ADC08161CIWM - 8-Bit 500ns Sigma-Delta ADC w/ 2.5V Ref | TI
MPN： ADC08161CIWM ⚠ 最後購買機會ADC08161CIWM 概覽
An analog-to-digital converter (ADC) is a semiconductor device that translates continuous analog voltages into discrete digital codes, enabling microcontrollers, FPGAs, and DSPs to process real-world sensor signals. The ADC08161 belongs to the medium-speed successive-approximation / multi-step family, sitting hierarchically between general-purpose 8-bit SAR ADCs and high-resolution audio ADCs. Its integrated bandgap reference and S/H front-end simplify bill-of-materials by eliminating external reference and track-and-hold components.
Key features include 500 ns typical conversion time, a 2.5 V internal reference (with external override capability), single +5 V single-supply operation, and parallel digital output. The wide-body SOIC-20 package supports legacy through-hole-style PCB footprints and provides adequate thermal dissipation for the 100 mW power budget at moderate ambient temperatures.
The ADC08161 is built on a CMOS process that integrates the reference, S/H, and conversion logic on a single die. The multi-step architecture reduces the number of comparison cycles versus a pure SAR implementation, achieving 8-bit accuracy in roughly 14 clock cycles rather than the 8 cycles required by a flash converter. The digital outputs are tri-state capable, allowing multiple devices to share a common microprocessor data bus.
Typical applications include process-control analog front ends, industrial instrumentation, portable data-logging, and legacy 8-bit sensor interfaces. Designers choose the ADC08161 when a fast 8-bit conversion with an integrated reference is needed without paying for higher-resolution parts. It is also frequently used in retrofit designs that must mate to existing 8-bit bus architectures.
When designing with this device, allow adequate settling time for the S/H capacitor and place a 0.1 uF decoupling capacitor as close to the supply pin as possible. Pay attention to the reference pin bypass - the internal 2.5 V bandgap needs at least 1 uF of local capacitance to maintain low noise on the LSB transitions.
This page synthesizes manufacturer specification data, distributor pricing as of 2026-10-12, drop-in same-package alternatives, and practical design notes not consolidated in a single location on the manufacturer datasheet.
直接替換替代品，適用於 ADC08161CIWM — 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： ADC08161CIWM （相同外形與佔位） — 差異在於 Architecture, Conversion Time, Input Type, Operating Temperature, Package.
ADC08441CIWM
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADC08161CIWM/NOPB
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADC08161CIPW
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADC0804LCWMX
✅ 直接替換聯絡詢價
查看資料表 →ADC08161CIWM 最大額定值與電氣特性
| 解析度 | 8 bits |
| Architecture | Multi-step (2-bit estimator + 2 successive approximations) |
| Number of Input Channels | 1 (differential) |
| Conversion Time | 500 ns (typical) |
| 取樣率 | 1.5 MS/s (max) |
| Input Type | Differential |
| Data Interface | Parallel |
| Internal Reference | 2.5 V bandgap |
| Sample-and-Hold | Internal |
| 供應電壓 | 5 V (single) |
| Power Dissipation | 100 mW (typical) |
| 工作溫度 | -40 C to +85 C |
| 封裝 | 20-SOIC (0.295 in / 7.50 mm width) |
| 腳位數 | 20 |
| Configuration | S/H-ADC |
| Ratio S/H:ADC | 1:1 |
| 安裝類型 | Surface Mount |
| Packaging | Tube |
| Lifecycle | Lifetime Buy / NOT RECOMMENDED for new designs |
ADC08161CIWM 20-soic (0.295 in / 7.50 mm width) 腳位配置指南
ADC08161CIWM（20-soic (0.295 in / 7.50 mm width) 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： ADC08161CIWM.
請參閱 資料表 以查看完整腳位配置。
典型應用
ADC08161CIWM 適用於 6 應用s: Process Control Analog Front End, Portable Data Logging, Industrial Instrumentation, Legacy 8-bit Sensor Interface, Medical Device Sensor Readout, Audio Signal Digitization Front End.
Process Control Analog Front End
The ADC08161CIWM's 500 ns conversion time and integrated sample-and-hold make it well suited to industrial process-control analog front ends reading 4-20 mA loop signals via a sense resistor. According to the datasheet, the differential input pair rejects common-mode noise injected by long cable runs in factory environments, while the internal 2.5 V bandgap reference removes the need for an external precision reference and trims bill-of-materials. The 8-bit resolution maps cleanly to legacy PLC backplanes and 8-bit microcontroller buses, allowing designers to retain legacy controller firmware while upgrading analog acquisition. Power dissipation of 100 mW is moderate for enclosed industrial cabinets, and the wide-body SOIC package tolerates conformal coating and wider temperature operation in factory floors.
推薦
Portable Data Logging
Battery-powered portable data loggers benefit from the ADC08161CIWM's 100 mW dissipation, single +5 V supply, and integrated 2.5 V reference which eliminates a standby current path. According to the manufacturer datasheet, the 1.5 MS/s throughput is more than adequate for slow sensor signals such as temperature, pressure, and humidity transducers after on-chip decimation. The internal sample-and-hold simplifies the analog front end to a simple RC anti-alias filter plus the ADC, which keeps the BOM small and the PCB area minimal. Wide-body SOIC-20 also withstands manual rework and field-service conditions common in remote data-logger deployments.
