MAX1394MTB+T - 8-Bit 416ksps SAR ADC | Maxim Integrated
부품 번호: MAX1394MTB+T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.62 | $3.62 |
| 10 | $3.25 | $32.50 |
| 100 | $2.88 | $288.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.27 | $2,270.00 |
MAX1394MTB+T 개요
A SAR ADC is a type of data converter that uses a binary-search algorithm implemented with a capacitive charge-redistribution DAC and a single comparator. Each conversion cycle resolves one bit at a time over N clock cycles for an N-bit result. SAR ADCs are valued for their deterministic latency (single-cycle conversion), low power consumption, and excellent DC accuracy compared to sigma-delta or pipelined architectures of similar resolution. The MAX1394MTB+T belongs to the data-acquisition IC category, within the signal-chain family of mixed-signal semiconductor components.
Key features include 416 ksps maximum sampling rate, an external reference input for design flexibility, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, true-differential or 2-channel single-ended input, automatic power-down between conversions, and a -40C to +85C industrial operating temperature range. The 10-TDFN package with exposed pad provides low thermal resistance and a compact 3 mm x 3 mm footprint suited to space-constrained PCB designs.
The device integrates an input multiplexer, sample-and-hold, and SAR core in a single IC, eliminating the need for external signal-conditioning components. The external reference allows designers to optimize the input dynamic range for transducer scaling, while the SPI-compatible serial output enables direct connection to microcontrollers, DSPs, and FPGAs without parallel data-bus overhead.
Typical applications include portable instrumentation, battery-powered sensor monitoring, industrial process control loops, handheld multimeters, and consumer audio metering. The micropower consumption extends battery life in wireless sensor nodes and wearable health devices.
When designing with this part, choose the external reference voltage to set the LSB weight and ensure the source impedance is below the datasheet's recommended maximum to avoid gain errors. Place a 0.1 uF bypass capacitor as close as possible to the supply pin and tie the exposed pad to a clean analog ground plane for optimal noise performance.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: MAX1394MTB+T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX1394MTB+T (동일 폼 팩터 및 풋프린트) — 차이점: Input Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX1391ETB+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1394ETB+T
✅ 드롭인✓ 재고 있음
$2.4 / 개
데이터시트 보기 →MAX1394MTB-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX14672ETB+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX17672CATB+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1394MTB+T 최대 정격 & 전기적 특성
| Number of Bits | 8 |
| 샘플링 속도 | 416 ksps |
| Number of Inputs | 2 (single-ended) / 1 (differential) |
| Input Type | Single-Ended / True-Differential |
| Architecture | SAR (Successive Approximation) |
| Data Interface | SPI, QSPI, MICROWIRE, DSP-Compatible Serial |
| Supply Voltage Range | 1.5 V to 3.6 V |
| Reference Type | External |
| Configuration | MUX-S/H-ADC |
| 패키지 / 케이스 | 10-WFDFN Exposed Pad (TDFN-10, 3x3 mm) |
| 동작 온도 범위 | -40C to +85C |
| Temperature Grade | Military (per Partstack) |
| 실장 유형 | Surface Mount |
| Terminal Form | No Lead |
| Number of Terminals | 10 |
| Packaging | Tape & Reel (TR) |
MAX1394MTB+T 핀 구성
| 핀 1 | AIN1+ — Positive analog input 1 (single-ended/differential) |
| 핀 2 | AIN1- — Negative analog input 1 (differential) |
| 핀 3 | AIN2 — Analog input 2 (single-ended) |
| 핀 4 | REF — External reference voltage input |
| 핀 5 | GND — Ground |
| 핀 6 | VDD — Analog/digital supply voltage (1.5 V to 3.6 V) |
| 핀 7 | CS — Chip select (active low) |
| 핀 8 | DOUT — Serial data output |
| 핀 9 | SCLK — Serial clock input |
| 핀 10 | EP — Exposed thermal pad - tie to analog GND |
일반적인 애플리케이션
MAX1394MTB+T 적합 용도: 6 애플리케이션s: Portable Battery-Powered Sensor Monitoring, Industrial Process-Control Loop Digitization, Handheld Digital Multimeter Input Stage, Consumer Audio VU Meter / Level Display, Wireless Sensor Node (IoT) Battery Telemetry, White-Goods and Appliance Control Boards.
