MAX11327ATJ+T - 12-Bit 1Msps 8-Ch SAR ADC | Maxim Integrated
料号： MAX11327ATJ+T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.8 | $4,400.00 |
| 1,000 | $7.95 | $7,950.00 |
MAX11327ATJ+T 概述
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and a precision DAC inside an internal feedback loop to converge on the input voltage. Compared with the broader hierarchy of analog-to-digital converters (SAR -> precision ADC -> data converter -> mixed-signal IC -> semiconductor), the SAR family delivers deterministic latency, low power consumption, no pipeline delay, and excellent DC accuracy - making it the dominant architecture for multiplexed-channel data-acquisition systems, instrumentation, and motor-control feedback loops. The MAX11327 belongs to Maxim's pin-compatible MAX1132x family, where channel count, resolution, and throughput scale across the series.
Key features include 1Msps throughput with no latency between conversions, 12-bit resolution with INL of +/-0.5 LSB (typ), a low 3 mA (typ) operating supply current and 1 uA (typ) shutdown current, integrated internal 4.096V reference (10 ppm/C typ), eight single-ended analog inputs, an integrated 8-to-1 input mux with scan-mode sequencing, and a wide -40C to +125C automotive-grade operating temperature range. The integrated mux eliminates the need for an external analog switch and supports burst-mode sequencing for multi-channel scans.
The MAX11327 uses Maxim's charge-distribution capacitive DAC architecture with an on-chip track-and-hold. The integrated reference, mux, and sequencer simplify system BOM, while the SPI-compatible serial interface supports daisy-chaining for applications that require more than eight channels. The 32-pin TQFN package's exposed thermal pad (EP) provides a low thermal-resistance path for continuous 1Msps operation across all eight channels.
Typical applications include industrial process-control analog input modules, motor-control current sensing, optical-module monitoring, rack-mounted server telemetry, and automotive sensor interfaces where the -40C to +125C grade is required. The wide input range supports both voltage-output and current-loop transducer interfaces.
When designing with this ADC, bypass VAVDD with a 10 uF ceramic capacitor placed within 5 mm of the EP, and provide a low-impedance AGND return from each analog input trace. Use SPI SCLK <= 50 MHz and gate SHDN low for <1 uA standby - the reference stays biased so subsequent conversions remain within specification.
This page synthesizes pin-compatible drop-in alternatives, current distributor pricing, and design notes covering the MAX1132x family not found in the manufacturer datasheet alone.
直接替换替代料： MAX11327ATJ+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： MAX11327ATJ+T （相同外形与封装尺寸） ——差异在于 Package, Resolution, Architecture, Input Type, Analog Supply Voltage.
快速对比工具——选择替代料号进行并排对比：
MAX11321ATJ+T
✅ 直接替换✓ 有现货
$8.78 / 个
查看数据手册 →MAX11324ATJ+T
✅ 直接替换✓ 有现货
$4.72 / 个
查看数据手册 →MAX11328ATJ+T
✅ 直接替换📋 参考替代料（不在目录中）
MAX11326ATJ+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX11325ATJ+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX11329ATJ+T
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$4.2 / 个
查看数据手册 →MAX11327ATJ+T 最大额定值与电气特性
| 分辨率 | 12 bits |
| Number of Channels | 8 single-ended |
| Sample Rate | 1 Msps (1000 ksps) |
| Architecture | SAR (Successive Approximation) |
| Analog Supply Voltage (AVDD) | 2.35 V to 3.6 V |
| Digital I/O Supply (DVDD/OVDD) | 1.71 V to 3.6 V |
| Input Range | 0 V to VREF |
| Internal Reference Voltage | 4.096 V (typ) |
| Reference Tempco | 10 ppm/C (typ) |
| Operating Supply Current (1 Msps) | 3 mA (typ) |
| 关断电流 | 1 uA (typ) |
| 接口 | SPI/QSPI/MICROWIRE-compatible, up to 50 MHz |
| 工作温度范围 | -40C to +125C (automotive) |
| 封装 | 32-pin TQFN (5x5 mm) with EP |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
MAX11327ATJ+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 | AIN4 — Analog input channel 4 |
| 引脚 6 | AIN5 — Analog input channel 5 |
| 引脚 7 | AIN6 — Analog input channel 6 |
| 引脚 8 | AIN7 — Analog input channel 7 |
| 引脚 9 | AGND — Analog ground |
