ADC12H032CIWM - 12-Bit+Sign SAR ADC, 8-Ch MUX, Serial I/O | TI
N.º de pieza: ADC12H032CIWM ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.75 | $1.375,00 |
| 500 | $11.9 | $5.950,00 |
| 1.000 | $10.45 | $10.450,00 |
ADC12H032CIWM Descripción general
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous analog voltage on its input into a discrete digital code representing that voltage. A successive-approximation register (SAR) ADC uses a binary-search algorithm against an internal DAC, trading conversion speed for high resolution at low power. ADCs sit at the analog boundary of data-acquisition systems (DAQs), which themselves belong to the broader mixed-signal / power-management signal-chain hierarchy. The 12-bit plus sign format (sometimes called 12-bit + sign or sign-extended 12-bit) gives an effective 13-bit two's-complement code covering -Vref to +Vref, ideal for bipolar sensor signals.
Key features of the ADC12H032CIWM include: differential nonlinearity (DNL) of +/-1 LSB max, integral nonlinearity (INL) of +/-1 LSB max, self-calibration that runs automatically on command, and an NSC MICROWIRE-compatible serial interface that simplifies connection to microcontrollers and DSPs. The 8-channel analog input MUX lets one ADC IC scan eight sensors, dramatically reducing system cost and PCB area in multi-channel instrumentation.
The architecture combines an input MUX, a track/hold amplifier, a successive-approximation ADC core with calibration registers, and a serial output state machine. On-chip calibration trims the internal capacitor mismatch and reference scaling, delivering specified accuracy without external trimpots. The wide-body SOIC-20 footprint provides generous lead spacing for hand-soldering and inspection while remaining suitable for automated SMT lines.
Typical applications include multi-channel data acquisition systems, industrial process control and sensor monitoring, battery-cell monitoring, portable instrumentation, and embedded closed-loop control. Designers select this part when they need multiple analog inputs read by a single MCU with minimal board space and software-controlled channel switching.
When designing with this ADC, place 0.1 uF bypass capacitors close to the supply pins, follow the datasheet's reference-capacitor network exactly (a 0.1 uF ceramic plus a 1 uF tantalum in parallel is common), and respect the serial-clock timing margins of the MICROWIRE interface. The self-calibration routine should be invoked once after power-up and after any significant temperature change.
This page synthesizes distributor pricing, drop-in alternatives from the same ADC12H030/032/034/038 family, and practical design notes that go beyond the manufacturer datasheet's specification tables.
Alternativas directas para ADC12H032CIWM — 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 ADC12H032CIWM (mismo factor de forma y huella) — difiere en Resolution, Sample/Hold, Analog Supply Voltage, Architecture, Digital Supply Voltage.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADC12H030CIWM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12H034CIWM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12H038CIWM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12138CIWM
✅ Sustitución directa✓ En stock
$5.8 / unidad
Ver hoja de datos →ADC12038CIWM
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC12H032CIWM Valores máximos y características eléctricas
| Resolución | 12 bit + sign (sign-extended 13-bit code) |
| Conversion Architecture | Successive Approximation Register (SAR) |
| Sample Rate | Up to 54 ksps (per family datasheet, exact sample rate per variant) |
| Number of Input Channels | 8 (analog input multiplexer) |
| Sample/Hold | Integrated track-and-hold |
| Calibration | Self-calibrating (offset + linearity auto-trim on command) |
| DNL (Differential Non-Linearity) | +/-1 LSB (max) |
| INL (Integral Non-Linearity) | +/-1 LSB (max) |
| Digital Interface | NSC MICROWIRE-compatible serial I/O |
| Encapsulado / Carcasa | 20-SOIC (0.295 in / 7.50 mm width, wide body) |
| Pin of Pins | 20 |
| Temperature Grade | Industrial |
| Terminal Form | Gull Wing |
| Tipo de montaje | Surface Mount |
| Packaging | Tube |
Configuración de pines de ADC12H032CIWM
| Pin 1 | VDD — Positive analog supply |
| Pin 2 | VREF+ — Positive reference input / reference bypass |
| Pin 3 | VREF- — Negative reference input (normally tied to analog ground) |
| Pin 4 | AGND — Analog ground |
| Pin 5 | IN0 — Analog input channel 0 |
| Pin 6 | IN1 — Analog input channel 1 |
| Pin 7 | IN2 — Analog input channel 2 |
| Pin 8 | IN3 — Analog input channel 3 |
| Pin 9 | IN4 — Analog input channel 4 |
| Pin 10 | IN5 — Analog input channel 5 |
| Pin 11 | IN6 — Analog input channel 6 |
| Pin 12 | IN7 — Analog input channel 7 |
| Pin 13 | DOUT — Serial data output (MICROWIRE) |
| Pin 14 | SCLK — Serial clock input |
| Pin 15 | CS — Chip select (active low) |
| Pin 16 | DGND — Digital ground |
| Pin 17 | CAL — Calibration control / serial command line |
| Pin 18 | SHTDN — Shutdown control (active low) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Aplicaciones típicas
ADC12H032CIWM es adecuado para 6 aplicacións: Multi-Channel Data Acquisition Systems, Industrial Process Control and Sensor Monitoring, Battery Cell Monitoring and Management, Portable Instrumentation, Embedded Closed-Loop Control, Legacy Equipment Repair and Field Replacement.
