MAX1290ACEI - 400ksps 12-Bit 8-Ch SAR ADC | Maxim Integrated
MPN: MAX1290ACEI ✓ Hoạt độngMAX1290ACEI Tóm tắt
An ADC (analog-to-digital converter) is a data converter that samples continuous analog voltages and quantizes them into discrete digital codes. SAR (successive-approximation-register) ADCs use a binary search algorithm to resolve N bits in N clock cycles, trading speed for very low power consumption and zero pipeline latency - making them well-suited to multiplexed multi-channel data-acquisition systems, industrial control loops, and any application where a single conversion result must be deterministic and immediately valid. The MAX1290ACEI sits in the data-converter / signal-chain IC hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor.
Key specifications of the MAX1290ACEI include 400 ksps maximum sampling rate through its successive-approximation core, 12-bit resolution, automatic power-down between conversions for low average current, 2 us wake-up time, single +5V analog supply operation, and a separate VLOGIC pin that lets the parallel output bus interface directly with +2.7V to +5.5V digital logic. The internal +2.5V reference removes the need for an external reference IC in most designs.
Architecture is a classic charge-redistribution SAR with an input track-and-hold, switched-capacitor DAC, and comparator. Auto power-down between conversions reduces supply current at low throughput, while a hardware / software shutdown mode drops quiescent draw to microamp levels - critical for battery-powered instrumentation.
Typical applications include multichannel data-acquisition systems, industrial process control, portable instrumentation, patient monitoring, and DSP front ends. The 8 input channels allow direct connection to sensor arrays, while the parallel interface simplifies connection to microcontrollers and DSPs without an external serial-to-parallel converter.
When designing with the MAX1290ACEI, place the 0.1 uF + 10 uF decoupling capacitors as close as possible to the analog supply pins, and ensure the analog and digital grounds meet at a single star point near the ADC to avoid digital-coupling noise on the analog inputs.
This page synthesizes distributor pricing, drop-in same-family and cross-brand alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MAX1290ACEI — 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 MAX1290ACEI (cùng hình factor và footprint) — khác nhau ở RoHS Status, Sampling Rate, Number of Channels, Package, Resolution.
MAX1290BCEI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290AEEI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290ACEI+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290BEEI+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290BCEI+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX1290ACEI Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Number of Input Channels | 8 single-ended / 4 differential |
| Tỷ lệ lấy mẫu | 400 ksps |
| ADC Architecture | SAR (Successive Approximation) |
| Analog Supply Voltage | +5 V |
| Digital Logic Supply (VLOGIC) | +2.7 V to +5.5 V |
| Internal Reference Voltage | +2.5 V |
| Wake-Up Time from Shutdown | 2 us |
| Giao diện | Byte-wide parallel (8-bit) |
| Automatic Power-Down | Yes (hardware/software controlled) |
| On-Chip Clock | Yes |
| Input Type | Single-ended / pseudo-differential |
| Hộp | 28-pin QSOP |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C (commercial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân MAX1290ACEI
| 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 | AIN6 — Analog input channel 6 |
| Chân 8 | AIN7 — Analog input channel 7 |
| Chân 9 | AGND — Analog ground |
| Chân 10 | REF — Reference voltage I/O (internal +2.5V or external overdrive) |
| Chân 11 | VDD — +5V analog supply |
| Chân 12 | VLOGIC — Digital logic supply (+2.7V to +5.5V) |
| Chân 13 | DGND — Digital ground |
| Chân 14 | CS — Chip select (active low) |
| Chân 15 | RD — Read strobe (active low) |
| Chân 16 | HBEN — High-byte enable (selects MSB/LSB byte on bus) |
| Chân 17 | D0/D8 — Data bit 0 (low byte) / bit 8 (high byte) |
| Chân 18 | D1/D9 — Data bit 1 (low byte) / bit 9 (high byte) |
| Chân 19 | D2/D10 — Data bit 2 (low byte) / bit 10 (high byte) |
| Chân 20 | D3/D11 — Data bit 3 (low byte) / bit 11 (high byte, MSB) |
| Chân 21 | D4 — Data bit 4 |
| Chân 22 | D5 — Data bit 5 |
| Chân 23 | D6 — Data bit 6 |
| Chân 24 | D7 — Data bit 7 |
| Chân 25 | SHDN — Shutdown input (active low) |
| Chân 26 | INT/CLK — Conversion end / external clock input |
| Chân 27 | AVDD — Analog supply (+5V) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX1290ACEI phù hợp cho 6 Áp dụngs: Multichannel Data Acquisition Systems, Industrial Process Control, Portable Battery-Powered Instrumentation, Patient Monitoring and Medical Instrumentation, DSP and Microcontroller Front End, Rack-Mounted Test and Measurement Equipment.
Multichannel Data Acquisition Systems
The MAX1290ACEI's 8 single-ended / 4 differential input channels, 400 ksps throughput, and on-chip +2.5V reference make it a single-chip front end for multi-channel DAQ boards used in test stands and laboratory instrumentation. With 12-bit resolution and byte-wide parallel output, it streams converted samples directly into an FPGA or DSP buffer, eliminating the need for an external reference or analog mux. The automatic power-down reduces idle current between scans, and 2 us wake-up keeps scan-cycle overhead negligible at typical scan rates below 100 kHz per channel.