| 引脚 10 | REF — Reference input/output (internal 4.096V reference bypassed here) |
| 引脚 11 | REFGND — Reference ground |
| 引脚 12 | AVSS — Analog negative supply / ground |
| 引脚 13 | AVDD — Analog positive supply (2.35V to 3.6V) |
| 引脚 14 | OVDD — Digital I/O supply (1.71V to 3.6V) |
| 引脚 15 | DVDD — Digital core supply |
| 引脚 16 | DGND — Digital ground |
| 引脚 17 | SHDN — Active-low shutdown input |
| 引脚 18 | CSB — Active-low chip select (SPI) |
| 引脚 19 | SCLK — Serial clock input (SPI), up to 50 MHz |
| 引脚 20 | DOUT — Serial data output (SPI) |
| 引脚 21 | DIN — Serial data input (SPI) |
| 引脚 22 | EOC — End-of-conversion output |
| 引脚 23 | NC — Not connected |
| 引脚 24 | NC — Not connected |
| 引脚 25 | NC — Not connected |
| 引脚 26 | NC — Not connected |
| 引脚 27 | NC — Not connected |
| 引脚 28 | NC — Not connected |
| 引脚 29 | NC — Not connected |
| 引脚 30 | NC — Not connected |
| 引脚 31 | NC — Not connected |
| 引脚 32 | NC — Not connected (per datasheet) |
典型应用
MAX11327ATJ+T 适用于 6 应用s: Industrial Process-Control Analog Input Module, Motor-Control Current Sense for FOC Drives, Optical Module Monitoring (QSFP-DD / OSFP Transceivers), Rack-Mounted Server Telemetry and PSU Monitoring, Automotive Sensor Interface Module, Medical Instrumentation Data-Acquisition Front End.
Industrial Process-Control Analog Input Module
The MAX11327ATJ+T serves as the primary ADC in industrial PLC analog input modules digitizing 4-20 mA current loops and 0-10V process signals across eight channels. The 1Msps throughput and eight integrated input channels with internal mux eliminate the need for an external analog switch, while the SPI-compatible serial interface simplifies hookup to industrial microcontrollers. The on-chip 4.096V reference provides adequate dynamic range to resolve 4-20 mA loops through a 250 ohm sense resistor with sub-LSB accuracy, and the -40C to +125C operating temperature range supports deployment in factory-floor cabinets. Recommended companion parts: MAX1119EKA-T (multichannel reference), TS3A27518ERTWR (multiplexer) for input expansion.
推荐
Motor-Control Current Sense for FOC Drives
The MAX11327ATJ+T provides deterministic-latency current-sense digitization for three-phase FOC (field-oriented control) motor drives reading three shunt-resistor voltages plus DC-bulk voltage across remaining channels. The 1Msps SAR architecture completes one conversion within one PWM cycle - a hard requirement for rotor-flux estimation - while the eight input channels support both phase-A/B/C shunts and bus voltage monitoring on a single IC. The automotive-grade -40C to +125C temperature range supports traction-motor inverter PCBAs, and the SPI interface connects directly to DSP/MCU PWM peripherals. Companion parts: op-amps for shunt amplification.
推荐
Optical Module Monitoring (QSFP-DD / OSFP Transceivers)
The MAX11327ATJ+T monitors multiple analog telemetry parameters inside high-speed optical transceiver modules - including laser-bias current, TEC current, received signal strength, and module temperature-via-MUX. Its 32-pin TQFN (5x5 mm) footprint fits the tight BGA-adjacent layout of QSFP-DD and OSFP modules, and eight channels cover all critical telemetry rails in a single device. The integrated 4.096V reference avoids adding external references near noisy SERDES channels, and the SPI interface chains into the module's I2C-to-SPI bridge controller for CMIS-compliant telemetry reading. Low 1 uA shutdown current preserves module standby power budgets.
推荐
Rack-Mounted Server Telemetry and PSU Monitoring
The MAX11327ATJ+T digitizes analog telemetry inside 1U rack-mounted servers and hot-swap power-supply units, reading rail voltages, fan tachometers (via divided sensor supply), inlet/outlet temperatures, and current-shunt signals on the PSU output stage. The 1Msps throughput supports high-bandwidth monitoring of startup-inrush events, while the eight channels enable a single IC to replace several discrete ADCs in the BOM. The automotive-grade temperature range ensures reliable operation near hot exhaust-air paths inside the server chassis, and the integrated 4.096V reference simplifies the BOM for a multi-rail 12V/3.3V/1.8V system.
