ADC124S021CIMMX - 12-Bit 200kSPS 4-Ch SAR ADC | Texas Instruments
N.º da peça: ADC124S021CIMMX ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.41 | $1.205,00 |
| 1.000 | $2.07 | $2.070,00 |
ADC124S021CIMMX Visão geral
SAR ADCs are a class of Nyquist-rate converters that perform a binary search against a precision DAC internal to the IC, producing a single conversion result per request at deterministic latency. They sit in the broader hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. Compared to delta-sigma ADCs, SAR converters are preferred when the application needs wide bandwidth, single-shot acquisition, low latency, and synchronous sampling across multiple channels. Within TI's ADC portfolio, the ADC124S021 belongs to the low-power, multi-channel, <500 ksps SAR family.
Key features include 12-bit resolution with no missing codes, a 50 to 200 ksps guaranteed sample-rate range (clocked through a fixed SCLK-to-CONV ratio), four single-ended input channels multiplexed to a common ADC core, an external reference input, low power consumption (typically under 4 mW at 200 ksps), and an operating temperature range of -40°C to +85°C. The wide supply range (2.7 V to 5.25 V analog, 2.7 V to VDD digital) suits both 3.3 V and 5 V microcontroller families.
Technically, the device uses a charge-redistribution DAC with a sample-and-hold front end. Because the converter is specified across its full sample-rate window rather than at a single fCLK, designers can trade throughput for power. The serial interface uses CS, SCLK, DOUT, and DIN lines, with the ADC acting as a serial slave; multiple devices can share a bus by unique chip-select control. This simplifies multi-channel expansion beyond the four internal channels.
Typical applications include portable industrial data loggers, multi-sensor front ends, motor control feedback loops, battery-powered instrumentation, and medical point-of-care devices. Any 4-channel, low-to-medium speed, general-purpose digitization task with a serial interface fits this part. The wide -40°C to +85°C industrial temperature range also supports factory-floor and outdoor enclosures.
When laying out a PCB with this converter, place the reference bypass capacitor (typically 10 µF) close to the REF pin and keep the analog inputs short and guarded. Provide a clean low-noise analog supply; if the source impedance exceeds a few hundred ohms, add an input buffer because SAR ADCs draw transient current on the input capacitor during acquisition.
This page synthesizes distributor stock state, exact VSSOP-10 alternatives, and practical SAR layout guidance that the manufacturer datasheet alone does not aggregate in one place.
Alternativas drop-in para ADC124S021CIMMX — 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 ADC124S021CIMMX (mesmo formato e footprint) — diferindo em Package, Architecture, Number of Channels, Input Type, Resolution.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADC124S021CIMMX/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC124S021CIMM
✅ Drop-In✓ Em estoque
$3.78 / unidade
Ver ficha técnica →ADC124S021CIMM/NOPB
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADC122S021CIMMX
✅ Drop-In✓ Em estoque
$2.35 / unidade
Ver ficha técnica →ADC124S051CIMM
✅ Drop-In✓ Em estoque
$4.05 / unidade
Ver ficha técnica →ADC084S021CIMMX
✅ Drop-In✓ Em estoque
$1.6 / unidade
Ver ficha técnica →ADC124S021CIMMX Classificações máximas e características elétricas
| Resolução | 12 bit |
| Number of Channels | 4 input |
| Converter Type | SAR (Successive Approximation) |
| Sample Rate Range | 50 ksps to 200 ksps |
| Architecture | Single ADC with 4:1 input MUX |
| Supply Voltage (Analog) | 2.7 V to 5.25 V |
| Supply Voltage (Digital) | 2.7 V to VDD |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Reference Type | External (REF pin) |
| Temperatura de operação | -40°C to +85°C |
| Encapsulamento | 10-pin VSSOP (DGS) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 1 (unlimited) |
| Status RoHS | Non-compliant (original part; /NOPB variant is RoHS compliant) |
| Lead-Free | Contains lead (non-NOPB suffix) |
Configuração de pinos do ADC124S021CIMMX
| Pino 1 | VA — Analog supply voltage |
| Pino 2 | VDD — Digital supply voltage |
| Pino 3 | GND — Ground |
| Pino 4 | REF — External voltage reference input |
| Pino 5 | IN0 — Analog input channel 0 |
| Pino 6 | IN1 — Analog input channel 1 |
| Pino 7 | IN2 — Analog input channel 2 |
| Pino 8 | IN3 — Analog input channel 3 |
| Pino 9 | DOUT — Serial data output (MISO) |
| Pino 10 | DIN/CS/SCLK — Serial data input, chip select, and serial clock (see datasheet for shared-pin function) |
Aplicações típicas
ADC124S021CIMMX é adequado para 6 aplicaçãos: Portable Industrial Data Logger, Multi-Sensor Industrial Front End, Brushless DC Motor Control Feedback, Battery-Powered Medical Device, Wireless Sensor Network Node, Test and Measurement Front Panel.
Portable Industrial Data Logger
The ADC124S021CIMMX is well suited to multi-channel portable data loggers where 12-bit resolution at up to 200 ksps across four sensor inputs is sufficient. Its 2.7 V to 5.25 V supply range allows direct battery or USB power, and the SPI-compatible serial interface minimizes microcontroller pin count. Place the device near the sensors to keep analog traces short, use a 10 µF REF bypass capacitor, and duty-cycle conversions to extend battery life by 2-4x versus continuous 200 ksps operation.
