ADC102S051CIMMX - 10-Bit 2-Ch 500ksps SAR ADC | Texas Instruments
MPN: ADC102S051CIMMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.05 | $30.50 |
| 100 | $2.61 | $261.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.84 | $1,840.00 |
ADC102S051CIMMX Overview
A SAR ADC is a converter architecture that approaches the input voltage one bit at a time using a binary-weighted capacitor DAC and a comparator, then latches the 10-bit result in a single conversion clock. SAR converters inherit a class hierarchy of: SAR ADC -> Nyquist-rate data converter -> analog-to-digital converter -> data-conversion IC -> signal-chain semiconductor. Compared with pipeline or delta-sigma ADCs, SAR parts excel at single-shot latency (no pipeline delay) and deterministic throughput, which makes them preferred for multiplexed control loops and event-triggered sampling where phase and timing are critical.
Key electrical specifications include a 2.7V to 5.25V single supply, ±1 LSB INL (max), ±1 LSB DNL (max) with no missing codes, a SINAD of 61.6 dB at 5V supply, and a power dissipation of approximately 1.6 mW at 3V / 200 ksps. The device operates over the -40C to +85C industrial temperature range and exhibits excellent AC performance with THD typically below -76 dB, making it suitable for instrumentation, sensor read-out, and consumer audio processing chains.
The internal 2.5V reference and sample-and-hold are factory-trimmed; designers need only an input RC network and a 0.1 uF decoupling capacitor at AVDD. A flexible serial interface operates in modes 0 and 4 (CPOL=0, CPHA=0 / CPOL=0, CPHA=1, with /CS controlled by the master). Two fully-differential input channels are time-multiplexed through the same successive-approximation loop, simplifying front-end filtering.
Typical applications include portable industrial telemetry, HVAC sensor digitization, optical-module monitoring, multi-cell battery management system (BMS) data acquisition, consumer audio front-ends, and single-board embedded controllers that already have an MCU or DSP needing analog read-back. The wide supply range lets the part share 3.3V rails with common microcontrollers without level translation.
When laying out, place the 1uF AVDD bypass capacitor as close to the AVDD pin as possible and route analog/digital grounds back to a single point to avoid switching noise corrupting the conversion result. When selecting this part over the pin-compatible ADC104S051 (12-bit) or ADC122S051 (12-bit, 200 ksps), verify whether the application needs 10-bit or 12-bit resolution and whether the maximum sample rate of 500 ksps must be preserved.
Drop-in alternatives for ADC102S051CIMMX — 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 ADC102S051CIMMX (same form factor and footprint) — differing in Package, Number of Channels, Resolution, Digital Interface, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC102S051CIMM
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →ADC102S051CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC102S051CISDX
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC104S051CIMM
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.55 / Unit
View Datasheet →ADC082S021CIMMX
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC081S051CISDX/NOPB
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADC102S051CIMMX Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Channels | 2 (single-ended input) |
| Sampling Rate | 200 ksps to 500 ksps |
| Conversion Architecture | Successive Approximation (SAR) |
| Supply Voltage (AVDD) | 2.7 V to 5.25 V |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB (no missing codes) |
| SINAD | 61.6 dB at 5 V supply |
| THD (typical) | -76 dB |
| Reference | Internal (factory-trimmed) |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP-compatible serial |
| Operating Temperature | -40 C to +85 C (industrial) |
| Package | 8-MSOP / 8-VSSOP (3.00 mm body) |
| Mounting Type | Surface Mount (gull-wing) |
| RoHS Status | Compliant |
ADC102S051CIMMX Pin Configuration
| Pin 1 | IN+ — Positive analog input (channel 0 or muxed per configuration) |
| Pin 2 | GND — Analog and digital ground |
| Pin 3 | IN- — Negative analog input (tie to mid-supply for single-ended) |
| Pin 4 | AVDD — Analog supply, 2.7 V to 5.25 V |
| Pin 5 | /CS — Active-low chip select; falling edge initiates conversion |
| Pin 6 | DOUT — Serial data output (SPI/MICROWIRE) |
| Pin 7 | DIN — Serial data input for control word (tie to GND if unused) |
| Pin 8 | SCLK — Serial clock input (up to ~15 MHz) |
Typical Applications
ADC102S051CIMMX is suitable for 6 applications: Industrial Sensor Telemetry, HVAC Environmental Monitoring, Battery Management System (BMS) Cell Monitoring, Optical Module Diagnostics, Consumer Audio Front-End, Embedded MCU Companion ADC.
