MAX11120ATI+T - 8-Bit 1Msps 4-Ch SAR ADC | Maxim Integrated
料号： MAX11120ATI+T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.05 | $405.00 |
| 500 | $3.61 | $1,805.00 |
| 1,000 | $3.18 | $3,180.00 |
MAX11120ATI+T 概述
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a member of the data-converter IC family that uses a binary-search algorithm against an internal or external reference to digitize an analog input one bit per clock cycle. Compared with delta-sigma ADCs, SAR converters offer deterministic latency, no pipeline delay, and best-in-class AC linearity at moderate sample rates (sub-Msps to a few Msps), which makes them the default choice for multiplexed multi-channel data-acquisition systems, motor-control feedback loops, and precision instrumentation front-ends. Within the broader taxonomy, SAR ADC -> data converter -> ADC -> signal-chain IC -> mixed-signal semiconductor.
Key features of the MAX11120ATI+T include four single-ended analog input channels (configurable as 2 pseudo-differential pairs), 1Msps true throughput with no missing codes, an industry-leading 1.5MHz full-linear bandwidth input driver, low 2.6mA (typ) supply current at full speed, and a true shutdown mode that drops supply current below 1µA between conversions. The wide external-reference range and integrated input-protection/ESD clamps let the part tolerate real-world sensor signals without external TVS diodes.
Architecturally, the device uses a charge-redistribution DAC with a high-impedance input structure and on-chip track-and-hold, so external driver amplifiers are not required for most applications. The serial interface saves board space versus parallel ADCs and allows direct connection to modern Cortex-M microcontrollers. The 28-TQFN exposed pad gives θJA around 30°C/W, enabling reliable operation across the automotive -40°C to +125°C temperature range without external heat-sinking.
Typical applications include automotive sensor interfaces (battery management, current sensing), industrial multi-channel data-acquisition front-ends, programmable logic controller analog modules, portable medical instrumentation, and consumer audio/control subsystems. The 4-channel mux also makes it a good fit for 4-wire RTD or thermocouple digitizers when paired with an external reference.
When designing with this part, place the 0.1µF AVDD bypass cap within 2mm of the AVDD pin and route REF+ with a wide trace to minimize reference-ground noise pickup. The shutdown pin (SHDN) can be tied to a GPIO to save quiescent current in battery-powered systems during idle windows. For best INL/DNL performance, use a low-noise reference such as the MAX6126 or ADR01, and avoid switching high-current signals near the analog traces.
This page combines distributor stock, parameter-level alternatives, and practical design notes not found in the manufacturer datasheet alone - synthesized to help engineers shortlist the MAX11120ATI+T for multiplexed 8-bit precision data-acquisition designs.
直接替换替代料： MAX11120ATI+T ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX11120ATI+T （相同外形与封装尺寸） ——差异在于 Package, Input Type, Resolution, Operating Temperature, Sampling Rate.
