MAX1231AEEG+T - 12-Bit 300ksps ADC, FIFO, Temp Sensor, SSOP-24 | Maxim
MPN: MAX1231AEEG+T ✓ Hoạt độngMAX1231AEEG+T Tóm tắt
What is a successive-approximation ADC? A SAR ADC is a type of analog-to-digital converter that uses a binary-search algorithm and a precision DAC to convert an analog input to a digital code one bit at a time per clock cycle. SAR ADCs sit in the converter hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor. They are favored over delta-sigma converters where low latency, deterministic sampling, and high absolute accuracy at moderate resolutions (10-16 bit) are required, such as in industrial process control and sensor monitoring.
Key features include 12-bit resolution with no missing codes, ±1 LSB INL (max), an analog multiplexer supporting 8 single-ended or 4 pseudo-differential inputs (channel count varies by family member: MAX1227 has 8, MAX1229 has 12, MAX1231 has 16), SPI/QSPI/MICROWIRE-compatible serial interface, and a hardware shutdown mode that drops supply current to under 1 µA. The 16-entry FIFO reduces host MCU overhead by allowing block reads of multiple conversions.
The MAX1231AEEG+T uses a capacitive charge-redistribution DAC with a precision bandgap reference and an integrated temperature sensor routed through the analog mux, eliminating the need for an external temp-sensing IC. The architecture achieves 300 ksps throughput while consuming only 2.7 mA (typ) active and 1 µA shutdown, making it appropriate for both high-speed data acquisition and power-conscious portable designs.
Typical applications include industrial process control, multichannel data acquisition systems, patient monitoring and portable medical instrumentation, factory automation sensor panels, and thermocouple/RTD temperature compensation. Designers choose the MAX1231AEEG+T when they need a complete, calibrated 12-bit acquisition front end with embedded temperature sensing in a small SSOP footprint.
When designing with this part, place the 0.1 µF supply bypass capacitors within 5 mm of AVDD and DVDD, and route REF+ to AVDD via a short trace to preserve reference accuracy. Do not exceed the absolute maximum AVDD of 4.2 V or apply analog inputs above AVDD + 0.3 V, as the input ESD structure is not tolerant of over-range.
This page synthesizes distributor pricing, drop-in alternatives sourced from the Maxim part family, and practical design notes that are not collated in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX1231AEEG+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 MAX1231AEEG+T (cùng hình factor và footprint) — khác nhau ở Internal Reference Voltage, Number of Input Channels, Operating Temperature Range, Resolution, Architecture.
MAX1231ACEG+T
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1231AEEG
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1231AEEG-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1231BCEG+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1231BEEG+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1231AEEG+T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Sample Rate | 300 ksps |
| Number of Input Channels | 16 single-ended / 8 pseudo-differential |
| Architecture | SAR (Successive Approximation) |
| Analog Supply Voltage (AVDD) | +3.0 V to +3.6 V |
| Digital Supply Voltage (DVDD) | +1.7 V to +3.6 V |
| Internal Reference Voltage | +4.096 V |
| Integral Nonlinearity (INL) | ±1 LSB (max) |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Hộp | 24-pin SSOP (QSOP variant) |
| Kiểu lắp đặt | Surface Mount |
| FIFO Buffer | 16 entries |
| Internal Temperature Sensor Accuracy | ±1 °C |
| Serial Interface | SPI / QSPI / MICROWIRE compatible |
| Active Supply Current | 2.7 mA (typ at 300 ksps) |
| Điện áp tắt | <1 µA |
| Trạng thái RoHS | Compliant |
Cấu hình chân MAX1231AEEG+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 | GND — Ground |
| Chân 10 | AIN8 — Analog input channel 8 |
| Chân 11 | AIN9 — Analog input channel 9 |
| Chân 12 | AIN10 — Analog input channel 10 |
| Chân 13 | AIN11 — Analog input channel 11 |
| Chân 14 | AIN12 — Analog input channel 12 |
| Chân 15 | AIN13 — Analog input channel 13 |
| Chân 16 | AIN14/AIN_TEMP — Analog input channel 14 / internal temperature sensor |
| Chân 17 | AIN15 — Analog input channel 15 |
| Chân 18 | REF — Internal reference decoupling node (4.096 V) |
| Chân 19 | SCLK — Serial clock input (SPI/QSPI/MICROWIRE) |
| Chân 20 | DOUT — Serial data output |
| Chân 21 | DIN — Serial data input |
| Chân 22 | CS — Active-low chip select |
| Chân 23 | GND — Ground |
| Chân 24 | AVDD — Analog supply (+3.0 V to +3.6 V) |
Ứng dụng tiêu biểu
MAX1231AEEG+T phù hợp cho 6 Áp dụngs: Industrial Process Control & PLC Sensor Front End, Multichannel Data Acquisition Systems (DAQ), Portable Medical & Patient Monitoring Instrumentation, Factory Automation & Distributed Sensor Panels, Thermocouple & RTD Temperature Compensation Systems, Battery-Powered Wireless Sensor Hubs.
