ADS7824P - 12-Bit 4-Channel SAR ADC | Texas Instruments
MPN： ADS7824P ✗ 停產ADS7824P 概覽
An ADC is a data-converter IC that transforms an analog voltage into a digital code for processing, measurement, or control. The ADS7824 belongs to the SAR ADC hierarchy, where a successive-approximation internal converter determines the input voltage one bit at a time. Its four-channel multiplexer makes it suitable for systems that need to monitor several analog signals while sharing one converter and one interface.
The principal specifications are 12-bit resolution, a 40 kSPS conversion rate, a maximum sampling and conversion time of 25 microseconds, and a standard industrial differential input range of plus or minus 10 V. Laser-trimmed scaling resistors provide the input range and channel-to-channel matching of plus or minus 0.1%. Maximum INL and DNL are plus or minus 0.5 LSB, while maximum power dissipation is 50 mW.
The converter supports a single plus 5 V supply and continuous-conversion operation. Its interface can operate in parallel or serial mode, allowing it to connect to processors with either conventional bus pins or serial data links. The device is also documented as pin-compatible with the 16-bit ADS7825 family, although the different code width changes the resolution represented by each LSB.
Typical uses include industrial process measurement, analog sensor interfaces, laboratory instrumentation, data acquisition, and embedded control systems. The four-channel architecture allows multiplexed monitoring of transducers or conditioned signals, while the plus or minus 10 V range can simplify interface design around bipolar industrial sensors.
Designers should verify signal polarity, input impedance, reference requirements, interface timing, and acquisition timing before finalizing the analog front end. The ADS7824P is a legacy 28-pin plastic-DIP device, so long-term availability and assembly process compatibility should be confirmed before a new design commits to that footprint.
This page consolidates the verified manufacturer specifications, package information, pricing availability status, and practical pin-compatible alternatives. It also highlights the differences between the 12-bit ADS7824 and related family members so engineers can distinguish an exact footprint match from a merely similar converter.
直接替換替代品，適用於 ADS7824P — 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： ADS7824P （相同外形與佔位） — 差異在於 Architecture, Sampling Rate, Data Interface, Input Type, Input Voltage Range.
ADS7822PBG4
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ADS7823P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS7821P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS7825PG4
✅ 直接替換聯絡詢價
查看資料表 →ADS7828P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS7824P 最大額定值與電氣特性
| 解析度 | 12 bit |
| Architecture | Successive-approximation register (SAR) |
| Number of Input Channels | 4 channels |
| 取樣率 | 40 kSPS |
| Maximum Sampling and Conversion Time | 25 us |
| Input Type | Differential |
| 輸入電壓範圍 | +/-10 V |
| Integral Nonlinearity | +/-0.5 LSB maximum |
| Differential Nonlinearity | +/-0.5 LSB maximum |
| Channel-to-Channel Matching | +/-0.1% |
| 供應電壓 | +5 V single supply |
| Maximum Power Dissipation | 50 mW |
| Data Output Interface | Parallel and serial |
| Conversion Mode | Continuous conversion |
| 封裝 | 28-pin 0.3-inch plastic DIP |
| 安裝類型 | Through-hole |
| Internal Reference | Laser-trimmed scaling resistors |
ADS7824P 28-pin 0.3-inch plastic dip 腳位配置指南
ADS7824P（28-pin 0.3-inch plastic dip 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： ADS7824P.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS7824P 適用於 6 應用s: Industrial Process Monitoring, Data Acquisition Systems, Analog Sensor Interface, Laboratory Instrumentation, Embedded Control and Automation, Portable Measurement Equipment.
Industrial Process Monitoring
The ADS7824P fits four-channel industrial process monitoring because it combines 12-bit conversion, a 40 kSPS sampling rate, and a plus or minus 10 V differential input range. Its four input pairs can monitor conditioned pressure, temperature, position, or level signals while sharing one converter. According to the Texas Instruments manufacturer datasheet, laser-trimmed scaling resistors provide channel-to-channel matching of plus or minus 0.1%, reducing calibration differences between similar sensors. A practical design would add input protection, isolation where required, and an anti-aliasing filter before each multiplexed channel.
推薦
Data Acquisition Systems
The ADS7824P is appropriate for a compact data-acquisition module that must acquire several analog channels at up to 40 kSPS. Its maximum 25 microsecond sampling and conversion time allows rapid multiplexing, while the parallel or serial output supports different processor architectures. The verified Texas Instruments manufacturer datasheet reports maximum INL and DNL of plus or minus 0.5 LSB and maximum power dissipation of 50 mW. For laboratory or industrial use, the plus 5 V supply, reference behavior, analog settling time, and digital interface timing must be included in the system error budget.
