ADS7813U - 16-Bit SAR ADC, 20 µs, 5V | Texas Instruments
MPN： ADS7813U ✓ 啟用中ADS7813U 概覽
A sampling ADC is a data-conversion device that acquires an analog voltage with a sample-and-hold circuit and converts it into a digital value through successive approximation. The ADS7813 belongs to the SAR ADC hierarchy, where the conversion register compares the sampled input against a trial DAC value. This architecture is appropriate for instrumentation and industrial systems requiring deterministic conversion timing, serial output, and moderate conversion speed without a continuous clock.
The ADS7813 integrates a complete 16-bit capacitor-based SAR converter, sample-and-hold circuitry, clock, reference, and serial interface. Its maximum conversion time is 20 µs, while its serial interface supports straightforward communication with embedded processors. Configurable input ranges provide flexibility for bipolar instrumentation signals and single-ended industrial sensor outputs, reducing the need for external range-switching hardware.
Operation from a single +5 V supply simplifies system power architecture, and the low-power design supports battery-instrumented and space-constrained equipment. The converter is available in a 16-pin SOIC package, identified by TI ordering code DW, with an operating temperature range of −40 °C to +85 °C. Its 16-bit resolution provides 65,536 nominal code levels, making it useful for measurements requiring more precision than a typical 12-bit converter.
Typical uses include industrial process measurement, laboratory data acquisition, sensor-interface modules, panel instrumentation, and embedded control systems. The serial interface helps reduce connection count, while selectable input ranges support bipolar sensor conditioning and unipolar transducer outputs. System designers must still account for input bandwidth, reference accuracy, source impedance, digital-interface timing, and analog noise when establishing achievable measurement precision.
A practical design consideration is that the nominal 16-bit resolution does not guarantee 16-bit absolute accuracy. Reference-voltage error, offset, gain error, comparator behavior, input-source impedance, and PCB noise can reduce end-to-end accuracy. The manufacturer datasheet should be used to select grounding, decoupling, reference-capacitor, and analog-layout arrangements for the selected input range.
This page consolidates verified manufacturer and distributor information, explicitly identified package and lifecycle details, practical ADI signal-chain companions, drop-in alternatives, and engineering guidance that are not presented as a substitute for the complete manufacturer datasheet. Pricing shown here reflects the verified distributor observation as of 2026-10-29.
直接替換替代品，適用於 ADS7813U — 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： ADS7813U （相同外形與佔位） — 差異在於 Package, Architecture, Mounting Type, Resolution, Input Type.
ADS7813UB/1K
✅ 直接替換聯絡詢價
查看資料表 →ADS7813UE4
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7813PG4
✅ 直接替換聯絡詢價
查看資料表 →ADS7809U
✅ 直接替換聯絡詢價
查看資料表 →ADS8509IDW
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7813U 最大額定值與電氣特性
| ADC Type | Successive Approximation Register (SAR) |
| 解析度 | 16 bit |
| Number of Analog Inputs | 1 input |
| Architecture | Capacitor-based 16-bit SAR A/D |
| Maximum Conversion Time | 20 µs maximum |
| 供應電壓 | +5 V single supply |
| Input Type | Bipolar and unipolar |
| Supported Input Range | ±10 V, ±5 V, 0 V to 10 V, or 0.5 V to 4.5 V |
| Additional Input Range | 0.3 V to 2.8 V high-impedance input range |
| Output Interface | Serial interface |
| Interface Compatibility | SPI-compatible serial output with daisy-chain (TAG) capability |
| Internal Functions | Sample-and-hold, clock, reference, and serial data interface |
| Reference Configuration | Internal or external reference |
| 工作溫度範圍 | −40 °C to +85 °C |
| 封裝 | 16-pin SOIC, DW package |
| 安裝類型 | Surface mount |
| RoHS Compliance | Compliant |
| REACH Compliance | Compliant |
| PFAS Status | No |
| Conflict Minerals | DRC Conflict Free |
ADS7813U 16-pin soic, dw package 腳位配置指南
ADS7813U（16-pin soic, dw package 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： ADS7813U.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADS7813U 適用於 6 應用s: Industrial Process Measurement, Laboratory Data Acquisition, Precision Sensor Signal Conditioning, Battery-Powered Field Instruments, Panel Meter and Monitoring Equipment, Embedded Control Signal Acquisition.
Industrial Process Measurement
The ADS7813U fits industrial process measurement because its 16-bit SAR architecture and maximum 20 µs conversion time provide a useful balance between resolution and acquisition speed. According to the Texas Instruments manufacturer datasheet, the converter can measure bipolar ±10 V or ±5 V inputs as well as unipolar 0–10 V and 0.5–4.5 V signals. Place the ADC behind an input-protection and scaling network, then use its serial output to digitize pressure, temperature, or level transmitter outputs. The −40 °C to +85 °C operating range supports many industrial ambient conditions, although actual accuracy depends on the external reference, conditioning circuit, grounding, and calibration.
Laboratory Data Acquisition
The ADS7813U is suitable for laboratory data-acquisition front ends that need 16-bit numerical resolution without a high-speed flash converter. The Texas Instruments datasheet specifies a 20 µs maximum conversion time and a serial interface, allowing a controller to retrieve each conversion result over a compact connection. Select the ±5 V, ±10 V, or 0.5–4.5 V range to match the instrument's signal source, and apply calibrated attenuation when operating above the selected input span. Because no sampling-rate figure was supplied in the verified data, acquisition software should base its timing on the confirmed 20 µs maximum conversion time and validate the complete clock, settling, and data-transfer sequence.
