ADC0831CCN - 8-Bit Serial SAR ADC, 1-Ch | Texas Instruments
料号： ADC0831CCN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.36 | $4.36 |
| 10 | $3.78 | $37.80 |
| 100 | $3.05 | $305.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.24 | $2,240.00 |
ADC0831CCN 概述
An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that resolves each conversion bit-by-bit against a precision internal DAC, achieving a deterministic conversion time independent of input signal. SAR ADCs sit in the hierarchy of data converters (ADC -> Nyquist ADC -> SAR ADC -> precision mixed-signal IC) and are favored for applications demanding low latency, zero pipeline delay, and DC accuracy without the switching noise of delta-sigma architectures. The ADC0831 family is a long-standing 8-bit SAR series originally introduced by National Semiconductor, now maintained under the TI brand.
Key features of the ADC0831CCN include: 8-bit resolution, single differential input, serial (Microwire-compatible) digital output, on-chip sample-and-hold, ratiometric reference option (VREF tied to VCC), low power consumption of approximately 15 mW at 5V, and an operating temperature range of -40 °C to +85 °C. The converter requires only an external reference capacitor and a small RONREF resistor on the REF pin to set the reference voltage. Internally, the part uses a chopper-stabilized architecture for low offset, and the analog input is sampled on the falling edge of the conversion command. The serial data interface allows easy connection to microcontrollers, shift registers, or SPI-compatible controllers with a single chip-select signal.
Typical applications for the ADC0831CCN include industrial process control sensor digitization, battery monitoring and portable instrumentation, panel-meter and digital-panel-meter analog inputs, simple embedded data acquisition, and legacy replacement of older discrete A/D circuits. The 8-bit resolution and ratiometric reference capability make it well-suited for bridge sensors, thermistor networks, and potentiometric measurements where the supply itself defines the full scale. Designers often pair the ADC0831CCN with a microcontroller's general-purpose pins because the serial interface requires only three wires (CS, CLK, DO).
When designing with the ADC0831CCN, ensure the REF pin capacitor (typically 10 µF to 33 µF) and the RONREF resistor (typically 5 kΩ) are sized correctly for the chosen internal clock rate, and decouple VCC with a 0.1 µF ceramic capacitor placed close to the supply pin. Unlike modern 12/24-bit sigma-delta parts, the ADC0831CCN offers 8-bit resolution only, so it should be selected when 8-bit accuracy is sufficient rather than for precision measurement. This page synthesizes distributor availability, drop-in alternatives in the same PDIP-8 footprint, and practical interface notes not consolidated in the manufacturer datasheet.
直接替换替代料： ADC0831CCN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADC0831CCN （相同外形与封装尺寸） ——差异在于 Package, Conversion Time, Mounting Type, RoHS Status, Data Interface.
快速对比工具——选择替代料号进行并排对比：
ADC0831CCN/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
ADC0832CCN
✅ 直接替换✓ 有现货
$3.1 / 个
查看数据手册 →ADC0834CCN
✅ 直接替换📋 参考替代料（不在目录中）
ADC0838CCN
✅ 直接替换📋 参考替代料（不在目录中）
ADC0831CCN 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Channels | 1 (differential) |
| Architecture | SAR (Successive Approximation) |
| Input Type | Differential voltage |
| Analog Input Range | 0 V to 5 V (single-ended); ±VREF (differential) |
| Supply Voltage (VCC) | 4.5 V to 6.3 V |
| Reference Input Type | Ratiometric (VREF tied to VCC supported) |
| Reference Input Resistance | 3.5 kΩ typical |
| Conversion Time | 32 µs typical |
| Digital Interface | Serial (Microwire-compatible, 3-wire: CS, CLK, DO) |
| Power Dissipation | 15 mW typical at 5 V |
| 工作温度范围 | -40 °C to +85 °C |
| 封装 | PDIP-8 (N) |
| 安装类型 | Through-Hole |
| On-Chip Sample-and-Hold | Yes |
| RoHS 状态 | Non-compliant (PDIP-8 lead finish) |
| Lead-Free Finish Option | ADC0831CCN/NOPB available |
ADC0831CCN 引脚配置
| 引脚 1 | CS — Chip Select, active low |
| 引脚 2 | CH0 — Analog input, positive (CH0) |
| 引脚 3 | CH1 — Analog input, negative (CH1) |
| 引脚 4 | GND — Ground |
| 引脚 5 | DO — Serial data output |
| 引脚 6 | CLK — Serial clock input |
| 引脚 7 | VCC — Power supply, 4.5 V to 6.3 V |
| 引脚 8 | VREF — Reference voltage input |
典型应用
ADC0831CCN 适用于 6 应用s: Industrial Sensor Digitization, Battery & Portable Instrumentation, Panel Meter & DPM Analog Input, Embedded Data Acquisition, Legacy Replacement of Older A/D Circuits, Automotive & Harsh Environment Sensing (use indoor plates).