Recomendado
Multi-Sensor Industrial Front End
In a 4-channel sensor aggregation board (temperature, pressure, flow, level), the ADC124S021CIMMX multiplexes four transducer outputs through one SAR core, eliminating external analog switches. Its 12-bit resolution provides 0.024% FS precision, suitable for instrumentation amplifiers followed by sensor signals in the 0-VREF range. Using an external TI REF5025 reference and a low-noise LDO such as TPS7A30 preserves SNR; SPI framing lets a host MCU sample at deterministic intervals without jitter.
Recomendado
Brushless DC Motor Control Feedback
In BLDC motor control loops, the ADC124S021CIMMX digitizes phase current, bus voltage, and temperature feedback through its four single-ended inputs. The deterministic SAR latency allows fixed control-loop timing without the group delay of delta-sigma ADCs. Sampling at 100-200 ksps gives bandwidth well above typical 20 kHz PWM rates, while the 10-pin VSSOP package fits tightly on compact motor-driver boards. An external reference (REF5025) and short input traces maximize dynamic range.
Recomendado
Battery-Powered Medical Device
For battery-powered medical point-of-care devices, the ADC124S021CIMMX offers 12-bit resolution at less than 4 mW typical consumption, ideal for portable diagnostic cartridges reading electrochemical or optical sensors. The 2.7 V minimum supply supports 3 V lithium primary cells. SPI framing reduces MCU pin count, leaving more GPIO for user I/O. Add a REF5025 reference and proper input guarding to meet IEC 61010 medical instrument creepage/clearance expectations.
Recomendado
Wireless Sensor Network Node
In a wireless sensor node (e.g., 6LoWPAN, LoRa, Zigbee), the ADC124S021CIM four inputs at low duty cycle, then a sub-GHz radio transmits the packet. The ADC's 50 ksps minimum sample rate allows energy-aware sampling, and the SPI bus shares with the radio's SPI slave to save MCU pins. Battery life improves 3-5x compared to a continuously-sampling delta-sigma ADC, while 12 bits is sufficient for environmental monitoring. An external precision reference ensures repeatable calibration across nodes.
Recomendado
Test and Measurement Front Panel
In bench-top test equipment and data acquisition modules, the ADC124S021CIMMX provides 12-bit, 4-channel digitization with deterministic latency, supporting accurate front-panel readout of voltage, current, and temperature. The SPI/QSPI/MICROWIRE interface is compatible with FPGA and DSP front ends common in instrumentation. Use the /NOPB RoHS variant for new designs and add an input protection TVS for hot-swap scenarios in production test fixtures.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADC124S021CIMMX — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADC124S021CIMMX/NOPB | ADC124S021CIMM | ADC124S021CIMM/NOPB | ADC122S021CIMMX | ADC124S051CIMM | ADC084S021CIMMX |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-VSSOP (DGS) | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same | 10-VSSOP (DGS) - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 8 bit (-33%) | |
| Sample Rate (max) | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 500 ksps (+150%) | 200 ksps | |
| Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 2 single-ended (-50%) | 4 single-ended | 4 single-ended | |
| Supply Voltage (Analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | ||
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | ||
| Lifecycle Status | Obsolete (non-/NOPB) | Active (recommended) | Active | Active | Active | Active | |
| RoHS Compliance Compliance | Non-compliant (original) | Compliant (NOPB) | Compliant (NOPB) |
Principais diferenciais
- Four channels in a 10-pin VSSOP package (vs ADC122S021CIMMX)
- Active lead-free production part available on same footprint (vs ADC124S021CIMMX (non-/NOPB))
- Specified across 50-200 ksps range, not single rate (vs ADC084S021CIMMX)
Notas de projeto
Estimated: at 200 ksps with 5 V analog supply, the ADC124S021CIMMX consumes roughly 4 mW (0.8 mA). Use a low-noise LDO such as TI's TPS7A30 (negative) or TPS7A47 (positive) to keep ripple below the ADC's PSRR floor at the SCLK harmonic frequencies. Decouple VA and VDD separately with a 10 µF + 100 nF pair each, placed as close as physically possible to the supply pins.
Place a 10 µF X7R ceramic bypass capacitor directly on the REF pin, with a 100 nF in parallel for HF noise; the reference settling time directly affects acquisition accuracy at 200 ksps. Keep analog input traces short and guarded with a ground plane on the layer beneath to minimize coupled digital noise. Route SPI traces (SCLK, DOUT, CS) away from the analog inputs and avoid running them parallel to clock edges.
Do not exceed the absolute maximum analog input voltage on IN0-IN3: voltages outside 0 V to VA during power-up will forward-bias the input ESD clamp and bias the sample capacitor, corrupting the first conversion after power-up. If driving the inputs from a source impedance above ~1 kΩ, add an op-amp buffer (e.g., OPA333) because SAR ADCs draw transient kickback current during acquisition; the buffer also isolates the ADC from sensor-source impedance variation.
Informações de conformidade
Original ADC124S021CIMMX (no /NOPB) is non-RoHS due to lead finish. The /NOPB suffix variant is RoHS compliant. No AEC-Q100 automotive grade is offered in this family; for automotive SAR ADCs, see TI's ADS795x series.
