ADC12H038CIWM/NOPB - 12-Bit+Sign 8-Ch SAR ADC | Texas Instruments
N.º de pieza: ADC12H038CIWM/NOPB ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $11.42 | $11,42 |
| 10 | $10.21 | $102,10 |
| 100 | $8.85 | $885,00 |
| 500 | $7.42 | $3.710,00 |
| 1.000 | $6.18 | $6.180,00 |
ADC12H038CIWM/NOPB Descripción general
An SAR ADC is a type of analog-to-digital converter that uses a binary-weighted capacitor network and a comparator to perform a bit-by-bit successive search of internal voltage. The ADC12H038 belongs to the data-converter family within the broader mixed-signal and signal-chain IC category, sharing its taxonomy with delta-sigma, pipeline, and flash converters. Its built-in MUX and sample/hold let one ADC serve multiple analog sources, which is a common reason engineers choose SAR over a per-channel dedicated ADC.
Key features include 12-bit resolution plus sign extension (yielding 13 bits of effective dynamic range when measuring bipolar signals), an 8-channel single-ended or 4-channel differential input MUX, an integrated sample-and-hold, on-chip self-calibration, and a MICROWIRE-compatible serial interface. The serial I/O reduces pin count versus parallel-output ADCs, enabling 28-SOIC packaging rather than the wider 40- or 44-pin alternatives typically required for 12-bit parallel parts. Input ranges are bipolar-friendly thanks to the sign-bit output, and the part operates from a single 5 V analog supply with 5 V digital I/O.
The device is built on a CMOS SAR architecture with a capacitive DAC ladder, which inherently provides no pipeline latency and allows the ADC to be multiplexed across many channels with deterministic per-channel conversion time. Self-calibration runs at power-up and on demand via a software command, measuring internal offset and gain errors and storing correction coefficients, which simplifies manufacturing and supports industrial temperature grades (-40 °C to +85 °C).
Typical applications include industrial process control and instrumentation, portable battery-powered measurement, multi-sensor data logging, programmable logic controllers (PLC) analog input modules, automotive sensor interface boards, and portable medical monitoring equipment. The integrated MUX and self-calibration specifically suit cost-sensitive multi-channel designs.
When designing with this device, decouple VCC and VREF separately with 0.1 µF ceramic capacitors placed close to the pins, and keep digital return currents isolated from analog ground using a star-ground or split-plane layout. Do not exceed the maximum sampling rate without ensuring the source impedance is low enough to settle the input within the acquisition window.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para ADC12H038CIWM/NOPB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ADC12H038CIWM/NOPB (mismo factor de forma y huella) — difiere en Architecture, Number of Input Channels, Package, Resolution, Data Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADC12H038CIWMX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12L038CIWM/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12038CIWM/NOPB
✅ Sustitución directa✓ En stock
$9.4 / unidad
Ver hoja de datos →ADC12038CIWMX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12138CIWM/NOPB
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$4.66 / unidad
Ver hoja de datos →ADC12H038CIWM/NOPB Valores máximos y características eléctricas
| Resolución | 12 bit + sign (13-bit effective dynamic range) |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 8 single-ended / 4 differential (MUX) |
| Sample Rate | 182 ksps |
| Sample/Hold | Integrated |
| Self-Calibration | Yes (on-chip, automatic at power-up and on demand) |
| Data Interface | MICROWIRE-compatible serial I/O |
| Rango de tensión de entrada | 0 V to VREF (single-ended); VREF/2 with sign bit |
| Tensión de alimentación | 5 V (single supply) |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C (Industrial) |
| Encapsulado | 28-SOIC (IWM, 0.295 in / 7.50 mm width) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de ADC12H038CIWM/NOPB
| Pin 1 | CH0 — Analog input channel 0 |
| Pin 2 | CH1 — Analog input channel 1 |
| Pin 3 | CH2 — Analog input channel 2 |
| Pin 4 | CH3 — Analog input channel 3 |
| Pin 5 | CH4 — Analog input channel 4 |
| Pin 6 | CH5 — Analog input channel 5 |
| Pin 7 | CH6 — Analog input channel 6 |
| Pin 8 | CH7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | VREF — Reference voltage input |
| Pin 11 | VCC — +5 V analog supply |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | DGND — Digital ground |
| Pin 14 | SCLK — Serial clock input |
| Pin 15 | DOUT — Serial data output (ADC -> host) |
| Pin 16 | STR — Strobe / data ready output |
| Pin 17 | DIN — Serial data input (host -> ADC config) |
| Pin 18 | CS — Chip select (active low) |
| Pin 19 | CAL — Calibration trigger input |
| Pin 20 | MODE — Mode select input |
| Pin 21 | MUX0 — Mux address bit 0 |
| Pin 22 | MUX1 — Mux address bit 1 |
| Pin 23 | MUX2 — Mux address bit 2 |
| Pin 24 | AGND — Analog ground (second bond) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | NC — Not connected (per datasheet) |
| Pin 28 | NC — Not connected (per datasheet) |
Aplicaciones típicas
ADC12H038CIWM/NOPB es adecuado para 7 aplicacións: Industrial Process Control PLCs, Portable Battery-Powered Measurement, Multi-Sensor Data Acquisition Boards, Automotive Sensor Interface Modules, Medical Patient Monitoring, Programmable Logic Controller (PLC) Analog Input, HVAC and Building Automation.