Industrial Sensor Telemetry
The ADC102S051CIMMX fits industrial sensor telemetry because its 2-channel input and 500 ksps throughput cover two analog sensors (temperature, pressure, or strain gauge) with deterministic per-sample latency that matches PTU-class control loops. According to the TI ADC102S051 datasheet, the internal 2.5 V reference and ±1 LSB INL accuracy let designers drop external reference ICs from the BOM, while the SPI/QSPI-compatible serial interface attaches directly to most 32-bit MCUs at 3.3 V. Compared with delta-sigma ADCs at this bandwidth, the SAR architecture eliminates pipeline delay so closed-loop control loops see the same conversion-to-output timing every cycle, which simplifies software triggers. Designers place a 1 uF AVDD bypass and a 10 ohm input ferrite to keep digital switching noise out of the SAR comparator.
Recommended
HVAC Environmental Monitoring
The ADC102S051CIMMX digitizes temperature, humidity, and airflow sensors in HVAC controllers because its 2.7 V to 5.25 V supply range operates directly from 3.3 V system rails. According to TI datasheet figures, SINAD of 61.6 dB at 5 V translates to ~10 effective bits, more than adequate for ±0.5 C temperature read-back after calibration, while the 500 ksps sample rate is several orders of magnitude beyond the kHz polling needed for slow environmental loops. The wide -40 C to +85 C industrial temperature grade lets the part sit in unconditioned equipment rooms, and the small MSOP-8 footprint fits densely populated backplanes. Designers often pair it with resistive divider ladders for 0-10 V industrial sensor inputs.
Recommended
Battery Management System (BMS) Cell Monitoring
The ADC102S051CIMMX is widely used in multi-cell BMS data acquisition because its true-differential input rejects common-mode stack voltage noise on lithium packs and its 500 ksps rate oversamples cell voltages several thousand times per second. According to TI application guidance, designers stack the part with external resistor dividers and an anti-alias RC on each cell tap, and the SPI output fans into an MCU cell-balancer; the 10-bit resolution is sufficient for state-of-charge and state-of-health calculations after digital filtering. The SAR single-shot latency means a cell-fault event is detected within a single conversion cycle, which is critical for protection circuits that must disconnect the pack on over-temperature events.
Recommended
Optical Module Diagnostics
The ADC102S051CIMMX fits SFP/QSFP optical-module diagnostic loops because it measures laser back-face monitor and case temperature from a single 3.3 V rail. According to the datasheet, the 2-channel mux lets one IC capture both the APD photocurrent (via transimpedance amplifier) and the TEC thermistor voltage, while the SPI interface shares the same bus as the module's I2C EEPROM so firmware reads temperatures without an extra ADC chip. The low 1.6 mW typical power at 3 V keeps the part inside tight optical-module power budgets, and the industrial -40 C to +85 C grade spans outdoor deployment. Designers wire IN- to mid-supply (1.65 V) for pseudo-differential measurements.
Recommended
Consumer Audio Front-End
The ADC102S051CIMMX digitizes line-level audio and microphone pre-amp outputs in soundbars, smart speakers, and headset dongles where 10-bit resolution is acceptable. According to the datasheet, SINAD of 61.6 dB translates to roughly 10 effective bits at 5 V supply, providing ~60 dB dynamic range, and THD of -76 dB keeps harmonic distortion below audibility thresholds. The 500 ksps top sample rate comfortably captures 44.1 kHz audio with substantial room for decimation filters, and the SPI interface streams decoded samples into Bluetooth SoCs or DSP cores. Designers add a 2nd-order RC anti-alias filter in front of the input to condition consumer-audio bandwidth.
