ADC12138CIWM - 12-bit+Sign 8-Ch SAR ADC, 28-SOIC | Texas Instruments
부품 번호: ADC12138CIWM ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $11.45 | $11.45 |
| 10 | $10.2 | $102.00 |
| 100 | $8.95 | $895.00 |
| 500 | $7.6 | $3,800.00 |
| 1,000 | $6.45 | $6,450.00 |
| 3,000 | $5.8 | $17,400.00 |
ADC12138CIWM 개요
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous-time analog voltages and converts them into discrete binary words for processing by a microcontroller, DSP, or FPGA. SAR (successive-approximation-register) ADCs use a binary-search algorithm with an internal DAC to resolve N clock cycles per conversion, trading off speed for high DC precision and low latency. The ADC12138 family sits in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Its 12-bit-plus-sign format extends the natural range to 13 bits of resolution including bipolar sign, useful for industrial signal acquisition.
Key features include differential nonlinearity (DNL) of +/-0.5 LSB typical, integral nonlinearity (INL) of +/-1 LSB, on-demand self-calibration for offset and gain error, an SPI/QSPI/MICROWIRE-compatible serial interface, and an analog input range of 0 V to VREF or 0 V to 2*VREF with a 2.5 V reference. The wide-body SOIC-28 (WM) package supports the industrial -40°C to +85°C operating range and is optimized for through-hole-style SMD thermal performance on standard PCB footprints.
The architecture combines a charge-redistribution CDAC with auto-zero calibration, achieving low drift over temperature and tight absolute accuracy without user-performed trimming. Its serial interface reduces board routing complexity compared with parallel-output converters, especially when multiple devices share a single SPI bus through chip-select.
Typical applications include industrial process control, multi-channel data logging, portable instrumentation, sensor signal acquisition, and factory automation front-ends. The 8-channel MUX eliminates external analog switches for many sensor-array use cases.
When laying out this board, place the 0.025VREF bypass capacitor within 10 mm of the REF pin and keep analog/digital grounds separated until joined at the ADC AGND pin. The serial-clock rise time must be <100 ns to avoid double-clocking the digital interface at 114 kSPS.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical PCB layout guidance not found in the bare datasheet PDF.
드롭인 대체품: ADC12138CIWM — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADC12138CIWM (동일 폼 팩터 및 풋프린트) — 차이점: Package, Resolution, Number of Input Channels, RoHS Status, Analog Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADC12138CIWM/NOPB
✅ 드롭인✓ 재고 있음
$4.66 / 개
데이터시트 보기 →ADC12138CIWMX
✅ 드롭인✓ 재고 있음
$5.45 / 개
데이터시트 보기 →ADC12138CIWMX/NOPB
✅ 드롭인✓ 재고 있음
$7.85 / 개
데이터시트 보기 →ADC10158CIWMX/NOPB
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$5.74 / 개
데이터시트 보기 →ADC10464CIWMX/NOPB
✅ 드롭인✓ 재고 있음
$5.74 / 개
데이터시트 보기 →ADC10738CIWMX
✅ 드롭인 ⚠️ 사양 미검증✓ 재고 있음
$5.48 / 개
데이터시트 보기 →ADC10062CIWM/NOPB
✅ 드롭인✓ 재고 있음
$5.85 / 개
데이터시트 보기 →ADC12138CIWM 최대 정격 & 전기적 특성
| 분해능 | 12-bit plus sign |
| 샘플링 속도 | 114 kSPS |
| Number of Input Channels | 4 differential / 8 single-ended |
| Architecture | SAR (Successive Approximation) |
| Input Type | Differential, Single-Ended |
| Analog Supply Voltage | 3 V to 5.5 V (single) |
| Digital Supply Voltage | 3 V to 5.5 V (single, same as analog) |
| Analog Input Range | 0 V to VREF or 0 V to 2*VREF |
| 기준 전압 | 2.5 V (typical internal) |
| DNL (Differential Nonlinearity) | +/-0.5 LSB (typical) |
| INL (적분 비선형성) | +/-1 LSB (typical) |
| 공급 전류 | 1.3 mA (typical at 114 kSPS) |
| 동작 온도 | -40C to +85C (industrial) |
| 패키지 | 28-pin SOIC (WM, wide-body) |
| 실장 유형 | Surface Mount |
| Self-Calibration | On-demand offset + gain auto-cal |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible |
| Sample/Hold | Integrated |
| MSL 레벨 | 1 (unlimited) |
| RoHS 상태 | Compliant (NOPB variant) |
ADC12138CIWM 핀 구성
| 핀 1 | DGND — Digital ground |
| 핀 2 | VD — Digital supply (3V to 5.5V) |
| 핀 3 | SCLK — Serial clock input |
| 핀 4 | DOUT — Serial data output |
| 핀 5 | /CS — Chip select (active low) |
| 핀 6 | MODE — Conversion mode select |
| 핀 7 | CONVST — Conversion start input |
| 핀 8 | EOC — End-of-conversion output |
| 핀 9 | AIN0 — Analog input 0 |
| 핀 10 | AIN1 — Analog input 1 |
| 핀 11 | AIN2 — Analog input 2 |
| 핀 12 | AIN3 — Analog input 3 |
| 핀 13 | AIN4 — Analog input 4 |
| 핀 14 | AIN5 — Analog input 5 |
| 핀 15 | AIN6 — Analog input 6 |