Industrial Sensor Digitization
The ADC0831CCN fits industrial sensor digitization because its 8-bit SAR architecture delivers a deterministic 32 µs conversion time and a 3-wire Microwire interface that any 8-bit/16-bit MCU can read with three GPIOs. The ratiometric reference option lets bridge sensors, thermistors, and potentiometers use VCC as their full-scale reference, eliminating the need for a precision external reference IC. The -40 °C to +85 °C operating range covers most factory-floor enclosures and outdoor cabinets without derating. Compared to delta-sigma ADCs, the SAR architecture adds zero pipeline delay, so a polled sensor can be sampled and acted on in microseconds. Place 0.1 µF ceramic decoupling on VCC and route CH0/CH1 differentially to reject common-mode noise from motor or relay lines.
推荐
Battery & Portable Instrumentation
The ADC0831CCN is well suited to battery and portable instrument applications where cost and PCB area dominate precision. Typical power consumption around 15 mW at 5 V is acceptable for wall-powered or wall-rechargeable systems, and the 8-bit resolution is sufficient for battery voltage state-of-charge estimation (FS/256 ≈ 20 mV per LSB at a 5 V scale). The differential input can be wired to a divider that scales any battery rail (1S Li-ion, 4 V to 18 V lead-acid, etc.) into a 0–5 V window. The Microwire serial interface minimizes MCU pin count, leaving GPIOs free for display, keypad, and comms. Use a 10 µF REF capacitor and a 5 kΩ RONREF resistor per the datasheet to stabilize the internal clock.
推荐
Panel Meter & DPM Analog Input
Digital panel meters (DPMs) and front-panel analog readouts are a natural fit for the ADC0831CCN: the ratiometric reference allows the meter's full-scale to track the supply, and the 8-bit resolution is industry-standard for indicator-style readouts. A panel-meter front end can wire CH0 to a voltage divider from the measured signal, CH1 to ground, and drive the ADC from the host controller's three spare GPIOs. The serial DO pin is ideal for optocoupler isolation if the meter needs to float from the host bus. The 8-pin PDIP-8 footprint is easy to hand-solder on prototype panel-meter boards and is rugged enough for industrial control cabinets. The -40 °C to +85 °C operating range covers indoor and sheltered outdoor installations.
推荐
Embedded Data Acquisition
The ADC0831CCN fits general-purpose embedded data-acquisition tasks on 8051, PIC, AVR, and similar legacy MCU cores that lack an internal ADC. Three GPIOs are enough to drive CS/CLK/DO, and the deterministic 32 µs conversion time yields ~31 kSPS — sufficient for slow analog channels like temperature, light, pressure, and potentiometric knobs. The on-chip sample-and-hold eliminates the need for an external S/H, reducing PCB area to roughly the size of the PDIP-8 plus decoupling. The ratiometric reference supports bridge-type transducers (strain gauge, load cell, NTC thermistor bridges) without a precision ADC reference. For new designs needing > 8 bits, migrate to a 12-bit SAR (e.g., ADS7813UB/1K) on the same 3-wire footprint-compatible SPI bus.
推荐
Legacy Replacement of Older A/D Circuits
Designers maintaining legacy products that used discrete A/D converters or older 8-bit ADCs (e.g., ADC0803/ADC0804 predecessors, ZN448, AD570) can use the ADC0831CCN as a modern replacement that is still in production today. The serial interface reduces PCB trace count from 8–13 (parallel ADCs) down to 3, simplifying board re-spin. The 8-pin PDIP footprint preserves through-hole assembly for hand-rework-friendly service applications. The 5 V supply matches legacy 5 V digital rails common in industrial controls. For CNC rotor tests or motor control feedback, the differential input helps reject common-mode switching noise from PWM bridges.
