ADC124S101CIMMX - 4-Ch 12-Bit 500ksps-1Msps SAR ADC | TI
N.º de pieza: ADC124S101CIMMX ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.1 | $31,00 |
| 100 | $2.65 | $265,00 |
| 500 | $2.2 | $1.100,00 |
| 1.000 | $1.85 | $1.850,00 |
| 3.500 | $1.55 | $5.425,00 |
ADC124S101CIMMX Descripción general
A SAR ADC is a successive-approximation analog-to-digital converter that uses a binary-search loop, comparing the input against a capacitive DAC bit by bit, to produce a digital code in N clock cycles for N bits of resolution. SAR ADCs occupy a well-defined tier in the data-converter hierarchy: ADC -> SAR ADC -> successive-approximation converter -> data converter -> data acquisition IC -> signal chain -> mixed-signal semiconductor. They are valued for deterministic latency, no pipeline delay, low power consumption, and excellent DC accuracy, which makes them the workhorse of multiplexed low-to-medium-speed precision measurement.
Key features of the ADC124S101CIMMX include four single-ended analog input channels routed through an internal 4:1 multiplexer, an external SCLK up to 20 MHz giving up to 1 Msps throughput, true-differential inputs with the supply acting as the reference, a separate AGND/DGND split with a dedicated REF pin internally tied to VDD, and an operating temperature range of -40C to +85C. The 10-pin VSSOP footprint is the same as the legacy MSOP-10, suitable for space-constrained instrumentation.
Architecturally, the converter is built on a CMOS process with a charge-redistribution CDAC, a comparator, and an SAR control state machine. Because the supply voltage is also used as the reference, the datasheet explicitly notes that any noise on VDD will degrade noise performance; therefore a clean, well-bypassed supply is mandatory.
Typical applications include portable instrumentation and battery-powered data loggers, multi-zone temperature monitoring with thermistors/RTDs, factory automation sensor front ends, motor-current/voltage monitoring, optical encoders, and low-cost multiplexed analog front ends for microcontrollers without integrated ADC channels. The wide 2.7 V to 5.25 V supply range also supports 3.3 V and 5 V MCU ecosystems directly.
When designing with this device, place the 1 nF and 10 uF bypass capacitors as close to the VDD pin as possible and keep the analog inputs short and symmetrically placed to minimize crosstalk between MUX channels. Channel-to-channel crosstalk, ENOB at full rate, and INL/DNL figures must be evaluated against the system dynamic range budget.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in a single source on the manufacturer datasheet.
Alternativas directas para ADC124S101CIMMX — 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 ADC124S101CIMMX (mismo factor de forma y huella) — difiere en Architecture, Number of Channels, Operating Temperature, Package, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ADC124S101CIMM/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC124S101CIMMX/NOPB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC124S051CIMMX
✅ Sustitución directa✓ En stock
$1.99 / unidad
Ver hoja de datos →ADC124S021CIMMX
✅ Sustitución directa✓ En stock
$2.07 / unidad
Ver hoja de datos →ADC122S101CIMM
✅ Sustitución directa✓ En stock
$1.96 / unidad
Ver hoja de datos →MAX1247BEPE+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADC124S101CIMMX Valores máximos y características eléctricas
| Resolución | 12 bits |
| Number of Channels | 4 |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate Range | 500 ksps to 1 Msps |
| Input Type | Single-ended (4:1 mux) |
| Supply Voltage (VDD) | 2.7 V to 5.25 V |
| Power Dissipation (typ, 3V, 1 Msps) | 2.2 mW (per datasheet typical) |
| Tensión de referencia | VDD (supply-referenced) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Maximum SCLK Frequency | 20 MHz (for 1 Msps at VDD >= 4.5V) |
| Rango de tensión de entrada | 0 V to VDD |
| Temperatura de funcionamiento | -40C to +85C |
| Encapsulado | 10-pin VSSOP (DGZ) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (per /NOPB suffix family) |
Configuración de pines de ADC124S101CIMMX
| 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 | GND — Ground (analog and digital common) |
| Pin 6 | VDD — Power supply (also used as reference) |
| Pin 7 | DOUT — Serial data output |
| Pin 8 | DIN — Serial data input (MOSI) |
| Pin 9 | SCLK — Serial clock input |
| Pin 10 | CS — Active-low chip-select bar |
Aplicaciones típicas
ADC124S101CIMMX es adecuado para 6 aplicacións: Portable Battery-Powered Data Loggers, Multi-Zone Temperature Monitoring (Thermistor / RTD), Industrial Sensor Front End (PLC / 4-20 mA Loop Monitor), Motor Current / Voltage Monitoring, Optical Encoder / Position Sensing, Low-Cost Multiplexed Analog Front End for MCUs without ADC.
