ADS7824U - 12-Bit 4-Channel SAR ADC | Texas Instruments
MPN： ADS7824U ✓ 啟用中ADS7824U 概覽
An ADC is a data-acquisition IC that converts continuously varying analog voltages into digital values for processing, measurement, display, or control. A sampling ADC uses an internal sample-and-hold circuit before conversion, while the SAR architecture progressively resolves the input using a comparator and internal DAC. Within the broader hierarchy of data-converter ICs, the ADS7824U is a multichannel SAR ADC designed for low-power, low-resolution measurement rather than high-speed waveform capture.
Key features include conversion to within ±0.5 LSB in 25 µs maximum, laser-trimmed input-scaling resistors, a standard industrial ±10 V input range, and channel-to-channel matching of ±0.1%. Maximum power dissipation is 50 mW, and the device supports a power-down mode with 50 µW power consumption. Both parallel and serial data outputs allow connection to either a parallel microprocessor bus or a serial interface.
The four-channel analog multiplexer provides ±10 V bipolar input capability through external circuitry, while the internal reference and conversion system support repeatable measurement. The ADS7824 is also identified as pin-compatible with the 16-bit ADS7825, although the higher-resolution replacement changes code width and corresponding least-significant-bit size and therefore requires system-level verification.
Typical applications include industrial process monitoring, laboratory measurement instruments, sensor signal acquisition, multichannel data loggers, and embedded control systems. The 25 µs maximum conversion time supports moderate-rate sampled measurements rather than high-frequency signal analysis.
Designers should account for input overvoltage protection, reference stability, source impedance, settling time, digital-interface timing, and the substantial voltage swing present around the ±10 V range. A common layout error is routing high-impedance sensor inputs directly to the multiplexer without adequate protection and filtering.
This page consolidates the verified manufacturer and distributor information, practical application guidance, parameter comparisons, and drop-in replacement limitations into design-focused guidance that is not limited to basic distributor catalog data.
直接替換替代品，適用於 ADS7824U — 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： ADS7824U （相同外形與佔位） — 差異在於 Number of Input Channels, Package, Power Dissipation, Resolution, Channel-to-Channel Matching.
ADS7824Y
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS7824ID
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS7825UE4
✅ 直接替換聯絡詢價
查看資料表 →ADS7825UBG4
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7824U 最大額定值與電氣特性
| Converter Type | Successive-approximation (SAR) analog-to-digital converter |
| 解析度 | 12 bit |
| Number of Input Channels | 4 channels |
| Sampling and Conversion Time | 25 µs maximum |
| Input Range | ±10 V |
| Integral Nonlinearity | ±0.5 LSB maximum |
| Differential Nonlinearity | ±0.5 LSB maximum |
| Channel-to-Channel Matching | ±0.1% |
| Power Dissipation | 50 mW maximum |
| Power-Down Power Consumption | 50 µW |
| 供應電壓 | +5 V single supply |
| Data Output | Parallel or serial microprocessor interface |
| Integrated Functions | 4-channel multiplexer, sample-and-hold, clock, and reference |
| Input Scaling | Laser-trimmed scaling resistors |
| 封裝 | 28-pin 0.3-inch plastic SOIC |
| 安裝類型 | Surface mount |
| RoHS 狀態 | unknown |
| REACH Status | unknown |
| Automotive Qualification | not_applicable |
ADS7824U 28-pin 0.3-inch plastic soic 腳位配置指南
ADS7824U（28-pin 0.3-inch plastic soic 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： ADS7824U.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS7824U 適用於 6 應用s: Industrial Process Monitoring, Laboratory Measurement Instrumentation, Sensor Signal Acquisition, Embedded Data Logger, Automated Test Equipment, Power and Control-System Monitoring.
Industrial Process Monitoring
The ADS7824U fits four-channel industrial process monitoring because it combines a four-input multiplexer with 12-bit SAR conversion and a 25 µs maximum sampling-and-conversion time. The ±10 V input range simplifies connection to transducers that already produce bipolar industrial signals, while laser-trimmed scaling resistors provide ±0.1% channel-to-channel matching. Engineers can place the converter behind protected analog inputs and use a microcontroller to sample sensors sequentially. The single +5 V supply and 50 mW maximum dissipation support compact instrumentation, although external attenuation, filtering, and surge protection remain necessary when field wiring is exposed.
推薦
Laboratory Measurement Instrumentation
The ADS7824U is appropriate for laboratory instruments that measure several slow or medium-rate analog inputs and require deterministic conversion timing. A 12-bit result can represent 4096 codes, while the stated ±0.5 LSB maximum nonlinearity and ±0.1% channel matching support repeatable instrument-channel comparisons. The 25 µs maximum acquisition time enables periodic sampling without the power and complexity of a high-speed flash converter. Parallel or serial data output lets the instrument adapt to different processor interfaces. Reference stability, input settling, and gain calibration should be included in the measurement uncertainty budget.