Recommended
Embedded MCU Companion ADC
The ADC102S051CIMMX is the typical companion ADC for 32-bit MCUs that lack sufficient analog channels, such as industrial IoT gateways and motor-control boards. According to TI application guidance, the SPI port is shared with other peripherals using the /CS chip-select line, and modes 0/4 mean that virtually any Cortex-M or PIC32 MCU can clock it directly without glue logic. The wide 2.7-5.25 V supply matches 3.3 V and 5 V MCUs; the MSOP-8 package occupies less than 9 mm^2 of PCB area. Design teams use it to add 2 extra high-speed analog inputs for current sensing (via shunt) or for thermistor battery monitoring.
Recommended
Recommended Products Summary
Engineering reference data for ADC102S051CIMMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC102S051CIMM | ADC102S051CIMM/NOPB | ADC104S051CIMM | ADC082S021CIMMX | ADC081S051CISDX |
|---|---|---|---|---|---|---|
| Package | MSOP-8 / 8-VSSOP | MSOP-8 (3.0 mm) - same | MSOP-8 (3.0 mm) - same | MSOP-8 (3.0 mm) - same | MSOP-8 (3.0 mm) - same | MSOP-8 (3.0 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 10 bits | 10 bits | 10 bits | 12 bits | 8 bits | 10 bits |
| Max Sample Rate | 500 ksps | 500 ksps | 500 ksps | 500 ksps | 200 ksps | 500 ksps |
| Number of Channels | 2 (single-ended) | 2 | 2 | 2 | 2 | 1 |
| 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 |
| INL (max) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB | ±0.5 LSB | ±1 LSB |
| Internal Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS Compliant | Yes | Yes | Yes (NOPB) | Yes | Yes | Yes |
Key Differentiators
- Drop-in upgrade path to 12-bit resolution without PCB rework (vs ADC104S051CIMM)
- Lower throughput alternative for cost-sensitive applications (vs ADC082S021CIMMX)
- Same package footprint available with single-channel pinout for simpler designs (vs ADC081S051CISDX)
Design Notes
The ADC102S051CIMMX requires a clean 2.7 V to 5.25 V AVDD rail; place a 1 uF X7R ceramic bypass capacitor within 2-3 mm of the AVDD pin and add a 0.1 uF capacitor in parallel to shunt high-frequency switching noise. For designs where AVDD is shared with digital logic, route the analog and digital domains through a ferrite bead or small RC filter to prevent MCU switching noise from corrupting the SAR comparator decisions.
Use a single-point star ground routing strategy where the AGND pin returns to a board-level quiet ground island, avoiding shared traces with high-current digital return paths. Keep analog input traces short and guarded with ground pours to minimize charge injection from adjacent digital signals. When running the SPI bus above 10 MHz, place source-terminating resistors near the host MCU DOUT to reduce reflections on the SCLK edge transitions.
Do not leave the DIN pin floating. If the host MCU does not drive DIN, tie it to GND to prevent spurious /CS triggers that consume conversion cycles and corrupt the first sample. Also, when switching the input mux between channels, the first conversion after a channel change contains residual charge from the previous sample's hold capacitor and should be discarded if timing is critical.
Add a small anti-alias RC network (typically 100 ohm + 1 nF) on each analog input to filter broadband noise above the Nyquist rate, especially when the input source has high source impedance. Estimate: at 500 ksps with 2-channel muxing, the effective bandwidth per channel is ~250 kHz, so the RC corner should sit at or below that frequency to avoid aliasing noise into the conversion result.
Compliance Information
RoHS compliant per TI environmental listings. Lead-free finish is explicit on the CIMM/NOPB suffix variant. AEC-Q100 qualification not available for this family; choose TI's automotive-grade ADC if required.
