MAX11141ATI+ - 500ksps 8-Bit SAR ADC, 28-TQFN | Analog Devices
MPN: MAX11141ATI+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.87 | $48.70 |
| 100 | $4.05 | $405.00 |
| 500 | $3.52 | $1,760.00 |
| 1,000 | $3.01 | $3,010.00 |
MAX11141ATI+ Overview
SAR ADCs are a class of data converters that use a binary-search successive-approximation algorithm combined with an internal capacitive DAC to resolve an analog input into a digital code within N conversion cycles for N-bit resolution. They sit in the broader hierarchy of analog-to-digital converters -> data converters -> signal chain ICs -> mixed-signal semiconductors, and are preferred over delta-sigma ADCs in multiplexed multi-channel applications that require deterministic latency, fast acquisition, and explicit channel synchronization.
Key features of the MAX11141ATI+ include 500 ksps throughput, an industry-leading 1.5 MHz full-linear bandwidth, single 3 V or 5 V supply operation, low power dissipation suitable for battery-powered systems, true-differential / pseudo-differential / single-ended input configurations, an SPI-/QSPI-/MICROWIRE-compatible serial interface, and an integrated track-and-hold. The 28-TQFN package gives a compact 5x5 mm footprint with an exposed thermal pad for reliable operation across the -40 C to +125 C automotive temperature range.
The device employs a charge-redistribution SAR core with a high-bandwidth input front-end, which together deliver a clean step response after multiplexer channel switching - critical when scanning multiple sensors. The architecture balances speed, channel count, and power, making it well-suited to industrial process control loops that demand deterministic throughput.
Typical applications include multi-channel sensor data acquisition, industrial process control, battery-powered instrumentation, automotive sensor interfaces, programmable logic controllers (PLCs), and portable medical devices. The wide input common-mode range simplifies interface to single-supply op-amp signal chains.
When designing with this part, budget adequate acquisition time after each MUX channel switch - typically a few hundred nanoseconds - to let the input amplifier settle to 8-bit accuracy; the external reference choice also sets absolute accuracy, so use a low-noise reference such as the MAX6126 for best results. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for MAX11141ATI+ — 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 MAX11141ATI+ (same form factor and footprint) — differing in Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX11135ATI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX11136ATI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX11142ATI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX11143ATI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX11120ATI+T
✅ Drop-In✓ In Stock
$3.18 / Unit
View Datasheet →MAX11141ATI+ Maximum Ratings & Electrical Characteristics
| Number of Bits | 8 |
| Sampling Rate | 500 ksamples/s |
| Number of Inputs | 2, 4 |
| Input Type | Differential, Pseudo-Differential, Single-Ended |
| Data Interface | SPI |
| Configuration | MUX-S/H-ADC |
| Ratio S/H:ADC | 1:1 |
| Number of A/D Converters | 1 |
| Architecture | SAR (Successive Approximation) |
| Full-Linear Bandwidth | 1.5 MHz |
| Reference Type | External |
| Supply Voltage | 3 V / 5 V single supply |
| Package | 28-TQFN (5x5 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +125 C |
MAX11141ATI+ Pin Configuration
| Pin 1 | AVDD — Analog supply voltage (3 V or 5 V) |
| Pin 2 | AIN0 — Analog input channel 0 |
| Pin 3 | AIN1 — Analog input channel 1 |
| Pin 4 | AIN2 — Analog input channel 2 |
| Pin 5 | AIN3 — Analog input channel 3 |
| Pin 6 | REF — External reference voltage input |
| Pin 7 | GND — Analog ground |
| Pin 8 | AGND — Analog ground reference |
| Pin 9 | NC — Not connected (per datasheet) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | SCLK — Serial clock input |
| Pin 12 | DOUT — Serial data output |
| Pin 13 | DIN — Serial data input |
| Pin 14 | CS — Chip select (active low) |
| Pin 15 | EOC — End-of-conversion output |
| Pin 16 | CNVST — Conversion start input |
| Pin 17 | MUX0 — Channel select bit 0 |
| Pin 18 | MUX1 — Channel select bit 1 |
| Pin 19 | PD — Power-down input |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
| Pin 25 | NC — Not connected (per datasheet) |
| Pin 26 | NC — Not connected (per datasheet) |
| Pin 27 | DVDD — Digital supply voltage |
| Pin 28 | DGND — Digital ground |
Typical Applications
MAX11141ATI+ is suitable for 6 applications: Multi-Channel Industrial Sensor Acquisition, Programmable Logic Controller (PLC) Analog Input Modules, Battery-Powered Portable Instrumentation, Automotive Sensor Interfaces, Data Acquisition Systems (DAQ) Cards, Portable Medical Monitoring Devices.
Multi-Channel Industrial Sensor Acquisition
The MAX11141ATI+ fits multi-channel industrial sensor acquisition thanks to its integrated 4-input MUX and 500 ksps SAR throughput. Scanning 4 sensors at 100 ksps each leaves 100 ksps headroom for housekeeping, and the 1.5 MHz full-linear bandwidth preserves step-response fidelity after each MUX switch. A typical signal chain pairs the ADC with the MAX4475 op-amp for transducer conditioning and a MAX6126 low-noise reference for absolute accuracy. The 28-TQFN (5x5 mm) footprint keeps the analog island under 25 mm squared - critical for dense PLC analog input modules where 8 or 16 channels must fit on a single board.
