MAX1071CTC+T - 1.5Msps 10-Bit Differential SAR ADC | Analog Devices
부품 번호: MAX1071CTC+T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.72 | $6.72 |
| 10 | $6.05 | $60.50 |
| 100 | $5.38 | $538.00 |
| 500 | $4.84 | $2,420.00 |
| 1,000 | $4.31 | $4,310.00 |
MAX1071CTC+T 개요
A successive-approximation ADC is a type of data converter that converts an analog input voltage into a digital code through a binary-search algorithm using an internal DAC and comparator. SAR ADCs sit in the hierarchy: ADC -> data converter -> data acquisition IC -> signal chain IC -> semiconductor. They are favored for applications requiring high accuracy, low latency, and deterministic sampling, which sets them apart from delta-sigma ADCs (higher resolution, slower) and pipeline ADCs (very fast, higher latency). The MAX1071 belongs to the SAR family.
Key features include true-differential analog inputs for superior common-mode noise rejection, an internal 2.5V reference (with the option to drive an external reference), an SPITM/QSPI/MICROWIRE-compatible serial interface, and a hardware- or software-controlled shutdown mode that drops supply current to the microampere range between conversions. The 12-pin TQFN package offers a compact 4x4 mm footprint with an exposed pad for low thermal resistance and improved electrical grounding. The +T suffix indicates tape-and-reel packaging for high-volume assembly.
From an architecture standpoint, the MAX1071 uses a capacitive-charge-distribution DAC combined with a high-bandwidth comparator and a precision 2.5V bandgap reference. The true-differential input structure allows direct measurement of bridge sensors, thermocouples, and other small differential signals without external instrumentation amplifiers, which simplifies the analog front-end and reduces total BOM cost.
Typical applications include industrial process control, data acquisition systems, portable instrumentation, battery-powered sensor monitoring, optical module monitoring, and motor control feedback loops. The differential input architecture also makes it well-suited to medical instrumentation front-ends and sonar/radar intermediate-frequency sampling where ground noise is a concern.
A key design consideration is input common-mode voltage and source impedance: the input sampling capacitors require adequate settling time, so place a low-impedance buffer or anti-alias RC network immediately ahead of AIN+ and AIN-. For best linearity, drive REF+ directly from a low-noise reference source and decouple REF- to analog ground with a 0.1uF ceramic capacitor placed within a few millimeters of the pin.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers choose and qualify the MAX1071CTC+T with confidence.
드롭인 대체품: MAX1071CTC+T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX1071CTC+T (동일 폼 팩터 및 풋프린트) — 차이점: Package, Input Type, Internal Reference, Resolution, Architecture.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX1071ETC+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1070CTC+
✅ 드롭인✓ 재고 있음
$5.18 / 개
데이터시트 보기 →MAX1070CTC+T
✅ 드롭인✓ 재고 있음
$4.78 / 개
데이터시트 보기 →MAX1071CTC+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1067BCEE
✅ 드롭인✓ 재고 있음
$9.4 / 개
데이터시트 보기 →MAX1071CTC+T 최대 정격 & 전기적 특성
| 분해능 | 10 bit |
| 샘플링 속도 | 1.5 Msps (max) |
| Number of Channels | 1 differential input |
| Architecture | SAR (Successive Approximation) |
| Input Type | True differential |
| Analog Supply Voltage | 2.7 V to 3.6 V (single supply) |
| Digital Supply Voltage | 2.7 V to 3.6 V |
| Internal Reference | 2.5 V |
| External Reference Support | Yes |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Shutdown Mode | Yes (hardware/software controlled) |
| 동작 온도 범위 | -40 C to +85 C |
| 패키지 | 12-TQFN (4x4 mm) with exposed pad |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 1 (per JEDEC J-STD-020) |
| Lead Free / RoHS | Yes / Compliant |
| 핀 수 | 12 |
| Converter Type | Data Acquisition - ADC |
MAX1071CTC+T 핀 구성
| 핀 1 | AIN+ — Positive differential analog input |
| 핀 2 | AIN- — Negative differential analog input |
| 핀 3 | REF+ — Reference input/output (+2.5V internal) |
| 핀 4 | REF- — Reference ground (tie to AGND) |
| 핀 5 | AVDD — Analog supply voltage (2.7V-3.6V) |
| 핀 6 | AGND — Analog ground |
| 핀 7 | SCLK — Serial clock input (SPI) |
| 핀 8 | DOUT — Serial data output (SPI) |
| 핀 9 | CS — Active-low chip select |
| 핀 10 | SHDN — Active-low shutdown input |
| 핀 11 | DVDD — Digital supply voltage (2.7V-3.6V) |
| 핀 12 | DGND — Digital ground |
일반적인 애플리케이션
MAX1071CTC+T 적합 용도: 6 애플리케이션s: Industrial Process Control, Portable Battery-Powered Instrumentation, Optical Module Monitoring, Motor Control Feedback Sensing, Medical Instrumentation Front-End, Data Acquisition Systems.