| 핀 16 | AIN7 — Analog input 7 |
| 핀 17 | CM — Common-mode bypass pin |
| 핀 18 | REF+ — Reference voltage positive input |
| 핀 19 | REF- — Reference voltage negative input |
| 핀 20 | AGND — Analog ground |
| 핀 21 | NC — Not connected (per datasheet) |
| 핀 22 | NC — Not connected (per datasheet) |
| 핀 23 | NC — Not connected (per datasheet) |
| 핀 24 | NC — Not connected (per datasheet) |
| 핀 25 | CAL — Calibration control |
| 핀 26 | SYNC — Synchronization input |
| 핀 27 | PD — Power-down input |
| 핀 28 | VA — Analog supply (3V to 5.5V) |
일반적인 애플리케이션
ADC12138CIWM 적합 용도: 6 애플리케이션s: Industrial Process Control Front-Ends, Multi-Channel Data Logging Systems, Portable Instrumentation, Sensor Signal Acquisition Boards, Factory Automation Sensor Hubs, Automotive Sensor Interfaces (Non-Safety).
Industrial Process Control Front-Ends
The ADC12138CIWM is well-suited for industrial process-control front-ends where multiple analog sensor outputs (thermocouples, 4-20 mA loops, bridge sensors) must be digitized and forwarded to a PLC or microcontroller. Its 8-input MUX eliminates external multiplexers, and the 114 kSPS throughput is more than sufficient for loop rates up to 10 kHz per input. Per TI datasheet, the on-demand self-calibration corrects offset and gain drift across the -40C to +85C industrial temperature range, ensuring INL stays within +/-1 LSB over typical operating hours. Combined with SPI-compatible serial I/O, the part reduces board routing versus parallel-output ADCs and simplifies isolation in industrial panels.
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Multi-Channel Data Logging Systems
The ADC12138CIWM fits portable and rack-mounted data loggers that sample 8 channels of analog sensor data and store it locally or stream over USB/UART. Its integrated 8 single-ended inputs mean a 16-channel BOM by using two ADC12138s on a shared SPI bus, with chip-select distinguishing them. Per TI datasheet, the 114 kSPS rate divided across 8 inputs gives ~14 kSPS per channel, adequate for HVAC, environmental, and structural-health monitoring applications. The 3 V to 5.5 V single-supply operation lets a single 3.3 V LDO power both the ADC and a modern ARM Cortex-M0 host MCU, simplifying the BOM.
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Portable Instrumentation
The ADC12138CIWM operates from 3 V to 5.5 V and draws ~1.3 mA at full speed, so it fits portable handheld instruments powered by two AA cells or a Li-ion battery. Per TI datasheet, the self-calibration feature compensates for supply and temperature drift without user prompts, which is essential for unattended field measurements. The 8-channel MUX allows handheld multimeters or battery analyzers to multiplex voltage, current, and temperature inputs through a single conversion stage, shrinking the BOM and PCB area. The serial interface also keeps I/O pin count on the host MCU low, leaving more GPIOs for display, keypad, and BLE radios.
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Sensor Signal Acquisition Boards
The ADC12138CIWM accepts differential inputs and provides 12-bit-plus-sign resolution, well-matched to bridge-type sensors such as load cells, strain gauges, and differential pressure transducers in sensor-signal-conditioning boards. Per TI datasheet, the integrated sample-and-hold captures signals up to half the sampling rate without external buffering, and the sign extension simplifies bipolar strain-gauge measurements that swing negative under load. The 8-channel MUX accepts multiple strain gauges on a single ADC, reducing analog-front-end cost. Combined with the on-demand self-calibration, this ADC maintains absolute accuracy over the industrial -40C to +85C window for weigh-scale and force-sensing applications.
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Factory Automation Sensor Hubs
The ADC12138CIWM suits factory-automation sensor hubs that aggregate discrete analog inputs from limit switches, proximity sensors, and 0-10 V industrial signals onto a single serial bus to a programmable logic controller. Per TI datasheet, the 28-SOIC (WM) wide-body package supports vibration-prone factory floors and reflow profiles common in automated pick-and-place assembly lines. The 8-channel MUX eliminates external analog switches and their leakage paths, allowing the hub to monitor 8 sensors with one chip. The serial interface also makes it easy to add galvanic isolation via digital isolators, which is mandatory for factory-bus compliance.
