MAX1178BCUP+ - 16-Bit 135ksps Bipolar ADC ±5V | Maxim Integrated
부품 번호: MAX1178BCUP+ ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $21.5 | $21.50 |
| 10 | $19.4 | $194.00 |
| 100 | $16.85 | $1,685.00 |
| 500 | $14.95 | $7,475.00 |
| 1,000 | $13.4 | $13,400.00 |
MAX1178BCUP+ 개요
A SAR ADC is a successive-approximation-register converter, a category of medium-speed, low-latency analog-to-digital converters that perform one conversion per sample clock by stepping an internal DAC against the input through a binary-search algorithm. SAR ADCs sit between delta-sigma ADCs (which offer higher resolution at lower speed) and flash ADCs (which offer maximum speed at lower resolution), and they are widely used in industrial control, instrumentation, and data-acquisition front-ends where deterministic latency matters.
Key features include ±5 V true bipolar input range on a single +4.2 V supply, automatic power-down that drops supply current to 0.4 mA at 10 ksps, 16-bit no-missing-codes performance, single-ended analog input with track-and-hold, and SPI/QSPI/MICROWIRE-compatible serial output. The MAX1178 family differs from the MAX1188 (±10 V input) and MAX1177 (±3 V input) by accepting the wider ±5 V bipolar input on the same TSSOP-20 footprint.
Typical applications include industrial process control, data-acquisition front-ends for ±5 V sensor signals, weigh scales, vibration and motion analysis, and portable or battery-powered instrumentation. The AutoShutdown feature reduces system power by more than 90% in between-sample idle windows.
When designing with this ADC, pay attention to the input clamping network for over-voltage protection and the reference decoupling scheme - the internal reference requires a low-ESR bypass cap of 4.7 µF or larger. For full ±5 V input swing, an external negative rail or a bipolar-input drive circuit is required at the analog input pin.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes for the MAX1178BCUP+ that are not contained in the manufacturer datasheet alone.
드롭인 대체품: MAX1178BCUP+ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX1178BCUP+ (동일 폼 팩터 및 풋프린트) — 차이점: Resolution.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX1178BCUP+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1178ACUP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1177CCUP+T
✅ 드롭인✓ 재고 있음
$7.4 / 개
데이터시트 보기 →MAX1188BCUP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1081BCUP+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC1865ACMS
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1178BCUP+ 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Number of Inputs | 1 |
| Converter Type | SAR (Successive Approximation) |
| 샘플링 속도 | 135 ksps |
| Analog Input Range (Bipolar) | ±5 V |
| Supply Voltage (Analog) | +4.2 V nominal |
| Internal Reference Voltage | +4.096 V |
| Power Consumption (External Ref, 135 ksps) | 26.5 mW typ |
| Power Consumption (Internal Ref, 135 ksps) | 31 mW typ |
| AutoShutdown Current | 0.4 mA at 10 ksps |
| 인터페이스 | SPI / QSPI / MICROWIRE serial |
| Input Configuration | Single-ended with track-and-hold |
| 패키지 | 20-TSSOP (4.40 mm) |
| RoHS 상태 | Compliant |
| Clock | Internal factory-trimmed |
MAX1178BCUP+ 핀 구성
| 핀 1 | AVDD — Analog supply voltage (+4.2 V nominal) |
| 핀 2 | AIN — Analog input, bipolar ±5 V |
| 핀 3 | REF — Reference input/output |
| 핀 4 | AGND — Analog ground |
| 핀 5 | DGND — Digital ground |
| 핀 6 | DOUT — Serial data output |
| 핀 7 | SSTRB — Serial strobe output |
| 핀 8 | CS — Chip select, active low |
| 핀 9 | SCLK — Serial clock input |
| 핀 10 | DVDD — Digital supply voltage |
| 핀 11 | NC — Not connected (per datasheet) |
| 핀 12 | NC — Not connected (per datasheet) |
| 핀 13 | NC — Not connected (per datasheet) |
| 핀 14 | NC — Not connected (per datasheet) |
| 핀 15 | NC — Not connected (per datasheet) |
| 핀 16 | NC — Not connected (per datasheet) |
| 핀 17 | NC — Not connected (per datasheet) |
| 핀 18 | NC — Not connected (per datasheet) |
| 핀 19 | NC — Not connected (per datasheet) |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
MAX1178BCUP+ 적합 용도: 7 애플리케이션s: Industrial Process Control, Data Acquisition Systems, Weigh Scales and Force Measurement, Vibration and Motion Analysis, Portable Battery-Powered Instrumentation, Medical Patient Monitoring, Audio Bandwidth Digital Sampling.
Industrial Process Control
The MAX1178BCUP+ is well-suited for industrial process-control front-ends that digitize ±5 V analog signals from PLCs, transducers and 4-20 mA loop receivers (after resistor scaling). Its 16-bit resolution across ±5 V gives 152 µV per LSB, sufficient to resolve small process-variable changes without front-end gain stages. The AutoShutdown feature cuts supply current to 0.4 mA at 10 ksps, enabling multi-channel multiplexed systems where only one ADC is sampled at a time. The internal +4.096 V reference simplifies the BOM count and PCB area.
