MAX1090BEEI - 400ksps 8/4-Ch 10-Bit SAR ADC | Maxim Integrated
부품 번호: MAX1090BEEI ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $9.95 | $9.95 |
| 10 | $8.75 | $87.50 |
| 100 | $7.42 | $742.00 |
| 500 | $6.18 | $3,090.00 |
| 1,000 | $5.4 | $5,400.00 |
MAX1090BEEI 개요
An ADC (Analog-to-Digital Converter) is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes. SAR (Successive Approximation Register) ADCs use a binary-search algorithm with an internal DAC and comparator, offering an excellent trade-off between speed, accuracy, and power consumption for multi-channel data-acquisition systems. Within the broader taxonomy, the MAX1090BEEI belongs to successive-approximation ADCs -> data converters -> mixed-signal ICs -> signal chain -> semiconductor ICs.
Key features include 400 ksps maximum sampling rate, 10-bit resolution, 8 single-ended or 4 differential input channels, an integrated +2.5V reference (4.0 V/V input range when using internal reference with 5 V supply), automatic hardware power-down between conversions, parallel-architecture start/stop control, and a high-speed byte-wide parallel output bus. The MAX1090 is the 8-channel variant in the 28-pin QSOP; the MAX1092 is the 4-channel variant in the 24-pin QSOP.
The SAR core uses a charge-redistribution DAC with a precision comparator, and the integrated +2.5V reference eliminates the need for an external reference IC. The on-chip T/H (track-and-hold) supports input bandwidths suitable for multiplexed multi-channel acquisition, while the parallel interface simplifies connection to microcontrollers, DSPs, and FPGAs without requiring a serial-clock generator.
Typical applications include industrial process-control and data-acquisition systems, portable instrumentation and battery-powered data loggers, medical instruments and patient monitors, multichannel sensor interfaces (temperature, pressure, strain), and automotive telemetry subsystems. The wide analog input range and parallel output are well matched to legacy 8-bit/16-bit MCU buses.
When designing with this device, note that the MAX1090BEEI has been obsoleted (no longer manufactured); stock exists at authorized distributors but is finite. Designers should validate lifecycle status before committing to new designs. Refer to the manufacturer datasheet for full pinout, timing diagrams, and reference decoupling recommendations.
드롭인 대체품: MAX1090BEEI — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX1090BEEI (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Input Type, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX1090AEEI
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1090AEEI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1090BEEI+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1090BCEI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1090BCEI+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1090ACEI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS901E/1K
✅ 드롭인✓ 재고 있음
$2.59 / 개
데이터시트 보기 →MAX1090BEEI 최대 정격 & 전기적 특성
| 분해능 | 10 bits |
| Number of Channels | 8 single-ended / 4 differential (MAX1090); 4 single-ended / 2 differential (MAX1092) |
| 샘플링 속도 | 400 ksps |
| Architecture | SAR (Successive Approximation Register) |
| 공급 전압 | +5 V (analog), +5 V (digital, independent) |
| Analog Input Range | 0 to +5 V (unipolar) or ±5 V (bipolar) with external reference |
| Internal Reference | +2.5 V (on-chip) |
| Digital Interface | Byte-wide parallel (8-bit) |
| Number of ADC Converters | 1 |
| Input Type | Single-ended / Differential (software-selectable per channel pair) |
| Power-Down Mode | Automatic hardware power-down between conversions |
| Wake-Up Time | 2 µs (typical) |
| 패키지 | 28-pin QSOP (EE) |
| 실장 유형 | Surface Mount |
| 동작 온도 | -40°C to +85°C (industrial) |
| Conversion Channels | 1 SAR core with 8:1 input MUX |
MAX1090BEEI 핀 구성
| 핀 1 | AIN0 — Analog input channel 0 |
| 핀 2 | AIN1 — Analog input channel 1 |
| 핀 3 | AIN2 — Analog input channel 2 |
| 핀 4 | AIN3 — Analog input channel 3 |
| 핀 5 | AIN4 — Analog input channel 4 |
| 핀 6 | AIN5 — Analog input channel 5 |
| 핀 7 | AIN6 — Analog input channel 6 |
| 핀 8 | AIN7 — Analog input channel 7 |
| 핀 9 | AGND — Analog ground |
| 핀 10 | REF — Reference input/output (+2.5V internal) |
| 핀 11 | VDD — Analog supply (+5V) |
| 핀 12 | DGND — Digital ground |
| 핀 13 | CS — Chip Select (active low) |
| 핀 14 | WR — Write / Convert Start (active low) |
| 핀 15 | RD — Read (active low) |
| 핀 16 | INT — Interrupt / End-of-Conversion (active low) |
| 핀 17 | D0 — Data bit 0 (LSB) |
| 핀 18 | D1 — Data bit 1 |
| 핀 19 | D2 — Data bit 2 |
| 핀 20 | D3 — Data bit 3 |
| 핀 21 | D4 — Data bit 4 |
| 핀 22 | D5 — Data bit 5 |
| 핀 23 | D6 — Data bit 6 |
| 핀 24 | D7 — Data bit 7 (MSB) |
| 핀 25 | PD — Power-Down (active high) |
| 핀 26 | MODE — Mode Select (unipolar/bipolar) |
| 핀 27 | CLK — External Clock (or internal when grounded) |
| 핀 28 | DVDD — Digital supply (+5V) |
일반적인 애플리케이션
MAX1090BEEI 적합 용도: 6 애플리케이션s: Industrial Process Control & Data Acquisition, Portable Instrumentation & Data Loggers, Medical Instruments & Patient Monitoring, Multi-Channel Sensor Interfaces, Test & Measurement Instrumentation, Automotive Telemetry & Sensor Reading.