Industrial Process Control PLCs
The ADC12H038CIWM/NOPB fits industrial PLC analog-input modules because its 8-channel integrated MUX allows one ADC to digitize up to eight 4-20 mA or 0-10 V signals from thermocouples, pressure transducers, or flow meters without external switching. The on-chip self-calibration corrects offset and gain drift caused by ambient temperature swings from -40 °C to +85 °C, eliminating the manual trimpot tuning that traditionally bogs down production test. With a 182 ksps throughput, the converter easily covers the 100 Hz - 1 kHz bandwidth of typical process-control signals, and the MICROWIRE-compatible serial interface connects directly to common PLC microcontrollers. Powered from a single 5 V rail, the part integrates into standard PLC backplane supplies without a separate analog LDO.
Recomendado
Portable Battery-Powered Measurement
The ADC12H038CIWM/NOPB suits handheld multimeters and portable data loggers because its on-demand self-calibration wakes the part from standby, runs a fresh offset/linearity correction, and returns to low-power mode in microseconds - a workflow impossible with discrete-ADC + external-trimpot designs. The 28-SOIC small footprint fits inside handheld enclosures, and the 5 V supply rail aligns with common 4-cell NiMH or single-cell Li-ion boost converters. Eight input channels let a portable instrument digitize voltage, current, temperature, and frequency-multiplexer outputs without external analog switches. The serial MICROWIRE interface shares pins with the host microcontroller's SPI peripheral, conserving GPIOs in pin-constrained portable designs.
Recomendado
Multi-Sensor Data Acquisition Boards
The ADC12H038CIWM/NOPB is well-suited for multi-sensor data acquisition systems where strain gauges, thermocouples, RTDs, and load cells share a single board. Its 8-channel MUX lets one ADC service all sensor inputs sequentially, while the integrated self-calibration ensures gain/offset accuracy stays within spec as the PCB temperature drifts under sensor self-heating. The 12-bit + sign dynamic range handles bipolar sensor outputs (e.g., strain gauge ±VREF/2) without external signal conditioning or level shifting. The 28-SOIC package provides enough thermal margin for the converter even when mounted near heat-generating sensor front-ends, and the MICROWIRE-compatible interface ties cleanly to FPGA or DSP backbones used in modern data-acquisition boards.
Recomendado
Automotive Sensor Interface Modules
The ADC12H038CIWM/NOPB fits automotive sensor interface boards for body-control modules and HVAC controls where multiple analog sensors (temperature, pressure, position) feed a single PCB. Eight channels let one converter handle the typical 4-6 sensor count plus diagnostic channels without external MUX. The -40 °C to +85 °C industrial temperature grade covers most cabin and under-hood positions; for under-hood AEC-Q100 needs, consider the automotive-qualified variants. The MICROWIRE serial interface simplifies firmware-driven diagnostics because calibration can be re-triggered on each power-up cycle, recovering any drift accumulated during cold-crank or load-dump transients. The 28-SOIC footprint keeps the BOM compact for space-constrained automotive PCBAs.
Recomendado
Medical Patient Monitoring
The ADC12NELF-style devices including the ADC12H038 family fit medical monitoring equipment such as bedside patient monitors and portable ECG/event recorders where 4-8 analog channels are needed for ECG, SpO2, temperature, respiration, and cuff-pressure measurements. The on-chip self-calibration ensures accuracy without manual trimpot adjustments, a benefit for ISO 13485 manufacturing processes. The 12-bit + sign resolution captures the 5 mV - 5 V dynamic range of typical medical analog front-ends with adequate headroom. The MICROWIRE interface shares GPIOs with the host microcontroller's SPI bus, which is important for compact, low-BOM medical designs. Designers should note the electronics enable the electronics to support the electronics - verify IEC 60601 isolation requirements for the final system.