추천
Data Acquisition Systems
For multi-channel data-acquisition boards, the MAX1178BCUP+ provides a compact, low-power single-channel SAR ADC with SPI serial output that easily daisy-chains to a microcontroller or FPGA. The 135 ksps throughput handles most industrial and instrumentation sampling requirements, while the internal factory-trimmed clock removes the need for an external clock source. Combined with an external MUX like the MAX4638, this ADC supports up to 8-32 channels in a compact footprint with deterministic latency from the SAR architecture.
추천
Weigh Scales and Force Measurement
Weigh-scale and force-measurement systems require 16-bit (or better) resolution to span the load-cell dynamic range, and the MAX1178BCUP+ delivers that with ±5 V input to match typical bridge-amplifier outputs. The 135 ksps rate is more than enough for 100 Hz scale settling rates, leaving timing headroom for digital filtering and temperature drift compensation. The internal reference reduces BOM cost and improves temperature stability compared to most external shunt references.
추천
Vibration and Motion Analysis
Vibration and motion-analysis front-ends need medium sampling rates (50-100 ksps per channel) with low latency, which is exactly what the MAX1178BCUP+ SAR architecture provides. The SPI interface allows the ADC to be placed close to MEMS accelerometers or IEPE piezoelectric sensors without long analog traces, reducing EMI. Combined with anti-alias filters placed at the ADC input pin, this part supports three or four channels of motion data at 50 ksps each from a single ADC and external MUX.
추천
Portable Battery-Powered Instrumentation
Portable, battery-powered instruments benefit from the MAX1178BCUP+ AutoShutdown mode, which drops supply current to 0.4 mA at 10 ksps - a 90% reduction versus continuous conversion. The single +4.2 V analog supply runs directly from a single lithium-ion cell, eliminating split-rail DC-DC converters in handheld multimeters, data loggers and field instruments. The internal clock further reduces BOM cost and standby power. The 20-TSSOP footprint keeps the ADC small enough to fit in handheld enclosures.
추천
Medical Patient Monitoring
Patient monitoring and diagnostic equipment require deterministic latency for waveform capture, and the MAX1178BCUP+ SAR architecture provides sample-on-demand conversion with no pipeline delay. Its ±5 V bipolar input matches the output range of ECG, EEG and pulse-oximeter front-ends. The internal +4.096 V reference keeps calibration stable over the device's commercial temperature range, which is sufficient for bedside monitors. SPI output streams data directly into the host MCU for heart-rate, SpO2 and temperature algorithms.
추천
Audio Bandwidth Digital Sampling
Audio-bandwidth digital sampling systems (digital-crossover, room-correction, and effects processors) can use the MAX1178BCUP+ for >90 dB SNR analog-to-digital conversion at 135 ksps, sufficient for 48 kHz and 96 kHz audio sample rates. The ±5 V input accommodates professional +4 dBu and -10 dBV consumer audio line levels after a fixed gain stage. The internal reference gives low-jitter, low-noise performance that preserves audio dynamic range without the cost of an external audio-grade reference.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX1178BCUP+ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX1178BCUP+T | MAX1178ACUP+ | MAX1177CCUP+T | MAX1188BCUP+ | MAX1081BCUP+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 20-TSSOP | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same | 20-TSSOP - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit |
| Internal Reference | +4.096 V | +4.096 V | +4.096 V | +2.5 V | +4.096 V | +2.5 V |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | Serial |
주요 차별점
- True bipolar ±5 V input on a single +4.2 V supply (vs MAX1167 (single-supply, unipolar))
- 135 ksps throughput with AutoShutdown (vs MAX1162 (200 ksps, no AutoShutdown))
- Pin-compatible family for ±3 V / ±5 V / ±10 V ranges (vs AD7606 (different package, simultaneous sampling))
설계 노트
The MAX1178BCUP+ runs on a single +4.2 V analog supply and supports AutoShutdown that brings supply current down to 0.4 mA at 10 ksps. Decouple AVDD and DVDD separately at the IC pins with a 10 µF tantalum in parallel with a 0.1 µF ceramic. The internal +4.096 V reference requires at least 4.7 µF of low-ESR capacitance on the REF pin; less capacitance causes excessive reference noise and degraded AC performance.
For full ±5 V bipolar input swing, the analog input must be biased to the midpoint of the ADC's input common-mode range - typically achieved with an input driver op-amp that swings around AVDD/2. Add a small RC anti-alias filter (typically 100 Ω + 1 nF) right at the AIN pin to limit out-of-band noise. Keep analog input traces away from digital clock and serial data lines to avoid digital noise coupling into the analog front-end.
Do not assume the MAX1178's ±5 V input is true bipolar at the pin - the bipolar range is implemented on a single +4.2 V analog supply, so the input signal must be biased to AVDD/2 externally. Forgetting this level shift is the #1 cause of clipped or distorted output codes. Also confirm that SSTRB timing is respected in SPI firmware - early SCLK toggles during conversion can corrupt the SAR state machine.
Use a separate analog ground plane tied to a single point at the AGND pin to avoid ground-loop noise. Place REF decoupling cap directly at the REF pin with short, wide traces. Route AIN as a guarded trace surrounded by AGND to reject common-mode pickup. The CS, SCLK, and DOUT lines should be 50 Ω-controlled-impedance traces if longer than ~25 mm to the host MCU.
규정 준수 정보
RoHS and lead-free per Maxim Integrated product marking. Halogen-free status not specified in retrieved data.
