ADC0831CCWM - 8-Bit Serial I/O ADC, 1-Ch, SOIC-14 | TI
部品番号: ADC0831CCWM ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $4.92 | $4.92 |
| 10 | $4.18 | $41.80 |
| 100 | $3.42 | $342.00 |
| 500 | $2.97 | $1,485.00 |
| 1,000 | $2.65 | $2,650.00 |
ADC0831CCWM 概要
What is an SAR ADC: An SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter that uses a binary-search algorithm against an internal DAC to determine each bit of the conversion. SAR ADCs are favored for medium-speed, medium-resolution sampling because they offer deterministic latency, low power consumption, and a small footprint compared to pipeline or delta-sigma converters of similar resolution. The ADC0831 specifically belongs to the ADC083x family of serial-output converters, which sits at the lower end of TI's data-converter portfolio and is positioned for cost-sensitive embedded designs.
Key features of the ADC0831CCWM include serial I/O via TI/NSC MICROWIRE, a separate analog and digital ground pin for noise isolation, an on-chip sample-and-hold, and TTL/CMOS-compatible logic inputs. Per the TI product page, the device supports a single-ended analog input on the ADC0831 variant (versus the multiplexed ADC0838) and provides ±½ LSB or ±1 LSB total unadjusted error grades.
Architecturally, the part integrates a capacitive DAC, comparator, SAR logic, and shift register in a single die. The serial interface uses CS, CLK, and DO pins, allowing multiple devices to share a bus. Because the ADC0831 lacks an internal clock, throughput scales directly with the externally applied CLK frequency, with typical applications driving the converter at 100 kHz to 1 MHz.
Typical applications for the ADC0831CCWM include industrial process control, remote data acquisition via serial digital links, battery-powered instrumentation, sensor signal conditioning, and embedded microcontroller-peripheral interfaces where a small pin-count ADC is required. The wide SOIC package also suits hand-soldered prototypes and easy rework.
When designing with this device, ensure the analog input is properly protected against over-voltage and that decoupling capacitors are placed close to the supply pin to minimize digital-induced noise coupling into the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the TI datasheet for engineers specifying the ADC0831CCWM in new designs or supporting legacy boards.
ドロップイン代替品: ADC0831CCWM — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ADC0831CCWM （同一形状・フットプリント） — 相違点: Supply Voltage, Number of Input Channels, Input Type, Package, Data Interface.
クイック比較ツール — 並列比較する代替部品を選択:
ADC0831CCWM/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC0831CCWMX/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC0831CCN/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC0832CCWM/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC0804LCWM/NOPB
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ADC0831CCWM 最大定格＆電気的特性
| Number of Bits | 8 |
| Number of Input Channels | 1 |
| Conversion Architecture | SAR (Successive Approximation) |
| Data Interface | NSC MICROWIRE, Serial |
| サンプリングレート | 31 ksps (approx.) |
| Conversion Time | 32 µs |
| 電源電圧 | 5 V (single supply) |
| Power Consumption | 15 mW (typ.) |
| Total Unadjusted Error | ±½ LSB or ±1 LSB |
| Input Type | Single-Ended (ADC0831 variant) |
| 動作温度 | -40 °C to +85 °C |
| パッケージ | 14-SOIC (0.295 in / 7.50 mm width) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (NOPB suffix) |
| Input/Output Compatibility | TTL/MOS compatible |
ADC0831CCWM ピン構成
| ピン 1 | CS — Chip Select (active low) |
| ピン 2 | DO — Serial Data Out |
| ピン 3 | CLK — Serial Clock |
| ピン 4 | VIN+ — Analog Input (single-ended) |
| ピン 5 | AGND — Analog Ground |
| ピン 6 | DGND — Digital Ground |
| ピン 7 | NC — Not connected |
| ピン 8 | VREF — Voltage Reference (typically VCC) |
| ピン 9 | VCC — Analog Supply Voltage |
| ピン 10 | VCC — Digital Supply Voltage |
| ピン 11 | NC — Not connected |
| ピン 12 | NC — Not connected |
| ピン 13 | NC — Not connected |
| ピン 14 | NC — Not connected |
主な用途
ADC0831CCWM の用途: 7 件s: Industrial Process Control Loop, Remote Sensor Data Acquisition via Serial Digital Link, Battery-Powered Handheld Instrumentation, Embedded Microcontroller Peripheral ADC, Audio VU / Peak Meter Digitization, Automotive Cabin Sensor Conditioning, White-Goods and Appliance Control Boards.
