MAX115CAX - 12-Bit 2x4-Channel Simultaneous-Sampling ADC | Maxim
MPN: MAX115CAX ✗ Cuối đờiMAX115CAX Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX115CAX — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX115CAX (cùng hình factor và footprint) — khác nhau ở Package.
MAX115CAX+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX115EAX
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX115CAX-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX115CEAX
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX115CAX+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX115CAX Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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 |
| Hộp | 36-SSOP |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân MAX115CAX
| Chân 1 | CH1+ — Channel 1 positive analog input |
| Chân 2 | CH1- — Channel 1 negative analog input |
| Chân 3 | CH2+ — Channel 2 positive analog input |
| Chân 4 | CH2- — Channel 2 negative analog input |
| Chân 5 | AGND — Analog ground |
| Chân 6 | CH3+ — Channel 3 positive analog input |
| Chân 7 | CH3- — Channel 3 negative analog input |
| Chân 8 | CH4+ — Channel 4 positive analog input |
| Chân 9 | CH4- — Channel 4 negative analog input |
| Chân 10 | AGND — Analog ground |
| Chân 11 | MUX0 — Multiplexer select 0 (auxiliary input A/B selection) |
| Chân 12 | MUX1 — Multiplexer select 1 |
| Chân 13 | AVDD — Analog supply voltage |
| Chân 14 | AVDD — Analog supply voltage |
| Chân 15 | AVSS — Analog negative supply |
| Chân 16 | REF — +2.5V reference input/output |
| Chân 17 | REFGND — Reference ground |
| Chân 18 | DVDD — Digital supply voltage |
| Chân 19 | DGND — Digital ground |
| Chân 20 | CONVST — Conversion start (active low) |
| Chân 21 | RD — Read strobe (active low) |
| Chân 22 | CS — Chip select (active low) |
| Chân 23 | INT — Interrupt output (active low) |
| Chân 24 | PD — Power-down mode (active high) |
| Chân 25 | D0 — Data bit 0 (LSB) |
| Chân 26 | D1 — Data bit 1 |
| Chân 27 | D2 — Data bit 2 |
| Chân 28 | D3 — Data bit 3 |
| Chân 29 | D4 — Data bit 4 |
| Chân 30 | D5 — Data bit 5 |
| Chân 31 | D6 — Data bit 6 |
| Chân 32 | D7 — Data bit 7 |
| Chân 33 | D8 — Data bit 8 |
| Chân 34 | D9 — Data bit 9 |
| Chân 35 | D10 — Data bit 10 |
| Chân 36 | D11 — Data bit 11 (MSB) |
Ứng dụng tiêu biểu
MAX115CAX phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX115CAX — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Simultaneous-sampling T/H topology for phase-coherent acquisition (vsMAX115CAX+T)
- Extended-temperature grade option for industrial deployments (vsMAX115EAX)
- RoHS lead-free ordering code for regulated-market compliance (vsMAX115CAX+)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
