MAX149BMAP/PR - 10-Bit 8-Ch 133ksps SAR ADC | Maxim Integrated
부품 번호: MAX149BMAP/PR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.92 | $18.92 |
| 10 | $17.4 | $174.00 |
| 100 | $15.65 | $1,565.00 |
| 500 | $13.95 | $6,975.00 |
| 1,000 | $12.42 | $12,420.00 |
MAX149BMAP/PR 개요
An SAR ADC is a type of data converter that uses a binary-search successive-approximation algorithm to convert an analog input to a digital code one bit at a time per clock cycle. In the broader taxonomy, a SAR ADC sits under ADC -> data converter -> mixed-signal IC -> semiconductor. The MAX149 integrates an 8-input analog multiplexer, a wide-bandwidth track-and-hold, a precision DAC, and a serial interface, providing a complete data-acquisition front-end in a single IC.
Key features of this part include an aggregate throughput of 133 ksps, an internal 2.5V bandgap reference (versus the external reference required on the pin-compatible MAX148), hardware SHDN and software-controllable power-down modes, an automatic end-of-conversion shutdown mode, ±1.5% reference-buffer trim, and SPI/QSPI/MICROWIRE-compatible serial I/O. The /PR suffix designates the Tape & Reel packaging and the military (M) operating temperature grade of -55C to +125C.
Architecturally, the device combines an input MUX and T/H front-end that acquires input signals in less than 1.5 acquisition-time clock cycles, followed by a charge-redistribution SAR core clocked either from the internal oscillator or from an external serial-interface clock. The internal reference uses a low-drift bandgap trimmed for ±1.5% absolute accuracy.
Typical applications include portable data loggers, multi-channel industrial sensor monitoring (4-20 mA loops, thermocouples, RTDs, strain gauges), battery-powered instrumentation, medical patient-monitoring equipment, and process-control front-ends where low power and small footprint matter.
Design consideration: place a 10 µF bypass capacitor on REF and a 0.1 µF ceramic on VDD as close to the pins as possible; when an external reference is required for higher absolute accuracy, the MAX148 is the pin-compatible drop-in alternative in the same family.
This page synthesizes distributor pricing, parametrically verified drop-in alternatives, and practical design notes for the MAX149BMAP/PR not found in the standalone manufacturer datasheet.
드롭인 대체품: MAX149BMAP/PR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX149BMAP/PR+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149BMAP/PR3
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149BMAP/PR3+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149ACAP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149BCAP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149AEAP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX149BMAP/PR 최대 정격 & 전기적 특성
| 분해능 | 10 bit |
| Number of Input Channels | 8 single-ended or 4 differential |
| Conversion Architecture | Successive Approximation (SAR) |
| 샘플링 속도 | 133 ksps |
| 공급 전압 | +2.7 V to +5.25 V (single) |
| Internal Reference Voltage | 2.5 V |
| Reference Buffer Trim Range | ±1.5 % |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| Input MUX Configuration | 8:1 single-ended or 4:1 differential |
| Shutdown Mode | Hardware SHDN + software power-down + auto end-of-conversion |
| 동작 온도 범위 | -55 C to +125 C (military grade) |
| 패키지 | 20-pin SSOP (5.30 mm body) |
| Package Code | TSSOP / SSOP-20 (PDSO20) |
| Terminal Form | Gull Wing (SMT) |
| 실장 유형 | Surface Mount |
MAX149BMAP/PR 핀 구성
| 핀 1 | CH0 — Analog input channel 0 |
| 핀 2 | CH1 — Analog input channel 1 |
| 핀 3 | CH2 — Analog input channel 2 |
| 핀 4 | CH3 — Analog input channel 3 |
| 핀 5 | CH4 — Analog input channel 4 |
| 핀 6 | CH5 — Analog input channel 5 |
| 핀 7 | CH6 — Analog input channel 6 |
| 핀 8 | CH7 — Analog input channel 7 |
| 핀 9 | AGND — Analog ground |
| 핀 10 | REFADJ — Reference adjust input |
| 핀 11 | REF — Reference voltage I/O (internal 2.5 V) |
| 핀 12 | SHDN — Hardware shutdown (active low) |
| 핀 13 | CS — Active-low chip-select input |
| 핀 14 | DOUT — Serial data output |
| 핀 15 | SCLK — Serial clock input |
| 핀 16 | DIN — Serial data input |
| 핀 17 | DGND — Digital ground |
| 핀 18 | AVDD — Analog +2.7 V to +5.25 V supply |
| 핀 19 | DVDD — Digital supply (tied to AVDD) |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
MAX149BMAP/PR 적합 용도: 6 애플리케이션s: Portable Data Logger, Industrial Process Control Sensor Front-End, Medical Patient Monitoring Equipment, Battery-Powered Instrumentation, Automotive Sensor Cluster, Multi-Channel PLC Analog Input Module.
Portable Data Logger
The MAX149BMAP/PR is well suited to battery-powered multi-channel data loggers thanks to its 8 single-ended inputs, integrated 2.5 V reference and software-controllable power-down that drops quiescent current to a few microamps between conversions. With a 133 ksps SAR core and SPI-compatible serial output, it can capture temperature, pressure and battery-voltage sensors at sample rates above 1 kHz per channel, while the small SSOP-20 footprint preserves PCB real estate. Place a 0.1 µF bypass on VDD within 7 mm of the pin and a 10 µF tantalum on REF to meet datasheet noise and linearity specifications.
