ADC124S051CIMMX - 12-Bit 500kSPS 4-Ch SAR ADC | Texas Instruments
MPN: ADC124S051CIMMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.62 | $3.62 |
| 10 | $3.26 | $32.60 |
| 100 | $2.89 | $289.00 |
| 500 | $2.57 | $1,285.00 |
| 1,000 | $2.28 | $2,280.00 |
| 3,500 | $1.99 | $6,965.00 |
ADC124S051CIMMX Overview
An SAR ADC (Successive-Approximation-Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and a low-power internal DAC to digitize an analog input in N clock cycles (where N is the resolution). SAR converters sit in the broader hierarchy of analog-to-digital converters (ADCs) -> data converters -> mixed-signal ICs -> semiconductor. Compared to delta-sigma and pipeline ADCs, SAR parts offer deterministic latency, no pipeline delay, low power consumption, and excellent DC accuracy, making them the dominant architecture for multiplexed multi-channel applications up to a few MSPS.
Key specifications include 500 kSPS maximum throughput, four single-ended analog input channels multiplexed by an internal sequencer, a single-ended external reference tied to the supply voltage (AVDD reference mode), 4-channel sequential sampling with one ADC core, and -40C to +85C industrial-temperature-range operation. The serial output is daisy-chain-capable, enabling multiple ADC124S051 devices on one SPI bus without an external decoder.
The device uses a charge-redistribution SAR architecture with an internal sample-and-hold, achieving 12-bit resolution with no missing codes, low aperture jitter, and excellent AC performance at the 200-500 kSPS throughput window. The supply voltage (2.7V to 5.25V) doubles as the reference, simplifying the bill of materials but binding noise performance directly to AVDD quality.
Typical applications include optical networking monitoring, industrial process control data acquisition, multi-zone temperature acquisition, handheld instrumentation, and consumer audio/video processing. Designers favour the part for its small 10-pin VSSOP footprint when four channels of moderate-speed 12-bit conversion are needed and board area is constrained.
When designing with this part, treat the analog supply (AVDD) as the reference: a clean AVDD with adequate local decoupling (10 uF bulk + 0.1 uF ceramic) is essential. For best DC linearity, drive the four inputs with a low-impedance amplifier; at higher source impedance, throughput must be reduced to allow the internal acquisition window to settle fully.
This page synthesizes distributor pricing, drop-in compatible variants (same 10-VSSOP family), and practical PCB-layout guidance not found in the manufacturer datasheet alone.
Drop-in alternatives for ADC124S051CIMMX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADC124S051CIMMX (same form factor and footprint) — differing in Package, Number of Channels, Operating Temperature, Input Type, Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC124S051CIMMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC124S051CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC122S101CIMM
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.96 / Unit
View Datasheet →ADC122S051CIMMX
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.99 / Unit
View Datasheet →ADC121S705CIMMX
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.85 / Unit
View Datasheet →ADC124S051CIMMX Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 200 ksps to 500 kSPS |
| Number of Channels | 4 input, single-ended |
| Architecture | SAR (Successive Approximation) |
| Throughput Range | 200 ksps to 500 kSPS |
| Conversion Time | 1.625 us typical |
| Linearity Error | 0.0269 % (1 LSB max) |
| Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Output Format | Serial, daisy-chain capable |
| Supply Voltage (Analog/Digital) | 2.7 V to 5.25 V |
| Reference | Supply-referenced (AVDD) |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 10-VSSOP (3 mm x 3 mm) |
| Mounting Type | Surface Mount |
| MSL Level | Level-1 (unlimited floor life) |
| RoHS Status | Compliant |
| Channel Architecture | Multiplexed 4:1, single ADC core |
ADC124S051CIMMX Pin Configuration
| Pin 1 | AVDD — Analog supply, also serves as ADC full-scale reference |
| Pin 2 | AGND — Analog ground return |
| Pin 3 | SCLK — Serial clock input (SPI/QSPI/MICROWIRE-compatible) |
| Pin 4 | DOUT — Serial data output (daisy-chain cascadable) |
| Pin 5 | DIN — Serial data input (for daisy-chain / host control) |
| Pin 6 | CS — Active-low chip-select, frames the conversion cycle |
| Pin 7 | DGND — Digital ground return |
| Pin 8 | IN1 — Analog input channel 1 |
| Pin 9 | IN2 — Analog input channel 2 |
| Pin 10 | IN3/IN4 — Analog input channels 3 and 4 (see datasheet pin configuration diagram) |
Typical Applications
ADC124S051CIMMX is suitable for 6 applications: Multi-Zone Temperature and Sensor Data Acquisition, Optical Networking Monitoring, Industrial Process Control, Handheld Battery-Powered Instrumentation, Consumer Audio/Video Signal-Level Detection, IoT Edge-Sensor Aggregation Hubs.
Multi-Zone Temperature and Sensor Data Acquisition
The ADC124S051CIMMX's four single-ended inputs let one part digitize up to four resistive temperature sensors (RTDs/thermistors) or strain/pressure sensors, eliminating an external mux. Its 500 kSPS throughput comfortably oversamples dc signals, enabling averaging to push effective resolution past 12 bits for slow-changing sensor channels. The supply-referenced input range matches 3.3 V or 5 V sensor rails directly, while the daisy-chain serial port lets multiple ADC124S051 devices share one SPI bus when more than four zones are needed.
Recommended
Optical Networking Monitoring
The four ADC inputs of the ADC124S051CIMMX map cleanly to optical-module monitoring signals (Received Signal Strength Indicator, laser bias current, transmit power monitor, and temperature), and the 500 kSPS rate allows sub-microsecond sampling for AGC loops. The daisy-chain feature lets engineers stack ADC124S051 parts on a single SPI bus when monitoring multi-channel transceivers, and the 10-VSSOP footprint suits the cramped real-estate of SFP-style modules. The serial protocol is SPI/QSPI/MICROWIRE-compatible, simplifying interface to the typical microcontroller in optical line cards.