Portable Battery-Powered Sensor Monitoring
Why MAX1394MTB+T fits: The MAX1394MTB+T's micropower operation and 1.5 V to 3.6 V supply range allow direct connection to a single Li-ion or 2xAA cell stack without boost regulation. The 8-bit resolution and 416 ksps throughput are sufficient to digitize temperature, pressure and humidity sensor outputs at sub-1 kHz bandwidth. How it is used: The ADC sits between the analog sensor bridge/MEMS output and a low-power MCU; the external reference is shared with the sensor excitation to maximize SNR. Automatic power-down between conversions extends battery life, and the SPI output feeds directly to the MCU's hardware SPI port with no glue logic. Trade-off vs a 12-bit ADC: lower resolution (~39 mV LSB at 5 V ref) means small-signal accuracy is reduced, but quiescent current savings of 5x to 10x versus higher-resolution SARs make this part ideal for multi-year-life sensor nodes.
추천
Industrial Process-Control Loop Digitization
Why MAX1394MTB+T fits: The -40C to +85C industrial operating range and true-differential input option make the MAX1394MTB+T suitable for digitizing 4-20 mA current-loop or bridge-sensor outputs in factory automation. The 1.5 V to 3.6 V supply is compatible with 3.3 V PLC backplanes, and the 10-TDFN exposed-pad package provides low thermal resistance for hot DIN-rail enclosures. How it is used: One differential channel digitizes a bridge/strain-gauge signal while the second single-ended channel monitors a thermocouple or supply rail. The SPI output connects to an MCU or FPGA that performs linearization and PID control. Trade-off vs a 16-bit ADC: 8 bits (256 codes) is sufficient for on/off or threshold control but inadequate for precision weighing or closed-loop servo; choose MAX1165AEUI+T for those applications.
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Handheld Digital Multimeter Input Stage
Why MAX1394MTB+T fits: The MAX1394MTB+T's 8-bit resolution covers typical 3-1/2 digit (2000-count) handheld DMM display requirements, and its 416 ksps rate supports autoranging measurement sweeps in well under 100 ms per channel. The 1.5 V to 3.6 V supply runs from two AAA cells directly, and the exposed-pad TDFN package enables compact PCB layouts inside meter housings. How it is used: The ADC multiplexes between voltage, current and resistance measurement paths through an external analog front end; the SPI output feeds the meter's display MCU. The external reference is shared with the precision resistor network to maintain gain accuracy. Trade-off: for True-RMS or 6000-count meters, designers move to the 12-bit MAX11100 or 16-bit MAX1165 family for the extra dynamic range.
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Consumer Audio VU Meter / Level Display
Why MAX1394MTB+T fits: The MAX1394MTB+T's 416 ksps sampling rate easily captures audio-bandwidth signals up to 20 kHz with margin, while the 8-bit resolution is sufficient for logarithmic VU display bargraphs where absolute amplitude accuracy is less critical than dynamics. The micropower consumption preserves battery life in portable audio gear, and the SPI interface allows the MCU driving the LED/LCD bargraph to read the ADC with minimal code overhead. How it is used: An AC-coupled audio signal drives one single-ended input; the external reference scales the display to full-scale at the desired peak level. Trade-off vs audio-specific codecs: the MAX1394MTB+T has no decimation filter or integrated PGA, so designers add an external op-amp front end rather than using this as a direct audio ADC.
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Wireless Sensor Node (IoT) Battery Telemetry
Why MAX1394MTB+T fits: The micropower automatic power-down between conversions (microamp-level quiescent) and 1.5 V to 3.6 V supply match Li-ion/thium coin-cell battery rails used in wireless sensor nodes. The 416 ksps throughput supports burst-mode sampling triggered by interrupts, while the 8-bit resolution provides 1% accuracy adequate for battery-voltage telemetry and environmental sensor data. How it is used: The ADC periodically digitizes battery voltage, temperature and an external sensor, then the SPI output is read by the node's MCU before each LoRa/Zigbee/BLE transmission. The exposed pad keeps the die temperature stable during sleep/wake cycles. Trade-off: for higher-precision IoT nodes needing 16-bit ENOB, designers migrate to the MAX1165AEUI+T with similar TDFN form factor.
