ADC124S101CIMMX - 4-Ch 12-Bit 500ksps-1Msps SAR ADC | TI
MPN: ADC124S101CIMMX ✓ Hoạt độngADC124S101CIMMX Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ADC124S101CIMMX — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADC124S101CIMMX (cùng hình factor và footprint) — khác nhau ở Architecture, Number of Channels, Operating Temperature, Package, RoHS Status.
ADC124S101CIMM/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC124S101CIMMX/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC124S051CIMMX
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC124S021CIMMX
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC122S101CIMM
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1247BEPE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC124S101CIMMX Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Điện áp tham chiếu | VDD (supply-referenced) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Maximum SCLK Frequency | 20 MHz (for 1 Msps at VDD >= 4.5V) |
| Phạm vi điện áp đầu vào | 0 V to VDD |
| Nhiệt độ hoạt động | -40C to +85C |
| Hộp | 10-pin VSSOP (DGZ) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (per /NOPB suffix family) |
Cấu hình chân ADC124S101CIMMX
| Chân 1 | CH0 — Analog input channel 0 |
| Chân 2 | CH1 — Analog input channel 1 |
| Chân 3 | CH2 — Analog input channel 2 |
| Chân 4 | CH3 — Analog input channel 3 |
| Chân 5 | GND — Ground (analog and digital common) |
| Chân 6 | VDD — Power supply (also used as reference) |
| Chân 7 | DOUT — Serial data output |
| Chân 8 | DIN — Serial data input (MOSI) |
| Chân 9 | SCLK — Serial clock input |
| Chân 10 | CS — Active-low chip-select bar |
Ứng dụng tiêu biểu
ADC124S101CIMMX phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADC124S101CIMMX — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Highest sample rate in the S0x1 4-channel SAR family (vsADC124S051CIMMX)
- 12-bit resolution in the smallest pin-compatible SAR family (vsADC122S101CIMM)
- True cross-brand drop-in option with internal or external reference (vsMAX1247BEPE+)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