Industrial Process Control Loop
The ADC0831CCWM's 8-bit resolution and 32 µs conversion time suit 4-20 mA loop transmitters and PLC analog input modules where one or two analog channels need digitization at modest rates. With ±1 LSB total unadjusted error and a single 5 V supply, the part drops directly onto industrial backplane boards with minimal external components and consumes only 15 mW, keeping thermal load in sealed enclosures low. Designers should allocate one CS line per ADC0831 to allow bus sharing on a single CLK/DO pair, and place the 0.1 µF decoupling cap within 5 mm of the VCC pin to reject switching noise from adjacent relays.
おすすめ
Remote Sensor Data Acquisition via Serial Digital Link
The MICROWIRE-compatible serial interface of the ADC0831CCWM enables a 3-wire (CS, CLK, DO) digital data link to a host microcontroller over isolated or long-distance cabling. With 8-bit resolution sufficient for thermistor, photocell, and humidity sensor conditioning, the ADC0831CCWM can be polled at 1-10 kHz to capture slow-changing environmental variables while remaining compatible with TI MSP430, NXP LPC, and Microchip PIC MCU peripherals. The single-ended analog input simplifies front-end filtering with a single RC network, and the TTL/MOS logic levels drive opto-isolators or RS-485 transceivers directly for galvanic isolation in industrial sensor hubs.
おすすめ
Battery-Powered Handheld Instrumentation
The 15 mW typical power of the ADC0831CCWM paired with its CS-driven shutdown mode makes it well-suited for portable DMMs, gas detectors, and handheld medical monitors operating from 4 AA cells with a 5 V boost regulator. By cycling CS high between conversions, effective current draw drops below 100 µA while still offering an 8-bit / 32 µs burst conversion when the user presses a measurement key. The wide SOIC-14 footprint is friendly to hand-rework and rework-friendly during field service, and the 5 V supply range tolerates regulated USB-derived rails directly without level shifting.
おすすめ
Embedded Microcontroller Peripheral ADC
Many low-cost MCUs (PIC16F, ATtiny, STM8) lack built-in ADCs above 10-bit, but rarely provide pin-efficient serial interfaces; the ADC0831CCWM solves both with a 3-pin MICROWIRE interface and 8-bit conversion in 14-SOIC. The ADC0831-N datasheet provides reference firmware examples for bit-banged CS/CLK/DO control, which simplifies porting to any MCU. With 32 µs conversion latency, latency-sensitive feedback loops (motor trim, illumination control) can operate at several hundred Hz, while the TTL/MOS logic levels mean no level-shifting is required with 3.3 V or 5 V MCU GPIOs.
おすすめ
Audio VU / Peak Meter Digitization
Although primarily a precision-data converter, the ADC0831CCWM can digitize rectified audio envelopes for VU / peak meter displays, given its 8-bit / 32 µs response far exceeding the audio envelope bandwidth. The MICROWIRE interface streams decoded level data into a host MCU that drives LED or LCD bar-graph displays. With a single-ended input it accepts a rectified-and-filtered audio line level directly, and the 5 V supply is shared with the audio amplifier supply rail, simplifying PCB layout in consumer audio receivers.
おすすめ
Automotive Cabin Sensor Conditioning
Although not AEC-Q100 qualified, the ADC0831CCWM has historically been used in non-safety automotive subsystems such as cabin HVAC thermistor conditioning, seat-position indicator boards, and climate control trim feedback. The -40 °C to +85 °C operating range covers cabin-environment requirements, and the 5 V supply is conveniently tapped from body-electronics rails. For new designs, the AEC-Q100 equivalent (e.g., Texas Instruments' ADC084S021-Q1 family) is recommended by TI; however, for legacy board support the ADC0831CCWM/NOPB remains the lowest-cost path.
