MAX11327ATJ+T - 12-Bit 1Msps 8-Ch SAR ADC | Maxim Integrated
MPN: MAX11327ATJ+T ✓ Hoạt độngMAX11327ATJ+T Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX11327ATJ+T — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX11327ATJ+T (cùng hình factor và footprint) — khác nhau ở Package, Resolution, Architecture, Input Type, Analog Supply Voltage.
MAX11321ATJ+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX11324ATJ+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX11328ATJ+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX11326ATJ+T
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX11325ATJ+T
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX11329ATJ+T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX11327ATJ+T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Điện áp tắt | 1 uA (typ) |
| Giao diện | SPI/QSPI/MICROWIRE-compatible, up to 50 MHz |
| Khoảng nhiệt độ hoạt động | -40C to +125C (automotive) |
| Hộp | 32-pin TQFN (5x5 mm) with EP |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân MAX11327ATJ+T
| Chân 1 | AIN0 — Analog input channel 0 |
| Chân 2 | AIN1 — Analog input channel 1 |
| Chân 3 | AIN2 — Analog input channel 2 |
| Chân 4 | AIN3 — Analog input channel 3 |
| Chân 5 | AIN4 — Analog input channel 4 |
| Chân 6 | AIN5 — Analog input channel 5 |
| Chân 7 | AIN6 — Analog input channel 6 |
| Chân 8 | AIN7 — Analog input channel 7 |
| Chân 9 | AGND — Analog ground |
| Chân 10 | REF — Reference input/output (internal 4.096V reference bypassed here) |
| Chân 11 | REFGND — Reference ground |
| Chân 12 | AVSS — Analog negative supply / ground |
| Chân 13 | AVDD — Analog positive supply (2.35V to 3.6V) |
| Chân 14 | OVDD — Digital I/O supply (1.71V to 3.6V) |
| Chân 15 | DVDD — Digital core supply |
| Chân 16 | DGND — Digital ground |
| Chân 17 | SHDN — Active-low shutdown input |
| Chân 18 | CSB — Active-low chip select (SPI) |
| Chân 19 | SCLK — Serial clock input (SPI), up to 50 MHz |
| Chân 20 | DOUT — Serial data output (SPI) |
| Chân 21 | DIN — Serial data input (SPI) |
| Chân 22 | EOC — End-of-conversion output |
| Chân 23 | NC — Not connected |
| Chân 24 | NC — Not connected |
| Chân 25 | NC — Not connected |
| Chân 26 | NC — Not connected |
| Chân 27 | NC — Not connected |
| Chân 28 | NC — Not connected |
| Chân 29 | NC — Not connected |
| Chân 30 | NC — Not connected |
| Chân 31 | NC — Not connected |
| Chân 32 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX11327ATJ+T phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX11327ATJ+T — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Integrated 4.096V reference eliminates external REF IC (vsMAX11321ATJ+T (10-bit variant))
- Pin-compatible resolution-tier upgrade path (vsMAX11324ATJ+T (14-bit variant))
- 1Msps throughput vs 500 ksps in same package (vsMAX11328ATJ+T (500 ksps variant))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
