ADC102S021CIMMX - 10-Bit 2ch 200ksps SAR ADC | TI | 8-VSSOP
MPN: ADC102S021CIMMX ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.46 | $34.60 |
| 100 | $3.05 | $305.00 |
| 500 | $2.62 | $1,310.00 |
| 1,000 | $2.28 | $2,280.00 |
ADC102S021CIMMX Overview
A SAR ADC is a precision converter that uses a binary-search algorithm across an internal capacitive DAC to digitize an input voltage one sample at a time, with deterministic latency and no pipeline delay. Within the broader IC taxonomy, the ADC102S021CIMMX belongs to successive-approximation ADCs -> data converters -> ADC/DAC -> signal-conditioning ICs -> analog semiconductors. The SAR topology makes this device well suited to multiplexed multi-channel systems and DSP front-ends where deterministic conversion timing simplifies interrupt-driven software design.
Key differentiating features include two single-ended input channels multiplexed into the same 10-bit core, a high-speed serial output that frames the conversion result in a 16-bit stream (10 data bits plus control overhead), and a power-down pin reducing consumption to 0.12 µW at 3V or 0.47 µW at 5V for battery-aware designs. The wide 2.7V–5.25V supply range allows direct connection to both 3.3V microcontrollers and 5V legacy analog rails without level translation.
Architecturally, the converter pairs an internal track-and-hold with a charge-redistribution SAR loop and an on-chip clock generator, eliminating the need for an external conversion clock. The internal reference is not included — the device requires an external reference voltage applied to the VREF pin — which lets the user optimize noise/spurious performance for the chosen analog signal range.
Typical applications include multi-channel sensor signal acquisition in industrial control loops, optical-module monitor photodiode digitizing, battery-cell voltage and temperature monitoring in portable battery-powered systems, motor-control current and back-EMF sampling, and general-purpose precision data-acquisition front-ends in cost-sensitive consumer or industrial products.
When designing with this part, place the external reference decoupling capacitor as close as possible to the VREF pin and route analog and digital grounds on a single star back to the converter GND pin to minimize code-dependent errors at low input levels. Note that the ADC102S021CIMMX is currently marked Obsolete at major distributors — the /NOPB variant and pin-compatible family members remain in volume production for new designs.
This page consolidates distributor pricing, pin-compatible SAR ADC alternatives, and application-circuit guidance not always present on the manufacturer product page.
Drop-in alternatives for ADC102S021CIMMX — 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 ADC102S021CIMMX (same form factor and footprint) — differing in Number of Channels, Package, Resolution, Architecture, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC102S021CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S021CIMMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S021CIMM
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S051CIMMX/NOPB
✅ Drop-In✓ In Stock
$1.3 / Unit
View Datasheet →ADC102S051CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC084S021CIMMX
✅ Drop-In✓ In Stock
$1.6 / Unit
View Datasheet →ADC082S021CIMMX
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC102S021CIMMX Maximum Ratings & Electrical Characteristics
| Resolution | 10 bit |
| Number of Channels | 2 |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate Range | 50 ksps to 200 ksps |
| Input Type | Single-Ended |
| Supply Voltage | 2.7 V to 5.25 V |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Power Consumption (3V supply) | 1.94 mW |
| Power Consumption (5V supply) | 6.9 mW |
| Power-Down Current (3V) | 0.12 µW |
| Power-Down Current (5V) | 0.47 µW |
| Operating Temperature | -40 °C to +85 °C |
| Package | 8-VSSOP (MSOP-8) |
| Reference | External (VREF pin) |
| RoHS Status | Compliant (lead-free version available with /NOPB suffix) |
ADC102S021CIMMX Pin Configuration
| Pin 1 | CS — Chip Select (active low) — initiates conversion when pulled low |
| Pin 2 | CH0 — Analog input channel 0 |
| Pin 3 | IN- — Analog common / ground reference for the input signal |
| Pin 4 | IN+ / VIN — Analog input channel 1 / positive analog input |
| Pin 5 | VREF — External voltage reference input — defines full-scale range |
| Pin 6 | VDD — Positive supply, 2.7 V to 5.25 V |
| Pin 7 | SCLK — Serial clock for SPI/QSPI/MICROWIRE interface |
| Pin 8 | DOUT — Serial data output — conversion result and channel tag |
Typical Applications
ADC102S021CIMMX is suitable for 6 applications: Industrial Multi-Channel Sensor Acquisition, Optical Module Monitor Photodiode Digitizing, Battery Cell Voltage and Temperature Monitoring, Motor Control Current and Back-EMF Sensing, General-Purpose Data Acquisition Front-Ends, Consumer Audio and Appliance User-Interface Sensing.
