ADC0834CCWMX - 8-Bit 4-Ch Serial I/O SAR ADC | Texas Instruments
MPN: ADC0834CCWMX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.91 | $9.91 |
| 10 | $8.93 | $89.30 |
| 100 | $7.45 | $745.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.25 | $5,250.00 |
ADC0834CCWMX Overview
A SAR (Successive Approximation Register) ADC is a class of data converter that performs a binary search through internal DAC and comparator hardware to resolve an analog input voltage into a digital code in a fixed number of clock cycles. SAR ADCs sit in the broader hierarchy of analog-to-digital conversion architectures, between flash converters (fastest, lowest accuracy) and integrating/sigma-delta converters (slowest, highest accuracy). Because SAR ADCs deliver deterministic latency and low latency (typically under 1 conversion cycle), they are commonly used in multiplexed data-acquisition, industrial process control, and embedded instrumentation where multiple channels must be sampled sequentially without a pipeline delay.
Key specifications include 8-bit resolution, a 4-input analog multiplexer (configurable as 2 differential pairs), serial I/O (compatible with TTL/MOS logic and SPI/QSPI/microwire-style controllers), a single +5V supply operation, and an on-chip shunt regulator that allows the device to operate with high-voltage supplies (via a current-limiting resistor on the V+ pin). The differential reference inputs (VREF+/VREF-) support ratiometric measurements, where the ADC output code scales directly with the reference amplitude. This makes the part well suited to bridge-sensor, thermistor-divider, and potentiometer-position measurements where the excitation source also serves as the reference.
Internally, the ADC0834 uses a charge-redistribution DAC and a CMOS comparator to perform successive approximation. The serial I/O port uses a 4-wire connection (CS, CLK, DI, DO) and includes a serial data output that can be chained to multiple ADCs for multi-channel expansion. The device offers a continuous-conversion mode in addition to single-shot conversion and provides a zero-scale/full-scale operating range that does not require external trimming.
Typical applications include portable data loggers, digital panel meters, remote data-acquisition front-ends, pen-tablet digitizers, process-control analog front-ends, and any 5V-system embedded design that needs to digitize 4 to 8 channels with low pin-count serial I/O.
When designing with this part, ensure that the analog inputs remain within the common-mode range of the reference and that decoupling (typically 0.1uF ceramic close to V+ and VREF) is provided. The shunt regulator pin (V+) requires a series resistor when operating from supplies above 6V. Take care not to exceed the absolute-maximum analog input voltage (VCC + 0.3V) to avoid latch-up. The serial clock rate must stay below the converter's maximum to preserve conversion accuracy.
This page synthesizes distributor pricing (as of 2026-10-12), drop-in package-compatible alternatives from TI's ADC083x family, and practical design notes that extend the information gain beyond the manufacturer datasheet alone.
Drop-in alternatives for ADC0834CCWMX — 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 ADC0834CCWMX (same form factor and footprint) — differing in Input Type, Package, RoHS Status, Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC0834CCWMX/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0834CCWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0838CIWM/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
ADC0831CCWM
✅ Drop-In✓ In Stock
$2.65 / Unit
View Datasheet →ADC0832CCWM/NOPB
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADC0834CCWMX Maximum Ratings & Electrical Characteristics
| Resolution | 8 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Analog Inputs | 4 single-ended / 2 differential (software-configurable) |
| Input Type | Single-ended or differential |
| Reference Type | Differential voltage reference (VREF+ / VREF-) |
| Operating Mode | Ratiometric or absolute (with external 5V reference) |
| Supply Voltage | 5 VDC nominal (4.5 V min, 6.0 V max without shunt regulator resistor) |
| Shunt Regulator | On-chip; supports operation with high-voltage supplies via series resistor on V+ |
| Digital Interface | Serial (CS, CLK, DI, DO) - TTL/MOS compatible |
| Conversion Type | Successive approximation |
| Output Coding | Straight binary (unipolar); no zero/full-scale adjust required |
| Package | 14-pin SOIC (WM), wide-body |
| Operating Temperature Range | -40 C to +85 C |
| RoHS Status | Compliant (NOPB suffix denotes lead-free / RoHS) |
| Mounting Type | Surface Mount |
