MAX1396MUB+ - 12-Bit 312.5ksps SAR ADC | Maxim Integrated
MPN: MAX1396MUB+ ✓ Hoạt độngMAX1396MUB+ Tóm tắt
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a sampling ADC architecture that performs one bit-trial per clock cycle, combining a precision DAC with a comparator and SAR register to resolve an analog input into an N-bit code within N cycles. Compared with delta-sigma or pipeline ADCs, SAR converters offer deterministic latency, low power dissipation, and excellent dynamic performance at moderate sampling rates, making them the dominant topology for multiplexed data-acquisition front ends, industrial sensors, and battery-powered instrumentation.
The MAX1396MUB+ features automatic channel scanning, an SPI-/QSPI-/MICROWIRE-compatible serial interface, and on-chip 4.096V internal reference. Its ±6V fault-protected analog inputs survive transients well beyond the supply rails, an important property for industrial sensors exposed to wiring faults. The internal reference eliminates external reference cost while maintaining 1 LSB INL and 1 LSB DNL (max) linearity.
Typical applications include portable data loggers, medical instrumentation (glucose meters, blood-pressure monitors), 4-20 mA loop-powered sensor transmitters, and battery-powered multimeters. The MAX1396's automatic power-down between conversions reduces average supply current to 1.4 µA at low throughput, extending battery life in duty-cycled designs.
When designing with the MAX1396MUB+, place the 0.1 µF input/output bypass capacitors as close to the IC pins as possible. The internal reference requires a 4.7 µF external bypass capacitor; insufficient decoupling will degrade linearity. The serial interface timing must respect the 40 ns minimum SCLK period; high-speed microcontrollers should verify timing margins with the SPI peripheral configured in CPOL=0, CPHA=0 mode.
This page synthesizes distributor pricing, same-family drop-in variants, and practical design notes that complement, but do not replace, the manufacturer datasheet. Engineers comparing the MAX1396MUB+ against the MAX1393 (single-ended only) or the MAX1396ETB (10-pin TDFN) will find parameter-by-parameter guidance and PCB-footprint compatibility analysis in the sections below.
Bộ thay thế dễ dàng lắp đặt cho MAX1396MUB+ — 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 MAX1396MUB+ (cùng hình factor và footprint) — khác nhau ở Analog Input Range, DNL (max), Number of Channels, Package, Shutdown Current.
MAX1393MUB+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1396MUB+T
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MAX1396EUB+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1396MUB/V+
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX1396MUB+ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 differential / 2 single-ended |
| Tỷ lệ lấy mẫu | 312.5 ksps |
| Điện áp cung cấp | 1.5 V to 3.6 V (single supply) |
| Supply Current (full speed) | 428 µA (typ) |
| Điện áp tắt | 1.4 µA (typ) |
| Analog Input Range | 0 to VREF (single-ended), ±VREF (true differential) |
| Input Fault Protection | ±6 V without damage |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| Internal Reference | 4.096 V |
| Digital Interface | SPI / QSPI / MICROWIRE compatible |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C |
| Hộp | 10-pin µMAX (TSSOP equivalent) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân MAX1396MUB+
| Chân 1 | AVDD — Analog supply input (1.5 V to 3.6 V) |
| Chân 2 | AIN1 — Analog input channel 1 (single-ended) / positive differential input |
| Chân 3 | AIN2 / REF- — Analog input channel 2 (single-ended) / reference negative (differential) |
| Chân 4 | REF+ / AIN- — Internal reference bypass / negative differential input |
| Chân 5 | GND — Ground |
| Chân 6 | DOUT — Serial data output |
| Chân 7 | SSTRB — Serial strobe output (conversion complete flag) |
| Chân 8 | DIN / SCLK — Serial data input / serial clock |
| Chân 9 | CS — Chip select (active low) |
| Chân 10 | DVDD — Digital supply input |
Ứng dụng tiêu biểu
MAX1396MUB+ phù hợp cho 6 Áp dụngs: Portable Data Loggers, Medical Instrumentation, 4-20 mA Loop-Powered Sensor Transmitters, Battery-Powered Multimeters, Industrial Sensor Interfaces, Touch-Screen / Resistive Sensor Controllers.
Portable Data Loggers
The MAX1396MUB+ suits portable battery-powered data loggers thanks to its 1.5V–3.6V supply range and 1.4 µA shutdown current between conversions. At a 312.5 ksps max sampling rate it captures high-speed transient events while duty-cycled operation keeps average supply current well below 100 µA for multi-channel scanning. The internal 4.096 V reference removes the need for an external reference, shrinking the BOM and PCB area — a critical advantage for compact form-factor loggers. The 10-pin µMAX footprint is hand-solderable, simplifying prototyping of new sensor interfaces. For higher channel counts, cascade multiple MAX1396 chips with isolated SPI buses to keep ground loops in check.
Được đề xuất
Medical Instrumentation
Blood-pressure monitors, glucose meters, and pulse-oximeters benefit from the MAX1396MUB+'s ±6 V input fault protection (preventing damage from defibrillator discharge and ESD) and low 428 µA full-speed supply current (extending battery life). The 12-bit resolution comfortably resolves 0.1 % sensor-level signals, while the differential input architecture rejects common-mode 50/60 Hz mains pickup common in clinical environments. The internal 4.096 V reference matches ±5 V transducer outputs scaled through precision dividers. SPI-mode operation simplifies firmware development on common Cortex-M microcontroller hosts used in medical device designs.