推薦
Analog Sensor Interface
The ADS7824P can interface several bipolar sensor outputs because its input range reaches plus or minus 10 V and its multiplexer supports four differential channels. A 12-bit code provides 4096 quantization levels across the selected input span, making the converter appropriate for many condition-based sensor measurements where higher precision is not required. The manufacturer datasheet's plus or minus 0.1% channel-matching specification helps preserve consistency across similar sensors, while the 25 microsecond maximum conversion time supports rapid scans. Sensor excitation, grounding, and common-mode limits remain external design responsibilities.
推薦
Laboratory Instrumentation
The ADS7824P is useful in laboratory instruments that acquire several slow or medium-speed analog signals through a shared converter. Its four-channel multiplexer reduces the need for separate ADC packages, while selectable parallel and serial outputs simplify connection to either legacy measurement hardware or a modern embedded controller. The verified manufacturer datasheet specifies a 40 kSPS rate, a maximum conversion time of 25 microseconds, and a single plus 5 V supply. Instrument designs should still budget for reference accuracy, source impedance, input-settling time, calibration, and the conversion timing required to scan all four channels.
推薦
Embedded Control and Automation
The ADS7824P can provide an embedded controller with four analog measurement channels while conserving board space through an integrated multiplexer, sample-and-hold stage, reference circuitry, and processor interface. Its verified 50 mW maximum power dissipation and 12-bit resolution make it practical for supervised industrial equipment that does not require continuous high-rate conversion. According to the Texas Instruments manufacturer datasheet, the converter supports continuous-conversion operation. Firmware should implement gain calibration, channel identification, overrun handling, and scaling for the selected plus or minus 10 V input range.
推薦
Portable Measurement Equipment
The ADS7824P can support portable measurement equipment where four analog inputs must be digitized from a compact, low-power circuit. The device operates from a single plus 5 V supply, samples at up to 40 kSPS, and has a verified maximum power dissipation of 50 mW. These characteristics simplify power architecture compared with a multi-converter design and preserve a 12-bit measurement resolution suitable for many handheld indicators. Battery-powered implementations should add stable local regulation, input protection, and careful reference layout so changes in supply voltage or temperature do not dominate the measurement error.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7824P — 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 | ADS7822P | ADS7823P | ADS7821P | ADS7825P | ADS7828P |
|---|---|---|---|---|---|---|
| Package | 28-pin 0.3-inch plastic DIP | 28-pin 0.3-inch plastic DIP | 28-pin 0.3-inch plastic DIP | 28-pin 0.3-inch plastic DIP | 28-pin 0.3-inch plastic DIP | 28-pin 0.3-inch plastic DIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 16 bit | 12 bit |
| Number of Channels | 4 differential channels | 4 channels | 4 channels | 4 channels | 4 differential channels | 8 single-ended channels |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
主要差異化特點
- Higher conversion resolution in the documented pin-compatible replacement (對比ADS7825P)
- Four differential channels suit bipolar industrial signals (對比ADS7828P)
- Selectable parallel and serial output expands processor compatibility (對比ADS7822P)
- Verified channel consistency for multi-channel measurement (對比ADS7821P)
設計說明
The four analog inputs share a multiplexer, so allow the source and input network to settle before each conversion. The verified manufacturer datasheet specifies a maximum acquisition and conversion time of 25 microseconds, but that figure does not remove the need for adequate acquisition time or a low-impedance driver. Place the source near the converter, minimize long analog traces, and validate settling with the worst-case sensor output impedance and selected channel.
Do not treat the plus or minus 10 V input capability as permission to apply those voltages directly without considering internal signal-pin limits and external protection. The scaling network is part of the converter architecture, but overvoltage transients, reverse supply, and input clamping currents can still damage the device. Verify the complete pin ratings in the manufacturer datasheet and add appropriately rated protection for industrial transients.
For a 28-pin plastic DIP implementation, keep the analog and digital return currents separated and connect analog and digital ground pins according to the manufacturer layout guidance. Place decoupling close to the supply pins and keep the reference and analog input routes away from high-current switching nodes. Although the through-hole package is less compact than an SOIC, generous lead spacing makes careful analog routing straightforward on a legacy board.
The verified maximum power dissipation is 50 mW, which is modest compared with many analog ICs, but the ADS7824P still requires a stable single plus 5 V supply. Decoupling should be placed at the device, and reference and supply noise should be evaluated against the least significant bit. A regulator with good low-noise behavior is preferable when the acquisition system must resolve small changes in a 12-bit code.
合規資訊
The supplied verified snippets state that ADS7824 is a green product and contains no antimony or brominated flame retardants, but they do not provide a formal RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration. The package is a legacy 28-pin 0.3-inch plastic DIP.