Portable Battery-Powered Data Loggers
The ADC124S101CIMMX fits portable battery-powered data loggers because its 2.7 V to 5.25 V single-supply range accepts a direct Li-ion / 2xAA / 3.3 V LDO rail and its ~2.2 mW dissipation at 3 V and 1 Msps preserves battery life. The 4 single-ended channels multiplex thermistor, battery voltage, current-sense, and ambient-light sensor inputs to one SPI port of a low-power MCU. Place a 10 uF + 100 nF bypass close to VDD; a ferrite bead between the digital rail and ADC124S101CIMMX keeps digital ground noise out of the conversions. Trade-off: VDD-as-reference means any LDO ripple directly degrades SNR, so a low-noise LDO is recommended.
Recomendado
Multi-Zone Temperature Monitoring (Thermistor / RTD)
The ADC124S101CIMMX is ideal for multi-zone temperature monitoring because its 4 single-ended channels can scan up to four NTC thermistors or 2-wire RTDs in sequence through one SPI port of a microcontroller, with deterministic SAR latency and no pipeline delay. Its 12-bit resolution provides ~1 C accuracy at the 0 to +70 C range when paired with 10 kohm NTCs and a 1 mA excitation source. Place the excitation source and bias network symmetrically to minimize channel-to-channel variation. Compared to switch-mode such as integrating ADCs, the SAR converter settles per conversion with no cycle-to-cycle history, simplifying the firmware scan loop.
Recomendado
Industrial Sensor Front End (PLC / 4-20 mA Loop Monitor)
The ADC124S101CIMMX fits industrial 4-20 mA loop monitoring because the 2.7 V to 5.25 V supply and four single-ended inputs can read up to four current-sense shunt voltages (typically 250 ohm at 4-20 mA = 1 to 5 V) directly. The 1 Msps throughput supports high-speed control loops, while the -40 C to +85 C industrial temperature range and SPI interface suit PLC backplanes. Add a TVS / surge protector at the loop side and a small RC filter at the ADC input; verify the digital isolator ground split. Compared to a 24-bit sigma-delta, the SAR converter gives lower latency and deterministic settling per sample.
Recomendado
Motor Current / Voltage Monitoring
The ADC124S101CIMMX is well suited to motor current/voltage monitoring because the four single-ended inputs simultaneously digitize phase-A current, phase-B current, DC-bus voltage, and a temperature channel at 500 ksps to 1 Msps, with SAR deterministic latency that aligns with the PWM switching frequency. Its 2.7 V to 5.25 V supply accepts 3.3 V or 5 V MCU rails, and its small 10-pin VSSOP footprint saves space on the inverter control PCB. Trade-off: for very high common-mode voltages (>VDD), add a current-sense amplifier or isolation amplifier in front of the ADC124S101CIMMX to keep the input within 0 V to VDD.
Recomendado
Optical Encoder / Position Sensing
The ADC124S101CIMMX fits optical encoders and position sensors because its 4 single-ended channels can read the quadrature sine/cosine signals from an optical encoder IC plus an index channel and an analog temperature compensation input. The 1 Msps throughput supports >100 kRPM encoders when oversampled with the SINC averaging filter in firmware. The 10-pin VSSOP footprint keeps the analog section compact on the sensor head PCB. Compared to switch-mode such as sigma-delta converters, the SAR delivers deterministic per-sample latency, which simplifies phase-error correction.
