ADC084S051CIMM - 8-Bit 4-Ch 500kSPS SAR ADC | Texas Instruments
MPN: ADC084S051CIMM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.36 | $236.00 |
| 500 | $2.13 | $1,065.00 |
| 1,000 | $1.89 | $1,890.00 |
ADC084S051CIMM Overview
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision data-conversion architecture that uses a binary search algorithm and an internal sample-and-hold capacitor to digitize an analog input. SAR ADCs sit between flash converters (fastest, lowest resolution) and delta-sigma converters (highest resolution, slower) in the data-converter taxonomy, and they are preferred when both deterministic latency and 8-16 bit resolution are required.
Key features of the ADC084S051 include a 2.7 V to 5.25 V single supply, four single-ended input channels multiplexed into one SAR core, and a 500 ksps aggregate sample rate. Power consumption is specified at 2.2 mW on a +3 V supply and 7.1 mW on a +5 V supply. The serial interface supports the standard SPI/QSPI/MICROWIRE modes, and the digital inputs are TTL-compatible, allowing direct connection to 3 V and 5 V microcontrollers without level shifters.
The internal architecture is based on a charge-redistribution SAR with an inherent sample-and-hold, an on-chip reference, and an external clock. Conversion latency is deterministic at roughly 16 SCLK cycles, which simplifies DSP firmware timing. The reference can be driven from the supply or a more accurate external source, and the analog inputs are sampled at the end of the conversion, enabling true simultaneous-sampling of multiple channels when used with an external analog mux.
Typical applications include portable data acquisition, multi-cell battery monitoring in industrial handhelds, sensor front-ends (temperature, pressure, strain-gauge bridges), process-control analog input modules, and consumer audio front-panel control. The wide 2.7 V-5.25 V supply range also suits 3.3 V MCU co-designs where rail noise and ground bounce are common.
When designing with this part, dedicate a clean linear regulator to the AVDD pin and place 1 uF plus 0.1 uF decoupling capacitors as close to the supply pins as possible. The VSSOP-10 thermal pad (where present on similar TI parts) is not used here, but the exposed lead frame still benefits from a small copper pour for mechanical reliability in hand-held assemblies.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not assembled in any single manufacturer datasheet.
Drop-in alternatives for ADC084S051CIMM — 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 ADC084S051CIMM (same form factor and footprint) — differing in Package, Digital Interface, Architecture, Number of Channels, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC084S051CIMM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC084S051CIMMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC084S021CIMMX
✅ Drop-In✓ In Stock
$1.6 / Unit
View Datasheet →ADC081S051CISDX/NOPB
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →ADC081S051CISD
✅ Drop-In✓ In Stock
$1.85 / Unit
View Datasheet →ADC081S021CISD
✅ Drop-In✓ In Stock
$0.65 / Unit
View Datasheet →ADC084S051CIMM Maximum Ratings & Electrical Characteristics
| Resolution | 8 bit |
| Number of Input Channels | 4 |
| Architecture | SAR (Successive Approximation Register) |
| Sample Rate Range | 200 ksps to 500 ksps |
| Input Type | Single-ended, 4 channels |
| Supply Voltage (AVDD, DVDD) | 2.7 V to 5.25 V (single supply) |
| Supply Current (typ @ 3V) | 0.73 mA (2.2 mW) |
| Supply Current (typ @ 5V) | 1.42 mA (7.1 mW) |
| Digital Interface | SPI, QSPI, MICROWIRE, DSP-compatible serial |
| Output Code Format | Straight binary |
| Reference Voltage | Supply-referenced (internal tap on AVDD) |
| Operating Temperature Range | -40 C to +85 C |
| Package | 10-pin VSSOP / MSOP |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant |
| Lead Finish | Matte Sn (lead-free) |
ADC084S051CIMM Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | GND — Ground |
| Pin 6 | SCLK — Serial clock input |
| Pin 7 | DOUT — Serial data output |
| Pin 8 | CS — Chip select (active low) |
| Pin 9 | DVDD — Digital supply voltage |
| Pin 10 | AVDD — Analog supply voltage |
Typical Applications
ADC084S051CIMM is suitable for 6 applications: Portable Multi-Channel Data Acquisition, Industrial Sensor Front-End, Battery Cell Monitoring, Consumer Audio Front-Panel Control, Process Control Analog Input Module, IoT Sensor Node Digitizer.
Portable Multi-Channel Data Acquisition
The ADC084S051CIMM's four single-ended input channels and 500 ksps aggregate throughput make it ideal for portable multi-channel data loggers, where 8-bit resolution is sufficient for capturing temperature, pressure, and strain-gauge signals. The wide 2.7 V-5.25 V supply range matches a single Li-ion cell or USB bus, and 2.2 mW power at 3 V preserves battery life. Place the ADC084S051CIMM behind a dedicated 3.3 V LDO to keep supply noise out of the conversion result, and use a 1 uF + 0.1 uF decoupling pair close to AVDD. The SPI/QSPI/MICROWIRE-compatible serial output connects directly to a Cortex-M0 or MSP430 MCU without level shifters.
Recommended
Industrial Sensor Front-End
In a 4-20 mA loop-powered or 24 V industrial sensor front-end, the ADC084S051CIMM provides four channels of 8-bit conversion at 500 ksps to digitize thermocouple, RTD bridge, and process-voltage signals. The industrial -40 C to +85 C operating range covers most factory-floor enclosures, and the VSSOP-10 footprint fits on compact PLC analog input modules. Pair the ADC084S051CIMM with an external low-drift 2.5 V reference and an instrumentation amplifier for best DC accuracy. The deterministic 16-SCLK conversion latency simplifies deterministic-loop PLC firmware timing.