Industrial Process Control
The MAX1071CTC+T's true-differential inputs and 1.5 Msps throughput make it ideal for industrial process control loops where sensor signals must be digitized accurately in the presence of motor and relay common-mode noise. The 10-bit resolution (1024 codes, ~2.5 mV/LSB with internal reference) is sufficient for temperature, pressure, and flow transmitters in 4-20 mA loop replacements. The MAX1071's single-supply 2.7V-3.6V operation simplifies loop-powered designs, while the SPI-compatible interface connects directly to low-cost microcontrollers. Compared to delta-sigma ADCs, the SAR architecture provides deterministic single-conversion latency critical for closed-loop PID control. For best noise rejection, place the MAX1071 within 50 mm of the sensor and use a shielded twisted-pair cable.
추천
Portable Battery-Powered Instrumentation
The MAX1071CTC+T's low supply current and hardware-controlled shutdown mode (microampere-level idle current) make it a strong fit for portable, battery-powered data loggers and handheld test instruments. Operating from a single 2.7V-3.6V supply, the part can run directly from a single Li-ion cell without level shifting. The shutdown feature lets the system wake up periodically to take a burst of conversions, then return to deep sleep, extending battery life by 10-100x. The 12-TQFN (4x4 mm) footprint is small enough for wearable sensor patches. Compared to delta-sigma ADCs, the SAR architecture's per-sample power efficiency is competitive because the part only draws current during active conversion. Place a 0.1 uF decoupling capacitor on each supply pin and a 10 uF bulk capacitor near AVDD.
추천
Optical Module Monitoring
SFP/QSFP optical transceivers require back-facet photodiode monitoring and TEC current sensing, both of which are well served by the MAX1071CTC+T. The 1.5 Msps sampling rate captures fast laser bias transients during burst-mode operation, while the true-differential inputs reject ground noise from the adjacent laser driver. The internal 2.5V reference eliminates the need for an external reference IC, reducing BOM cost and PCB area in compact SFF modules. Compared to slower 10-bit ADCs (e.g., 200 kSPS parts), the MAX1071 has 7x the headroom for sampling multiple monitor points through an external analog mux. Place the MAX1071 adjacent to the photodiode preamp and route AIN+/AIN- as a matched-length differential pair.
추천
Motor Control Feedback Sensing
The MAX1071CTC+T's 1.5 Msps throughput and true-differential analog inputs suit three-phase motor control current and voltage feedback loops. Sampling shunt-resistor currents at 100 kHz PWM rates with adequate phase margin requires fast ADC conversion, and the MAX1071's deterministic SAR latency simplifies the control loop math compared to pipeline or delta-sigma ADCs. The differential inputs reject the high dv/dt common-mode noise from the switching FETs, eliminating the need for isolated current sensors in low-voltage (<60V) drives. For 10-bit resolution (~1% full-scale), the MAX1071 is adequate for torque and speed control loops but engineers targeting field-oriented control at higher precision should consider the MAX1070CTC+ (12-bit). Decouple AVDD and DVDD separately and use a Kelvin connection to the shunt resistor.
추천
Medical Instrumentation Front-End
The MAX1071CTC+T's true-differential input structure and low noise floor make it a candidate for medical instrumentation front-ends, particularly portable pulse oximeters, body-worn ECG patches, and bedside patient monitors. The differential inputs reject 50/60 Hz mains common-mode interference, while the SPI-compatible interface allows direct connection to low-power medical MCUs. Operating from 2.7V-3.6V, the part runs from a single Li-ion or 2xAA cell. For ECG applications, 10-bit resolution at 1.5 Msps is more than sufficient for the 250 Hz signal bandwidth after anti-aliasing filtering. Place a precision instrumentation amp (e.g., AD8421 or MAX4460) in front of the MAX1071's AIN+/AIN- pins for high-impedance electrode inputs.