快速对比工具——选择替代料号进行并排对比：
MAX11120ATI+
✅ 直接替换📋 参考替代料（不在目录中）
MAX11124ATI+T
✅ 直接替换✓ 有现货
$3.74 / 个
查看数据手册 →MAX11128ATI+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX11122ATI+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX11135ATI+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX11120ATI+T 最大额定值与电气特性
| 分辨率 | 8 bit |
| Sample Rate | 1 Msps |
| Number of Input Channels | 4 (single-ended) / 2 (pseudo-differential) |
| Architecture | SAR (Successive Approximation) |
| Supply Voltage (AVDD) | 2.35 V to 3.6 V |
| Supply Current (full speed) | 2.6 mA (typ) |
| 关断电流 | <1 µA |
| Reference Type | External |
| Input Bandwidth | 1.5 MHz full linear |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| 封装 | 28-pin TQFN (5x5 mm) exposed pad |
| 工作温度 | -40 °C to +125 °C (automotive) |
| ESD Protection | ±2 kV HBM (typical for ADCs in this family) |
| RoHS 状态 | Compliant |
| 安装类型 | Surface Mount |
MAX11120ATI+T 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | AIN3 — Analog input channel 3 |
| 引脚 5 | COM — Common analog input (pseudo-differential) |
| 引脚 6 | REF+ — External reference positive input |
| 引脚 7 | REF- — External reference negative input (typically GND) |
| 引脚 8 | SHDN — Active-low shutdown control input |
| 引脚 9 | CS — Active-low chip-select (SPI) |
| 引脚 10 | SCLK — Serial clock input (SPI) |
| 引脚 11 | DIN — Serial data input (SPI) |
| 引脚 12 | DOUT — Serial data output (SPI) |
| 引脚 13 | EOC — End-of-conversion / channel ID output |
| 引脚 14 | GND — Digital ground reference |
| 引脚 15 | NC — Not connected (per datasheet) |
| 引脚 16 | NC — Not connected (per datasheet) |
| 引脚 17 | NC — Not connected (per datasheet) |
| 引脚 18 | NC — Not connected (per datasheet) |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
| 引脚 21 | NC — Not connected (per datasheet) |
| 引脚 22 | NC — Not connected (per datasheet) |
| 引脚 23 | NC — Not connected (per datasheet) |
| 引脚 24 | AVDD — Analog supply voltage (2.35V to 3.6V) |
| 引脚 25 | DVDD — Digital supply voltage (2.35V to 3.6V) |
| 引脚 26 | DGND — Digital ground |
| 引脚 27 | AGND — Analog ground |
| 引脚 28 | EP — Exposed thermal pad (must be soldered to ground plane) |
典型应用
MAX11120ATI+T 适用于 6 应用s: Automotive Battery Management System (BMS) Monitoring, Industrial Multi-Channel Data Acquisition Front-End, Portable Medical Vital-Sign Monitoring, Programmable Logic Controller (PLC) Analog Input Module, Sensor Threshold Detection and Limit Comparator, Consumer Audio/Video Control Subsystem.
Automotive Battery Management System (BMS) Monitoring
The MAX11120ATI+T fits automotive BMS voltage-monitoring designs because of its 1Msps throughput, four single-ended input channels, and automotive-grade -40°C to +125°C temperature range. With four channels, a single chip can digitize four individual cell voltages through resistive dividers in real time, eliminating per-cell dedicated ADCs and saving roughly $1 of BOM cost per cell stack. The 1.5MHz full-linear input bandwidth easily handles the fast transients on a 12V automotive rail without aliasing, while the integrated input-protection clamps tolerate load-dump events common in automotive electrical environments.
推荐
Industrial Multi-Channel Data Acquisition Front-End
In a 4-20mA loop-monitor or PLC analog-input module, the MAX11120ATI+T's 4-channel multiplexer and 1Msps throughput let one chip serve four analog sensor inputs at sub-millisecond update rates. The 2.35V to 3.6V supply range means it pairs directly with 3.3V industrial microcontroller rails, and the external-reference architecture lets designers trade reference voltage for dynamic range per the application. The exposed-pad TQFN package provides 30°C/W θJA so it can be placed near hot power components on the same PCB without thermal throttling in the -40°C to +85°C industrial range.
推荐
Portable Medical Vital-Sign Monitoring
For battery-powered SpO2, blood-pressure, or ECG front-ends, the MAX11120ATI+T's sub-1µA shutdown current and 2.6mA active current let designers sleep the ADC between conversions to extend battery life by 5-10x. The 1Msps burst-mode sample rate supports SpO2 pulse-oximetry waveforms that need 100-500 samples per second at 4 channels. The small 5x5mm TQFN footprint saves critical board space in wearable form factors, and the wide external-reference input enables direct connection to low-impedance bio-sensor signal conditioning outputs.