Industrial Multi-Channel Sensor Acquisition
The ADC102S021CIMMX is well suited to multi-channel sensor acquisition in industrial control loops because its two single-ended inputs can be multiplexed into a shared 10-bit SAR core that delivers deterministic latency. With 50–200 ksps of sample rate, the device digitizes thermocouple-conditioned signals, 4–20 mA loop-derived voltages, and bridge-excited strain-gauge outputs at the bandwidth needed for closed-loop control. Running from a +5V analog rail with only 6.9 mW dissipation, it leaves thermal headroom for a densely populated PLC analog-input module. The SAR architecture finishes one conversion per CS cycle, simplifying deterministic interrupt service routines in the host MCU. Designers should pair the device with a low-noise reference such as REF3140 and place the VREF bypass capacitor within 3 mm of the pin.
Recommended
Optical Module Monitor Photodiode Digitizing
The ADC102S021CIMMX fits optical-module monitor photodiodes because the two single-ended input channels can digitize the receive-side monitor PD and the transmit-side PD from a SFP/QSFP-style module simultaneously. The 10-bit resolution over a 0–VREF input range provides better than 0.1% step granularity for typical 3.3V-referenced photodiode biasing, while the 200 ksps maximum sample rate captures fast laser-power transients during transmit enable. SPI compatibility means a single MCU pin can read both channels without glue logic. Power-down mode dropping to 0.12 µW (3V) lets the module idle the ADC between management-interface polls, extending module standby time. Decouple VREF and VDD locally to limit switching noise from the surrounding optical driver circuitry from coupling into the SAR comparator.
Recommended
Battery Cell Voltage and Temperature Monitoring
Battery cell voltage and temperature monitoring in portable battery packs benefits from the ADC102S021CIMMX's wide 2.7V–5.25V supply and sub-microwatt power-down mode. With 10-bit resolution and 200 ksps throughput, the converter can serialize multi-cell voltage readings fast enough for cell-balancing decisions in 4S–6S Li-ion or LiFePO4 packs, while the 0.12 µW power-down draw at 3V preserves standby battery life. The two channels naturally match a pack that needs one voltage reading plus one NTC-derived temperature value per cell group, halving the BOM cost versus dual-ADC approaches. Designers should add an RC filter on each analog input to reject battery-stack switching noise. Pin-compatible higher-rate TI parts in the same VSSOP-8 family allow seamless migration to higher cell counts.
Recommended
Motor Control Current and Back-EMF Sensing
Motor control current and back-EMF sensing in brushed-DC and low-cost brushless-DC controllers use the ADC102S021CIMMX to digitize shunt-resistor currents and BEMF phase voltages during PWM off-time. The SAR architecture's deterministic single-conversion latency guarantees that the controller's ADC reading is phase-locked to the PWM cycle, which is essential for field-oriented control (FOC) algorithms in cost-sensitive BLDC drives. The two channels allow simultaneous current and voltage sensing, and the 50–200 ksps range covers up to several kHz of electrical bandwidth — enough for small appliances, drones, and e-bikes. The 1.94 mW at 3V dissipation keeps thermal impact on the small inverter board negligible. Add a 100 Ω / 1 nF RC filter on each input to attenuate PWM-edge ringing.
Recommended
General-Purpose Data Acquisition Front-Ends
General-purpose data-acquisition systems in cost-sensitive industrial and consumer products leverage the ADC102S021CIMMX's 10-bit/200 ksps envelope as a 'just-right' data-acquisition front-end. The two channels cover differential-via-software and single-ended inputs, while the 16-bit serial data frame includes configuration bits that allow channel selection without a separate MUX IC. With a +5V supply the part dissipates only 6.9 mW, allowing fanless low-power data loggers. Compatibility with SPI, QSPI, and MICROWIRE means the part drops onto virtually any MCU or DSP host without glue logic. For higher-precision systems requiring 12+ bits, designers should consider the TI ADS7042 or ADS7142 instead; for higher sample rates in the same footprint, the ADC102S051 family is the pin-compatible upgrade.
