MAX11128ATI+TG3U - 1Msps 12-Bit 16-Ch SAR ADC | Maxim Integrated
MPN: MAX11128ATI+TG3U ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.1 | $71.00 |
| 100 | $6.05 | $605.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.55 | $4,550.00 |
MAX11128ATI+TG3U Overview
A SAR ADC is a type of data converter that performs a binary search through an internal capacitor array to digitize an analog input in a single conversion cycle, combining deterministic latency, no-pipeline-delay sampling, and inherent anti-alias robustness. SAR converters occupy the middle layer of the data-converter hierarchy (SAR ADC -> ADC -> data converter -> mixed-signal IC) and are the preferred topology for multiplexed multi-channel data-acquisition front ends, motor control loops, and instrumentation where settling time and channel-to-channel skew must be tightly controlled.
Key features of the MAX11128ATI+TG3U include 16 single-ended input channels with integrated channel-scanning in both internal and external clock modes, a high-speed SPI/QSPI/MICROWIRE-compatible serial interface, true 12-bit no-missing-codes performance with an external reference, and a hardware-/software-configurable shutdown mode that drops quiescent current for battery-powered duty-cycled measurements. The 28-TQFN package provides a compact 5mm x 5mm footprint suitable for dense PCB layouts.
The device is built on a low-leakage CMOS process optimized for sample-and-hold linearity. Internal sequencing logic automatically advances the channel pointer in scan mode, offloading firmware housekeeping from the host MCU. The wide analog input common-mode range and integrated input protection make the part tolerant of the overdrive conditions commonly seen in industrial multiplexing.
Typical applications include multi-channel data-acquisition systems, industrial process sensors and 4-20mA loop readback, motor control phase current monitoring, medical patient-monitoring front ends, and portable battery-powered instrumentation. The wide 2.35V-3.6V supply range and low power also fit solar-powered remote telemetry units.
Designers should budget analog-input RC settling time against the throughput clock, place a 0.1uF ceramic bypass capacitor adjacent to every supply pin, and ensure the external reference is rated for the desired noise and drift performance.
This page consolidates distributor pricing, drop-in alternatives from the same MAX11120-MAX11128 family, and practical design guidance that goes beyond the manufacturer's datasheet to help engineers select and qualify the part quickly.
Drop-in alternatives for MAX11128ATI+TG3U — 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 MAX11128ATI+TG3U (same form factor and footprint) — differing in Architecture, Number of Input Channels, Package, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX11128ATI+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX11120ATI+T
✅ Drop-In✓ In Stock
$3.18 / Unit
View Datasheet →MAX11128ATI+TG3U Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Number of Input Channels | 16 single-ended |
| Sampling Rate | 1 Msps |
| Supply Voltage | 2.35 V to 3.6 V |
| Power Consumption at 1 Msps | 5.4 mW |
| Input Bandwidth (full linear) | 1.5 MHz |
| Architecture | SAR (Successive Approximation Register) |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Reference | External |
| Output Code Format | Offset Binary |
| Package | 28-TQFN (5 mm x 5 mm) |
| Operating Temperature Range | -40 C to +125 C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Input Clock Modes | Internal and external |
| Scan Mode | Yes, automatic channel sequencing |
MAX11128ATI+TG3U 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 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AIN8 — Analog input channel 8 |
| Pin 10 | AIN9 — Analog input channel 9 |
| Pin 11 | AIN10 — Analog input channel 10 |
| Pin 12 | AIN11 — Analog input channel 11 |
| Pin 13 | AIN12 — Analog input channel 12 |
| Pin 14 | AIN13 — Analog input channel 13 |
| Pin 15 | AIN14 — Analog input channel 14 |
| Pin 16 | AIN15 — Analog input channel 15 |
| Pin 17 | REF — External reference input |
| Pin 18 | GND — Ground |
| Pin 19 | VDD — Analog supply voltage |
| Pin 20 | CNVST — Convert start input |
| Pin 21 | EOC — End of conversion output |
| Pin 22 | DOUT — Serial data output |
| Pin 23 | DIN — Serial data input |
| Pin 24 | SCLK — Serial clock input |
| Pin 25 | CS — Chip select (active low) |
| Pin 26 | SHDN — Shutdown input (active low) |
| Pin 27 | OVDD — Digital I/O supply |
| Pin 28 | OGND — Digital ground |
Typical Applications
MAX11128ATI+TG3U is suitable for 6 applications: Multi-Channel Data Acquisition Systems, Industrial Process Sensor Monitoring, Motor Control Phase Current Monitoring, Medical Patient Monitoring Front Ends, Portable Battery-Powered Instrumentation, Solar-Powered Remote Telemetry.
Multi-Channel Data Acquisition Systems
The MAX11128ATI+TG3U's 16 single-ended inputs, automatic scan-mode sequencing, and 1Msps throughput make it ideal for multi-channel data-acquisition (DAQ) front ends that digitize thermocouples, RTDs, strain gauges, and pressure transducers through a multiplexer. Its 1.5 MHz full-linear input bandwidth preserves signal integrity even when channels switch rapidly between sources with different DC biases, while the external reference pin accepts a low-drift reference such as the MAX6126 to hold absolute accuracy over temperature. Compared to a single-channel pipeline ADC, the integrated channel sequencer offloads firmware overhead from the host MCU, simplifying deterministic sample timing in industrial DAQ modules.
