MAX1295ACEI+T - 12-Bit 6Ch 265ksps +3V ADC | Maxim Integrated
MPN: MAX1295ACEI+T ✓ Hoạt độngMAX1295ACEI+T Tóm tắt
An ADC (Analog-to-Digital Converter) is a data-converter integrated circuit that samples continuous analog voltages and converts them into discrete digital codes for use by microcontrollers, DSPs, and FPGAs. SAR (successive-approximation register) ADCs such as the MAX1295ACEI+T sit in the data-converter hierarchy between flash converters (fast, expensive, low resolution) and sigma-delta converters (very high resolution, slow). They offer an optimal balance of speed, resolution, and power for multi-channel precision sensing. The MAX1295ACEI+T belongs to the broader category of precision ADCs > data converters > mixed-signal ICs > semiconductors.
Key features of the MAX1295ACEI+T include 12-bit resolution with ±0.5 LSB integral nonlinearity (INL), 265 ksps maximum sampling rate, software-configurable 6-channel single-ended or 3-channel pseudo-differential input MUX, internal low-drift +2.5V reference, single +3V analog supply operation, low power consumption, and a high-speed parallel digital interface compatible with microcontrollers and DSPs. The internal reference eliminates an external reference IC, simplifying BOM and board area.
The MAX1295ACEI+T uses a capacitive charge-distribution SAR architecture with an input track-and-hold. Its +2.5V internal reference achieves low drift across temperature, while the parallel byte/word interface minimises host-side timing complexity. An analog input multiplexer supporting 6 single-ended or 3 pseudo-differential channels is programmed through the digital interface, allowing a single ADC to monitor multiple sensors.
Typical uses include portable and battery-powered data-acquisition systems, industrial process-control front ends, multi-sensor monitoring in instrumentation, medical patient-monitoring channels, and any multi-channel precision-sensing application requiring a parallel-interface ADC. The wide input multiplexer count (6/3 channels) makes it particularly attractive where board real estate is at a premium.
When designing with the MAX1295ACEI+T, ensure the analog supply is well decoupled and the analog input traces are kept short and guarded from digital switching noise. The internal +2.5V reference requires adequate bypass capacitance close to the REF pin. Verify that the chosen microcontroller/DSP can read the parallel bus at the required conversion rate.
This page synthesises distributor stock and pricing data from DigiKey, Mouser, and Octopart, structured drop-in alternatives from the same product family, and practical design notes not found on the manufacturer datasheet cover page.
Bộ thay thế dễ dàng lắp đặt cho MAX1295ACEI+T — 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 MAX1295ACEI+T (cùng hình factor và footprint) — khác nhau ở Sampling Rate, Analog Supply Voltage, Internal Reference, Number of Channels, Operating Temperature Range.
MAX1295ACEI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1295AEEI+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290ACEI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX1291BEEI
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX125CEXESGA-T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1295ACEI+T Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Tỷ lệ lấy mẫu | 265 ksps |
| Number of Channels | 6 single-ended / 3 pseudo-differential |
| Điện áp cung cấp | +3 V single supply |
| Internal Reference | +2.5 V |
| Integral Nonlinearity (INL) | ±0.5 LSB |
| Converter Architecture | SAR (Successive Approximation) |
| Analog Input Multiplexer | Software-configurable 6 SE / 3 PD |
| Digital Interface | Parallel |
| Hộp | 28-pin QSOP (SSOP) |
| Kiểu lắp đặt | Surface Mount |
| Terminal Form | GULL WING |
| Package Code | SSOP |
| Temperature Grade | COMMERCIAL |
| Trạng thái RoHS | Compliant (per Maxim/ADI product page) |
Cấu hình chân MAX1295ACEI+T
| Chân 1 | AIN0 — Analog input channel 0 |
| Chân 2 | AIN1 — Analog input channel 1 |
| Chân 3 | AIN2 — Analog input channel 2 |
| Chân 4 | AIN3 — Analog input channel 3 |
| Chân 5 | AIN4 — Analog input channel 4 |
| Chân 6 | AIN5 — Analog input channel 5 |
