ADC10738CIWMX - 10-Bit+Sign SAR ADC, 74kSPS, 8-Input MUX | TI
MPN： ADC10738CIWMX ✗ 停產ADC10738CIWMX 概覽
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm implemented with a capacitive DAC and a comparator to resolve an input voltage one bit per clock cycle. Compared with integrating or sigma-delta ADCs, SAR converters deliver a deterministic latency per conversion and excellent DC accuracy, making them the workhorse choice for multiplexed data-acquisition systems where many channels must be sampled at moderate rates. The ADC10738 family (which includes the ADC10731, ADC10732, and ADC10734 single-channel variants) adds an 8-input analog MUX plus an internal reference, reducing the total external part count for a multi-channel data-acquisition front end.
The 8-input analog MUX lets the host microcontroller cycle through up to eight single-ended analog signals (or four differential pairs) without an external analog switch. The integrated sample-and-hold amplifier acquires the selected input in less than 1 us, while the 2.5V bandgap reference can be used to drive external circuitry or be overdriven with an external reference for ratiometric measurements. A power-down mode reduces current consumption to 18 uW, useful for battery-powered portable instruments that spend most of their life in standby.
Typical applications include industrial process control loop monitoring, portable handheld multimeters and DMMs, multi-channel sensor data loggers (temperature, pressure, strain-gauge bridges), and factory-automation front ends. The 8-channel MUX makes the part especially attractive for systems that need to monitor several sensors in sequence rather than simultaneously. The serial data interface reduces pin count versus parallel-output ADCs, which is valuable in cost-sensitive or space-constrained designs.
When laying out the PCB, place the 0.1 uF supply bypass capacitor as close as possible to the VDD pin and keep analog input traces short and guarded. The internal reference output requires a 1 uF to 10 uF low-ESR bypass capacitor on REF_OUT; do not load this pin with more than a few hundred microamps. To minimize crosstalk, place digital and analog grounds on separate planes joined at a single point near the ADC.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. Pricing is current as of 2026-10-12, and lifecycle status reflects the latest data from DigiKey and Mouser.
直接替換替代品，適用於 ADC10738CIWMX — 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： ADC10738CIWMX （相同外形與佔位） — 差異在於 Package, Input Type, Resolution, Data Interface, Number of Input Channels.
ADC10738CIWMX/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC10738CIWM
✅ 直接替換📋 參考替代品（不在目錄中）
ADC10158CIWMX/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC10154CIWM
✅ 直接替換📋 參考替代品（不在目錄中）
ADC10464CIWMX/NOPB
✅ 直接替換聯絡詢價
查看資料表 →ADC10738CIWMX 最大額定值與電氣特性
| 解析度 | 10 Bits + Sign |
| Architecture | SAR (Successive Approximation Register) |
| Number of Analog Inputs | 8 (single-ended) / 4 (differential) |
| Sampling Rate (Max) | 74 kSPS |
| Conversion Time (Max) | 5 us |
| Supply Voltage (Single) | 5 V |
| Power Consumption (Active, Max) | 37 mW |
| Power Consumption (Power-Down) | 18 uW |
| Internal Reference | 2.5 V bandgap, +/-2% (max) |
| Data Interface | Serial |
| Sample-and-Hold | Integrated |
| Input Type | Single-ended or differential |
| 工作溫度 | -40C to +85C |
| 封裝 | 24-SOIC (WM), wide-body |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
ADC10738CIWMX 腳位配置
| 腳位 1 | CH0 — Analog input channel 0 |
| 腳位 2 | CH1 — Analog input channel 1 |
| 腳位 3 | CH2 — Analog input channel 2 |
| 腳位 4 | CH3 — Analog input channel 3 |
| 腳位 5 | CH4 — Analog input channel 4 |
| 腳位 6 | CH5 — Analog input channel 5 |
| 腳位 7 | CH6 — Analog input channel 6 |
| 腳位 8 | CH7 — Analog input channel 7 |
| 腳位 9 | AGND — Analog ground |
| 腳位 10 | REF_OUT — Internal 2.5V reference output |
| 腳位 11 | REF_IN — External reference input |
| 腳位 12 | VDD — +5V supply |
| 腳位 13 | DGND — Digital ground |
| 腳位 14 | SCLK — Serial clock input |
| 腳位 15 | CS — Chip select (active low) |
| 腳位 16 | DOUT — Serial data output |
| 腳位 17 | DIN — Serial data input (MUX address) |
| 腳位 18 | PD — Power-down input |
| 腳位 19 | NC — Not connected |
| 腳位 20 | NC — Not connected |
| 腳位 21 | NC — Not connected |
| 腳位 22 | NC — Not connected |
| 腳位 23 | NC — Not connected |
| 腳位 24 | NC — Not connected |
典型應用
ADC10738CIWMX 適用於 6 應用s: Industrial Process Control Loop Monitoring, Portable Digital Multimeters (DMMs), Multi-Channel Temperature and Sensor Data Loggers, Factory Automation Sensor Front End, Battery-Powered Portable Test Instruments, Medical Monitoring and Diagnostic Equipment.