Recommended
Industrial Process Control
The ADC124S051CIMMX suits 4-20 mA loop-derived voltage monitoring across four loops when paired with burden resistors, with the 500 kSPS throughput providing headroom for simultaneous loop measurements. Industrial -40 C to +85 C rating matches factory-floor requirements, while the small 10-VSSOP package fits the tight PCB geometry of DIN-rail analog input cards. The supply-as-reference topology simplifies the analog front end, although for very tight calibration a dedicated external reference should be considered.
Recommended
Handheld Battery-Powered Instrumentation
The ADC124S051CIMMX's wide 2.7-5.25 V supply range pairs directly with single-cell lithium-ion (3.0-4.2 V) or two-cell AA (2.4-3.2 V) chemistries, and the SAR architecture draws no standby current between conversions to extend battery life. The 10-VSSOP package is only 3x3 mm, ideal for the cramped PCBs of handheld multimeters and portable data loggers. Four multiplexed channels plus daisy-chaining enable expansion to 8, 12, or 16 channels without redesigning the analog front end.
Recommended
Consumer Audio/Video Signal-Level Detection
The four ADC inputs of the ADC124S051CIMMX can digitize left/right audio line levels, composite-video DC restore, and supply-rail voltage simultaneously in consumer audio products. The 500 kSPS sample rate handles full-bandwidth audio envelope detection when audio is bandwidth-limited at the front end. The 10-VSSOP package and modest price support the cost-sensitive consumer A/V market, and the SPI serial output links cleanly to DSP processors in sound bars and A/V receivers.
Recommended
IoT Edge-Sensor Aggregation Hubs
The ADC124S051CIMMX fits IoT aggregation nodes that sample up to four 0-5 V analog sensors (soil moisture, light, proximity, motion) before sending processed data over wireless uplinks. Its 200-500 kSPS range offers more than enough bandwidth for dc-style sensor channels that are then decimated to a few hundred Hz of effective output, while the 12-bit resolution captures the dynamic range of the sensor array. The daisy-chain serial interface and tiny 10-VSSOP keep the hub's bill of materials and PCB area minimal.
Recommended
Recommended Products Summary
Engineering reference data for ADC124S051CIMMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC124S051CIMMX/NOPB | ADC124S051CIMM/NOPB | ADC122S101CIMM | ADC122S051CIMMX | ADC121S705CIMMX |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-VSSOP | 10-VSSOP - same | 10-VSSOP - same | 10-VSSOP - same | 10-VSSOP - same | 10-VSSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Input Channels | 4 | 4 | 4 | 2 (-50%) | 2 (-50%) | 1 (-75%) |
| Maximum Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 1 MSPS (+100%) | 500 kSPS | 500 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 |
| Interface | SPI/QSPI/MICROWIRE (daisy-chain) | SPI daisy-chain | SPI daisy-chain | SPI daisy-chain | SPI daisy-chain | SPI |
| Reference Source | Supply (AVDD) | Supply (AVDD) | Supply (AVDD) | Supply (AVDD) | Supply (AVDD) | Supply (AVDD) |
| Carrier Format | Tape & Reel (3500 pcs) | Tape & Reel | Tube | Tube | Tape & Reel | Tape & Reel |
Key Differentiators
- Four true single-ended channels without an external mux (vs ADC122S101CIMM (dual-channel))
- Daisy-chain serial interface expands channel count without extra GPIO (vs Single-SPI ADC121S705CIMMX (1-channel))
- Tape-and-Reel X-suffix matches modern high-volume SMT lines (vs ADC124S051CIMM/NOPB (Tube))
Design Notes
Because AVDD doubles as the ADC full-scale reference, decouple AVDD with a 10 uF bulk ceramic (X7R) in parallel with a 0.1 uF high-frequency ceramic located within 3 mm of the AVDD and AGND pins. Estimated: a 1 LSB step at 12 bits on a 5 V reference equals 1.22 mV - any 1.2 mV of supply ripple will appear at the ADC output as full-scale noise. For noise-sensitive systems, drive AVDD from a clean LDO such as the TPS7A4701 family instead of a switching regulator.
Route the four analog input traces (IN1-IN4) tightly together to match their delays and place a small RC (10 ohms + 100 pF) close to each pin only if the source impedance exceeds 1 kohm. Place the 10-VSSOP exposed heat-sink pad (PinTab) on a copper island tied to AGND; a separate clean analog ground plane plus a single-star connection at AGND pin keeps digital return currents from corrupting the SAR comparator reference.
Do not exceed 5.25 V on AVDD: the absolute-maximum rating is 6.5 V and the recommended operating maximum is 5.25 V. Drive the serial lines with clean CMOS levels and avoid long SCLK rise times - long rise times cause timing-margin errors on the daisy-chain DOUT stream. Finally, observe the tADQ (acquisition) time specification when switching channels; at the maximum 500 kSPS with high-impedance drivers the channel must be settled before the conversion starts.
Estimated: at 500 kSPS the SCLK frequency will be in the 5-30 MHz range depending on host controller; keep DOUT trace length below 25 mm and add a 20-33 ohm series resistor to damp reflections. Add a 100 kohm pull-up on CSbar to prevent accidental conversions from line transients during power-up.
Compliance Information
RoHS compliance per Texas Instruments product page and DigiKey component listing. /NOPB ordering code confirms JEDEC J-STD-609 lead-free finish. AEC-Q100 not stated for this part number - select an AEC-Q100 grade variant if automotive.
