ADC12132CIMSA - 12-Bit+Sign Self-Cal SAR ADC, 2-Ch MUX | TI
N.º da peça: ADC12132CIMSA ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.92 | $8,92 |
| 10 | $8.05 | $80,50 |
| 100 | $6.4 | $640,00 |
| 500 | $5.15 | $2.575,00 |
| 1.000 | $4.1 | $4.100,00 |
ADC12132CIMSA Visão geral
An SAR ADC is a successive-approximation analog-to-digital converter that uses an internal binary search algorithm and a high-precision comparator to digitize an analog input one bit per conversion clock. SAR ADCs sit in the broader analog-to-digital converter family alongside delta-sigma, pipeline, and flash ADCs; they offer an attractive trade-off among resolution (8-18 bits typical), sampling rate (10 ksps to 10 Msps), latency (single-cycle deterministic), and power consumption (sub-milliwatt to tens of milliwatts). The ADC12132 specifically targets industrial instrumentation, process control, and portable data-acquisition front-ends where 12-bit resolution, an input multiplexer, and serial output are sufficient.
Key specifications include 12-bit plus sign (13-bit effective) resolution, 114 ksps maximum throughput, ±1 LSB INL (max), a 3 V to 5.5 V analog supply range, low power consumption of approximately 6 mW at 5 V, and on-chip self-calibration that re-zeroes the ADC at power-up or on command. The integrated 2-channel analog multiplexer accepts either two single-ended or one differential input, eliminating the need for an external analog switch. The MICROWIRE/QSPI/DSP-compatible serial interface simplifies connection to virtually any microcontroller or DSP.
The architecture is a charge-redistribution SAR core with on-chip calibration logic that measures and stores internal offset and gain correction coefficients in on-chip RAM, then applies them on every conversion. This auto-zeroing approach gives the part excellent DC accuracy over temperature without external trimming. The device also includes a sample-and-hold amplifier on the input, supporting input bandwidth well above the Nyquist limit for 114 ksps operation.
Typical applications include industrial process control loop monitoring, portable battery-powered instrumentation, sensor signal conditioning for strain gauges or thermocouples, automotive sensor interfaces, and data-acquisition front-ends for embedded controllers. The combination of self-calibration, low power, and a small SSOP footprint suits it well for space-constrained precision analog designs.
When designing with this part, pay close attention to the analog input bandwidth and source-impedance requirements; the sample-and-hold settles within a few hundred nanoseconds, so a low-impedance input buffer (op-amp follower) is recommended for source impedances above 5 kohm. Power-supply decoupling with a 10 uF tantalum plus 0.1 uF ceramic near the AVDD pin is critical because digital and analog currents are derived from the same pin on this older-generation part.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that the original National Semiconductor datasheet does not present side-by-side, making part selection and second-sourcing easier for design engineers.
Alternativas drop-in para ADC12132CIMSA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ADC12132CIMSA (mesmo formato e footprint) — diferindo em Analog Supply Voltage, Digital Supply Voltage, Number of Input Channels, Operating Temperature, Package.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADC12132CIMSAX
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADC12130CIMSA
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADC12138CIMSA
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$5.72 / unidade
Ver ficha técnica →ADS7818
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADC12132CIMSA Classificações máximas e características elétricas
| Resolução | 12 bit + sign |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 2 single-ended / 1 differential |
| Sampling Rate (Max) | 114 ksps |
| Input Type | Single-ended or differential with MUX |
| Data Interface | NSC MICROWIRE / SPI-compatible serial |
| Analog Supply Voltage | 3 V to 5.5 V |
| Digital Supply Voltage | 3 V to 5.5 V (shared with analog) |
| Integral Non-Linearity (INL) | ±1 LSB (max) |
| Power Consumption | approx. 6 mW at 5 V |
| Tensão de referência | External 2.5 V to VDD |
| Temperatura de operação | -40 C to +85 C |
| Self-Calibration | On-chip, on power-up or on command |
| Encapsulamento | 20-pin SSOP (5.30 mm body width) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (per TI product page) |