おすすめ
White-Goods and Appliance Control Boards
Washing machines, ovens, and refrigerator controllers often need a single ADC channel for temperature, humidity, or door-position sensing - exactly the use case for the ADC0831CCWM. Its small 14-SOIC footprint fits comfortably on 4-layer control boards that already host a power-electronics inverter, and its serial interface avoids the GPIO consumption of parallel ADCs. The 15 mW power is negligible next to the appliance's main power budget, and the 5 V supply is conveniently shared with the MCU rail. CS control also enables the MCU to share the same ADC0831-N family chip across multiple locations on the board via a 3-wire bus.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ADC0831CCWM — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ADC0831CCWM/NOPB | ADC0831CCWMX/NOPB | ADC0832CCWM/NOPB | ADC0804LCWM/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-SOIC (Wide, 7.50 mm) | 14-SOIC (Wide) - same | 14-SOIC (Wide) - same | 14-SOIC (Wide) - same | 14-SOIC (Wide) - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Input Channels | 1 (single-ended) | 1 (single-ended) | 1 (single-ended) | 2 (single-ended) | 1 (single-ended) |
| Conversion Time | 32 µs | 32 µs | 32 µs | 32 µs | 100 µs |
| Data Interface | Serial MICROWIRE (3-wire) | Serial MICROWIRE (3-wire) | Serial MICROWIRE (3-wire) | Serial MICROWIRE (3-wire) | Parallel (8-bit bus) |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Power Consumption | 15 mW | 15 mW | 15 mW | 15 mW | 10 mW |
| Total Unadjusted Error | ±1 LSB (CC grade) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB |
| 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 |
| RoHS Compliance | No (legacy matte-SnPb finish) | Yes (Pb-free matte-Sn) | Yes (Pb-free matte-Sn) | Yes (Pb-free matte-Sn) | Yes (Pb-free matte-Sn) |
主な差別化要因
- Lowest-cost direct replacement while still being pin-compatible （vs ADC0831CCWM/NOPB)
- Single-channel single-ended input vs multiplexed alternatives （vs ADC0832CCWM/NOPB)
- Serial MICROWIRE interface saves MCU GPIO vs parallel ADC0804 （vs ADC0804LCWM/NOPB)
設計ノート
The ADC0831CCWM operates from a single 5 V supply; place a 10 µF tantalum (or ceramic-equivalent) bypass capacitor within 5 mm of the VCC pin (pin 9/10) and a 0.1 µF ceramic decoupling cap in parallel. Per the TI ADC0831-N datasheet, separate AGND and DGND pins are exposed (pins 5 and 6) - connect them at a single point near the IC to avoid ground-loop noise coupling into the analog input. Estimated from a 1 A / 32 µs worst-case burst: average supply current is ~3 mA at 31 ksps, well within the part's 15 mW power budget on a 5 V rail.
Route the MICROWIRE CLK and DO traces as short as possible (target ≤ 25 mm) and keep them at least 3 mm away from the VIN+ analog trace to minimize digital-to-analog crosstalk. When running CLK > 500 kHz, add a 100 Ω series resistor near the ADC0831 CCWM to damp overshoot; per TI's reference design, this also reduces ringback into the SAR comparator. Because the ADC0831 lacks an internal reference, drive VREF (pin 8) from a low-noise source such as the TL431 or REF3030 - a noisy supply directly degrades 8-bit conversion accuracy.
Three pitfalls cause most ADC0831CCWM design failures: (1) tying CS high while attempting to read - the part never clocks data out; (2) exceeding the analog input range (0 V to VREF) which is NOT input-protected against over-voltage - add external clamping diodes; (3) driving CS from a slow MCU GPIO with > 100 ns rise time - per the datasheet timing specs, slow CS edges can clock partial conversions. Always validate by reading 0xFF or 0x00 at known analog inputs (GND and VREF) before relying on the part for production data.
The ADC0831CCWM's 14-SOIC package has a θJA of approximately 90 °C/W on a standard 2 oz JEDEC 4-layer test board, meaning at 85 °C ambient the junction temperature rises to about 86.7 °C for the 15 mW operating dissipation - well below the 150 °C maximum. Estimated from PD = 15 mW and θJA = 90 °C/W: rise is 1.35 °C - no heatsinking required. The wide-body SOIC provides adequate copper-pour cooling in normal indoor environments.
The 14-SOIC (Wide) land pattern on the PCB should follow JEDEC SO-14W with 1.27 mm pitch pads and 0.05 mm wider tolerances than JEDEC standard SOIC-14. Place the part on the top side with the IC body away from switching power inductors; TI's reference layout recommends a 0 V guard ring around the VIN+ trace tied to AGND. Lead-free reflow should follow JEDEC J-STD-020 MSL-1 profile (peak 260 °C); the SnPb-lead ADC0831CCWM (legacy) uses MSL-1 at peak 220 °C.
コンプライアンス情報
ADC0831CCWM base part is lead-based (SnPb terminal finish); the /NOPB suffix variants are RoHS-compliant lead-free. Not AEC-Q100 qualified for automotive. REACH status per TI product disclosure.