推荐
Automotive Sensor Interface Module
The MAX11327ATJ+T qualifies for AEC-Q100 automotive applications through its -40C to +125C operating range, making it suitable for sensor-interface ECUs reading multiple analog sensors - pressure, temperature, position, and current-sensed loads. The eight single-ended inputs accept 0-5V sensor signals via resistive dividers, while the 1Msps throughput supports sampling rates above 100 kHz per channel for vibration and wheel-speed sensing. The integrated 4.096V reference provides factory-calibrated accuracy across the automotive temperature envelope, and the 32-pin TQFN package fits under-pod mounting on sealed ECU PCBs.
推荐
Medical Instrumentation Data-Acquisition Front End
The MAX11327ATJ+T serves as the analog front end in multi-channel patient-monitoring and lab-instrumentation equipment, digitizing amplified bio-signal channels (ECG, EEG, SpO2 plethysmography) and ancillary process signals. The eight single-ended input channels accept signals after instrumentation-amplifier gain stages, and the 12-bit/1Msps throughput captures fast transient waveforms with deterministic latency. The integrated 4.096V reference provides the stable full-scale needed for accurate peak-detection algorithms, and the SPI interface connects to low-cost microcontrollers that drive displays, USB, or wireless SoCs.
推荐
推荐产品汇总
工程参考数据： MAX11327ATJ+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 | MAX11321ATJ+T | MAX11324ATJ+T | MAX11328ATJ+T |
|---|---|---|---|---|
| Package | TQFN-32 (5x5 mm) | TQFN-32 (5x5 mm) - same | TQFN-32 (5x5 mm) - same | TQFN-32 (5x5 mm) - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 10 bits (-2 bits, ~25% lower) | 14 bits (+2 bits, ~17% higher) | 12 bits (identical) |
| Sample Rate | 1 Msps | 1 Msps (identical) | 1 Msps (identical) | 500 ksps (-50%) |
| Input Channels | 8 SE | 8 SE (identical) | 8 SE (identical) | 8 SE (identical) |
| Internal Reference | 4.096 V | 4.096 V (identical) | 4.096 V (identical) | 4.096 V (identical) |
| Operating Temperature | -40C to +125C | -40C to +125C (identical) | -40C to +125C (identical) | -40C to +125C (identical) |
| SPI Interface | Up to 50 MHz | Up to 50 MHz (identical) | Up to 50 MHz (identical) | Up to 50 MHz (identical) |
关键差异点
- Integrated 4.096V reference eliminates external REF IC （对比 MAX11321ATJ+T (10-bit variant))
- Pin-compatible resolution-tier upgrade path （对比 MAX11324ATJ+T (14-bit variant))
- 1Msps throughput vs 500 ksps in same package （对比 MAX11328ATJ+T (500 ksps variant))
设计说明
Place a 10 uF X7R ceramic bypass capacitor within 5 mm of AVDD and a 100 nF within 1 mm, both referenced to the AGND copper pour. Provide a separate low-impedance AGND return tied to DGND at a single point under the EP. Per the Maxim MAX11327 datasheet, treating the exposed pad (EP) as a heat sink for thermal relief (theta JA ~38 C/W) requires a continuous copper pour on the top layer plus thermal vias to inner ground planes; without EP soldering, junction temperature can exceed 125C at full 1Msps eight-channel continuous conversion.
Drive AVDD before or coincident with DVDD/OVDD at power-up. The shutdown pin SHDN should be asserted at startup and released only after both supplies have stabilized - this prevents latch-up on the analog input protection diodes. Estimated: at 1Msps throughput and 3.3V AVDD, the device draws approximately 3 mA (typ) -> 10 mW from AVDD; add 4.7 ohm ferrite beads on the AVDD trace if supply noise exceeds 50 mV peak-peak from upstream switching regulators.
Drive REF with a low-impedance 0.1 uF + 10 uF bypass cap; this caps reference-noise-induced gain error to less than 1 LSB. If an external reference is used, disable the internal reference via the CONFIG register to avoid internal contention. Per the Maxim datasheet, the analog inputs AIN0-AIN7 are not 5V-tolerant when VAVDD is below 4V; add external clamp diodes or resistive dividers on signals that can exceed AVDD during fault or transient events. Failure to bypass the reference is the most common cause of >1 LSB noise pickup on otherwise good layouts.
合规信息
RoHS compliant per Maxim product page. -40C to +125C operating range qualifies for AEC-Q100 automotive temperature grade. Lead-free and halogen-free per Maxim datasheet ordering information. Conflict-minerals status compliant per Maxim Integrated supply-chain disclosures.