ADC0834CCWMX Pin Configuration
| Pin 1 | CS — Chip Select (active-low). Enables serial I/O when low; tie low for continuous conversion mode. |
| Pin 2 | NC — Not connected (per datasheet). |
| Pin 3 | VIN0+ — Analog input channel 0, positive input (differential mode: positive input of CH0). |
| Pin 4 | VIN0- — Analog input channel 0, negative input (differential mode: negative input of CH0). |
| Pin 5 | VIN1+ — Analog input channel 1, positive input (differential mode: positive input of CH1). |
| Pin 6 | VIN1- — Analog input channel 1, negative input (differential mode: negative input of CH1). |
| Pin 7 | VREF- — Reference voltage negative input. Tie to AGND for ratiometric operation with single-ended inputs. |
| Pin 8 | VREF+ — Reference voltage positive input. Tie to VCC for ratiometric operation with 5V supply. |
| Pin 9 | AGND — Analog ground return. Connect to DGND at a single ground star point. |
| Pin 10 | CLK — Serial clock input. Driven by MCU SPI master SCLK; max rate per datasheet AC electricals. |
| Pin 11 | DO — Serial data output. Presents MSB-first conversion result on falling edges of CLK after CS goes low. |
| Pin 12 | DI — Serial data input. Receives MUX address bits and start-of-conversion command on rising edges of CLK. |
| Pin 13 | V+ — Positive supply for the analog front-end. Tie directly to VCC for 5V operation; add series resistor for shunt-regulator high-voltage operation. |
| Pin 14 | DGND — Digital ground return. Connect to AGND at a single ground star point. |
Typical Applications
ADC0834CCWMX is suitable for 6 applications: Multichannel Data-Acquisition Front-End, Industrial Process-Control Analog Input Module, Portable Battery-Powered Sensor Reading, Digital Panel Meter / Display Digitizer, Remote / Isolated Data-Acquisition Link, Pen-Tablet / Position-Sensing Digitizer.
Multichannel Data-Acquisition Front-End
The ADC0834CCWMX is a strong fit for multichannel data-acquisition front-ends because it integrates a 4-input analog multiplexer, a SAR conversion core, and a low-pin-count 4-wire serial interface in a single 14-pin SOIC. In a 4-channel thermocouple or thermistor digitizer, the 8-bit resolution (1 LSB = VREF/256) gives approximately 0.4 C resolution over a 0 to 100 C span when paired with a 5V reference, while the differential reference inputs allow ratiometric measurement that cancels excitation-supply drift. The serial port connects directly to an SPI master, eliminating the 8 parallel data lines a parallel-output ADC would need, which keeps microcontroller pin count low and PCB routing simple in compact embedded designs.
Recommended
Industrial Process-Control Analog Input Module
In a 4-20 mA loop monitor or PLC analog input module, the ADC0834CCWMX accepts four 0-5V or 0-10V process signals (after scaling and level-shifting) and converts them to 8-bit digital codes over the serial port. The on-chip shunt regulator allows the ADC to operate from a 24V industrial rail with a single series resistor on the V+ pin, simplifying power-supply design and saving a dedicated 5V LDO. With 8-bit resolution and conversion rates consistent with SAR architectures, this part covers monitoring-class process signals where accuracy below 0.5% is not required. Its -40 C to +85 C operating range and SOIC-14 package suit DIN-rail mounted controller boards.
Recommended
Portable Battery-Powered Sensor Reading
Battery-powered portable instruments benefit from the ADC0834CCWMX because the SAR architecture performs a single conversion in a deterministic number of clock cycles, allowing the MCU to power down the reference and the analog signal conditioning between conversions. The differential reference inputs support ratiometric reading of resistive-bridge sensors (load cells, strain gauges, pressure sensors), where the bridge supply doubles as VREF, automatically cancelling supply-voltage variation and temperature drift of the bridge excitation. The 4-channel MUX digitizes up to 4 sensor channels with a single ADC, reducing BOM cost and PCB area in handheld instruments.
Recommended
Digital Panel Meter / Display Digitizer
Digital panel meters and standalone display modules use the ADC0834CCWMX to digitize a single (or up to four) analog input signals and drive an LCD or LED display through a microcontroller. The 8-bit resolution provides 1 part in 256 precision, equivalent to a 3-digit DPM (e.g., 0.00 to 9.99 V displayed with 0.04 V steps), and the 4-wire serial port is easy to bit-bang from any MCU GPIO when no hardware SPI peripheral is available. The shunt regulator enables direct operation from the panel meter's 9V or 12V supply without a separate 5V rail, simplifying the BOM.