Recommended
Industrial Process Sensor Monitoring
Industrial 4-20mA loop, voltage, and bridge sensor readback often requires more than 8 channels and 12-bit resolution at modest sample rates. The MAX11128ATI+TG3U fits these panels with 16 inputs, 2.35V-3.6V supply compatible with 3.3V PLC backplanes, and 5.4 mW typical dissipation that simplifies EN 61010- and IEC 61131-compliant isolation barrier design. Its wide -40C to +125C operating range tolerates factory-floor temperatures and its SPI interface easily bridges to isolation barriers such as digital isolators from the same manufacturer family, allowing distributed sensor acquisition nodes over a single serial link.
Recommended
Motor Control Phase Current Monitoring
Field-oriented control of three-phase BLDC or PMSM motors requires simultaneous sampling of two or three phase currents plus DC-bus voltage and temperature - well within the 16-channel headroom of the MAX11128ATI+TG3U. The 1Msps throughput and deterministic SAR latency let the control loop digitize current-sense amplifier outputs with sub-microsecond delay, supporting high-PWM-frequency FOC algorithms. The wide analog input common-mode range accepts current-shunt amplifier outputs riding on the high-side of the half-bridge, while the small 5 mm x 5 mm TQFN footprint fits tightly on the inverter board next to the gate drivers.
Recommended
Medical Patient Monitoring Front Ends
Portable patient monitors acquire multi-lead ECG, SpO2, respiration, and bioimpedance channels simultaneously, demanding low power, deterministic sampling, and small footprint. The MAX11128ATI+TG3U delivers 1Msps 12-bit resolution across 16 channels while consuming only 5.4 mW from a 3.3V rail, extending battery life in wearable or handheld designs. Its shutdown mode drops quiescent current between samples, and the SPI interface is compatible with low-power Cortex-M host MCUs. The 5x5 mm TQFN occupies minimal PCB area, leaving room for analog front-end instrumentation amplifiers in this compact design.
Recommended
Portable Battery-Powered Instrumentation
Handheld multimeters, field data loggers, and portable gas detectors rely on multi-channel low-power ADCs to digitize sensor arrays without draining the battery. The MAX11128ATI+TG3U draws 5.4 mW at 1 Msps from a 2.35V-3.6V rail, accepts direct Li-ion / 2xAA / USB-derived supplies, and shuts down to microamp-level quiescent current between conversions. Sixteen channels are sufficient for combined voltage, current, temperature, and humidity measurements in one compact converter, and the 28-TQFN footprint simplifies layout in sealed handheld enclosures.
Recommended
Solar-Powered Remote Telemetry
Remote telemetry for solar-powered weather stations, environmental sensors, and asset trackers must digitize multiple analog inputs while drawing minimal average current. The MAX11128ATI+TG3U's shutdown mode enables duty-cycled sampling - the device wakes, performs one or several conversions, and returns to microamp quiescent - allowing the system to operate from small solar cells with energy harvesting budgets under 50 mW continuous. The wide operating temperature range and small TQFN footprint are well matched to outdoor NEMA-rated sensor enclosures, and the SPI interface is easily extended over RS-485 or LoRaWAN bridges.
Recommended
Recommended Products Summary
Engineering reference data for MAX11128ATI+TG3U — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX11128ATI+ | MAX11120ATI+T |
|---|---|---|---|
| Package | 28-TQFN (5x5) | 28-TQFN (5x5) - same | 28-TQFN (5x5) - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 1 Msps | 1 Msps | 1 Msps |
| Input Channels | 16 single-ended | 16 single-ended | 12 single-ended |
| Supply Voltage | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V |
| Input Bandwidth | 1.5 MHz | 1.5 MHz | 1.5 MHz |
| Reference Type | External | External | External |
Key Differentiators
- 16 single-ended channels with integrated scan-mode sequencing (vs MAX11120ATI+T)
- Industry-leading 1.5 MHz full-linear input bandwidth (vs Generic 1 Msps 12-bit SAR ADC)
- Low 5.4 mW power consumption at full throughput (vs Pipeline ADC at 1 Msps)
Design Notes
Estimated: at VDD = 3.3V and 1 Msps continuous sampling the MAX11128ATI+TG3U draws ~1.6 mA (5.4 mW) per the datasheet. In duty-cycled designs, leverage the SHDN pin to drop quiescent current between conversions - wake, perform one conversion, return to shutdown - to stretch battery life in portable instrumentation. Place a 10uF bulk plus a 0.1uF ceramic bypass adjacent to the VDD and OVDD pins.
The external reference drives full-scale accuracy and noise. A noisy or drifting reference will degrade 12-bit no-missing-codes performance regardless of ADC quality - choose a low-noise, low-drift reference such as the MAX6126 and add 0.1uF + 10uF decoupling at the REF pin. Avoid driving the reference with high-impedance sources; the REF pin expects a low-impedance buffer.
The 28-TQFN package exposes a thermal pad on the underside that must be soldered to a continuous ground copper pour for thermal dissipation and electrical reference. Route analog inputs and digital SPI traces on separate layers with a ground plane in between to minimize digital-to-analog coupling, and keep the analog input traces short and guarded to reduce crosstalk between the 16 input channels.
Compliance Information
RoHS and lead-free status per Maxim Integrated product page. Halogen-free status not stated in the available web data; AEC-Q100 not applicable for this consumer/industrial-grade ADC variant.