Recomendado
Low-Cost Multiplexed Analog Front End for MCUs without ADC
The ADC124S101CIMMX adds 4 channels of 12-bit 500 ksps-1 Msps SAR ADC to microcontrollers that lack an integrated ADC (e.g. low-cost Cortex-M0 parts) or where the integrated ADC channels are exhausted. The SPI interface shares the MCU bus, and the small VSSOP footprint mounts on a piggyback board. Per the TI datasheet, the supply doubles as the reference, so power it from a clean 3.3 V LDO rather than the noisy digital 5 V rail. Trade-off: no internal PGA, so input signals must be scaled to 0 V to VDD externally.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADC124S101CIMMX — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADC124S101CIMM/NOPB | ADC124S101CIMMX/NOPB | ADC124S051CIMMX | ADC124S021CIMMX | MAX1247BEPE+ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 10-pin VSSOP (DGZ) | 10-pin VSSOP (DGZ) | 10-pin VSSOP (DGZ) | 10-pin VSSOP (DGZ) | 10-pin VSSOP (DGZ) | 10-pin VSSOP (DGZ-compatible) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Sample Rate Range | 500 ksps to 1 Msps | 500 ksps to 1 Msps | 500 ksps to 1 Msps | 200 ksps to 500 ksps | 50 ksps to 200 ksps | up to 225 ksps |
| Supply Voltage | 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 | 2.7 V to 5.25 V |
| Digital Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| Reference | VDD (supply-referenced) | VDD | VDD | VDD | VDD | Internal or external |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- Highest sample rate in the S0x1 4-channel SAR family (frente a ADC124S051CIMMX)
- 12-bit resolution in the smallest pin-compatible SAR family (frente a ADC122S101CIMM)
- True cross-brand drop-in option with internal or external reference (frente a MAX1247BEPE+)
Notas de diseño
Because the ADC124S101CIMMX uses VDD as the reference, the supply must be clean and well-bypassed. Place a 10 uF ceramic (X5R/X7R) plus a 100 nF ceramic within 3 mm of pin 6 (VDD), and add a ferrite bead between the ADC supply and any noisy digital rail. A low-LDR2 is recommended to keep switching noise out of conversions. Estimated: with a 3.3 V supply at 1 Msps the part draws about 2.2 mW; a switching DC-DC converter without filtering will inject >50 mV ripple that directly reduces SNR.
Layout the analog input traces symmetrically, keep them short, and route them away from the SCLK and DOUT traces to minimize crosstalk. Use a single ground pour with star routing from pin 5 to the MCU ground; avoid splitting the ground plane beneath the ADC. Add a guard trace around the analog inputs tied to GND to reduce coupling from adjacent signals. Keep the bypass capacitors (100 nF + 10 uF) within 3 mm of pin 6.
SCLK edges should have monotonic rise/fall times <10 ns to avoid double-clocking the conversion; place a small series resistor (33 ohm) at the SCLK source if the trace is long. CS-bar must return high between conversions to reset the serial interface; toggling CS-bar mid-conversion produces corrupt data. When daisy-chaining multiple ADC124S101CIMMX devices on one SPI bus, verify timing against the figure in the datasheet (tCSS, tCSH).
Do not leave any analog input floating during a conversion: floating inputs pick up noise and corrupt the channel reading. Always terminate unused channels to GND through a 1 kohm resistor. Do not exceed the absolute maximum analog input rating (VDD + 0.3 V); the inputs are NOT over-voltage protected. Do not power the ADC124S101CIMMX from a switching regulator output unless filtered, because any noise on VDD directly modulates the conversion result.
Información de cumplimiento
Lead-free /NOPB ordering code is the preferred choice for new designs requiring RoHS compliance. AEC-Q100 standard for automotive not applicable; no AEC-Q100 grade is available in this family.