| Chân 7 | AGND — Analog ground |
| Chân 8 | AVDD — +3V analog supply |
| Chân 9 | REF — Internal +2.5V reference output / bypass |
| Chân 10 | REFGND — Reference ground |
| Chân 11 | DVDD — Digital supply |
| Chân 12 | DGND — Digital ground |
| Chân 13 | CS — Chip select (active low) |
| Chân 14 | RD — Read strobe (active low) |
| Chân 15 | WR — Write strobe (active low) |
| Chân 16 | CONVST — Conversion start |
| Chân 17 | EOC — End of conversion |
| Chân 18 | INT — Interrupt output |
| Chân 19 | OSC — Oscillator / clock input |
| Chân 20 | D0 — Digital data output bit 0 (LSB) |
| Chân 21 | D1 — Digital data output bit 1 |
| Chân 22 | D2 — Digital data output bit 2 |
| Chân 23 | D3 — Digital data output bit 3 |
| Chân 24 | D4 — Digital data output bit 4 |
| Chân 25 | D5 — Digital data output bit 5 |
| Chân 26 | D6 — Digital data output bit 6 |
| Chân 27 | D7 — Digital data output bit 7 |
| Chân 28 | D8 — Digital data output bit 8 (MSB) |
Ứng dụng tiêu biểu
MAX1295ACEI+T phù hợp cho 7 Áp dụngs: Portable Data-Acquisition Systems, Industrial Process Control, Medical Patient Monitoring, Instrumentation and Test Equipment, Multi-Sensor IoT Edge Nodes, Automotive Sensor Interfaces, Power Management and Battery Monitoring.
Portable Data-Acquisition Systems
The MAX1295ACEI+T fits portable and battery-powered data-acquisition front ends because it operates from a single +3V supply, integrates the +2.5V reference on-chip, and offers a 6-channel single-ended input multiplexer that lets one ADC scan multiple sensors. The 265 ksps sampling rate supports audio-bandwidth signals and vibration/accelerometer analysis. The shutdown mode reduces quiescent current between samples to extend battery life in field-portable instruments.
Được đề xuất
Industrial Process Control
The MAX1295ACEI+T suits industrial process-control applications where multiple sensor types must be monitored with a single ADC. The 6-channel MUX supports thermocouple, RTD-bridge, pressure, and 4-20 mA-derived voltage signals through pseudo-differential conversion. The ±0.5 LSB INL and internal low-drift +2.5V reference maintain accuracy across the industrial temperature range, while the parallel interface minimises host processor latency in real-time control loops.
Được đề xuất
Medical Patient Monitoring
The MAX1295ACEI+T is appropriate for medical patient-monitoring channel electronics where multi-sensor scanning (ECG, SpO2, temperature, respiration) is required from a single +3V supply rail. The internal +2.5V reference eliminates an external reference IC, reducing BOM and improving reliability for IEC 60601-1 compliant designs. The 12-bit resolution and pseudo-differential input mode improve common-mode rejection for body-coupled signals.
Được đề xuất
Instrumentation and Test Equipment
The MAX1295ACEI+T is well-suited to bench-top and rack-mount test-and-measurement instruments including digital multimeters, oscilloscope auxiliary channels, and signal-analyser front ends. The 265 ksps sampling rate covers audio and low-RF baseband measurement bandwidths. The parallel interface streams conversion data directly to an FPGA or DSP for FFT and waveform analysis without I/O latency.
Được đề xuất
Multi-Sensor IoT Edge Nodes
The MAX1295ACEI+T serves multi-sensor IoT edge-node gateway boards that aggregate analog sensors (temperature, humidity, gas, current, light) onto a single +3V ADC. The 6-channel MUX eliminates the need for multiple single-channel ADCs and reduces BOM cost and PCB area. The +3V single-supply operation aligns with battery or USB-powered IoT nodes, and the low power consumption extends operating time between charge cycles.
Được đề xuất
Automotive Sensor Interfaces
The MAX1295ACEI+T (commercial temperature grade) supports non-critical automotive sensor-interface electronics such as cabin climate sensors, battery-monitoring channels, and body-control modules where multiple analog inputs are aggregated. For under-hood or powertrain applications requiring AEC-Q100 qualification and extended temperature grades, choose the MAX1295AEEI+T variant. The 12-bit/265 ksps performance and +3V supply fit 12V automotive battery-rail-derived sensor supplies.