Industrial Process Control & PLC Sensor Front End
The MAX1231AEEG+T is a strong fit for industrial process-control front ends because its 16 single-ended / 8 pseudo-differential analog inputs allow direct connection of multiple 4-20 mA loop, 0-10 V, and thermocouple-conditioned signals through scaling amplifiers. With 12-bit resolution and 300 ksps throughput, it can digitize the full analog panel scan inside one SPI transaction using the 16-entry FIFO, eliminating host timing overhead in PLC and DCS cards. The internal 4.096 V reference gives a 1 mV/LSB scale, while the ±1°C temperature sensor on channel 15 reports cold-junction compensation data for thermocouple inputs. Industrial grade -40°C to +85°C operation tolerates cabinet-internal heat and outdoor panel environments.
Được đề xuất
Multichannel Data Acquisition Systems (DAQ)
For bench and rack-mount data acquisition systems the MAX1231AEEG+T offers 300 ksps conversion at full 12-bit accuracy with no missing codes, suiting per-channel waveform sampling at rates up to 100 kHz. Its 16-channel mux reduces the analog-input footprint versus discrete ADC solutions, and the 16-entry FIFO lets the host controller service scans in batches, simplifying USB or Ethernet DAQ firmware. The hardware shutdown mode (<1 µA) supports battery-powered portable loggers, while the internal reference eliminates reference-calibration routines. Use a MAX1165AEUI+T as a parallel companion for sampling-rate-sensitive channels when simultaneous sampling is required.
Được đề xuất
Portable Medical & Patient Monitoring Instrumentation
Portable patient monitors and bedside diagnostic instruments benefit from the MAX1231AEEG+T's low 2.7 mA active supply current and sub-1 µA shutdown mode, extending battery life during continuous SpO2, ECG, and temperature monitoring. The 16 inputs can be routed to ECG leads, SpO2 current-sense amplifiers, thermistor bridges, and respiration impedance channels. The internal ±1°C temperature sensor gives disposable thermistor calibration offsets for body-temperature channels, removing the need for a separate thermistor IC. The 12-bit resolution is sufficient for vital-sign amplitude quantization where 4-5 µV/LSB sensitivity is acceptable; choose the MAX1162ACUB+T for higher-resolution companion channels.
Được đề xuất
Factory Automation & Distributed Sensor Panels
Factory automation panels that aggregate vibration, pressure, and proximity sensors can use a single MAX1231AEEG+T per panel, sampling 16 conditioned sensor channels at 300 ksps aggregate. The FIFO allows the PLC to poll panel data in batches, reducing EtherCAT or PROFINET cycle jitter. The industrial -40°C to +85°C grade tolerates cabinet heat and outdoor panel temperatures. The 3.0-3.6 V AVDD range integrates directly with 3.3 V factory sensor backplanes, while the 1.7-3.6 V DVDD range allows MCU-direct SPI interconnect without level shifters, simplifying panel BOM.
