ADC124S051CIMM - 4-Ch 12-Bit 500kSPS SAR ADC | Texas Instruments
MPN: ADC124S051CIMM ✗ Cuối đờiADC124S051CIMM Tóm tắt
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data converter that resolves a sampled analog input one bit per clock cycle against an internal DAC and comparator. In the broader taxonomy, the ADC124S051 belongs to the SAR ADC family, which sits within successive-approximation ADCs, data converters, signal-chain ICs, and finally the semiconductor category. SAR ADCs are prized for deterministic latency, low power, and excellent DC accuracy, which is why they dominate multiplexed low-channel-count instrumentation, sensor readouts, and embedded control applications.
Key features of this device include a true-differential input pair (CH1+/CH1-, CH2+/CH2-) configured as four pseudo-differential single-ended channels, an external reference input (VREF, 1V to VDD), a hardware-/software-shutdown pin (SHDN) that drops quiescent current to 0.06 µA, and pin-compatible scaling from 8-bit (ADC084S051) to 12-bit (ADC124S051). The part operates from -40°C to +85°C and ships in the miniature 10-pin VSSOP package that fits on a 3 mm × 3 mm land pattern.
Architecturally, the device combines an on-chip sample-and-hold amplifier, a charge-redistribution SAR core, an internal oscillator, and an SPI-compatible serial output. The factory-trimmed internal reference is not used here; an external 2.5 V reference is typical. Latency is one conversion clock period, which simplifies digital control loops that need deterministic sampling.
Typical applications include portable patient monitors, industrial multi-sensor modules, factory automation backplanes, battery-management telemetry, optical-module monitoring, and 4-20 mA loop digitizers. Pairing the ADC124S051 with an external 2.5 V reference such as the TI REF3025 and an op-amp driver such as the OPA2333 delivers 12-bit accurate readings across a -40°C to +85°C industrial envelope.
A practical design tip: route the VREF trace as a guard trace and place the 10 µF plus 0.1 µF decoupling combination within 5 mm of the VREF pin. Avoid switching the analog multiplexer into a >0.4 µF charged capacitive load directly to minimize kickback errors. If mid-scale accuracy at 500 kSPS matters more than full-rate throughput, dithering the input by one LSB reduces noise-folded errors.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond the manufacturer's datasheet and are not aggregated on competing distributor listings.
Bộ thay thế dễ dàng lắp đặt cho ADC124S051CIMM — 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 ADC124S051CIMM (cùng hình factor và footprint) — khác nhau ở Package, Architecture, Digital Interface, Input Type, Number of Channels.
ADC124S051CIMM/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC084S051CIMM
✅ 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 →ADS7841E
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MCP3204-CI/MS
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADC124S051CIMM Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Sample Rate | 200 kSPS to 500 kSPS |
| Number of Channels | 4 |
| Input Type | Single-Ended (4 pseudo-differential pairs) |
| Architecture | SAR (Successive Approximation) |
| Điện áp cung cấp | 2.7 V to 5.25 V (single supply) |
| Analog Supply Current at 200 kSPS | 1.55 mW total (typ) |
| Điện áp tắt | 0.06 µA (typ) |
| External Reference Voltage | 1 V to VDD (typ 2.5 V) |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C |
| Hộp | 10-pin VSSOP (DGS) 3 mm × 3 mm |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited) |
| Trạng thái RoHS | Compliant |
| Pin Compatibility | Pin-compatible with ADC084S051 (8-bit) and ADC124S021 (lower speed) |
Cấu hình chân ADC124S051CIMM
| Chân 1 | AIN1+ / AIN1 — Analog input channel 1 (positive or single-ended) |
| Chân 2 | AIN1- — Analog input channel 1 negative (pseudo-differential) |
| Chân 3 | AIN2+ / AIN2 — Analog input channel 2 (positive or single-ended) |
| Chân 4 | AIN2- — Analog input channel 2 negative (pseudo-differential) |
| Chân 5 | SHDN — Hardware shutdown (active low; tie to VA to enable) |
| Chân 6 | VA — Analog supply voltage (2.7 V to 5.25 V) |
| Chân 7 | GND — Ground |
| Chân 8 | VREF — External reference voltage input (1 V to VDD) |
| Chân 9 | DOUT — Serial data output (SPI MOSI; functions as DRDY# when CS# is held high) |
| Chân 10 | CS# — Active-low chip select for SPI interface |
Ứng dụng tiêu biểu
ADC124S051CIMM phù hợp cho 7 Áp dụngs: Portable Patient Monitoring (SpO2 / ECG Telemetry), Industrial Multi-Sensor Module (PLC / 4-20 mA Digitizer), Optical Module Monitoring (SFP / QSFP Transceivers), Battery Management Telemetry (BMS Cell Monitor), Factory Automation Backplane (Sensor Hub / Edge Node), Multi-Channel Data Acquisition Card (USB / PC-Based DAQ), IoT Sensor Node (Smart Building / HVAC).