Được đề xuất
Industrial Process Control
In PLCs, distributed I/O modules, and process-control front ends, the MAX1290ACEI digitizes 4-20 mA-derived voltage signals from up to 8 sensors per chip. The 12-bit resolution delivers about 0.024% full-scale step size - sufficient for 0.1% accuracy industrial loops. The 0 C to +70 C commercial grade suits cabinet-mounted equipment, while the pin-compatible MAX1290AEEI+ (-40 C to +85 C) covers outdoor and factory-floor nodes. The integrated +2.5V reference eliminates a precision reference IC on the BOM, reducing cost in high-channel-count modules.
Được đề xuất
Portable Battery-Powered Instrumentation
Handheld multimeters, portable data loggers, and field instruments benefit from the MAX1290ACEI's automatic power-down mode, which drops supply current to microamp levels between conversions. At 1 ksps aggregate sampling, average supply current is dominated by shutdown current rather than active conversion current, supporting weeks of battery life from a 9V cell. The 2 us wake-up time keeps the active-window overhead low, and the parallel interface avoids the extra clock cycles a serial ADC would require, reducing MCU active time and therefore total system power.
Được đề xuất
Patient Monitoring and Medical Instrumentation
The MAX1290ACEI's 8-channel input supports multi-parameter patient monitors that simultaneously sample ECG, respiration, temperature, and SpO2-derived analog signals. The +5V analog supply simplifies the signal-conditioning chain for medical sensors, and the 12-bit resolution is adequate for non-diagnostic monitoring where high-speed high-precision is not required. Note: this is the commercial-temperature MAX1290ACEI; designs requiring medical-grade reliability or wider temperature should select the MAX1290AEEI+ variant. The integrated +2.5V reference and parallel interface reduce overall BOM and board area.
Được đề xuất
DSP and Microcontroller Front End
The MAX1290ACEI's byte-wide parallel interface connects directly to the external memory bus of TI C2000 DSPs, NXP ColdFire, and 8051-family microcontrollers without glue logic. A single MOVX-style read latches 8 conversion bits, and a second read captures the remaining 4 LSBs plus status. At 400 ksps, the ADC can continuously feed sample buffers in real-time DSP systems running motor-control, audio, or vibration-analysis algorithms. The 5V analog supply also simplifies front-end signal conditioning for industrial sensors that run off 5V rails.
Được đề xuất
Rack-Mounted Test and Measurement Equipment
Bench oscilloscopes, spectrum-analyzer IF digitizers, and automated-test-equipment (ATE) pin cards leverage the MAX1290ACEI's 400 ksps throughput and 8 input channels to digitize multiple test points in parallel. The internal +2.5V reference and on-chip clock simplify board design, while the 28-pin QSOP package fits into the dense layouts of ATE cards. Designers can stack two MAX1290ACEI chips to provide 16 synchronized channels - a common pattern when 12-bit resolution at moderate sample rates is sufficient for production-test throughput requirements.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX1290ACEI — 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 | MAX1290BCEI+ | MAX1290AEEI+ | MAX1290ACEI+T | MAX1290BEEI+ | MAX1290BCEI+T |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 28-QSOP | 28-QSOP - same | 28-QSOP - same | 28-QSOP - same | 28-QSOP - same | 28-QSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps | 400 ksps |
| Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) |
| Lead-Free / RoHS | Per commercial order code | Yes (lead-free) | Yes (lead-free) | Per commercial order code | Yes (lead-free) | Yes (lead-free) |
| Packaging Format | Tube | Tube | Tube | Tape & Reel | Tube | Tape & Reel |
Bảo phân biệt quan trọng
- Integrated +2.5V reference and on-chip clock (vsMAX1290BCEI+)
- Automatic power-down with 2 us wake-up (vsMAX1290AEEI+)
- 8/4 channel multiplexed input in 28-QSOP (vsMAX1292 (24-pin QSOP, 4 channels))
Ghi chú thiết kế
The MAX1290ACEI requires clean +5V on AVDD and a separate +2.7V to +5.5V on VLOGIC. Place a 0.1 uF X7R ceramic bypass capacitor as close as possible to each supply pin, with a 10 uF bulk tantalum or ceramic on the analog supply. Tie AVDD and VLOGIC together if the system is 5V-only - the device allows a single-rail configuration, but a small ferrite bead between the two pins reduces digital switching noise coupling into the analog section.
Use a star-ground topology: route AGND and DGND back to a single point near the ADC. Keep analog input traces short and surrounded by a ground guard ring to reduce digital-coupling noise. The 28-QSOP footprint requires thermal relief on all pads; avoid running high-current digital return paths beneath the analog input pins. For best 12-bit performance, use a continuous analog ground plane on the top layer with the ADC on the top side, and stitch the bottom-side digital ground to the top with vias near the DGND pin.
Do not leave the SHDN pin floating - tie it high (logic 1) through a 100 kohm pull-up to VLOGIC for normal operation. A floating SHDN pin can intermittently shut down the converter. The REF pin requires a 0.1 uF + 10 uF external capacitor network to keep the internal +2.5V reference stable; omitting the bulk capacitor degrades SNR by several dB. The HBEN pin must be driven by the host controller - it is not internally pulled. Read the datasheet's digital-interface timing diagram before laying out the parallel-bus connections, since a CS-to-RD setup-time violation produces corrupted data on the high byte.
Thông tin tuân thủ
RoHS compliance confirmed via distributor listings and the Analog Devices product page. Lead-free status of the bare MAX1290ACEI (no + suffix) is part-specific - for lead-free RoHS-compliant build, choose the MAX1290BCEI+ or MAX1290ACEI+T variants. AEC-Q100 is not applicable (no automotive-qualified variant in the MAX1290 family).