Industrial Process Control & Data Acquisition
The MAX1090BEEI's 8 single-ended or 4 differential input channels at 400 ksps make it well-suited for multi-sensor industrial process control panels and SCADA data-acquisition cards. With its integrated +2.5V reference, successive-approximation architecture, and +5V analog supply, the device handles thermocouple, RTD-bridge, 4-20 mA loop, and pressure transducer inputs with 10-bit precision and low noise. Placed between sensor signal-conditioning amplifiers and the host MCU/DSP, the MAX1090BEEI provides parallel-byte outputs that map directly to legacy 8-bit and 16-bit microcontrollers without requiring serial-clock generation. For factory-floor designs, its automatic hardware power-down between conversions reduces system thermal load - a key advantage for high-density DIN-rail and rack-mountable control systems.
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Portable Instrumentation & Data Loggers
With automatic hardware power-down and a 2 µs wake-up time, the MAX1090BEEI is engineered for battery-powered data loggers, portable multimeters, and field-rugged instrumentation where average supply current matters. The integrated +2.5V reference eliminates the external reference IC's quiescent draw, and the byte-wide parallel interface allows low-power MCUs to read conversions without active serial clocks. At a 400 ksps peak, the device is suitable for capturing transient events in handheld vibration, acoustic, or environmental monitors. Designers using the MAX1090BEEI in portable applications should note that the part is Obsolete; design teams planning new portable instruments should evaluate modern low-power 10-bit SAR ADCs (e.g., ADS7825 or AD7980 family) that draw microamps in standby.
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Medical Instruments & Patient Monitoring
The MAX1090BEEI's 8 single-ended channels are useful for medical front-end signal acquisition from ECG electrodes, pulse-oximetry photodiodes, temperature probes, and respiration sensors in patient monitoring equipment. Its 400 ksps sampling rate supports ECG front-ends up to 200 ksps per channel pair with simultaneous sampling techniques, while the integrated +2.5V reference and +5V analog supply simplify the medical IEC 60601-1 isolated power tree. The parallel interface enables direct DMA to medical microcontrollers and DSPs without serial-clock overhead. Engineers should verify that any medical design using the MAX1090BEEI accounts for the part's Obsolete status and plans end-of-life procurement or a planned redesign on a current-generation Maxim/Analog Devices 10-bit SAR ADC before regulatory submission.
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Multi-Channel Sensor Interfaces
With 8 single-ended / 4 differential inputs and software-selectable channel pairing, the MAX1090BEEI interfaces directly to multiplexed arrays of temperature sensors (thermistors, RTDs), strain gauges, pressure transducers, and flow sensors in industrial and HVAC control boards. The 400 ksps throughput supports polling rates of 50 ksps per channel across all 8 channels, which is adequate for slow-moving process variables (ms) up to mid-speed motion control feedback. The integrated +2.5V reference provides a stable ADC full-scale, while the differential input mode rejects common-mode noise from long sensor cables - critical for factory-floor installations. Note that the part is Obsolete; new sensor-interface designs should evaluate MAX1067/MAX1069, MAX1071, or TI ADS7825 family.