추천
Data Acquisition Systems
Multichannel data acquisition systems built around the MAX1071CTC+T pair the part with an external 4:1 or 8:1 analog mux (e.g., MAX4617) to sample multiple sensors sequentially. The MAX1071's 1.5 Msps conversion rate supports aggregate sampling rates of 187 kSps per channel when muxing 8 inputs, which is fast enough for vibration, acoustic, and structural-health monitoring. The true-differential inputs eliminate the need for per-channel instrumentation amplifiers when using differential sensors (e.g., bridge pressure transducers, RTDs in a 4-wire configuration). The internal 2.5V reference simplifies BOM, and the SPI-compatible interface can be daisy-chained across multiple MAX1071 chips for higher channel counts. Compared to integrated multi-channel ADCs like the MAX1067BCEE, the MAX1071 trades channel count for differential input flexibility.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX1071CTC+T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX1071ETC+T | MAX1070CTC+ | MAX1070CTC+T | MAX1071CTC+ | MAX1067BCEE |
|---|---|---|---|---|---|---|
| Package | 12-TQFN (4x4 mm) | 12-TQFN (4x4 mm) - same | 12-TQFN (4x4 mm) - same | 12-TQFN (4x4 mm) - same | 12-TQFN (4x4 mm) - same | 16-QSOP (different footprint, requires PCB rework) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 10 bit | 10 bit | 12 bit | 12 bit | 10 bit | 12 bit |
| Sampling Rate | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps | 200 ksps |
| Input Configuration | 1 differential | 1 differential | 1 differential | 1 differential | 1 differential | 4 single-ended |
| Supply Voltage | 2.7V to 3.6V | 2.7V to 3.6V | 2.7V to 3.6V | 2.7V to 3.6V | 2.7V to 3.6V | 4.75V to 5.25V |
| Internal Reference | 2.5V | 2.5V | 2.5V | 2.5V | 2.5V | 4.096V |
| Temperature Range | 0C to +70C (commercial) | -40C to +85C (extended) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) | 0C to +70C (commercial) |
주요 차별점
- True-differential input architecture in a tiny 4x4 mm TQFN (vs MAX1067BCEE)
- 7.5x faster sampling rate than competing 12-bit multi-channel ADC (vs MAX1067BCEE)
- 12-bit upgrade available in identical pin-compatible package (vs MAX1070CTC+)
- Single-supply 3.3V operation with internal reference (vs MAX1067BCEE)
설계 노트
Decouple AVDD and DVDD separately with a 0.1 uF ceramic capacitor placed within 5 mm of each supply pin, plus a shared 10 uF bulk tantalum or ceramic capacitor at the chip's supply entry point. For low-noise operation, place a small ferrite bead between AVDD and DVDD to isolate digital switching noise from the analog reference. According to the manufacturer datasheet, AVDD and DVDD can be tied together when powered from a single low-impedance supply, but separate filtering is recommended for best 10-bit AC performance.
Route AIN+ and AIN- as a matched-length, impedance-controlled differential pair (typically 50 ohm or 100 ohm) to preserve common-mode rejection. The exposed thermal pad (EP) of the 12-TQFN must be soldered to a continuous analog ground copper pour to provide both thermal dissipation and a low-inductance ground reference. Place REF+ bypass capacitor (0.1 uF ceramic) and REF- to AGND within 3 mm of the package pins to minimize reference noise pickup.
The MAX1071's true-differential inputs reject common-mode noise, but the source impedance seen at AIN+/AIN- must be kept below 1 kohm to allow the internal sampling capacitors (typically 16-20 pF) to settle within the acquisition window. Add a small RC anti-alias filter (typically 100 ohm + 330 pF) at the ADC inputs to limit out-of-band noise and prevent kickback from the sampling network. Estimated: with 100 ohm source and 330 pF, the filter bandwidth is 4.8 MHz, providing ~30 dB attenuation at the SPI clock harmonics while maintaining 10-bit settling at 1.5 Msps.
Common pitfalls when designing with the MAX1071CTC+T include: (1) leaving the exposed pad un-soldered, which causes excessive thermal resistance and degrades noise performance; (2) driving AIN+/AIN- with source impedances above 1 kohm, which causes gain errors and non-linear distortion; (3) using CS as a clock gating signal rather than a frame synchronization, which can cause spurious conversions; (4) neglecting to bypass REF- to AGND, which couples reference noise into the input sampling. The shutdown pin (SHDN) must be tied high (logic 1) for normal operation - floating the pin can leave the part in an indeterminate state.
규정 준수 정보
RoHS compliant per Analog Devices (formerly Maxim) product page. Not AEC-Q100 qualified - choose MAX1071ETC+T for industrial-grade or MAX1070ETC+T (automotive grade variant) for AEC-Q100 applications.