Multi-Channel Data Acquisition Systems
The ADC12H032CIWM is well suited to multi-channel data-acquisition (DAQ) front ends where one IC scans eight sensors sequentially. Its integrated 8-channel analog input MUX lets a single MCU command all eight channels through the MICROWIRE serial interface, eliminating per-channel external MUX ICs. The 12-bit + sign resolution and +/-1 LSB INL/DNL deliver accurate conversion of process signals such as 4-20 mA loop outputs scaled to ground-referenced voltages. Designers place a 0.1 uF ceramic bypass close to VDD, follow the datasheet's reference capacitor network, and invoke the self-calibration command once at power-up.
Recomendado
Industrial Process Control and Sensor Monitoring
In industrial process control, the ADC12H032CIWM's 8-channel MUX reads thermocouples, RTDs, pressure transducers, and 4-20 mA loop shunts from a single board location. The sign-extended 12-bit code natively covers bipolar thermocouple voltages, simplifying firmware math versus unipolar codes. The wide-body SOIC-20 footprint tolerates factory-floor thermal cycling and provides the lead robustness required for hand-rework on legacy equipment. Pair the ADC with a precision external reference and an instrumentation front-end amplifier for highest accuracy.
Recomendado
Battery Cell Monitoring and Management
The ADC12H032CIWM is suitable for battery management systems that monitor individual cell voltages in a multi-cell stack. Each input channel connects to a divided-down cell voltage, and the 8-channel MUX handles an 8-cell battery without an external multiplexer. The sign bit accommodates negative voltages relative to ground-referenced cell taps. Self-calibration keeps accuracy stable across the BMS operating temperature range. The wide-body SOIC package provides mechanical robustness for automotive and industrial battery pack assemblies.
Recomendado
Portable Instrumentation
Portable hand-held instruments benefit from the ADC12H032CIWM's combination of low channel count (8), compact SOIC-20 footprint, and MICROWIRE interface that mates to low-pin-count MCUs. The self-calibrating architecture eliminates factory trimpots, reducing calibration cost in volume production. The wide-body SOIC package is compatible with standard SMT lines, keeping assembly cost low. Designers leverage the MUX to scan keypad, battery, and sensor analog channels from a single ADC, simplifying board layout versus dedicated ADCs per signal.
Recomendado
Embedded Closed-Loop Control
In closed-loop control systems (motor drives, valve controllers, HVAC actuators), the ADC12H032CIWM provides fast feedback of analog control variables such as current, voltage, position, and temperature. The SAR architecture delivers deterministic conversion latency suitable for fixed-cycle control loops, and the MICROWIRE interface fits easily into MCU timer-driven sampling schedules. The 8-channel MUX lets a single ADC monitor feedback signals from multiple axes or zones. Pair the ADC with PWM outputs and an MCU running a PI/PID loop for complete digital control.
Recomendado
Legacy Equipment Repair and Field Replacement
The ADC12H032CIWM's NRND status makes it a primary part for repairing older industrial and scientific equipment that already uses this footprint. Service technicians and field-repair depots stock this part to maintain existing installations without redesigning PCBs. The wide-body SOIC-20 package is easy to hand-solder or rework, supporting field repairs. Same-family drop-in alternatives (ADC12H030CIWM, ADC12H034CIWM) allow technicians to substitute a still-active part if the original is unavailable, preserving long-term serviceability.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADC12H032CIWM — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADC12H030CIWM | ADC12H034CIWM | ADC12H038CIWM | ADC12138CIWM | ADC12038CIWM |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-SOIC (wide body) | 20-SOIC (wide body) - same | 20-SOIC (wide body) - same | 20-SOIC (wide body) - same | 20-SOIC (wide body) - same | 20-SOIC (wide body) - same |
| Resolution | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign | 12 bit + sign |
| Architecture | SAR with self-calibration | SAR with self-calibration | SAR with self-calibration | SAR with self-calibration | SAR with self-calibration | SAR (no self-calibration) |
| Input Channels | 8 | 4 | 8 | 8 | 8 | 8 |
| Serial Interface | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible | MICROWIRE-compatible |
Diferenciadores clave
- Integrated 8-channel analog input multiplexer (frente a ADC12H030CIWM)
- On-command self-calibration eliminates factory trimpots (frente a ADC12038CIWM)
- MICROWIRE-compatible serial interface (frente a Parallel-output ADCs of similar resolution)
Notas de diseño
Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin, with a short trace to the AGND pin. According to the family datasheet, the ADC12H032CIWM draws its analog and digital supply from VDD; a noisy supply directly degrades INL/DNL. Add a ferrite bead or RC filter on the supply trace if the VDD rail is shared with switching logic.
Follow the reference capacitor network shown in the datasheet exactly: typically a 0.1 uF ceramic in parallel with a 1 uF tantalum (or larger) on VREF+ to VREF-, located within 5 mm of the reference pins. The reference bypass network determines the ADC's noise floor; improper bypassing can degrade effective resolution by 1-2 bits.
Invoke the self-calibration command at power-up and after any significant temperature change. Skipping calibration leaves internal capacitor mismatch uncorrected, and INL/DNL may exceed the +/-1 LSB datasheet specification. Also respect the MICROWIRE timing margins - the SCLK high and low times must satisfy the minimum values listed in the AC Electrical Characteristics table; violating them produces erratic conversion results.
Keep analog input traces short and surrounded by a ground pour to minimize crosstalk between the 8 MUX channels. Route digital signals (SCLK, DOUT, CS) away from analog traces to prevent digital switching noise from coupling into the input MUX. Star-ground analog and digital grounds at the ADC's AGND/DGND pins to avoid ground-loop noise on the reference.
Información de cumplimiento
Compliance status not specified in the verified web data for this NRND part. Refer to the manufacturer datasheet ordering information for definitive RoHS/lead-free status before new board bring-up.
