decoupled with at least 10 uF bulk and 0.1 uF ceramic capacitors placed as close as possible to the AVDD and AGND pins. A ferrite bead between the analog and digital supply rails reduces switching-noise coupling from logic transients into the SAR comparator, preserving SNR at 1 MSPS.
The 48-VQFN package's exposed thermal pad must be soldered to a continuous ground plane on the top layer for heat dissipation and electrical grounding. According to TI layout recommendations, place input and reference decoupling capacitors within 50 mils of their respective pins, and route the analog input traces as a matched differential pair to maintain common-mode rejection. Split the ground plane only if necessary, stitching it back together under the ADC.
When driving the ADS8482IBRGZR from a high-impedance source, place a wide-bandwidth op-amp buffer within 25 mm of the analog input pins. According to the TI ADS8482 datasheet, the input sample-and-hold draws charge transients at the start of each conversion; insufficient drive strength causes gain error and distortion. For pseudo-bipolar signals, match the source impedances on AINP and AINN within 1% to preserve common-mode rejection ratio.
A common pitfall is forgetting to bypass the internal reference pin - the ADS8482's 4.096 V reference needs a 10 uF ceramic plus 0.1 uF ceramic bypass per the TI datasheet. Without proper decoupling, the reference noise couples into the SAR comparator and degrades SNR. Another pitfall is using a long CS or RD trace that picks up digital noise; keep these strobes short and series-terminate if the trace exceeds 25 mm to a host controller.
合規資訊
RoHS compliant per TI product page. Industrial temperature grade -40C to +85C. Not AEC-Q100 qualified (consumer/industrial, not automotive).