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White-Goods and Appliance Control Boards
Why MAX1394MTB+T fits: The MAX1394MTB+T's industrial -40C to +85C operating range and small 10-TDFN (3x3 mm) exposed-pad package fit the thermal and space constraints of white-goods control boards (washers, dishwashers, refrigerators). The 8-bit SAR resolution is adequate for monitoring temperature, water level, motor current and user-knob position with appropriate signal conditioning. How it is used: An external analog multiplexer expands the two ADC inputs to multiple sensor channels; the SPI output connects to a low-cost appliance MCU. The exposed pad is soldered to a copper pour for thermal relief near relay-coil drivers. Trade-off: for inverter-motor-control boards requiring simultaneous current sampling, designers pair this part with the MAX12528ETK+ for the high-speed channels.
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추천 제품 요약
엔지니어링 참조 데이터: MAX1394MTB+T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX1391ETB+T | MAX1394ETB+T | MAX1394MTB-T | MAX14672ETB+T | MAX17672CATB+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Analog Devices |
| Package | 10-TDFN (3x3) | 10-TDFN (3x3) - same | 10-TDFN (3x3) - same | 10-TDFN (3x3) - same | WFDFN-10 - same | WFDFN-10 - same |
| Function | 8-bit SAR ADC | 12-bit SAR ADC | 8-bit SAR ADC | 8-bit SAR ADC | Supervisory circuit | Buck converter |
| Resolution | 8 bits | 12 bits | 8 bits | 8 bits | N/A (supervisor) | N/A (DC-DC) |
| Sampling Rate | 416 ksps | 416 ksps | 416 ksps | 416 ksps | N/A | N/A |
주요 차별점
- True drop-in upgrade path to 12-bit resolution in the same footprint (vs MAX1391ETB+T)
- Same package, opposite function - clarifies cross-reference confusion (vs MAX17672CATB+)
- Micropower automatic power-down for battery longevity (vs MAX1394ETB+T)
설계 노트
Place a 0.1 uF ceramic bypass capacitor as close as possible to the VDD pin (pin 6) and tie the exposed thermal pad (pin 10) to a clean analog ground plane using multiple vias. A noisy or high-impedance ground will degrade the ADC's SNR; route digital return currents (SCLK, DOUT, CS) away from the analog input traces to prevent digital switching noise from coupling into AIN1+/AIN1-. Per Maxim's MAX1391/MAX1394 datasheet, the exposed pad also serves as the primary thermal path and must be soldered for reliable operation.
Keep analog input traces short and guarded with a ground trace on each side of the PCB to minimize capacitive coupling from nearby digital lines. Add a small RC anti-aliasing filter (typically 1 kohm + 1 nF, fc = 159 kHz) ahead of AIN1+ when digitizing wideband sensor signals. Per the Maxim datasheet, source impedance above ~1 kohm introduces gain errors due to the input S/H dynamics; use a low-impedance buffer op-amp for high-impedance transducers.
Do not exceed 3.6 V on VDD - the MAX1394MTB+T is not 5 V tolerant. Ensure the external reference voltage at REF (pin 4) does not exceed VDD; a higher reference clamps at VDD and corrupts the full-scale conversion. The CS pin must be pulled low before each conversion; leaving it floating or tied high prevents DOUT from being clocked out. Per Maxim's datasheet, the SCLK idle state must be logic-low for proper SPI timing - some MCUs default to SPI mode 1 (clock-idle-high), which will not work with this ADC.
규정 준수 정보
RoHS compliant per DigiKey product listing. Lead-free (Pb-free) per the '+' suffix in the MPN which indicates lead-free terminal finish. Not AEC-Q100 qualified - the part is targeted at industrial/commercial/consumer segments, not automotive.