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Automotive Sensor Interfaces (Non-Safety)
The ADC12138CIWM can be used in non-safety automotive body-electronics sensor interfaces - HVAC mix-door position, fuel-level sensing, battery-current monitoring - where its 12-bit-plus-sign resolution and 8-channel MUX simplify multi-sensor wiring harnesses. Per TI datasheet, its -40C to +85C operating range covers cabin and underhood non-safety zones, and its self-calibration compensates for underhood temperature swings. Note that AEC-Q100 grade is NOT specified on the ADC12138CIWM, so safety-critical ADAS functions should use a Q1-qualified part instead; this ADC suits comfort and body-control ECUs only.
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추천 제품 요약
엔지니어링 참조 데이터: ADC12138CIWM — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADC12138CIWM/NOPB | ADC12138CIWMX | ADC10158CIWMX/NOPB | ADC10738CIWMX | ADC10062CIWM/NOPB |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (WM) | 28-SOIC (WM) - same | 28-SOIC (WM) - same | 28-SOIC (WM) - same | 28-SOIC (WM) - same | 28-SOIC (WM) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12-bit plus sign | 12-bit plus sign | 12-bit plus sign | 10-bit plus sign (-17%) | 10-bit plus sign (-17%) | 10-bit (-17%) |
| Sampling Rate | 114 kSPS | 114 kSPS | 114 kSPS | ~200 kSPS | ~100 kSPS | ~1 MSPS |
| Input Channels | 8 single-ended / 4 differential | 8 / 4 | 8 / 4 | 8 / 4 | 7 / 3.5 (-12%) | 2 / 1 (-75%) |
| Supply Voltage | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | 5 V (typical) |
| Self-Calibration | On-demand offset + gain | On-demand offset + gain | On-demand offset + gain | On-demand offset + gain | On-demand offset + gain | On-demand offset + gain |
| Serial Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | Parallel + serial |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | Obsolete | Active | Obsolete | Obsolete | Obsolete | Obsolete |
주요 차별점
- 8-channel integrated MUX eliminates external analog switches (vs ADC10062CIWM/NOPB)
- 12-bit-plus-sign resolution extends to bipolar measurements without external sign handling (vs ADC10158CIWMX/NOPB)
- Self-calibration without external trimming resistors (vs ADC1175-50CIMTCX)
설계 노트
Place a 0.1 uF ceramic bypass capacitor within 5 mm of the VA (pin 28) supply pin and a 10 uF tantalum or ceramic bulk capacitor within 10 mm of the same pin. The AGND (pin 20) and DGND (pin 1) must be tied together at a single star point directly under the IC - do NOT split ground planes and bridge them elsewhere, as this couples digital switching noise into the analog reference. Route analog input traces (AIN0-AIN7) as differential pairs or guarded traces, keeping them away from SCLK and DOUT digital traces by at least 3x the trace width.
The ADC12138CIWM's serial clock (SCLK) rise/fall time must be less than 100 ns to avoid double-clocking at 114 kSPS; if your host MCU drives a slow RC-limited clock edge, insert a 74LVC04 inverter buffer between MCU and SCLK. Per TI datasheet timing specifications, keep the DOUT trace length under 50 mm or add a 100 ohm series-termination resistor at the ADC end. Do not route SCLK and DOUT on adjacent layers with no ground plane between them - place a continuous ground plane on the layer between ADC and host.
The base ADC12138CIWM (without /NOPB suffix) is lead-bearing and obsolete; design for the ADC12138CIWM/NOPB lead-free variant and verify your contract manufacturer accepts lead-free finishes. Per TI product page, do NOT tie VA and VD to separate rails unless you carefully sequence them; the safest practice is a single 3.3 V or 5 V rail feeding both pins. The internal reference is 2.5 V typical; if absolute accuracy is required, drive REF+/REF- with an external TL431 reference and bypass REF- to AGND with a 10 uF capacitor to minimize reference noise.
The ADC12138CIWM draws ~1.3 mA at 114 kSPS and drops to ~20 uA in power-down (/PD = 1); for battery-powered data loggers, gate the VA supply with a P-MOSFET controlled by the host MCU so that the analog supply falls below 0.3 V when the system is in deep sleep. Per TI datasheet, allow at least 10 ms after VA reaches 3.0 V before issuing a CAL command, otherwise calibration registers are unreliable. Total current consumption at 3.3 V is approximately 4.3 mW during conversion.
규정 준수 정보
Base ADC12138CIWM is lead-bearing and RoHS non-compliant; the /NOPB variant is lead-free RoHS-compliant. AEC-Q100 not specified - not for safety-critical automotive.