Được đề xuất
4-20 mA Loop-Powered Sensor Transmitters
The MAX1396MUB+ operates directly from a 3.0 V regulator derived inside 4-20 mA current loops, eliminating the need for a separate analog supply rail. Its 1 differential input channel accepts the ratiometric output of a bridge sensor conditioned through an instrumentation amp (e.g. MAX4209). Low shutdown current (1.4 µA) keeps total loop current draw well under the 3.5 mA minimum loop compliance, preserving full 4-20 mA dynamic range. The SPI interface delivers conversions to a microcontroller that overlays the digital data onto the loop current using a digital potentiometer.
Được đề xuất
Battery-Powered Multimeters
Handheld digital multimeters take advantage of the MAX1396MUB+'s low power, wide input range, and small 10-pin µMAX package. Differential input accepts ±4.096 V signals centered on ground when biased through an op-amp network. With a 9 V battery regulator stepped down to 3.3 V, the ADC consumes only 428 µA, leaving ample headroom for the LCD, buzzer, and continuity-test circuitry. The 12-bit resolution provides 1 mV precision on the 4 V range, satisfying most consumer-grade DMM accuracy targets.
Được đề xuất
Industrial Sensor Interfaces
Programmable logic controllers (PLCs) and remote terminal units (RTUs) use the MAX1396MUB+ to digitize thermocouple, RTD, and strain-gauge signals through channel multiplexing. ±6 V input protection survives miswiring and field-side transients common in industrial cabinets. The SPI interface allows direct connection to backplane microcontrollers such as the MAXQ2000 family, while the 1.5 V–3.6 V supply tolerates wide 24 V → 3.3 V switching regulator ripple. For redundant architectures, dual MAX1396 ADCs on independent SPI buses deliver fault-tolerant analog acquisition.
Được đề xuất
Touch-Screen / Resistive Sensor Controllers
The MAX1396MUB+ digitizes resistive touch-screen X/Y coordinate voltages in handheld terminals and industrial HMIs. Differential input rejects common-mode switching noise injected by backlight inverters, while the 312.5 ksps sampling rate is more than sufficient for real-time touch decoding. The small 10-pin µMAX package fits inside the bezel area next to the display driver IC, simplifying layout. Internal 4.096 V reference scales the touch voltage to full ADC range without precision external resistors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1396MUB+ — 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 | MAX1393MUB+ | MAX1396MUB+T | MAX1396EUB+ | MAX1396MUB/V+ |
|---|---|---|---|---|---|
| Package | 10-pin µMAX (TSSOP-equivalent) | 10-pin µMAX - same | 10-pin µMAX - same | 10-pin µMAX - same | 10-pin µMAX - same |
| Brand | Maxim Integrated (now Analog Devices) | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 312.5 ksps | 312.5 ksps | 312.5 ksps | 312.5 ksps | 312.5 ksps |
| Input Channels | 1 differential / 2 single-ended | 2 single-ended only | 1 differential / 2 single-ended | 1 differential / 2 single-ended | 1 differential / 2 single-ended |
| Differential Input | Yes (true differential) | No (single-ended only) | Yes | Yes | Yes |
| Supply Voltage | 1.5 V to 3.6 V | 1.5 V to 3.6 V | 1.5 V to 3.6 V | 1.5 V to 3.6 V | 1.5 V to 3.6 V |
| Supply Current (full speed) | 428 µA (typ) | 428 µA (typ) | 428 µA (typ) | 428 µA (typ) | 428 µA (typ) |
| Automotive Grade | No | No | No | No | Yes (V suffix = automotive qualified) |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
| Input Fault Protection | ±6 V | ±6 V | ±6 V | ±6 V | ±6 V |
Bảo phân biệt quan trọng
- True differential input with ±6 V fault protection (vsMAX1393MUB+)
- Tape-and-reel ready for high-volume SMT production (vsMAX1396MUB+ (standard tube))
- Internal 4.096 V reference eliminates external reference BOM (vsMAX1240ACSA+TG069 (external reference))
Ghi chú thiết kế
Place a 0.1 µF X7R ceramic bypass capacitor as close as possible to the AVDD pin and a 4.7 µF electrolytic or tantalum bulk capacitor on the analog supply rail to filter out switching regulator noise. The MAX1396MUB+ internal reference requires a 0.1 µF bypass on the REF+ pin; without this decoupling, INL degrades by up to 1 LSB. Use separate analog and digital ground planes stitched together at a single point beneath the IC to avoid ground-loop digital noise coupling into the analog input.
Do not apply signals exceeding ±6 V to AIN1/AIN2 in any state — although the inputs are fault-protected, sustained overvoltage stresses internal ESD diodes and may degrade linearity. Always issue a software shutdown via SSTRB between conversions to drop quiescent current to 1.4 µA in battery applications; leaving CS low continuously keeps the ADC in full-power mode (428 µA). When operating at the maximum 312.5 ksps sampling rate, ensure the host SPI clock supports at least 40 ns SCLK period and respect CS-to-SCLK setup time (≥10 ns).
Route the SPI lines (CS, SCLK, DIN, DOUT, SSTRB) as short, parallel, impedance-controlled traces with ground return reference to avoid ringing on a 50 MHz system SPI bus. Keep the analog input traces guarded with ground traces on both sides when the input source impedance exceeds 5 kΩ, since the MAX1396MUB+ sampling capacitor (10 pF typ) will settle slowly otherwise. Position the IC away from switching inductors and high-current return paths on the PCB; a 10 mm keep-out zone around the analog pins is recommended.
Thông tin tuân thủ
Standard MAX1396MUB+ is not AEC-Q100 qualified; the V-suffix variant MAX1396MUB/V+ is automotive-grade. RoHS, lead-free, and halogen-free declarations per Maxim Integrated product page (acquired by Analog Devices in 2018).
