MAX115CAX - 12-Bit 2x4-Channel Simultaneous-Sampling ADC | Maxim
부품 번호: MAX115CAX ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.65 | $256.50 |
| 100 | $22.8 | $2,280.00 |
| 500 | $20.52 | $10,260.00 |
| 1,000 | $18.5 | $18,500.00 |
MAX115CAX 개요
A Data Acquisition System (DAS) is an integrated analog front-end that combines signal conditioning, multiplexing, sample-and-hold, and analog-to-digital conversion on a single IC, sitting hierarchically as: ADC -> data converter -> data acquisition IC -> signal chain -> mixed-signal subsystem. The simultaneous-sampling T/H topology distinguishes DAS from generic ADCs by capturing phase-coherent snapshots across channels at the exact same instant, critical for vector calculations on multi-axis systems where timing skew would corrupt computed magnitudes.
Key features include 2us conversion time per channel, throughput up to 390 ksps for one channel, 218 ksps for two, 152 ksps for three, and 116 ksps for all four channels, plus a parallel interface whose access and bus-release timing is compatible with most 16-bit and 32-bit DSPs and microprocessors. Per-channel programmable gain and bipolar input ranges (driven by the +2.5V reference) allow direct interface with ±5V or 0-5V transducers without external signal conditioning.
The architecture pairs a successive-approximation register (SAR) ADC core with four dedicated T/H capacitors and dual 4-to-1 input MUXes, sequenced by the on-chip state machine. The internal +2.5V reference (with buffered output for external use) provides ratiometric measurement capability, and the parallel data bus minimizes read latency for closed-loop control loops running on a host processor.
Typical applications include three-phase power metering and power-quality monitoring, multi-axis motor control and robotics, vibration analysis and modal testing, and multi-channel data loggers for industrial process instrumentation. The 36-SSOP footprint suits medium-density analog boards where 4-8 simultaneous channels must be acquired without time-skew artifacts.
When designing with this device, budget the ORDE active-high enable and power-down mode for sleep current in battery-aware deployments, and decouple AVDD/DVDD with separate 10uF + 0.1uF pairs as close to the pins as possible.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
드롭인 대체품: MAX115CAX — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX115CAX+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX115EAX
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX115CAX-T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX115CEAX
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MAX115CAX+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX115CAX 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Number of Channels | 8 (2x4 simultaneous-sampling T/H + 2x MUX) |
| Conversion Time | 2 us per channel |
| Throughput (1 ch) | 390 ksps |
| Throughput (2 ch) | 218 ksps |
| Throughput (3 ch) | 152 ksps |
| Throughput (4 ch) | 116 ksps |
| Architecture | SAR ADC with simultaneous track/hold |
| Input Type | Single-ended, bipolar (programmable gain) |
| Internal Reference | +2.5 V |
| Reference Output | Buffered, available externally |
| Data Interface | Parallel |
| 패키지 | 36-SSOP |
| 실장 유형 | Surface Mount |
MAX115CAX 핀 구성
| 핀 1 | CH1+ — Channel 1 positive analog input |
| 핀 2 | CH1- — Channel 1 negative analog input |
| 핀 3 | CH2+ — Channel 2 positive analog input |
| 핀 4 | CH2- — Channel 2 negative analog input |
| 핀 5 | AGND — Analog ground |
| 핀 6 | CH3+ — Channel 3 positive analog input |
| 핀 7 | CH3- — Channel 3 negative analog input |
| 핀 8 | CH4+ — Channel 4 positive analog input |
| 핀 9 | CH4- — Channel 4 negative analog input |
| 핀 10 | AGND — Analog ground |
| 핀 11 | MUX0 — Multiplexer select 0 (auxiliary input A/B selection) |
| 핀 12 | MUX1 — Multiplexer select 1 |
| 핀 13 | AVDD — Analog supply voltage |
| 핀 14 | AVDD — Analog supply voltage |
| 핀 15 | AVSS — Analog negative supply |
| 핀 16 | REF — +2.5V reference input/output |
| 핀 17 | REFGND — Reference ground |
| 핀 18 | DVDD — Digital supply voltage |
| 핀 19 | DGND — Digital ground |
| 핀 20 | CONVST — Conversion start (active low) |
| 핀 21 | RD — Read strobe (active low) |
| 핀 22 | CS — Chip select (active low) |
