ADC101S051CISD - 10-Bit 500ksps SAR ADC, SPI/QSPI | TI
MPN: ADC101S051CISD ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.32 | $132.00 |
| 500 | $1.08 | $540.00 |
| 1,000 | $0.91 | $910.00 |
| 3,000 | $0.78 | $2,340.00 |
ADC101S051CISD Overview
A SAR ADC is a successive-approximation analog-to-digital converter: it converts an input voltage to a digital code by performing a binary search against an internal DAC, one bit per clock cycle. SAR ADCs offer deterministic latency, no pipeline delay, and excellent DC accuracy for a given resolution - they sit in the hierarchy analog-to-digital converter -> data converter -> signal chain IC -> semiconductor, and dominate low-to-medium speed precision applications where the sample-hold behavior must be repeatable per conversion.
Key specifications of the ADC101S051CISD include 10-bit resolution, an input voltage range from 0V to VA, ±1 LSB INL (max), ±1 LSB DNL (max) with no missing codes, a single 2.7V-5.25V supply, two power-down modes (full power-down <1 uA, partial power-down ~600 uA at 5V), and typical power consumption of 2.7 mW at 3.6V and 9.7 mW at 5.25V. The -40°C to +85°C industrial operating range supports distributed industrial-sensor deployments.
The device combines an input sample-and-hold, the SAR core, an internal reference, and a serial output stage in one compact 6-pin package. Because the reference is internal, BOM cost and PCB area drop versus external-reference SAR ADCs of comparable speed, making the part attractive for space-constrained designs that still need 50 ksps-class or 500 ksps-class conversions with a fast serial interface.
Typical applications include industrial process-control modules, portable battery-powered instrumentation, sensor digitizers (strain, pressure, temperature front-ends), consumer audio front-panel controls, and general-purpose data-acquisition boards where a microcontroller's SPI peripheral provides the clock and reads the conversion result.
When designing with this ADC, place a 0.1 µF bypass capacitor as close as possible to the VA pin to keep digital switching noise off the analog reference; keep the analog input trace short and guarded, and route the SCLK and DOUT traces away from fast digital edges to preserve the converter's noise floor.
This product page synthesizes the manufacturer's datasheet, distributor pricing tiers, drop-in alternatives in the same 6-pin WSON footprint, and practical layout notes not bundled in the datasheet.
Drop-in alternatives for ADC101S051CISD — 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 ADC101S051CISD (same form factor and footprint) — differing in Package, Digital Interface, Operating Temperature, Resolution, Power Consumption (3.6 V).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC101S051CISD/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC081S051CISDX/NOPB
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADC081S051CISD
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ADC101S021CISDX
✅ Drop-In✓ In Stock
$1.32 / Unit
View Datasheet →ADC101S021CIMFX
✅ Drop-In✓ In Stock
$1.4 / Unit
View Datasheet →ADC081S021CISD
✅ Drop-In✓ In Stock
$0.65 / Unit
View Datasheet →ADC101S051CISD Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Number of Channels | 1 |
| Sample Rate (max) | 500 ksps |
| Sample Rate (min) | 200 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Supply Voltage (VA) | 2.7 V to 5.25 V |
| Analog Input Range | 0 V to VA |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| Missing Codes | 0 (no missing codes) |
| Reference | Internal |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible |
| SCLK Frequency | 4 MHz to 10 MHz |
| Output Coding | Straight binary |
| Power Consumption @ 3.6 V | 2.7 mW (typical) |
| Power Consumption @ 5.25 V | 9.7 mW (typical) |
| Power-Down Current | <1 µA (full power-down) |
| Partial Power-Down Current | ~600 µA at 5 V |
| Package | 6-WSON (also referenced as 6-pin HVSON) |
| Operating Temperature | -40°C to +85°C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ADC101S051CISD Pin Configuration
| Pin 1 | VA — Analog supply voltage (2.7V to 5.25V); also the reference for the analog input |
| Pin 2 | GND — Ground return for VA and digital interface |
| Pin 3 | CS — Chip select, active low; enables serial interface |
| Pin 4 | SCLK — Serial clock input; 4 MHz to 10 MHz per TI datasheet |
| Pin 5 | DOUT — Serial data output; straight-binary, MSB-first |
| Pin 6 | IN — Analog input; input range is 0V to VA |
Typical Applications
ADC101S051CISD is suitable for 7 applications: Industrial Sensor Digitizing, Portable Battery-Powered Instrumentation, Process-Control Analog Input Modules, Consumer Audio Front-Panel Controls, General-Purpose Data Acquisition Boards, IoT Sensor Nodes with Periodic Sampling, Touch / Proximity Front-End Readout.
Industrial Sensor Digitizing
The ADC101S051CISD fits industrial sensor modules because its 500 ksps sample rate and ±1 LSB INL/DNL allow it to digitize strain-gauge bridges, pressure transducers, and temperature-front-end outputs with 1024-code resolution. According to the TI datasheet, the 2.7V-5.25V single supply accepts 3.3V and 5V industrial rails without level shifting. The two power-down modes drop quiescent current below 1 µA between conversions, supporting loop-powered 4-20 mA sensor heads. The SPI interface is read by a host microcontroller that takes the conversion result and formats it for HART or IO-Link.
Recommended
Portable Battery-Powered Instrumentation
The ADC101S051CISD is well suited to portable, battery-powered instruments because it accepts 2.7V and runs on roughly 2.7 mW at 3.6V. The full-power-down mode drops current below 1 µA between samples, enabling multi-year battery life on periodic-sampling data loggers. TI datasheet specifies the part operates across the industrial -40°C to +85°C range, so handheld instruments in factory or outdoor environments are supported. The straight-binary SPI output is read directly by low-power MCUs like MSP430 with DMA, offloading the CPU.