추천
Industrial Process Control Sensor Front-End
In 4-20 mA loop, thermocouple and strain-gauge conditioning front-ends, the MAX149BMAP/PR accepts up to 8 differential or single-ended analog channels through its internal MUX, providing 10-bit conversion at 133 ksps aggregate throughput. The -55 °C to +125 °C military-grade operating range of the /PR variant allows deployment in outdoor, factory-floor and downhole instrumentation. The internal 2.5 V reference with ±1.5 % trim range can drive ratiometric bridge measurements, while the 8:1 MUX reduces external analog-switch cost. Differential inputs reject common-mode noise from motor drives and switching power stages.
추천
Medical Patient Monitoring Equipment
For multi-parameter patient monitors (ECG, SpO2, respiration, temperature, NIBP), the MAX149BMAP/PR provides 8 single-ended channels that multiplex slowly varying bioelectric signals into a single SAR ADC, minimizing BOM cost. The 133 ksps aggregate throughput allows oversampling of ECG leads for digital filtering, while the internal 2.5 V reference simplifies isolation-amplifier output digitisation. Hardware SHDN plus auto end-of-conversion power-down maximise battery life on portable units; the military-grade -55 °C to +125 °C range supports both clinical and field-monitor housings.
추천
Battery-Powered Instrumentation
In handheld digital multimeters, portable gas analysers and field instruments, the MAX149BMAP/PR's 1.4 mA operating current (typical) plus sub-microamp shutdown mode extend battery life substantially versus discrete ADCs. The internal 2.5 V reference can serve as a system reference for the rest of the analogue signal chain, removing an extra IC. SPI/QSPI/MICROWIRE compatibility simplifies connection to low-power microcontrollers such as the MAXQ family. The wide +2.7 V to +5.25 V supply range accepts 3-cell alkaline, single-cell Li-ion and USB-powered rails without additional regulation.
추천
Automotive Sensor Cluster
Body and chassis electronic modules (seat-position sensors, climate-control thermistors, fuel-level, ambient-light and battery-monitoring inputs) can use the MAX149BMAP/PR's 8-channel MUX to consolidate analog signals into a single ADC interface with SPI output to a small MCU. Although the /PR military variant is not AEC-Q100 qualified, the same MAX149 core is available in AEC-Q100 automotive grades. The 133 ksps throughput handles 10 Hz to 1 kHz body-electronics update rates easily, while the internal 2.5 V reference eliminates the need for an extra voltage reference IC on tight BOMs.
추천
Multi-Channel PLC Analog Input Module
Programmable Logic Controller (PLC) analog input cards typically require 4, 8 or 16 channels of analog-to-digital conversion with SPI isolation. The MAX149BMAP/PR provides 8 single-ended or 4 differential inputs, and two devices can be cascaded using CS lines to deliver 16 channels from a single SPI port. The internal 2.5 V reference simplifies design; the /PR -55 °C to +125 °C grade supports the -40 °C industrial temperature window with margin. Combined with a digital isolator such as MAX1480 or a SPI-isolator IC, it forms a robust, low-cost isolated analog front-end.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX149BMAP/PR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX149BMAP/PR+ | MAX149BMAP/PR3 | MAX149ACAP+ | MAX149BCAP+ | MAX149AEAP+ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 20-SSOP (5.30 mm) | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same | 20-SSOP (5.30 mm) - same |
| Resolution | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit | 10 bit |
| Sampling Rate | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps |
| Number of Channels | 8 single-ended / 4 differential | 8 SE / 4 DI | 8 SE / 4 DI | 8 SE / 4 DI | 8 SE / 4 DI | 8 SE / 4 DI |
| Internal Reference | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal | 2.5 V internal |
| Supply Voltage | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V | +2.7 V to +5.25 V |
| Operating Temperature | -55 C to +125 C (military) | -55 C to +125 C | -55 C to +125 C | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (extended industrial) |
주요 차별점
- Internal 2.5 V reference vs external reference (vs MAX148AEPP+)
- Military-grade temperature rating (vs MAX149ACAP+)
- Hardware SHDN plus auto end-of-conversion power-down (vs MAX149BMAP/PR+)
설계 노트
Estimated: bypass AVDD and DVDD with a 0.1 µF ceramic placed within 7 mm of the supply pins, and add a 10 µF tantalum bypass on REF. The MAX149 integrates a software-controllable power-down that drops quiescent current to single-digit microampere levels between conversions; combine with hardware SHDN tied high through a 100 kΩ pull-up for predictable reset behaviour at power-up.
Keep AGND and DGND star-connected at the chip body; route the analog input traces as differential pairs with guard traces tied to AGND to minimise channel-to-channel crosstalk at 133 ksps. Place the REF capacitor ground via directly back to AGND, not DGND, to avoid digital switching noise coupling into the reference. Series resistance above 1 kΩ on analog inputs degrades acquisition time - keep source impedances below 600 Ω.
Do not leave unused analog inputs floating - tie them to AGND to prevent pickup on the MUX. When using the differential mode, ensure the negative input is driven from a low-impedance source; floating differential inputs corrupt common-mode rejection. The internal 2.5 V reference is not designed to sink current; if you must drive external circuitry from REF, buffer it externally.
Estimated: at 133 ksps the SPI bus toggles at ~16 MHz on SCLK for 10-bit frames; route SCLK/DOUT/CS traces over a continuous ground plane and add a 33 Ω series damping resistor if the trace exceeds 25 mm. Keep digital traces away from analog MUX inputs to prevent capacitive coupling.
규정 준수 정보
The /PR suffix denotes a military-grade temperature variant; RoHS/REACH status was not present in the verified web data, so compliance is marked as unknown. For RoHS-compliant versions use the /PR+ (lead-free) variant. AEC-Q100 automotive grade is not available on the /PR; consult Maxim/Analog Devices automotive-product line for AEC-Q100 equivalents.