Được đề xuất
Thermocouple & RTD Temperature Compensation Systems
The MAX1231AEEG+T's internal ±1°C temperature sensor, accessible through the analog multiplexer, provides cold-junction compensation data for thermocouple measurements without requiring an external thermistor. Multiplexing up to 16 thermocouple-conditioned channels at 300 ksps allows simultaneous thermocouple-array scanning in heat-treatment ovens and HVAC systems. Pairing the part with RTD-conditioned amplifiers lets a single IC service both contact and non-contact temperature inputs, while the 4.096 V internal reference gives 1 mV/LSB scaling that pairs cleanly with K-type and J-type thermocouple tables. The FIFO and shutdown mode support battery-powered HVAC handheld instruments.
Được đề xuất
Battery-Powered Wireless Sensor Hubs
Wireless sensor hubs (LoRa, BLE, Zigbee gateways) use the MAX1231AEEG+T to digitize multiple analog sensors before a single radio transmission, taking advantage of the 16-entry FIFO that lets the MCU aggregate data between radio events. The 1 µA shutdown current between scans enables years of battery life on a single 3.6 V lithium AA cell when sampling once per minute. The internal 4.096 V reference and 12-bit resolution give sufficient dynamic range for environmental sensor (temperature, humidity, soil-moisture, gas) measurements, while the ±1°C on-die sensor reports module-internal temperature compensation data.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1231AEEG+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 | MAX1231ACEG+T | MAX1231BCEG+ | MAX1231BEEG+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-pin SSOP | 24-pin SSOP - same | 24-pin SSOP - same | 24-pin SSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit |
| Sample Rate | 300 ksps | 300 ksps | 300 ksps | 300 ksps |
| Number of Input Channels | 16 single-ended | 16 single-ended | 16 single-ended | 16 single-ended |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Internal Temperature Sensor | Yes (±1 °C) | Yes (±1 °C) | Yes (±1 °C) | Yes (±1 °C) |
| FIFO Buffer | 16 entries | 16 entries | 16 entries | 16 entries |
| Active Supply Current | 2.7 mA | 2.7 mA | 2.7 mA | 2.7 mA |
Bảo phân biệt quan trọng
- Internal ±1°C temperature sensor shared through analog mux (vsMAX1231ACEG+T)
- 16-entry FIFO reduces host SPI bus traffic by 16x (vsMAX1231BCEG+)
- 24-pin SSOP footprint compatible with full MAX1227/MAX1229/MAX1231 family (vsMAX1231BEEG+)
Ghi chú thiết kế
Place a 0.1 µF ceramic bypass capacitor within 5 mm of the AVDD pin and another 0.1 µF within 5 mm of DVDD. Add a 10 µF bulk tantalum or ceramic capacitor at the supply input to suppress digital-side switching noise from corrupting the analog reference. Decoupling at REF is optional but recommended - a 0.1 µF cap on REF reduces reference noise coupling during conversions.
Estimated: at 300 ksps continuous operation with AVDD = 3.3 V, the MAX1231AEEG+T consumes roughly 9 mW (2.7 mA × 3.3 V). For a 24-pin SSOP with a typical theta_JA of 100 °C/W, the steady-state junction rise above ambient is under 1 °C, so no heatsink is required. At industrial ambient of +85 °C the junction remains well below the +150 °C absolute maximum.
Keep analog input traces short and route them away from digital lines (SCLK, DOUT, DIN, CS) by at least 3 mm or with a ground-fill shield to prevent digital-to-analog crosstalk. Use a single solid ground plane under the IC and stitch vias around the perimeter. Place the analog multiplexer inputs in matched-length groups to preserve channel-to-channel gain matching.
Do not apply analog inputs above AVDD + 0.3 V; the input ESD structure can be damaged by over-range voltages. Always assert SHDN low or CS high before changing analog input channel range to avoid spurious conversion results. Allow at least 1 ms after power-up before initiating conversions to let the internal reference settle to within 1 LSB.
Thông tin tuân thủ
RoHS compliant per Maxim/Analog Devices product declaration. Industrial temperature grade -40°C to +85°C. AEC-Q100 not qualified; for automotive applications consult ADI automotive-grade SAR portfolio.