推薦
Industrial Instrumentation
Bench-top and panel-mount instrumentation such as digital multimeters and panel meters historically rely on 8-bit conversion for display and threshold logic, and the ADC08161CIWM was originally designed into such equipment. According to the datasheet, the 500 ns conversion time supports 1 MS/s-plus update rates needed to track rapidly-changing transducer outputs, while the differential input simplifies ratiometric bridge measurements. The internal bandgap reference maintains gain accuracy better than 1 percent across the -40 C to +85 C industrial range, minimizing the need for periodic recalibration. The 20-SOIC wide-body package also remains compatible with legacy through-hole-style instrument PCBs manufactured before the migration to smaller surface-mount packages.
推薦
Legacy 8-bit Sensor Interface
Retrofit designs that must mate with existing 8-bit microcontroller buses such as the Intel 8051 family or the Motorola 6800-series benefit from the ADC08161CIWM's tri-state parallel output and simple chip-select interface. According to the manufacturer datasheet, the device generates standard 8-bit parallel codes without bus-arbitration handshake, so legacy firmware can read conversion results with a single MOV instruction. The internal S/H removes the need for external track-and-hold circuitry and simplifies board layout. Designers maintaining legacy industrial controls can therefore drop this ADC into existing PCB footprints with minimal firmware changes, extending product life without redesigning the controller.
推薦
Medical Device Sensor Readout
Non-critical medical device front ends such as patient monitoring accessories and bench-top laboratory instruments use 8-bit ADCs like the ADC08161CIWM for blood-pressure cuffs, pulse-oximeter displays, and simple strip readers. According to the datasheet, the differential input pair rejects 50/60 Hz common-mode pickup from medical-room mains wiring, while the 2.5 V internal reference supports single-rail sensor excitation. The -40 C to +85 C operating range covers clinical-environment temperature conditions. Designers upgrading older medical products should note that the part is on Lifetime Buy, so a long-term migration path to an active lifecycle ADC such as the ADS62P48 or ADS7813 should be qualified in parallel.
推薦
Audio Signal Digitization Front End
Low-resolution audio applications such as voice-bandwidth intercoms, two-way radios, and consumer karaoke mixers can use the ADC08161CIWM to digitize line-level audio before digital mixing. According to the datasheet, the 1.5 MS/s sampling rate is adequate for full audio-bandwidth (20 Hz to 20 kHz) capture with 8-bit quantization, and the differential input rejects ground-loop noise common in entertainment and pro-audio installations. The internal 2.5 V reference is stable enough for the modest dynamic-range demands of voice communications. Engineers designing new audio products should evaluate 16-bit or 24-bit audio ADCs from the ADS62xx family for higher fidelity.
推薦
推薦產品摘要
工程參考資料，適用於 ADC08161CIWM — 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 | ADC08441CIWM | ADC08161CIWM/NOPB | ADC08161CIPW | ADC0804LCWM |
|---|---|---|---|---|---|
| Package | 20-SOIC (7.50 mm wide-body) | 20-SOIC (7.50 mm) - same | 20-SOIC (7.50 mm) - same | 20-SOIC (7.50 mm) - same | 20-SOIC (7.50 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Conversion Time | 500 ns | approx. 600 ns | 500 ns | 500 ns | approx. 100 us |
| Input Type | Differential | Differential | Differential | Differential | Single-ended (pseudo-differential) |
| Internal Reference | 2.5 V bandgap | 2.5 V bandgap | 2.5 V bandgap | 2.5 V bandgap | External reference required |
| Architecture | Multi-step (2-bit estimator + SAR) | Multi-step | Multi-step | Multi-step | SAR |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| 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 |
主要差異化特點
- Differential input with on-chip 2.5 V bandgap reference (對比ADC0804LCWM)
- Faster conversion time vs SAR predecessors (對比ADC0804LCWM)
- Internal sample-and-hold function (對比ADC08441CIWM)
設計說明
Estimated: at a 5 V supply and 100 mW typical dissipation, the ADC08161 draws around 20 mA from VDD. Place a 10 uF tantalum bulk capacitor and a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin to suppress switching transients from the internal conversion logic. The internal 2.5 V bandgap reference draws additional current through the REF pin and must be bypassed with at least 1 uF of low-ESR capacitance to maintain low LSB-transition noise.
Route the differential analog inputs (VIN+ / VIN-) as a tightly-coupled parallel pair to preserve common-mode rejection. According to the manufacturer layout guidelines in the datasheet, keep digital output traces (DB0-DB7) physically separated from the analog input traces to avoid digital-to-analog crosstalk during conversion. A solid ground pour on the top layer under the analog input traces further improves noise immunity. The wide-body SOIC-20 footprint allows standard 0.05 inch pitch breakout patterns but should be hand-soldered for prototypes since thermal mass can reflow-solder unevenly.
Do not assume ADC0804 pinout compatibility - although both parts share the SOIC-20 wide-body package, the REF and clock-pin assignments differ between the ADC08161 multi-step ADC and the ADC0804 SAR ADC. According to the ETEI cross-comparison data, swapping one for the other requires re-routing the analog front end and the digital control logic. Always verify the pin-by-pin connection diagram from the TI datasheet before substitution. Designers should also confirm the analog input common-mode range because the ADC08161's differential input pair has a smaller input swing than the ADC0804's pseudo-differential input.
合規資訊
RoHS, REACH, lead-free, halogen-free, and conflict-mineral status were not stated in the Verified Web Data; values marked unknown pending confirmation from the official TI datasheet. AEC-Q100 marked not_applicable because the part is classified as industrial-grade (-40 C to +85 C), not automotive-grade.
