ADC084S021CIMMX - 8-Bit 4-Ch 50-200ksps SAR ADC | Texas Instruments
MPN: ADC084S021CIMMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.62 | $26.20 |
| 100 | $2.18 | $218.00 |
| 500 | $1.85 | $925.00 |
| 1,000 | $1.6 | $1,600.00 |
ADC084S021CIMMX Overview
An SAR (Successive-Approximation Register) ADC is a type of analog-to-digital converter that uses a binary search algorithm through an internal DAC to converge on the input voltage in N clock cycles for an N-bit result. SAR ADCs sit hierarchically under the broader categories of data acquisition -> data converters -> mixed-signal ICs -> power management and signal chain semiconductors. They are favored for their deterministic latency, low power, and small package size compared to pipeline or sigma-delta converters, making them ideal for multiplexed multi-channel low-speed measurements.
Key features of the ADC084S021 include four single-ended analog inputs with an input voltage range of 0 V to V_A (the analog supply), 8-bit resolution with no missing codes, an integral nonlinearity (INL) of +/-0.2 LSB typical and +/-1 LSB maximum, and a signal-to-noise plus distortion (SINAD) figure above 49 dB. The serial interface operates up to 20 MHz at 5 V supply, and the part consumes only 1.7 mW at 200 ksps with a 3 V supply, dropping to microampere-level shutdown currents.
Technically, the ADC084S021 uses a charge-redistribution SAR DAC and an input sample-and-hold, achieving low aperture uncertainty and good common-mode rejection. The wide 2.7 V to 5.25 V supply range and SPI compatibility with virtually any microcontroller DSP or FPGA makes integration straightforward.
Typical applications include portable instrumentation, battery-powered sensor monitoring, process control loops, multichannel data loggers, and consumer audio/video equipment. Industrial temperature range of -40C to +85C ensures operation in factory and outdoor environments.
Designers should provide adequate decoupling on VA and VDR (digital reference) pins and route the analog inputs away from noisy digital traces; the SAR core offers deterministic conversion latency, so input multiplexing does not introduce timing jitter. For noise reduction, oversampling and averaging in firmware are recommended for high-precision measurements.
Drop-in alternatives for ADC084S021CIMMX — 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 ADC084S021CIMMX (same form factor and footprint) — differing in Package, Number of Channels, Resolution, Operating Temperature, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC084S021CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC084S021CIMM
✅ Drop-In✓ In Stock
$1.89 / Unit
View Datasheet →ADC084S021CIMMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC081S021CISD
✅ Drop-In✓ In Stock
$0.65 / Unit
View Datasheet →ADC081S051CISDX/NOPB
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADC081S051CISD
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ADC084S021CIMMX Maximum Ratings & Electrical Characteristics
| Manufacturer | Texas Instruments |
| Part Number | ADC084S021CIMMX |
| Resolution | 8 bit |
| Number of Channels | 4 (single-ended) |
| Sample Rate | 50 ksps to 200 ksps |
| Architecture | SAR |
| Input Voltage Range | 0 V to 5.25 V (0 to V_A) |
| Supply Voltage (Analog) | 2.7 V to 5.25 V |
| Supply Voltage (Digital) | 2.7 V to 5.25 V |
| Interface | SPI / QSPI / MICROWIRE compatible serial |
| Operating Temperature | -40C to +85C |
| Package | 10-VSSOP (MSOP-10) |
| Pins | 10 |
| Screening Level | Industrial |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
ADC084S021CIMMX Pin Configuration
| Pin 1 | VA — Analog supply voltage (2.7 V to 5.25 V) |
| Pin 2 | VREF — Reference voltage input (tied to VA typically) |
| Pin 3 | GND — Analog ground |
| Pin 4 | VIN0 — Analog input channel 0 (single-ended) |
| Pin 5 | VIN1 — Analog input channel 1 (single-ended) |
| Pin 6 | VIN2 — Analog input channel 2 (single-ended) |
| Pin 7 | VIN3 — Analog input channel 3 (single-ended) |
| Pin 8 | CS — Chip select (active low) for SPI interface |
| Pin 9 | SCLK — Serial clock input for SPI / QSPI / MICROWIRE |
| Pin 10 | DOUT — Serial data output (MOSI/MISO from ADC's perspective) |
Typical Applications
ADC084S021CIMMX is suitable for 6 applications: Portable Instrumentation, Battery-Powered Sensor Monitoring, Process Control Loops, Multi-Channel Data Loggers, Consumer Audio/Video Equipment, White Goods and Home Appliances.
Portable Instrumentation
The ADC084S021CIMMX suits portable instrumentation because it consumes only 1.7 mW at 200 ksps with a 3 V supply, supports 2.7-5.25 V analog supply (drop-in for Li-ion cells above 2.7 V), and provides 4 single-ended inputs to scan multiple sensor outputs. With 8-bit resolution and 50-200 ksps throughput, it delivers adequate fidelity for handheld thermometers, multimeters, and environmental loggers while extending battery life.
Recommended
Battery-Powered Sensor Monitoring
The ADC084S021CIMMX is well-suited for battery-powered wireless sensor nodes because its 1.7 mW power consumption at 200 ksps with a 3 V supply enables multi-year battery life when combined with duty-cycled wake/sleep conversion cycles. Its SAR architecture provides deterministic conversion latency with no pipeline delay, simplifying firmware timing for energy-harvested sensor sampling. The 4 single-ended inputs allow direct connection to thermocouple amplifiers, photodiodes, and bridge sensors through front-end conditioning.