Recommended
Battery Cell Monitoring
The ADC084S051CIMM is well suited to multi-cell battery monitoring in portable medical and industrial handhelds where each cell voltage is digitized for coulomb counting and protection. With four single-ended channels, the part can monitor a 4-cell Li-ion pack directly from a 3.3 V rail, and 7.1 mW typical power at 5 V minimizes parasitic drain. Place the ADC084S051CIMM near the battery connector, use a high-CMRR buffer to reject charger switching noise, and connect the SPI output to the main MCU through short traces. The wide supply tolerance simplifies direct connection to the pack voltage without a separate ADC LDO.
Recommended
Consumer Audio Front-Panel Control
In audio amplifiers, mixing consoles, and home-theater receivers, the ADC084S051CIMM digitizes four potentiometer or rotary-encoder channels for volume, balance, bass, and treble. The 8-bit resolution and 500 ksps sample rate are more than sufficient for human-interface knobs that update at 100 Hz. Connect each pot wiper to an AINx input, drive AVDD from a quiet 3.3 V LDO, and run the SPI lines to the main DSP or microcontroller. The straight-binary output format simplifies firmware debounce and mapping, and the VSSOP-10 footprint fits behind a 1U front panel.
Recommended
Process Control Analog Input Module
For a Programmable Logic Controller (PLC) analog input module, the ADC084S051CIMM offers four single-ended channels of 8-bit conversion in a compact 10-VSSOP package. The 500 ksps sample rate allows over-sampling for software averaging to improve effective resolution. Use a dedicated linear regulator to power AVDD, a low-pass RC anti-aliasing filter on each AINx, and an external 2.5 V reference for best DC accuracy. The SPI output is compatible with most PLC backplane MCUs, and the -40 C to +85 C industrial range covers most factory environments.
Recommended
IoT Sensor Node Digitizer
In a wireless IoT sensor node, the ADC084S051CIMM digitizes multiple analog sensor outputs (temperature, humidity, light, and gas) and reports them over SPI to a low-power wireless MCU. The 2.7-5.25 V supply range covers both 3.3 V SoCs and 5 V solar-panel rails, and the 2.2 mW typical power keeps total node consumption low. Use a 1 uF + 0.1 uF decoupling pair at the AVDD pin and short SPI traces to the MCU. The VSSOP-10 footprint fits inside a coin-cell sensor package, and the TTL-compatible digital inputs interface directly to a Wi-Fi or BLE SoC.
Recommended
Recommended Products Summary
Engineering reference data for ADC084S051CIMM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC084S051CIMM/NOPB | ADC084S051CIMMX/NOPB | ADC084S021CIMMX | ADC081S051CISDX/NOPB | ADC081S021CISD |
|---|---|---|---|---|---|---|
| Package | VSSOP-10 | VSSOP-10 - same | VSSOP-10 - same | VSSOP-10 - same | VSSOP-10 - same | VSSOP-10 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Channels | 4 | 4 | 4 | 4 | 1 | 1 |
| Max Sample Rate | 500 ksps | 500 ksps | 500 ksps | 200 ksps | 500 ksps | 200 ksps |
| Supply Voltage 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 | 2.7 V to 5.25 V |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| Lead-Free / RoHS | SnPb (older) / NOPB variant lead-free | Yes (NOPB = lead-free) | Yes (NOPB = lead-free) | Yes | Yes (NOPB = lead-free) | Yes |
Key Differentiators
- Four single-ended input channels in a 10-pin VSSOP (vs ADC081S051CISDX/NOPB)
- Wide 2.7 V to 5.25 V single supply (vs ADC084S021CIMMX (200 ksps))
- SPI / QSPI / MICROWIRE / DSP-compatible serial output (vs Parallel-output ADCs (e.g., ADC0808 family))
Design Notes
Use a dedicated low-noise linear regulator (such as a TPS7A20 or LP2985) to power the AVDD pin of the ADC084S051CIMM, even if the rest of the board is fed from a switching converter. Add a 1 uF X7R ceramic + 0.1 uF X7R ceramic decoupling pair within 5 mm of the AVDD pin, and a single 0.1 uF on DVDD. The TI datasheet explicitly recommends a dedicated linear regulator to keep digital switching noise out of the analog conversion. Estimated: a TPS7A20 at 200 mA dropout of 200 mV will dissipate roughly 60 mW when feeding a 3.3 V ADC at 2.2 mW.
Do not leave unused analog input channels floating - the ADC084S051CIMM has four single-ended channels, and any unused AINx should be tied to mid-supply (AVDD/2) through a 10 kohm resistor to prevent input bias current from creating conversion errors. Also ensure CS is held low for the full 16 SCLK cycles of a conversion, otherwise the data frame will be misaligned and the sample will be invalid. Many firmware bugs on this part are caused by CS being de-asserted one SCLK too early.
Route the SPI traces (SCLK, DOUT, CS) as a tight bus with a ground reference plane directly underneath, keeping trace lengths below 50 mm to avoid reflections on the 500 ksps / 16-SCLK conversion interface. Place the 0.1 uF decoupling capacitor for AVDD on the same side as the IC and within 3 mm of the pin. Do not run digital traces directly under the AIN0-AIN3 analog inputs - the capacitive coupling will inject digital switching noise into the analog signal path. A small copper pour tied to GND around the AINx traces further improves noise immunity.
Compliance Information
RoHS compliance is achieved by ordering the NOPB suffix variant. Standard ADC084S051CIMM (non-NOPB) is SnPb finish for legacy industrial use. AEC-Q100 is not applicable - choose an automotive-grade TI ADC for AEC-Q100 qualified designs.