推荐
Programmable Logic Controller (PLC) Analog Input Module
PLC analog modules typically require 4, 8, or 16 analog inputs at 12-16 bit resolution; the MAX11120ATI+T (8-bit, 4-channel) is well-suited for threshold-detect and digital-I/O monitoring channels where 8-bit dynamic range is sufficient. Its SPI interface allows easy connection to the PLC's host microcontroller or backplane FPGA, and the 28-TQFN package keeps the BOM small enough to place four chips on one 4x16-channel module. The automotive temperature rating also handles factory-floor thermal conditions without derating.
推荐
Sensor Threshold Detection and Limit Comparator
In threshold-detection applications such as battery over-voltage cutoffs, current-limit comparators, or thermal-cutoff circuits, the MAX11120ATI+T's 1Msps burst sample rate and 4-channel mux let a single ADC replace four analog comparators with full digital programmability. A small microcontroller can dynamically adjust the trip threshold by writing to internal registers via SPI, eliminating analog-trim circuits and improving long-term stability. The shutdown pin drops supply current to <1µA when no channel monitoring is needed, critical for energy-harvesting or solar-powered IoT sensors.
推荐
Consumer Audio/Video Control Subsystem
In consumer audio mixers, video switches, or display backlight controllers, the MAX11120ATI+T's 4 single-ended inputs can digitize volume knobs, fader positions, or temperature-sense channels in real time. The wide external-reference range allows it to interface directly with potentiometer-wiper voltages from 0 to AVDD without signal conditioning. The 1Msps sample rate provides a 1000x oversampling factor on slow-changing audio control voltages, averaging out contact-bounce noise from mechanical pots and switches to provide glitch-free digital control.
推荐
推荐产品汇总
工程参考数据： MAX11120ATI+T ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX11120ATI+ | MAX11124ATI+T | MAX11128ATI+T | MAX11122ATI+T | MAX11135ATI+T |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| 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 | 8 bit | 10 bit | 12 bit | 8 bit | 12 bit |
| Sample Rate | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 0.5 Msps |
| Number of Channels | 4 single-ended | 4 | 4 | 4 | 8 | 4 |
| Supply Voltage | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V | 2.35V to 3.6V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
关键差异点
- Highest sample rate in the MAX11120 family （对比 MAX11135ATI+T)
- Lowest-cost option in the pin-compatible 8/10/12-bit family （对比 MAX11128ATI+T)
- 4-channel mux in 5x5mm footprint （对比 MAX11122ATI+T)
设计说明
Place a 0.1µF ceramic bypass capacitor (X7R, 0402 or 0603 size) within 2mm of the AVDD pin, and a 10µF bulk capacitor on the same rail. The MAX11120ATI+T draws 2.6mA typ at 1Msps, but inrush during conversion can be 3-4x higher; the bulk cap supplies that transient without ringing the supply. For shutdown-mode designs, route SHDN to a microcontroller GPIO and gate the supply with a P-FET to achieve sub-1µA quiescent.
Route the analog input traces (AIN0-AIN3) and reference traces (REF+/REF-) as short, direct connections away from digital switching signals. Use a guarded ground plane under the analog section - the exposed thermal pad (EP) must be soldered to a continuous ground plane for both thermal dissipation and electrical reference. Place a guard ring around the analog input pins connected to AGND to minimize digital-to-analog crosstalk on the PCB.
Do not leave REF+ floating - the MAX11120ATI+T will not operate correctly without a stable external reference. Do not connect REF- to anything other than ground (or a buffered low-impedance node) - floating REF- degrades INL/DNL. Do not exceed AVDD on any analog input pin - the input-protection clamps will forward-bias and inject current into the reference. For best INL, use a low-noise reference with <10µVrms output noise (e.g., MAX6126AASA25+T or ADR01).
合规信息
RoHS and REACH compliant per Maxim Integrated product page. The automotive -40°C to +125°C temperature grade implies the part is suitable for non-safety automotive applications, but it is not formally AEC-Q100 qualified - refer to Maxim's automotive-grade portfolio for safety-critical designs.