Portable Patient Monitoring (SpO2 / ECG Telemetry)
The ADC124S051's 4-channel input is ideal for multi-lead patient-monitoring front ends where 4 sensors (SpO2, respiration, ECG, temperature) must be digitized from a single battery rail. At 200 kSPS aggregate across 4 channels (50 kSPS per channel), 12-bit resolution is sufficient for IEC 60601-1-8 clinical-grade SpO2 desaturation detection. The 1.55 mW power at 200 kSPS keeps total board draw below 5 mW, and the 0.06 µA shutdown mode preserves battery life between readings - critical for wearable 5-day telemetry patches.
Được đề xuất
Industrial Multi-Sensor Module (PLC / 4-20 mA Digitizer)
Industrial PLCs and remote I/O modules need 4-20 mA loop digitizers at 12-bit accuracy. The ADC124S051CIMM provides 4 single-ended inputs at 500 kSPS, allowing simultaneous digitizing of 4 loop currents at 125 kSPS each - well above the 100 Hz bandwidth required for process control. Pair the part with an external 2.5 V reference (TI REF3025) and a current-sense amplifier such as the INA240 to digitize ground-referenced 4-20 mA loops. The 10-VSSOP footprint and -40°C to +85°C rating fit compact DIN-rail modules.
Được đề xuất
Optical Module Monitoring (SFP / QSFP Transceivers)
SFP and QSFP optical transceivers require monitoring of 4-6 analog signals: TX bias, TX power, RX power, and temperature. The ADC124S051CIMM digitizes 4 of these via its 4 single-ended channels at 200-500 kSPS, providing 12-bit accuracy for the 0.1 dB laser-power reporting required by SFF-8472. With a single 3.3V supply and 1.55 mW dissipation, it slots into the module's tight power budget. The shutdown pin enables <1 µA standby, vital for host-side power of sleeping optical links.
Được đề xuất
Battery Management Telemetry (BMS Cell Monitor)
Battery management systems digitize cell voltages, pack current, and temperature at 12-bit resolution. The ADC124S051CIMM's 4 channels can monitor 4 cell voltages at 100 kSPS aggregate, providing 12-bit (1.2 mV at 4.096 V reference) accuracy - sufficient for cell balancing decisions. The 0.06 µA shutdown mode preserves quiescent current during sleep, critical for long-storage battery packs. Pin-compatible with TI's BMS-focused ADC family for migration to higher-resolution or higher-channel devices in future generations.
Được đề xuất
Factory Automation Backplane (Sensor Hub / Edge Node)
Industrial edge nodes aggregate 4 analog sensor inputs - temperature, pressure, humidity, and flow - over a 4-20 mA or 0-10V interface. The ADC124S051CIMM digitizes all 4 at 12-bit/500 kSPS, supporting deterministic 100 µs conversion cycles per channel needed for closed-loop control. Its single 5V supply simplifies field-side power design, and the VSSOP-10 footprint allows the digitizer to sit adjacent to each input connector. Pair with an RS-485 transceiver (such as TI ISO3086) for isolated backplane communication.
Được đề xuất
Multi-Channel Data Acquisition Card (USB / PC-Based DAQ)
PC-based data acquisition cards require 4-8 simultaneous-monitor analog inputs at 12-bit resolution and >100 kSPS aggregate. The ADC124S051CIMM delivers 4 channels at 500 kSPS, supporting continuous streaming to a host MCU or FPGA over SPI. Its 0.06 µA shutdown mode enables burst-mode acquisition that keeps average power below 100 µW. Common configurations pair four ADC124S051s in parallel for a 16-channel DAQ card, all sharing the same 10-VSSOP footprint for layout uniformity.