Industrial Process Control Loop Monitoring
The ADC10738CIWMX is well-suited to industrial process control loop monitoring where 4-20 mA current loops from pressure, flow, level, and temperature transmitters must be digitized for a PLC or DCS. The 8-channel analog MUX allows a single ADC IC to sequentially monitor up to 8 loops, reducing BOM cost. With a 250 ohm sense resistor the converter digitizes the standard 1-5V loop span with 10-bit + sign resolution, and the 74 kSPS throughput is more than sufficient for typical 100 ms scan times. The bipolar +/-5V input range and integrated bandgap reference simplify the analog front end, while the wide -40C to +85C operating range supports factory-floor deployment.
推薦
Portable Digital Multimeters (DMMs)
The ADC10738CIWMX is a strong choice for handheld digital multimeters and clamp meters where low power consumption, multi-range measurement, and small PCB area are priorities. The 18 uW power-down current extends battery life in standby mode, and the 5 us conversion time supports fast display updates for continuity and resistance measurements. The 8-channel MUX allows one ADC to digitize voltage, current, and resistance ranges selected by front-panel relays, while the +/-5V input range covers the standard 200 mV to 600 V CAT-III meter ranges when paired with a resistive attenuator. The 24-SOIC wide-body package is easy to hand-prototype and rework.
推薦
Multi-Channel Temperature and Sensor Data Loggers
The ADC10738CIWMX supports 8-channel temperature, humidity, pressure, and strain-gauge data logging systems where multiple sensors must be sampled sequentially and stored for later download. The integrated sample-and-hold amplifier settles in less than 1 us, allowing the host to multiplex 8 thermocouples, RTDs, or load cells with one converter. The 2.5V bandgap reference can be used to drive bridge excitation at low current draw, while the +/-5V input range accommodates the bipolar outputs of many bridge-based sensors. The serial output reduces pin count, leaving more microcontroller I/O for SD card, LCD, or USB interfaces.
推薦
Factory Automation Sensor Front End
The ADC10738CIWMX suits factory automation analog front ends where proximity, photoelectric, and level sensors feed a central PLC. The 8-channel MUX allows up to 8 sensors to share a single ADC IC, with channel selection handled by the host microcontroller over the serial interface. The 37 mW active power consumption is acceptable for DIN-rail modules, and the 5 us conversion time supports typical 1 ms scan rates for 8 channels. The bipolar input range accommodates the 0-10V and 4-20 mA standard industrial signal levels, and the wide operating temperature range tolerates cabinet temperatures up to +85C.
推薦
Battery-Powered Portable Test Instruments
The ADC10738CIWMX fits battery-powered portable test and measurement equipment such as cable testers, gas detectors, and field calibration tools. The 18 uW power-down current preserves battery life in standby, while the 5 us active conversion supports fast measurement updates. The 8-channel MUX allows one ADC to read multiple sensor types (gas, temperature, humidity, flow) in sequence, eliminating the need for multiple ADC ICs. The 24-SOIC wide-body package is straightforward to hand-solder for low-volume production, and the 5V single-supply operation matches the typical Li-ion + boost-converter rail of handheld instruments.