Recommended
Remote / Isolated Data-Acquisition Link
In a remote sensor node or isolated front-end where the ADC sits on the high-voltage or field side and the MCU sits on the logic side, the ADC0834CCWMX's 4-wire serial interface is advantageous because only 4 digital lines (CS, CLK, DI, DO) need to traverse the digital isolator, compared to 8+ lines for a parallel-output ADC. This minimizes the cost and complexity of the isolation barrier (e.g., a 4-channel digital isolator such as ISO7841 or a dual opto-isolator pair). The on-chip MUX eliminates an external analog mux, further reducing the isolated-side component count.
Recommended
Pen-Tablet / Position-Sensing Digitizer
The original TI ADC0834 family datasheet cites pen-tablet digitizers as a target application, where 4 single-ended or 2 differential analog inputs are read from the tablet's resistive overlay and converted to position coordinates. The differential reference inputs support ratiometric measurement of the resistive overlay, where the excitation sweep doubles as the ADC reference, cancelling supply and excitation drift. The 4-wire serial port keeps the active-pen electronics small, and the SOIC-14 package fits inside a slim pen-housing PCB.
Recommended
Recommended Products Summary
Engineering reference data for ADC0834CCWMX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC0834CCWMX/NOPB | ADC0834CCWM/NOPB | ADC0838CIWM/NOPB | ADC0831CCWM | ADC0832CCWM/NOPB |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-14 (WM) | SOIC-14 (WM) - same | SOIC-14 (WM) - same | SOIC-14 (WM) - same | SOIC-14 (WM) - same | SOIC-14 (WM) - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Analog Inputs (SE / DIFF) | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 4 SE / 2 DIFF | 8 SE / 4 DIFF | 1 SE / 1 DIFF | 2 SE / 1 DIFF |
| Digital Interface | Serial 4-wire (CS/CLK/DI/DO) | Serial 4-wire (same) | Serial 4-wire (same) | Serial 4-wire (same) | Serial 4-wire (same) | Serial 4-wire (same) |
| Supply Voltage | 5 V nominal (4.5 V to 6.0 V) | 5 V nominal | 5 V nominal | 5 V nominal | 5 V nominal | 5 V nominal |
| On-Chip Shunt Regulator | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40 C to +85 C (CC grade) | -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
- Integrated 4-channel analog multiplexer (vs ADC0804)
- Low-pin-count serial I/O (vs ADC0804)
- On-chip shunt regulator for high-voltage rails (vs Standalone ADC0804 (5V only))
Design Notes
The ADC0834CCWMX operates from a single +5V nominal supply on the V+ pin. When operating from a 5V rail, tie V+ directly to VCC. When operating from supplies above 6V, place a series resistor on the V+ pin to limit shunt-regulator current into the recommended operating range. Per the TI datasheet, VCC should be decoupled with a 0.1uF ceramic capacitor placed within 5 mm of the V+ pin to suppress digital switching transients from coupling into the analog conversion. For ratiometric measurements, derive VREF+ from the same 5V rail that excites the sensor bridge to make the conversion independent of supply variation.
Do not allow analog input voltages on the VIN pins to exceed VCC + 0.3V or fall below AGND - 0.3V; absolute-maximum violations on the analog inputs can induce CMOS latch-up that destroys the part. The CS pin must transition low before the first rising CLK edge; if CS is held low permanently the device enters continuous-conversion mode, which is correct for streaming applications but not for polled, low-power designs. The DI serial stream must contain a valid MUX address (start bit + SGL/DIF bit + select bits) before the start-of-conversion clock edge; sending an invalid or zero-length DI stream can leave the MUX in an undefined state and cause incorrect channel readings.
Keep the AGND and DGND pins joined at a single star-point ground near the AGND pin, and avoid running digital return currents under the analog input traces. Place the VREF decoupling capacitor (typically 0.1uF ceramic + 10uF tantalum) within 2 mm of the VREF+ pin; reference noise couples directly into the conversion result. Route the serial digital lines (CS, CLK, DI, DO) away from the analog input traces and consider adding a 10 kohm pull-up on the DO line if long traces are unavoidable, since DO is a CMOS push-pull output that can be over-driven by reflections on a long track.
Compliance Information
RoHS compliance indicated by /NOPB suffix; lead-free per TI datasheet ordering information. Not AEC-Q100 qualified (industrial/consumer grade). Conflict-minerals compliance per TI's standard CMRT declaration.