Được đề xuất
IoT Sensor Node (Smart Building / HVAC)
Smart-building HVAC and IoT sensor nodes aggregate 4 analog signals - temperature, humidity, light, and gas - over a single ADC. The ADC124S051CIMM at 200 kSPS provides 50 kSPS per channel, which is more than sufficient for 10 Hz environmental monitoring. Its 1.55 mW typical power enables multi-year battery life on coin cells when paired with duty-cycled sampling and the 0.06 µA shutdown mode. The 10-VSSOP package is small enough to fit alongside a wireless MCU like the CC2640 in a 25 mm × 25 mm sensor beacon.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADC124S051CIMM — 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 | ADC124S051CIMM/NOPB | ADC084S051CIMM | ADC124S021CIMMX | ADC122S101CIMM | ADS7841E | MCP3204-CI/MS |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Microchip Technology |
| Package | VSSOP-10 (DGS) | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | VSSOP-10 (DGS) - same | MSOP-10 - same footprint family |
| Resolution | 12 bit | 12 bit | 8 bit (-33%) | 12 bit | 12 bit | 12 bit | 12 bit |
| Maximum Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 50 kSPS (-90%) | 500 kSPS | 200 kSPS (-60%) | 100 kSPS (-80%) |
| Number of Channels | 4 | 4 | 4 | 4 | 2 (-50%) | 4 | 4 |
| 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 5.0 V | 2.7 V to 5.5 V |
| Lifecycle Status | Obsolete | Active (lead-free variant) | Obsolete | Active | Active | Active | Active |
| SPI Frame Format | 12-bit two-byte MSB-first | Identical 12-bit two-byte MSB-first | 8-bit one-byte (different length) | Identical 12-bit two-byte MSB-first | Identical 12-bit two-byte MSB-first | 12-bit two-byte MSB-first (frame timing differs) | 12-bit two-byte MSB-first (one extra SCLK) |
| Approximate Unit Price (qty 100) | USD 5.20 | USD 4.95 | USD 4.20 | USD 3.80 | USD 4.60 | USD 5.10 | USD 4.40 |
Bảo phân biệt quan trọng
- Pin-compatible migration path across resolution and speed grades (vsMicrochip MCP3204-CI/MS)
- Lowest quiescent shutdown current in its class (vsMCP3204-CI/MS)
- Single-supply 2.7 V to 5.25 V with no level shifter required (vsADS7841E)
- Active lead-free variant available on same die (vsMCP3204-CI/MS)
Ghi chú thiết kế
Power-supply decoupling: place a 10 µF tantalum (or 4.7 µF X7R ceramic) plus a 0.1 µF ceramic within 5 mm of the VA pin to suppress the high-frequency switching noise of the SAR ADC's internal charge pump. The 1.55 mW typical at 200 kSPS means 3.3V × 470 µA, and bypassing that ripple with a ferrite bead on the VA trace is recommended for noise-sensitive multi-channel boards. The SHDN pin drops quiescent current to 0.06 µA when pulled low - use a 10 kΩ pull-down for failsafe.
VREF trace routing: route the external reference trace as a guard trace with a ground-fill on both sides, keeping the trace length under 10 mm. Place the 10 µF + 0.1 µF VREF decoupling directly at the pin. Route AIN1+ and AIN1- as a matched pair (length-matched within 2 mm) and keep them on the analog layer with a continuous ground plane underneath. The DOUT trace should be routed away from analog inputs to avoid digital-to-analog coupling.
Input kickback and multiplexer crosstalk: the SAR ADC's internal sample-and-hold capacitor (~20 pF) charges from the analog input on every conversion, injecting a small kickback spike. Avoid driving the analog inputs from high-impedance sources (>10 kΩ) without an input buffer such as the OPA2333 - a series RC of 50 Ω + 100 pF at each input can dampen the kickback if a buffer is unavailable. For multi-channel scanning, allow at least one full conversion cycle between channel switches for settling to 12-bit accuracy.
Common pitfalls: (1) Do not leave SHDN floating - it must be tied high to VA via a pull-up or driven by the MCU; floating SHDN leaves the part in indeterminate state. (2) Do not exceed the maximum VREF rating (VDD) - reference voltages above VA damage the input ESD structure. (3) Do not apply analog inputs before VA is powered up - the input ESD clamp draws current through the analog input. (4) The CS# pin must be held low for the entire conversion to avoid premature DOUT transitions.
Thông tin tuân thủ
ADC124S051CIMM (non-NOPB) is lead-bearing for legacy applications; the /NOPB suffix is the lead-free RoHS-compliant variant. Not AEC-Q100 qualified - for automotive applications use AEC-Q100-qualified SAR ADCs in TI's automotive portfolio.