Recommended
Process-Control Analog Input Modules
The ADC101S051CISD serves PLC analog-input cards that read 0-5V or 0-10V (resistor-scaled) process signals at moderate update rates. With 500 ksps throughput and SAR architecture, the conversion latency is deterministic per sample, which simplifies input-to-output timing analysis for safety-critical process loops. According to TI product documentation, the 6-pin WSON footprint packs densely on multi-channel analog-input boards, and one ADC can be shared across multiple channels through an external analog mux such as the MUX36S08.
Recommended
Consumer Audio Front-Panel Controls
The ADC101S051CISD supports consumer audio front-panel control knobs where a potentiometer or rotary encoder is read as an analog voltage. 10-bit resolution is sufficient for smooth volume, balance, and tone control response, while the 500 ksps capability gives plenty of headroom for the few-ksps update rate a UI actually requires. The small 6-pin WSON footprint fits behind a 5 mm panel-mount pot, and the internal reference eliminates the need for a separate reference IC that would otherwise add BOM cost.
Recommended
General-Purpose Data Acquisition Boards
The ADC101S051CISD is a typical choice for low-cost USB or microcontroller-based DAQ boards targeting education and hobbyist markets. The 10-bit resolution covers most bench instrumentation needs at sub-millivolt input ranges when paired with an external amplifier. TI datasheet confirms SPI/QSPI/MICROWIRE compatibility, allowing it to interface with virtually any microcontroller or FPGA on the market. The SCLK range of 4-10 MHz accommodates the SPI clocks available on common MCUs without requiring a clock-divider or PLL.
Recommended
IoT Sensor Nodes with Periodic Sampling
The ADC101S051CISD fits IoT sensor nodes that wake, take a single conversion, transmit over BLE or sub-GHz radio, and sleep. The full-power-down mode drops current below 1 µA between samples, which is critical for coin-cell or energy-harvesting nodes targeting years of operation. According to TI datasheet, the SAR architecture finishes one conversion in 16 SCLK cycles, so the wake-active duty cycle stays short. The SPI output goes straight to an ultra-low-power MCU such as CC2640 for radio transmission.
Recommended
Touch / Proximity Front-End Readout
The ADC101S051CISD supports touch and proximity front-ends where capacitive sensors are read through an analog front-end and digitized for threshold detection. 500 ksps is well above the few-ksps needed by touch decoding algorithms, leaving ample speed margin. The 6-WSON package fits on crowded touch-panel PCBs. The internal reference simplifies the BOM compared to external-reference SAR ADCs, which matters for cost-sensitive consumer and appliance applications. SPI lets the host MCU process the conversion directly without extra glue logic.
Recommended
Recommended Products Summary
Engineering reference data for ADC101S051CISD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC101S051CISD/NOPB | ADC081S051CISDX/NOPB | ADC081S051CISD | ADC101S021CISDX | ADC101S021CIMFX | ADC081S021CISD |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-WSON | 6-WSON | 6-WSON | 6-WSON | 6-WSON | 6-WSON | 6-WSON |
| Resolution | 10 bits | 10 bits | 8 bits | 8 bits | 10 bits | 10 bits | 8 bits |
| Sample Rate (max) | 500 ksps | 500 ksps | 500 ksps | 500 ksps | 200 ksps | 200 ksps | 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 | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Reference | Internal | Internal | Internal | Internal | Internal | Internal | Internal |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| 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 | -40°C to +85°C |
Key Differentiators
- Highest-speed 10-bit SAR in the 6-WSON family (vs ADC101S021CISDX)
- 10-bit vs 8-bit alternative in same package (vs ADC081S051CISD)
- Internal reference removes external reference IC (vs External-reference SAR ADCs (e.g., MCP3001))
Design Notes
Place a 0.1 µF X7R ceramic bypass capacitor as close as possible to the VA pin (pin 1) with the trace to pin 2 (GND) kept short and direct. The internal reference and SAR core are sensitive to high-frequency supply ripple; even a few mV of digital switching noise on VA degrades INL/DNL and convets noise into the conversion result. For multi-ADC boards or noisy environments, add a ferrite bead in series with VA and a larger 1-10 µF bulk cap adjacent to the beads to form a PI filter.
Keep analog input traces short and guard them with a ground plane on the layer below. The IN pin is high-impedance during the sample window, so long traces add parasitic capacitance that distorts the sampled voltage. Route SCLK and DOUT away from the IN trace to avoid digital-to-analog coupling. If the analog input comes from a sensor more than a few mm away, buffer it with an op-amp such as the OPA369 or LMV358 to drive the ADC input cleanly without affecting the source.
Do not violate the SCLK maximum frequency (10 MHz per TI datasheet) at maximum sample rate; overspec the host MCU SPI peripheral or insert a divider. Driving SCLK above the limit causes incorrect conversion results because the SAR logic cannot finish a bit decision per clock. Likewise, do not run SCLK below 4 MHz - the part's first-cycle setup time requires the minimum SCLK frequency to complete one conversion in the documented cycle count. CS must toggle per conversion: drive CS low, clock 14-16 SCLK cycles, drive CS high again before the next sample window.
Compliance Information
RoHS-compliant per TI product documentation. Standard version is not AEC-Q100 qualified - choose automotive-grade equivalents if needed. /NOPB suffix confirmed lead-free per TI naming convention.