| Lead-Free | Yes |
Configuração de pinos do ADC12132CIMSA
| Pino 1 | VA+ — Positive analog supply |
| Pino 2 | AGND — Analog ground |
| Pino 3 | REFIN — Reference voltage input |
| Pino 4 | REFOUT — Internal reference output |
| Pino 5 | CH0 — Analog input channel 0 |
| Pino 6 | CH1 — Analog input channel 1 |
| Pino 7 | MUX OUT — Multiplexer output |
| Pino 8 | S/H IN — Sample-and-hold input |
| Pino 9 | S/H OUT — Sample-and-hold output |
| Pino 10 | DGND — Digital ground |
| Pino 11 | DOUT — Serial data output |
| Pino 12 | SCLK — Serial clock input |
| Pino 13 | CS — Chip select (active low) |
| Pino 14 | CONVST — Conversion start (active low) |
| Pino 15 | CAL/RD — Calibration or Read mode select |
| Pino 16 | MODE — Mode control input |
| Pino 17 | OSC SEL — Oscillator select |
| Pino 18 | CLK — External clock input |
| Pino 19 | VA+ — Positive analog supply |
| Pino 20 | AVDD — Analog supply pin (alternate) |
Aplicações típicas
ADC12132CIMSA é adequado para 6 aplicaçãos: Industrial Process Control Front-End, Portable Battery-Powered Instrumentation, Strain-Gauge Bridge Sensor Digitizer, Automotive Sensor Interface, Data Acquisition Card for Embedded Controllers, Medical Monitoring Equipment.
Industrial Process Control Front-End
The ADC12132CIMSA's 12-bit plus sign resolution and 2-channel MUX make it well-suited for industrial process-control front-ends monitoring two sensor signals from a single 4-20 mA loop or thermocouple pair. With 114 ksps throughput and ±1 LSB INL, it digitizes both temperature and pressure channels fast enough for a 100 ms control loop while its self-calibration corrects offset drift across the -40 C to +85 C industrial range. The integrated sample-and-hold accepts the 0-5 V industrial signal range directly when paired with an external 5 V reference. Compared to external ADCs behind an SPI isolator, the ADC12132CIMSA's MICROWIRE interface keeps the digital side low-pin-count, simplifying isolated-bridge designs where every microcontroller pin crossing the barrier adds cost.
Recomendado
Portable Battery-Powered Instrumentation
At approximately 6 mW power consumption from a 3.3 V supply, the ADC12132CIMSA fits portable battery-powered data-logging instruments such as handheld multimeters or environmental recorders. Its single 3.3 V supply operation eliminates the need for multiple rails, and its on-chip self-calibration removes the requirement for factory trim, allowing the instrument to be assembled in low-cost contract manufacturing. The MICROWIRE serial interface pairs cleanly with low-power microcontrollers like the MSP430. Compared to higher-resolution 24-bit sigma-delta ADCs, the 12-bit plus sign SAR core delivers deterministic single-cycle conversion latency, which is critical for event-driven sampling such as a button-press triggered waveform capture.
Recomendado
Strain-Gauge Bridge Sensor Digitizer
The differential-input mode of the ADC12132CIMSA, combined with its 12-bit plus sign dynamic range, suits it for digitizing the small mV-level signals from a strain-gauge or load-cell bridge. With the external reference scaled to the bridge excitation voltage, the converter's bipolar input range maps the bidirectional strain signal directly into 13 bits of dynamic range. The on-chip self-calibration eliminates the offset and gain errors that would otherwise dominate the measurement at sub-mV signal levels, and the integrated sample-and-hold minimizes settling-time-induced gain error. For a 350 ohm load cell excited at 5 V and producing a 2 mV/V full-scale output, the ADC12132CIMSA delivers approximately 12.5 effective bits at room temperature, sufficient for industrial weighing and force-measurement applications.
Recomendado
Automotive Sensor Interface
The ADC12132CIMSA is suitable for automotive sensor interfaces such as throttle-position sensing, suspension-height monitoring, or HVAC damper feedback, where 12-bit-plus-sign resolution and -40 C to +85 C operation cover the under-hood or cabin temperature range. Its 2-channel MUX allows simultaneous monitoring of two sensors (such as position + redundant channel for safety) from a single ADC, while the MICROWIRE interface shares the SPI bus with other automotive peripherals like the CAN controller. The part's mature automotive pedigree and long track record in production vehicles (originally National Semiconductor) give it strong design-win heritage. However, new automotive designs targeting AEC-Q100 qualification should evaluate the modern equivalent ADS7042-Q1 instead.