推荐
Automotive & Harsh Environment Sensing (use indoor plates)
For non-safety automotive cabin electronics, HVAC controls, sensor readouts, and 12 V/24 V body modules, the ADC0831CCN's wide operating temperature range (-40 °C to +85 °C) and 5 V supply tolerance handle under-hood and cabin environments when paired with adequate input protection. The 8-bit resolution is sufficient for cabin-temperature, light-sensor, and potentiometric knob readouts. The differential input rejects common-mode noise from alternator ripple and cranking transients when the divider is properly designed. The PDIP-8 through-hole package withstands vibration better than many SOT-only alternatives. Always add TVS / RC input protection for harsh environments and observe ESD precautions when handling the device.
推荐
推荐产品汇总
工程参考数据： ADC0831CCN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADC0831CCN/NOPB | ADC0832CCN | ADC0834CCN | ADC0838CCN |
|---|---|---|---|---|---|
| Package | PDIP-8 (N) | PDIP-8 (N) - same | PDIP-8 - same | PDIP-8 - same | PDIP-8 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Channels | 1 (differential) | 1 (differential) | 2 (single-ended or differential) | 4 | 8 |
| Supply Voltage | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V |
| Conversion Time | 32 µs typical | 32 µs typical | 32 µs typical | 32 µs typical | 32 µs typical |
| Interface | Microwire / 3-wire serial | Microwire / 3-wire serial | Microwire / 3-wire serial | Microwire / 3-wire serial | Microwire / 3-wire serial |
| RoHS / Pb-Free | SnPb finish (Non-RoHS) | Pb-free matte-tin (RoHS-compliant) | Varies by suffix | Varies by suffix | Varies by suffix |
| 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 |
关键差异点
- Pb-free / RoHS-compliant drop-in replacement exists in the same part number family
- Same family provides channel-count upgrade without changing the serial protocol
- Industry-standard Microwire serial protocol
设计说明
Decouple VCC (Pin 7) with a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin, and add a 10 µF tantalum or aluminum bulk capacitor near the chip for switching-transient suppression. The ADC0831CCN consumes roughly 15 mW typical at 5 V, so a clean 5 V rail is mandatory — noisy USB or LDO-derived rails will inject reference noise that degrades 8-bit linearity. For ratiometric measurements, tie VREF to VCC directly; for absolute measurements, drive VREF from a low-noise external reference.
Route CH0 and CH1 as a tightly-coupled differential pair if using the differential mode, with matched trace lengths and a ground guard trace between adjacent noisy lines. Place the 10 µF REF capacitor (CREF) and the RONREF resistor (typically 5 kΩ) close to the VREF pin — long traces pick up digital switching noise that mixes into the conversion. Keep digital lines (CS, CLK, DO) at least 3 mm away from analog traces to minimize digital-to-analog crosstalk. The PDIP-8 footprint tolerates wide PCB tolerances, but keep analog ground returns continuous and avoid splitting ground planes under the chip.
Do not exceed the absolute maximum VCC of 6.3 V — even brief overvoltage transients from hot-plug or load-dump events can permanently damage the analog switches. Do not leave the VREF pin floating; it must be connected to a DC voltage source with at least 3.5 kΩ source impedance. Do not apply analog inputs > VCC + 0.3 V; the input ESD diodes will forward-bias and inject current into the supply. For the differential channel, keep common-mode voltage within the VCC rails. Finally, do not operate the ADC0831CCN below 4.5 V — the SAR logic may miscount clocks, producing invalid data.
合规信息
ADC0831CCN uses SnPb (tin-lead) finish and is non-RoHS; the ADC0831CCN/NOPB suffix designates the Pb-free RoHS-compliant variant. Not qualified for AEC-Q100 automotive use. REACH compliance status verified per TI product page (Dec 2025). For RoHS-compliant production, choose ADC0831CCN/NOPB as the drop-in replacement.