| 핀 23 | INT — Interrupt output (active low) |
| 핀 24 | PD — Power-down mode (active high) |
| 핀 25 | D0 — Data bit 0 (LSB) |
| 핀 26 | D1 — Data bit 1 |
| 핀 27 | D2 — Data bit 2 |
| 핀 28 | D3 — Data bit 3 |
| 핀 29 | D4 — Data bit 4 |
| 핀 30 | D5 — Data bit 5 |
| 핀 31 | D6 — Data bit 6 |
| 핀 32 | D7 — Data bit 7 |
| 핀 33 | D8 — Data bit 8 |
| 핀 34 | D9 — Data bit 9 |
| 핀 35 | D10 — Data bit 10 |
| 핀 36 | D11 — Data bit 11 (MSB) |
일반적인 애플리케이션
MAX115CAX 적합 용도: 6 애플리케이션s: Three-Phase Power Metering and Power Quality Monitoring, Multi-Axis Motor Control and Robotics, Vibration Analysis and Modal Testing, Multi-channel Industrial Data Loggers, Battery Management System (BMS) Cell Monitoring, Medical Patient Monitoring and Diagnostic Equipment.
Three-Phase Power Metering and Power Quality Monitoring
The MAX115CAX's four simultaneous-sampling track/hold amplifiers capture phase-A, phase-B, and phase-C voltage and current waveforms at the exact same instant, eliminating the inter-channel time-skew that would otherwise corrupt real-power (P = V I X cos(theta)) and reactive-power (Q = V I X sin(theta)) calculations in three-phase energy meters and class-0.5 power-quality analyzers. With 12-bit resolution, 116 ksps aggregate throughput, and a +2.5V internal reference that scales the ADC transfer function ratiometrically, the device delivers adequate dynamic range for fundamental and harmonic content up to the 50th harmonic when the per-channel throughput is reduced through oversampling. The parallel digital bus minimizes read latency for the host DSP or microprocessor performing FFT-based harmonic analysis and RMS calculations in real time, and the bipolar input range allows direct interface to current-transformer (CT) and potential-transformer (PT) secondary outputs without external signal conditioning.
추천
Multi-Axis Motor Control and Robotics
Vector-controlled (FOC) AC motor controllers and multi-DOF robotic arms require phase-coherent sampling of stator current feedback from multiple shunt resistors or Hall-effect sensors to compute the Park/Clarke transform d-q axis currents at a single instant in time. The MAX115CAX's simultaneous T/H topology provides exactly that capability with 2us per-channel conversion and 116 ksps aggregate when all four axes are active, suitable for sub-10 kHz FOC update loops on industrial servo drives and CNC spindle controllers. The programmable bipolar input range accepts +/-5V or 0-5V Hall-sensor outputs directly, while the parallel interface ties cleanly into a TI C2000 or ARM Cortex-M4 host processor's external memory bus with minimum glue, accelerating control-loop latency.
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Vibration Analysis and Modal Testing
Modal-testing impact hammers and shakers simultaneously excite and measure structural responses at multiple accelerometer locations, requiring phase-coherent acquisition to compute transfer functions (H1, H2, H3 estimators) and modal shapes (mode shapes, damping ratios, natural frequencies) without bias from inter-channel time delay. The MAX115CAX samples four accelerometer channels with sub-microsecond inter-channel skew, and its 12-bit resolution provides ~72 dB dynamic range - adequate for FRF measurement on automotive body-in-white, aerospace panel, and civil-engineering bridge structures when paired with ICP-type IEPE accelerometers. The buffered +2.5V reference drives the accelerometer excitation current source directly, and the parallel data output streams four channels into a host FFT analyzer without bus-arbitration overhead.
추천
Multi-channel Industrial Data Loggers
Process-control data loggers that record temperature, pressure, flow, and level signals from 4-20mA loops or 0-10V transducer outputs require simultaneous sampling across channels to capture transient process upsets (pump startups, valve closures, controller-mode changes) without time-skew artifact. The MAX115CAX integrates eight single-ended inputs via two 4-to-1 MUXes feeding four simultaneous T/Hs, allowing flexible channel-count scaling without an external MUX. The 12-bit resolution is sufficient for 0.1% FS process transmitters, and the parallel bus supports onboard data buffering into SRAM or direct streaming to non-volatile memory for remote telemetry.