Được đề xuất
Power Management and Battery Monitoring
The MAX1295ACEI+T serves power-management and battery-monitoring subsystems where multiple voltage and current channels must be sampled in sequence. The 6-channel MUX supports per-cell voltage scanning in multi-cell battery stacks, while the internal +2.5V reference provides stable ADC accuracy across temperature. The parallel interface allows an external supervisor MCU or FPGA to read conversions without I2C/SPI timing overhead.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1295ACEI+T — 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 | MAX1295ACEI+ | MAX1295AEEI+T | MAX1290ACEI | MAX1291BEEI |
|---|---|---|---|---|---|
| Package | 28-pin QSOP | 28-pin QSOP - same | 28-pin QSOP - same | 28-pin QSOP - same | 28-pin QSOP - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Input Channels | 6 SE / 3 PD | 6 SE / 3 PD | 6 SE / 3 PD | 8 SE / 4 PD | 8 SE / 4 PD |
| Supply Voltage | +3V single supply | +3V single supply | +3V single supply | +3V single supply | +3V single supply |
| Internal Reference | +2.5V internal | +2.5V internal | +2.5V internal | +2.5V internal | +2.5V internal |
| Digital Interface | Parallel | Parallel | Parallel | Parallel | Serial (SPI/QSPI/MICROWIRE) |
| Temperature Grade | COMMERCIAL | COMMERCIAL | EXTENDED/AUTOMOTIVE | COMMERCIAL | EXTENDED |
Bảo phân biệt quan trọng
- Integrated +2.5V reference eliminates external reference IC (vsMAX1290ACEI)
- 6-channel MUX vs 2-channel on the MAX1297 family (vsMAX1297 family)
- Parallel interface minimises host-side latency (vsMAX1291BEEI)
Ghi chú thiết kế
The MAX1295ACEI+T operates from a single +3V analog supply. Decouple AVDD with a 10uF tantalum or ceramic bulk capacitor in parallel with a 0.1uF ceramic high-frequency bypass capacitor placed as close to the AVDD pin as possible. DVDD (digital supply) must also be decoupled locally. Any noise on AVDD directly degrades sample and noise performance; consider a ferrite bead or LC filter between the system +3V rail and the ADC AVDD pin in noise-sensitive applications.
Use a star-ground topology with the AGND/DGND pins tied at a single point near the IC. Keep analog input traces short and guarded by a ground pour on both sides of the trace. Avoid routing digital signals (parallel bus, CS, RD, WR) directly across analog input traces. Place the +2.5V reference bypass capacitor (typically 0.1uF to 10uF, see datasheet) directly at the REF pin with the shortest possible PCB trace.
For pseudo-differential input mode, the common-mode input range and the absolute input voltage range are both limited to within the AVDD/AGND rails. Add external RC anti-aliasing filters on each analog input (typically 100 ohms + 1nF giving ~1.6 MHz bandwidth) to suppress out-of-band noise that could otherwise fold into the conversion bandwidth. The track-and-hold acquisition time requirement is a function of source impedance - keep the source impedance below ~1 kohm for full 12-bit accuracy at 265 ksps.
Do not leave unused analog inputs floating - tie them to AGND or a known mid-rail voltage through a defined source impedance. Floating inputs can inject charge into the MUX and cause cross-talk or excessive channel-to-channel offset. Verify the host MCU/FPGA can read the parallel bus at the required conversion rate; the MAX1295ACEI+T can produce a new conversion every ~3.8 us at 265 ksps. Always perform a calibration read after power-up if the application requires absolute accuracy better than 1 LSB.
Thông tin tuân thủ
RoHS and REACH compliant per Maxim Integrated / Analog Devices product page. AEC-Q100 not qualified at the COMMERCIAL temperature grade - choose MAX1295AEEI+T for automotive applications. Lead-free (Pb-free) package per datasheet terminal-finish specification. Halogen-free status not explicitly stated in the verified web data and is marked unknown.