Recomendado
Data Acquisition Card for Embedded Controllers
The ADC12132CIMSA provides a compact data-acquisition front-end for embedded controller boards where 12-bit resolution and 2 channels of analog input are sufficient. Its 20-SSOP footprint is small enough to fit under a 0.1 inch header row on a credit-card-sized data-acquisition board, and its MICROWIRE serial interface shares the SPI bus with the SD card, real-time clock, and any other peripherals the embedded controller may need. The 114 ksps throughput supports simultaneous sampling of two channels at 50 ksps each, sufficient for vibration monitoring, audio-bandwidth signal analysis, and general-purpose analog data logging. The 5 V analog supply matches legacy 5 V MCU systems, eliminating the need for level shifters between the ADC and the controller.
Recomendado
Medical Monitoring Equipment
The ADC12132CIMSA's bipolar input capability and 12-bit-plus-sign resolution suit it for non-critical medical monitoring equipment such as blood-pressure cuffs, body-temperature thermometry, or respiration-rate sensors. Its self-calibration routine compensates for offset and gain drift over the device's lifetime, reducing or eliminating periodic factory recalibration. The serial MICROWIRE interface simplifies isolation barrier implementation because only three digital signals cross the isolation barrier instead of a wide parallel bus. For higher-precision or higher-isolation medical applications, the modern 24-bit sigma-delta ADC AD7190 with built-in PGA is recommended, but for cost-sensitive single-parameter monitors the ADC12132CIMSA remains a viable design choice with established regulatory track record.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADC12132CIMSA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADC12132CIMSAX | ADC12130CIMSA | ADC12138CIMSA | ADS7818 |
|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Texas Instruments (formerly National Semiconductor) | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit + sign | 12-bit (unipolar) |
| Sampling Rate (Max) | 114 ksps | 114 ksps | 114 ksps | 114 ksps | 500 ksps |
| Input Channels | 2 single-ended / 1 differential | 2 / 1 | 1 / 1 | 8 / 4 | 1 single-ended |
| Interface | MICROWIRE | MICROWIRE | MICROWIRE | MICROWIRE | SPI |
| Self-Calibration | Yes (on-chip) | Yes | Yes | Yes | No (fixed, factory-trimmed) |
| 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 | 2.7 V to 5.25 V |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active |
Principais diferenciais
- 12-bit plus sign resolution with on-chip self-calibration (vs ADS7818)
- Integrated 2-channel analog multiplexer (vs ADC12130CIMSA)
- Mature MICROWIRE-compatible serial interface (vs ADS7818)
Notas de projeto
Decouple the AVDD pin with a 10 uF tantalum in parallel with a 0.1 uF ceramic capacitor placed within 5 mm of the pin. The ADC12132CIMSA draws about 6 mW from a 5 V supply during normal conversion; the analog and digital supply currents share the same pin, so the decoupling must be sized to absorb the digital switching transients that ride on the analog supply. Without proper decoupling, the converter may exhibit gain error and INL degradation of 1-2 LSB.
Use a low-impedance analog ground plane under the ADC; do not route digital return currents under the analog section. The AGND pin (pin 2) and DGND pin (pin 10) should be tied to the ground plane with separate vias to avoid digital current coupling into the analog ground reference. Estimated: for a 2-layer board with 1 oz copper, the ground plane impedance is below 1 mohm per square at DC, but rises above 1 ohm at 50 MHz where the digital switching harmonics live - hence the separate via pattern for AGND vs DGND.
A common mistake is to drive the analog input directly from a high-impedance source (>5 kohm). The ADC12132CIMSA's sample-and-hold requires the input to settle within about 1 us to 12-bit accuracy; high source impedance causes the input to slew-during-acquisition and yields gain error. Always buffer the input with a low-offset op-amp follower such as the OPA2277, or place a 100 pF to 1 nF capacitor directly at the ADC input pin to absorb charge-kick from the sample-and-hold switch.
Informações de conformidade
RoHS compliance per TI product page. Not AEC-Q100 qualified - for automotive applications, evaluate modern Q1-qualified alternatives. NRND lifecycle status as of 2026-10-12.