Precision Sensor Signal Conditioning
The ADS7813U can digitize low-level sensor outputs while preserving 16-bit nominal resolution and offering a documented 0.3 V to 2.8 V high-impedance input range. According to the Texas Instruments ADS7813 manufacturer information, this additional range supports low-level transducer outputs when the surrounding circuit can preserve signal integrity. Use a low-noise reference, controlled sensor excitation, and an appropriate anti-alias filter ahead of the ADC. Source impedance and settling requirements must be checked in the datasheet because the nominal code count alone does not establish practical accuracy. The serial interface also reduces the number of interconnects compared with a parallel ADC.
Battery-Powered Field Instruments
The ADS7813U suits compact field instruments because it is described by Texas Instruments as a low-power, single +5 V SAR converter with a maximum conversion time of 20 µs. The 16-pin SOIC package supports conventional surface-mount assembly, while the serial interface limits PCB routing and connector demand. Battery-operated equipment can power the analog section from the same +5 V rail as appropriate digital circuitry, provided each subsystem's current budget and regulator efficiency are verified. Because the verified data does not provide quiescent current or standby-mode consumption, a battery-life calculation must use the manufacturer datasheet rather than infer power consumption from the conversion-time rating.
Panel Meter and Monitoring Equipment
The ADS7813U is appropriate for digital panel meters and monitoring equipment that convert analog process or sensor signals into stable numeric readings. Its 16-bit resolution, selectable unipolar ranges, and configurable bipolar ranges allow one converter architecture to serve several signal levels. The serial data interface reduces the number of traces between the ADC and display or controller hardware, which is valuable in compact panels. For reliable measurements, route the analog input away from switching supplies and digital clocks, provide local supply bypassing, and use a stable reference. The published −40 °C to +85 °C range supports many enclosure environments, but the final product still requires system-level EMC and temperature validation.
Embedded Control Signal Acquisition
The ADS7813U can serve as the analog acquisition element in an embedded control system that monitors slower process variables while a microcontroller or other controller performs regulation. The 20 µs maximum conversion time permits reasonably prompt measurements, and the serial interface is practical for connecting the converter to embedded processors. Select the range that provides useful signal headroom without unnecessarily amplifying noise. A software state machine should account for conversion completion, data transfer, reference settling, and any multiplexing in the analog front end. The 16-bit nominal result should also be filtered or calibrated in software when the application requires repeatable measurements rather than simply the converter's full code range.
工程參考資料，適用於 ADS7813U — 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 | ADS7813UB | ADS7813UE4 | ADS7813P | ADS7809U | ADS8509IDW |
|---|---|---|---|---|---|---|
| Package | 16-pin SOIC (DW) | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same | 16-pin SOIC (DW) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
主要差異化特點
- Broader verified input-range selection (對比ADS7809U)
- Confirmed maximum conversion time (對比ADS8509IDW)
- Direct ADS7813-family ordering compatibility (對比ADS7813P)
設計說明
Route the analog input as a short, quiet trace directly from the conditioning network to the ADC and keep it away from switching-regulator outputs, digital clock lines, and high-current return paths. According to the Texas Instruments ADS7813 family information, the converter includes a sample-and-hold stage; nevertheless, PCB leakage, parasitic pickup, and input-network impedance can still perturb a 16-bit measurement. Use a continuous ground plane, quiet analog ground connections where appropriate, and place any input filter close to the ADC pins.
Provide local bypass capacitance at the +5 V supply pins and use the reference components and capacitor values specified in the manufacturer datasheet. Do not substitute guessed reference-capacitor values because reference settling affects conversion accuracy. The verified information establishes single +5 V operation but does not provide the complete recommended capacitor list, quiescent current, or supply ripple sensitivity. Those values must therefore be obtained from the Rev. C manufacturer datasheet before releasing the power tree.
Do not assume that a 16-bit output always provides 16 bits of useful measurement accuracy. Reference-voltage error, offset, gain error, integral nonlinearity, input noise, and source-impedance settling can reduce practical precision. When replacing ADS7813U with ADS7813UB, ADS7813UE4, ADS7813P, ADS7809U, or ADS8509IDW, verify the input range, acquisition time, conversion timing, interface polarity, and software conversion routine. Pin compatibility alone does not prove timing or measurement equivalence.
Treat the serial interface as a digital signal-integrity path and verify data setup, hold, conversion-complete, and clock timing against the selected operating mode. The verified sources describe an SPI-compatible serial output and TAG daisy-chain capability but do not include complete timing diagrams. For long traces or noisy environments, use controlled-impedance routing where appropriate, keep return paths continuous, and avoid sharing switching-node copper with the ADC reference and analog input.
合規資訊
The verified Abacus listing identifies ADS7813U as EU RoHS compliant, REACH compliant, PFAS-free, and DRC Conflict Free. No verified evidence was supplied for AEC-Q100, lead-free, or halogen-free status. The Rev. C designation appears in the verified Texas Instruments part-details snippet; no page count was asserted from the third-party PDF listing.