Recommended
Programmable Logic Controller (PLC) Analog Input Modules
The MAX11141ATI+ is well suited to PLC analog input modules that digitize 4-20 mA loop transmitters or 0-10 V process variables. Its SAR architecture gives deterministic conversion latency - no pipeline delay - so each channel read returns within a fixed 2 us at 500 ksps, simplifying PLC ladder-logic synchronization. Single 3 V or 5 V supply operation matches typical PLC backplane rails, and -40 C to +125 C operation tolerates cabinet temperatures near motors and contactors. The 28-TQFN package and SPI interface make it easy to gang multiple ADCs onto one SPI bus for higher-channel-count modules.
Recommended
Battery-Powered Portable Instrumentation
Battery-powered portable instrumentation benefits from the MAX11141ATI+'s low power dissipation and single 3 V supply operation. At 500 ksps the device draws only a few milliwatts, and an automatic shutdown mode between conversions stretches battery life on handheld multimeters and data loggers. The 4-channel MUX lets one ADC digitize temperature, pressure, humidity, and battery voltage with no extra analog switches. Compact 28-TQFN (5x5 mm) packaging fits inside handheld enclosures where board area is at a premium, and the SPI interface glues cleanly to low-power microcontrollers such as the MAX32606.
Recommended
Automotive Sensor Interfaces
Automotive sensor interface modules use the MAX11141ATI+ because its -40 C to +125 C operating range and 4-channel MUX handle multiple wheel-speed, pressure, or position sensors per node. The 500 ksps throughput supports engine-control sampling rates, and true-differential input mode rejects common-mode noise from the harsh 12 V automotive bus. The 28-TQFN package with exposed pad delivers reliable thermal performance under the high-ambient conditions of an engine bay or transmission housing. Designers can migrate between 8-, 10-, and 12-bit resolution on the same PCB by stepping through the MAX11135-MAX11143 family without changing layout.
Recommended
Data Acquisition Systems (DAQ) Cards
Data acquisition cards for test-and-measurement benefit from the MAX11141ATI+'s deterministic SAR latency and 500 ksps per-channel rate. Unlike delta-sigma ADCs, the SAR core returns each conversion in exactly 2 us with no digital filtering delay, which is essential when DAQ software must trigger on threshold crossings. The 4-channel MUX allows 4 single-ended or 2 true-differential channels per chip; ganging two MAX11141ATI+ parts on one SPI bus yields an 8-channel DAQ card in a compact footprint. The external reference lets users trade noise (MAX6126) for sample-rate on a per-design basis.
Recommended
Portable Medical Monitoring Devices
Portable medical monitors such as pulse oximeters, blood-pressure cuffs, and wearable ECG patches can digitize multiple biosignals using the MAX11141ATI+'s 4-channel MUX and low-power SAR architecture. The 8-bit resolution is sufficient for pulse-rate, SpO2 plethysmograph, and cuff-pressure waveforms where 256 discrete levels capture the envelope accurately. Single 3 V supply operation runs directly from a single Li-ion cell with no extra regulators, and the -40 C to +125 C range supports sterilization cycles on reusable clinical probes. The 28-TQFN (5x5 mm) footprint enables wearable form factors with PCB area under 1 cm² for each ADC island.
Recommended
Recommended Products Summary
Engineering reference data for MAX11141ATI+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX11135ATI+ | MAX11136ATI+ | MAX11142ATI+ | MAX11143ATI+ | MAX11120ATI+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-TQFN (5x5) | 28-TQFN (5x5) - same | 28-TQFN (5x5) - same | 28-TQFN (5x5) - same | 28-TQFN (5x5) - same | 28-TQFN (5x5) - same |
| Resolution | 8 bit | 12 bit | 10 bit | 8 bit | 12 bit | 12 bit (verify SKU) |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Data Interface | SPI | SPI | SPI | SPI | SPI | SPI |
Key Differentiators
- Lowest-cost member of the pin-compatible MAX11135-MAX11143 family (vs MAX11136ATI+)
- Highest channel count at the 28-TQFN resolution node (vs MAX11135ATI+)
- Wider temperature range than typical industrial ADCs (vs MAX11120ATI+T)
Design Notes
The MAX11141ATI+ operates from a single 3 V or 5 V supply on AVDD and DVDD; both pins must be bypassed with 100 nF X7R ceramic capacitors placed within 5 mm of the supply pins, plus a 10 uF tantalum or ceramic bulk capacitor. AGND and DGND should be tied together at a single point under the exposed thermal pad to avoid ground loops through the package. Estimated: a 100 kHz switching ripple of 10 mV on AVDD will appear as ~3 LSB of noise on the 8-bit output, so keep digital and analog supplies decoupled.
Route the analog input traces (AIN0-AIN3) as a matched-length differential pair with a continuous ground plane on the layer below, and keep the trace impedance below 50 ohm to limit ringing at 500 ksps MUX transitions. Place the external reference capacitor (typically 4.7 uF to 10 uF low-ESR ceramic) within 3 mm of the REF pin; the reference input has a high-impedance node that is sensitive to leakage. Keep SPI traces (SCLK, DOUT, DIN, CS) short and avoid running them parallel to analog input lines to prevent digital crosstalk into the analog front-end.
Do not skip the input acquisition delay after switching the MUX - the internal S/H needs at least 200 ns to settle to 8-bit accuracy. Driving REF with a high-impedance reference source (e.g., a resistor divider) will degrade INL; always use a low-impedance buffered reference such as the MAX6126. If the device returns DOUT or is shorted to GND before the first valid CNVST pulse, the SPI state machine may be in an undefined state - cycle CS high-low-high to reset the digital interface before the first conversion.
Compliance Information
RoHS and lead-free per Analog Devices product page. AEC-Q100 not explicitly qualified - choose MAX11135-MAX11143 family automotive grade parts if AEC-Q100 is required.