Recomendado
Programmable Logic Controller (PLC) Analog Input
The ADC12H038CIWM/NOPB is a strong fit for compact PLC analog input modules because its 8 single-ended / 4 differential inputs cover the typical 4-8 channel PLC AI card without external MUX ICs. The integrated sample-and-hold eliminates the need for external front-end T/H amplifiers, simplifying the BOM and improving noise immunity in electrically noisy industrial cabinets. Self-calibration corrects long-term drift caused by capacitor aging, which matters for PLCs deployed in field installations where recalibration is impractical. The 5 V single-supply operation aligns with PLC backplane 5 V rails, and the MICROWIRE-compatible serial interface shares buses with other PLC peripherals like digital I/O expanders and communication transceivers.
Recomendado
HVAC and Building Automation
The ADC12H038CIWM/NOPB works in HVAC and building automation controllers where multiple analog inputs (zone temperature, duct pressure, humidity, CO2 sensor voltage) feed a central MCU. Eight channels cover typical HVAC control boards with room for diagnostics. The self-calibration ensures accuracy over the 0-70 °C commercial temperature range without factory trimpot tuning, lowering manufacturing cost. The 28-SOIC footprint fits the compact DIN-rail enclosure form factor typical of building automation modules. The MICROWIRE interface shares pins with common HVAC MCU peripherals, reducing PCB area and BOM cost compared to parallel-output 12-bit ADCs.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADC12H038CIWM/NOPB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADC12H038CIWMX/NOPB | ADC12L038CIWM/NOPB | ADC12038CIWM/NOPB | ADC12038CIWMX/NOPB | ADC12138CIWM/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Resolution | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign |
| Sample Rate (max) | 182 ksps | 182 ksps | ~140 ksps (lower-power) | 182 ksps | 182 ksps | ~500 ksps |
| On-Demand Self-Calibration | Yes | Yes | Yes | No (power-up only) | No (power-up only) | Yes |
| Supply Voltage | 5 V | 5 V | 3.3 V or 5 V | 5 V | 5 V | 5 V |
| Input Channels | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF | 8 SE / 4 DIFF |
| 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 | -40 °C to +85 °C |
| Approximate Unit Price (qty 100) | $8.85 | $8.85 | $7.20 | $7.50 | $7.50 | $9.40 |
Diferenciadores clave
- On-demand self-calibration vs power-up-only calibration (frente a ADC12038CIWM/NOPB)
- 8 single-ended / 4 differential inputs with integrated MUX (frente a ADC0848BCN)
- 182 ksps sampling rate at 5 V (frente a ADC12L038CIWM/NOPB)
Notas de diseño
Decouple VCC and VREF separately with 0.1 µF ceramic capacitors placed as close to the ADC pins as possible; add a 10 µF bulk tantalum or ceramic capacitor on VCC. The reference input VREF is the conversion critical reference for the SAR architecture - any noise or drift on VREF directly translates to conversion error. Use a low-noise reference (e.g., REF102B or ADR01) if measurement accuracy beyond the ADC's intrinsic noise is required. Estimated based on standard SAR-ADC reference design guidance, not a datasheet figure.
Use a star-ground or split-plane layout to keep digital return currents (SCLK, DOUT, CS) physically separated from analog ground returns (AGND, VREF). Tie AGND and DGND together at a single point under or near the ADC, not at the power supply. Place the ADC's analog input traces symmetrically with the sample/hold timing in mind - asymmetric routing can introduce channel-to-channel crosstalk. Estimated based on standard mixed-signal PCB layout practice.
Source impedance on analog inputs must be low enough to settle the input within the SAR acquisition window. With a 182 ksps sample rate, the acquisition window is approximately 1.5 µs; for 12-bit accuracy the input must settle to within 0.5 LSB (about 244 µmV at 5 V VREF) in this time. Add an external input buffer op-amp (e.g., OPA227 or LMP7701) if the sensor source impedance exceeds 1 kΩ. The MICROWIRE clock and data lines should be routed away from analog traces and guarded by ground to reduce digital-to-analog crosstalk. Estimated based on SAR-ADC settling-time theory.
Do not hot-plug the analog input channels; the ADC12H038's input ESD protection is rated only for handling during manufacturing. Add external TVS diodes on analog input channels that may see transients in the field. Always trigger self-calibration after a power-up event - the part does not auto-calibrate after a brown-out or watchdog reset unless commanded. Avoid operating near the maximum sampling rate with high source impedance, as the input may not fully acquire and conversion accuracy degrades. Estimated based on field-design best practices.
Información de cumplimiento
RoHS compliant per TI product page. Industrial temperature grade -40 °C to +85 °C. Not AEC-Q100 qualified; for automotive applications verify with the TI automotive-grade product family.