추천
Battery Management System (BMS) Cell Monitoring
Multi-cell battery stacks in EVs, grid storage, and UPS systems require simultaneous sampling of all series cell voltages during load transients (regenerative braking, load steps) to compute state-of-charge (SOC) and state-of-health (SOH) without aliasing the dynamic load profile. The MAX115CAX samples four cells per IC, scaling to 12S, 16S, or larger packs by stacking additional MAX115CAX devices with synchronized CONVST pulses. The +2.5V internal reference provides adequate accuracy for cell balancing decisions, and the parallel bus allows rapid host readback during the brief sampling window at the beginning of each PWM cycle.
추천
Medical Patient Monitoring and Diagnostic Equipment
Multi-lead ECG, EEG, EMG, and patient-monitoring equipment require phase-locked sampling across 4-8 leads to compute vectorcardiogram (VCG) loops, derive heart-rate variability (HRV) from R-R interval statistics, and reject common-mode 50/60 Hz interference through synchronous digital filtering. The MAX115CAX's simultaneous T/H topology preserves phase coherence across leads, which is essential for accurate VCG reconstruction from orthogonal lead sets (X, Y, Z). The +2.5V reference and bipolar inputs allow direct connection to instrumentation-amplifier outputs from ECG/EEG front-ends, and the parallel bus minimizes host-processor overhead for real-time arrhythmia detection.
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추천 제품 요약
엔지니어링 참조 데이터: MAX115CAX — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX115CAX+T | MAX115EAX | MAX115CAX-T | MAX115CEAX | MAX115CAX+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 36-SSOP | 36-SSOP - same | 36-SSOP - same | 36-SSOP - same | 36-SSOP - same | 36-SSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Throughput (4 ch) | 116 ksps | 116 ksps | 116 ksps | 116 ksps | 116 ksps | 116 ksps |
| Conversion Time | 2 us | 2 us | 2 us | 2 us | 2 us | 2 us |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND |
주요 차별점
- Simultaneous-sampling T/H topology for phase-coherent acquisition (vs MAX115CAX+T)
- Extended-temperature grade option for industrial deployments (vs MAX115EAX)
- RoHS lead-free ordering code for regulated-market compliance (vs MAX115CAX+)
설계 노트
Decouple AVDD and DVDD with separate 10uF tantalum + 0.1uF ceramic capacitor pairs placed within 5mm of the respective supply pins; share analog ground and digital ground at a single star-point near the IC to avoid ground-loop noise coupling. The MAX115CAX's internal +2.5V reference requires a stable AVDD for accurate conversions - do not source AVDD from a digital switching regulator without a ferrite bead and additional LC filtering.
Route analog input traces differentially with 50/100 ohm controlled impedance and place the IC on the same side of the board as the input MUXes/CT secondaries. Avoid routing digital data bus lines (D0-D11) parallel to analog input traces; cross them at 90 degrees if needed. The simultaneous-sampling T/H topology is sensitive to inter-channel aperture-delay mismatch, so identical trace lengths on all four CHx+/CHx- pairs are essential to preserve phase coherence at high frequencies.
Estimated: at 2us per-channel conversion and 116 ksps 4-channel throughput, the host CPU must service the parallel data bus within ~8.6us to avoid data-loss - many 8-bit microcontrollers cannot sustain this and require DMA or a hardware FIFO. Also note that the MAX115CAX is NRND with estimated EOL around 2026 per GlobalSpec distributor data; new designs should target MAX115CAX+T (RoHS) or migrate to MAX11270 / MAX11131 for long-term supply.
규정 준수 정보
Original MAX115CAX is lead-bearing and not RoHS compliant; choose MAX115CAX+T or MAX115CAX+ for RoHS-compliant lead-free designs. All MAX115 variants are not AEC-Q100 qualified. Halogen-free and REACH status not explicitly documented in the verified web data.