推薦
Medical Monitoring and Diagnostic Equipment
The ADC10738CIWMX can be used in non-critical medical monitoring and diagnostic equipment such as patient scales, blood-pressure cuffs, body-composition analyzers, and laboratory multi-channel analyzers. The 8-channel MUX allows the same ADC to digitize multiple biosignals (pressure, impedance, temperature) sequentially, and the integrated bandgap reference provides the stable 2.5V reference needed for accurate bridge measurements. The 10-bit + sign resolution and 5 us conversion time are sufficient for the 100-200 Hz signal bandwidth typical of slow physiological signals. The -40C to +85C operating range and wide-body SOIC package simplify medical IEC 60601-1 design verification.
推薦
推薦產品摘要
工程參考資料，適用於 ADC10738CIWMX — 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 | ADC10738CIWMX/NOPB | ADC10738CIWM | ADC10158CIWMX/NOPB | ADC10154CIWM | ADC10464CIWMX/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 24-SOIC (WM) | 24-SOIC (WM) - same | 24-SOIC (WM) - same | 24-SOIC (WM) - same | 24-SOIC (WM) - same | 24-SOIC (WM) - same |
| Resolution | 10-bit + sign | 10-bit + sign | 10-bit + sign | 10-bit | 10-bit | 10-bit |
| Sampling Rate | 74 kSPS | 74 kSPS | 74 kSPS | ~77 kSPS | ~25 kSPS | ~200 kSPS |
| Number of Input Channels | 8 (single-ended) / 4 (diff) | 8 / 4 | 8 / 4 | 8 / 4 | 6 / 3 | 1 |
| Input Voltage Range | +/-5V bipolar or 0-5V unipolar | +/-5V / 0-5V | +/-5V / 0-5V | +/-10V bipolar | 0-5V unipolar | +/-5V / 0-5V |
| Internal Reference | 2.5V bandgap, +/-2% | 2.5V bandgap | 2.5V bandgap | 4.096V | External only | 2.5V bandgap |
| Supply Voltage | 5V single | 5V | 5V | +/-5V or 5V | 5V | 5V |
| Data Interface | Serial | Serial | Serial | Serial | Serial | Serial |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
主要差異化特點
- Integrated 8-channel analog MUX reduces BOM cost (對比ADC10464CIWMX/NOPB)
- Bipolar +/-5V input range (對比ADC10154CIWM)
- Low power-down current for battery applications (對比ADC10158CIWMX/NOPB)
設計說明
Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin (pin 12) and a 1 uF to 10 uF low-ESR capacitor on REF_OUT (pin 10). Use a separate analog ground plane that joins the digital ground at a single point near the ADC. Keep analog input traces short and guard them with a ground trace to minimize digital switching noise coupling into the high-impedance MUX inputs.
In power-down mode the ADC10738CIWMX draws only 18 uW, but the wakeup time is typically 10 us before the next valid conversion. For battery-powered portable instruments, drive PD low in standby and high only when needed. The 5V supply should be regulated to within +/-5%; an LDO (e.g. TI LP2985 or TPS7A4700) is recommended rather than a switching converter to avoid coupling switching noise into the SAR comparator.
Do not load REF_OUT with more than a few hundred microamps; the internal reference is designed to drive the REF_IN pin and a small external load only. When using an external precision reference applied to REF_IN, leave REF_OUT floating or apply a 100 nF bypass to AGND. To avoid channel-to-channel crosstalk, do not switch the MUX while the conversion is in progress - read the previous result first, then load the new MUX address in the next serial frame.
合規資訊
Plain ADC10738CIWMX is supplied in leaded matte-tin finish and is not the lead-free RoHS variant; choose ADC10738CIWMX/NOPB for RoHS compliance. REACH and conflict-mineral compliance per Texas Instruments standard supply-chain declarations.