Recommended
Consumer Audio and Appliance User-Interface Sensing
Consumer audio and appliance user-interface sensing uses the ADC102S021CIMMX for rotary-knob position readout, touch-slider proximity sensing, and battery-pack state-of-charge measurement in products where 10-bit resolution is more than sufficient. The two channels support a knob position sensor plus a push-button or temperature channel; the SPI interface drives the host MCU with deterministic latency suitable for LED-animation synchronisation. Operating from a +3.3V rail with only 1.94 mW dissipation, the converter fits comfortably inside an always-on IoT appliance or a wireless speaker. The 0.12 µW power-down mode at 3V lets the entire UI section idle between user interactions, extending battery life. Use the power-down pin to gate conversions during deep-sleep cycles.
Recommended
Recommended Products Summary
Engineering reference data for ADC102S021CIMMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC102S021CIMM/NOPB | ADC102S021CIMMX/NOPB | ADC102S051CIMMX/NOPB | ADC084S021CIMMX |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-VSSOP / MSOP-8 | 8-VSSOP / MSOP-8 — identical | 8-VSSOP / MSOP-8 — identical | 8-VSSOP / MSOP-8 — identical | 8-VSSOP / MSOP-8 — identical |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 8 bit |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| Sample Rate Range | 50 ksps to 200 ksps | 50 ksps to 200 ksps | 50 ksps to 200 ksps | 50 ksps to 500 ksps | 50 ksps to 200 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 |
| RoHS Status | Lead-free (not RoHS-marked on base part) | RoHS-compliant | RoHS-compliant | RoHS-compliant | RoHS-compliant |
Key Differentiators
- Wide 50–200 ksps fully specified sample-rate range (vs ADC102S051 family)
- Sub-microwatt power-down mode (vs ADC084S021CIMMX (8-bit sibling))
- Direct cross-family migration path to 500 ksps (vs ADC102S051CIMMX/NOPB)
Design Notes
Estimated: at +3V supply the ADC102S021CIMMX draws about 0.647 mA (1.94 mW / 3V) during continuous conversion. Provide a series ferrite bead or 10 Ω resistor between the analog supply rail and the VDD pin, with a 0.1 µF ceramic bypass within 2–3 mm of VDD, to prevent digital switching currents from corrupting the SAR comparator reference. Power-down via CS idle collapses consumption to 0.12 µW at 3V, ideal for duty-cycled battery-powered designs.
Place the external VREF decoupling capacitor (typically 0.1 µF X7R) as close as physically possible to the VREF pin and route VREF trace away from the SPI clock and data lines. Star-ground the analog GND and digital GND at the ADC102S021CIMMX GND pin to minimize code-dependent grounding errors. Keep analog input traces short and symmetric so that parasitic mismatch does not degrade AC performance.
Do not source more than 200 mV above VREF on CH0/CH1 inputs; over-driving the input will saturate the SAR capacitor array and potentially cause long-term drift. Ensure the host MCU's SPI master is configured to match the ADC's data-clock phase (typically mode 0, CPOL=0, CPHA=0) — mismatched modes appear as 'garbage' data without raising any error flag. Also confirm the host provides at least 16 SCLK cycles per conversion; shorter frames will truncate the conversion result.
Place a 100 Ω series resistor and 1 nF capacitor on each analog input forming a 160 kHz anti-alias filter — sufficient for the 200 ksps Nyquist while attenuating PWM-coupled noise in motor-control or sensor-front-end applications. Keep filter ground returns to a single point adjacent to the ADC102S021CIMMX GND pin. For longer input traces (>25 mm), consider a unity-gain OPA333 buffer between the input RC network and the ADC input pin to avoid code-dependent settling errors.
Compliance Information
Base ADC102S021CIMMX is lead-free but not RoHS-marked; the /NOPB-suffixed variants are fully RoHS-compliant per TI declarations. No AEC-Q100 automotive grade exists in this family. Reach SVHC compliance confirmed via distributor listings; halogen-free status not explicitly stated by TI for the base variant.