Recommended
Process Control Loops
The ADC084S021CIMMX supports process-control feedback loops where 4 process variables (e.g., temperature, pressure, flow, level) must be sampled at modest rates (50-200 ksps aggregate). The 0 V to V_A input range aligns with 4-20 mA loop receivers when paired with a 250 ohm shunt or with 0-10 V industrial signals when scaled to V_A. The SAR architecture guarantees no missed interrupts because conversions are deterministic, an essential property for closed-loop digital control.
Recommended
Multi-Channel Data Loggers
The ADC084S021CIMMX is ideal for multi-channel data loggers that sequentially sample 4 analog channels and store readings to flash or SD card. With a maximum 200 ksps aggregate throughput (50 ksps per channel for 4-channel sequential scanning), it supports 4-channel 8-bit logging at rates sufficient for vibration, thermal, and acoustic monitoring. Its compact 10-VSSOP footprint fits on small logger PCBs alongside an MCU and microSD card holder.
Recommended
Consumer Audio/Video Equipment
The ADC084S021CIMMX fits consumer audio/video front-end monitoring where the SPI interface can be shared with a microcontroller managing display, audio, and communication subsystems. With 4 input channels it can monitor supply rails, audio levels, or user interface potentiometers. Its 2.7-5.25 V supply range aligns with USB-powered, battery-powered, and mains-powered consumer devices without requiring a separate analog regulator.
Recommended
White Goods and Home Appliances
The ADC084S021CIMMX suits white goods and home appliances that require 4-channel analog monitoring of temperature sensors (NTC thermistors), humidity sensors, and front-panel potentiometers. Its industrial -40C to +85C temperature range supports refrigerator, oven, dishwasher, and washing-machine environments. The 4 single-ended inputs allow direct sensor multiplexing, while the SPI interface connects to a low-cost microcontroller managing the user interface and motor control.
Recommended
Recommended Products Summary
Engineering reference data for ADC084S021CIMMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC084S021CIMM/NOPB | ADC084S021CIMM | ADC081S021CISD | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 10-VSSOP (MSOP-10) | 10-VSSOP (MSOP-10) - same | 10-VSSOP (MSOP-10) - same | 10-VSSOP - same | 10-VSSOP - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Channels | 4 (single-ended) | 4 | 4 | 1 | 1 |
| Sample Rate | 50 to 200 ksps | 50 to 200 ksps | 50 to 200 ksps | 50 to 200 ksps | 50 to 500 ksps |
| Analog Supply Range | 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 |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Pin/Package Compatibility | Reference | Drop-in (same VSSOP-10) | Drop-in (same VSSOP-10) | Drop-in (same VSSOP-10) | Drop-in (same VSSOP-10) |
Key Differentiators
- Four input channels in VSSOP-10 (vs ADC081S021CISD (single-channel VSSOP-10))
- Wide supply range 2.7 V to 5.25 V (vs ADC081S051CISDX/NOPB)
- Industrial -40C to +85C temperature range (vs ADC084S021CIMMX/NOPB)
Design Notes
Decouple VA (analog supply) and VREF (reference voltage input) pins with 0.1 uF ceramic capacitors placed as close to the IC pins as possible. Add a bulk 1-10 uF tantalum or ceramic capacitor at the supply origin. The ADC084S021 family is sensitive to analog supply ripple; if the same regulator feeds digital loads, use an LC pi-filter or separate LDO to keep ripple under 10 mV to preserve SINAD performance.
Route the analog input traces (VIN0-VIN3) as short as possible and away from noisy digital traces such as SCLK, DOUT, and CS. Use a continuous analog ground plane under the ADC and avoid splitting the ground plane between analog and digital sections. Place a 10 ohm ferrite bead or small resistor in series with the analog supply feed if the digital regulator switching noise is excessive.
The ADC084S021 input voltage range is 0 V to V_A - never apply negative voltages or voltages above V_A + 0.3 V to the analog inputs, as this can permanently damage the device. Ensure the CS line is held high (deasserted) when not in use to keep the part in shutdown; the chip only consumes full power when CS is pulled low and conversions are active.
The SCLK signal traces should be length-matched to within 1-2 cm to the DOUT trace to minimize timing skew and reflections. Place a small (22-33 ohm) series resistor at the SCLK driver if the bus is longer than 5 cm. Source-terminate DOUT if the receiving MCU is on a different PCB section; otherwise the default CMOS drive strength is sufficient for short traces on the same board.
When reading conversion results, ensure the SPI frame length matches the device's expected format - 16 SCLK cycles per conversion for the ADC084S021 family. Reading fewer than 16 clocks returns shifted bit patterns. The first 4 bits of the DOUT stream are zero-padded MSB alignment bits, then 12 bits of valid data (4 leading zeros, 8 result bits), and the trailing bits are zeros.
Compliance Information
RoHS compliant per TI product page; lead-free per the NOPB suffix variant ADC084S021CIMMX/NOPB. Not AEC-Q100 qualified - for automotive applications consider AEC-Q100 qualified SAR ADCs separately.