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Test & Measurement Instrumentation
Test equipment such as bench-top multimeters, oscilloscope front-end digitizer boards, and signal-analyzer sub-systems benefit from the MAX1090BEEI's parallel output and multi-channel MUX. The 400 ksps sampling rate captures repetitive waveforms with sufficient temporal resolution for 50 kHz-class audio and vibration analyses, while the 8-channel input supports multi-probe bench setups without external MUX ICs. The integrated +2.5V reference maintains conversion accuracy over temperature, and the byte-wide parallel interface plugs directly into FPGA-based data-acquisition backplanes. New bench-instrument designs should consider the TI ADS901E (28-pin QSOP, 100 ksps), ADI AD7980 family, or Linear Tech (Analog Devices) LTC2360/2365 12-/14-bit SAR ADCs for improved dynamic range.
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Automotive Telemetry & Sensor Reading
The MAX1090BEEI's wide analog input range (0 to +5V) and +5V supply tolerance suit automotive body-electronics and telemetry modules reading 0-5V sensor outputs (MAP, MAF, throttle position, oil pressure, battery current shunt amps). With 400 ksps throughput and 8 input channels, the device handles multiple sensor channels with adequate margin for engine-control and dashboard telemetry sampling. Designers should be aware that the MAX1090BEEI is not AEC-Q100 qualified and is Obsolete - new automotive designs should use the AEC-Q100-qualified MAX11131 or TI ADS7038 family. The MAX1090BEEI remains useful for retrofit, hobbyist, and non-safety automotive applications where qualification and long-term support are not critical.
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추천 제품 요약
엔지니어링 참조 데이터: MAX1090BEEI — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX1090AEEI | MAX1090BCEI+ | MAX1090ACEI+ | ADS901E/1K |
|---|---|---|---|---|---|
| Package | 28-QSOP | 28-QSOP (same) | 28-QSOP (same) | 28-QSOP (same) | 28-QSOP (same) |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Texas Instruments |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 100 ksps (slower) |
| Channels (single-ended) | 8 | 8 | 8 | 8 | 1 (single channel) |
| Supply Voltage | +5V | +5V | +5V | +5V | +5V |
| Internal Reference | +2.5V (yes) | +2.5V (yes) | +2.5V (yes) | +2.5V (yes) | External required |
| Interface | Byte-wide parallel | Byte-wide parallel | Byte-wide parallel | Byte-wide parallel | Parallel (different pinout detail) |
주요 차별점
- Integrated +2.5V reference eliminates external reference IC (vs ADS901E/1K (TI))
- Automatic hardware power-down with 2 µs wake-up (vs MAX1071 series / older discrete ADCs)
- 8 single-ended / 4 differential channels in single 28-QSOP (vs ADS901E/1K (single-channel TI ADC))
설계 노트
The MAX1090BEEI requires a clean +5V analog supply on AVDD (pin 11) and a separate +5V digital supply on DVDD (pin 28). Place a 10 µF tantalum and a 0.1 µF ceramic decoupling capacitor as close as possible to each supply pin. Use a ferrite bead or small inductor between AVDD and DVDD to prevent digital switching noise from coupling into the analog section. The analog and digital grounds should be tied together at a single point under the IC to avoid ground loops.
Route analog input traces (AIN0-AIN7) as short as possible and shield them with analog ground on both sides. Keep digital outputs (D0-D7) and control lines (RD, WR, CS, INT) routed on the opposite side of the IC from the analog inputs. Place the reference bypass capacitor (typically 0.1 µF ceramic in parallel with 1 µF) directly on the REF pin (pin 10). The MAX1090 datasheet recommends a star-ground topology where AGND and DGND meet under the IC.
The MAX1090BEEI is Obsolete as of the latest distributor data. Do not design it into new production boards without confirming long-term procurement. If an existing design needs to replace failed units, MAX1090AEEI+ is the recommended drop-in. Note that MODE pin configuration selects unipolar (0 to VREF*2) or bipolar (-VREF to +VREF) input ranges - mis-wiring MODE causes incorrect conversion results. The PD pin must be tied low (or driven low) for normal operation; leaving it floating may cause intermittent operation.
When reading the parallel output bus at full 400 ksps, ensure the host MCU/FPGA data bus has sufficient setup/hold margin to the RD signal (active low). Add 10-20 kΩ pull-up resistors on D0-D7 if the host bus is shared with slow peripherals. For multi-channel scanning, insert 1 µs settling time between channel switches - this is internal to the MAX1090's MUX. Reading the INT pin (active low) instead of polling avoids host-side timing jitter.
규정 준수 정보
RoHS compliance status not confirmed in verified web data - the '+' suffix variant (MAX1090BEEI+) is typically RoHS compliant per Maxim convention. Part is not AEC-Q100 qualified for automotive. Lifecycle status is Obsolete per DigiKey distributor data.