推薦
Sensor Signal Acquisition
The ADS7824U can acquire four sensor channels when the signals are scaled into its ±10 V range. The integrated sample-and-hold, multiplexer, reference, and conversion logic reduce the external analog footprint, while 12-bit resolution provides sufficient code density for many position, level, temperature, and pressure measurements. Because source impedance affects settling during the 25 µs conversion interval, sensor buffers or RC networks may be required. The ±10 V range provides headroom over common 0–5 V and 0–10 V sensor outputs, but protection against industrial transients should be implemented outside the ADC.
推薦
Embedded Data Logger
The ADS7824U suits compact embedded data loggers that periodically sample multiple analog channels and then store or transmit the results. Its four-channel multiplexer avoids duplicating front-end circuitry, while serial or parallel output provides flexibility for embedded processors. The 50 µW power-down specification can reduce consumption between logging intervals, although the complete system budget must include supply efficiency and interface logic. For 12-bit records, one LSB represents one of 4096 counts; designers should define scaling, calibration, timestamp, and missing-sample behavior so logged data remains comparable across deployments.
推薦
Automated Test Equipment
The ADS7824U can be used in automated test equipment for DUT rails, control voltages, and slow feedback signals. Four channels allow sequential measurements within a single conversion framework, and the 25 µs maximum conversion time supports moderate test-cycle rates. Parallel output may reduce firmware complexity when the controller has limited peripheral resources, while serial output can simplify board routing and isolation. Measurement accuracy still depends on the external reference and analog input network. Test limits, averaging, calibration records, and channel sequencing should be implemented separately from the converter because the ADC itself does not provide automatic range detection or channel diagnostics.
推薦
Power and Control-System Monitoring
The ADS7824U is usable for supervisory measurements in power and industrial control systems where several voltage-feedback or status signals must be digitized. Its ±10 V range accommodates appropriately scaled analog signals, and the four-channel multiplexer supports sequential monitoring without four separate converters. The 12-bit resolution and ±0.1% channel matching are useful when channels need comparable readings. A single +5 V supply simplifies integration with existing control electronics. Designers should separate noisy switching nodes from sensitive ADC traces, protect inputs during fault conditions, and verify that the 25 µs conversion timing meets the control-loop update requirement.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7824U — 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 | ADS7824Y | ADS7824ID | ADS7825U | ADS7825UBG4 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-pin SOIC | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same | 28-pin SOIC - same |
| Resolution | 12 bit | 12 bit | 12 bit | 16 bit | 16 bit |
| Conversion Architecture | SAR | SAR | SAR | Sampling ADC | Sampling ADC |
| Data Interface | Parallel or serial | Parallel or serial | Parallel or serial | Parallel or serial | Parallel or serial |
| Pin Compatibility | ADS7824 family reference | Same-family drop-in candidate | Same-family drop-in candidate | Explicitly identified as pin-compatible by TI | ADS7825-family drop-in candidate |
主要差異化特點
- Direct 12-bit family fit rather than higher-resolution replacement (對比ADS7825U)
- Manufacturer-documented pin-compatible upgrade path (對比ADS7824Y)
- Four-channel integration reduces duplicated front-end circuitry (對比ADS7824ID)
設計說明
Route each analog input directly to its multiplexed ADC pin and keep the path short. Place input filtering and protection close to the connector or transducer, with a return path that does not share switching-current traces. The 25 µs acquisition-and-conversion interval must also accommodate input settling; high source impedance may require a buffer or a longer acquisition design confirmed against the manufacturer timing specifications.
Separate analog inputs, the reference network, and digital control or data lines during layout placement. Provide a quiet ground reference for the converter and avoid routing multiplexer outputs or digital clock signals beneath the sensitive input area. Decoupling should follow the manufacturer application schematic and datasheet recommendations. A solid ground plane is preferable to fragmented analog and digital ground regions when the board contains high-current switching circuitry.
Do not treat the ±10 V input capability as permission to exceed the absolute maximum ratings during faults. Add overvoltage clamps, series impedance, or appropriately rated protection where the source can exceed the normal range. Also verify input polarity, reference scaling, and software interpretation of negative codes. Replacing the 12-bit ADS7824U with a 16-bit ADS7825 changes the LSB size and requires a corresponding review of gain, calibration, and overflow behavior.
合規資訊
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for the exact ADS7824U orderable MPN. AEC-Q100 qualification was not identified and is therefore recorded as not applicable.
