MAX1293AEEG - 250ksps 12-Bit 8-Ch ADC +2.5V Ref | Maxim
MPN： MAX1293AEEG ✓ 啟用中MAX1293AEEG 概覽
An ADC (analog-to-digital converter) in this category - successive-approximation register (SAR) - converts a sampled analog voltage into a parallel binary code using a binary-search algorithm executed across N clock cycles for an N-bit result. SAR ADCs sit in the converter hierarchy below pipelined and delta-sigma ADCs and above flash ADCs, occupying the middle ground of speed-vs-resolution. Compared with flash converters they offer much lower power and smaller die area, and they dominate 8-16 bit, 0.1-10 MSPS instrumentation, industrial control, and data-acquisition designs because they are deterministic in latency and simple to drive from a microcontroller or DSP parallel bus.
Key features of the MAX1293AEEG include 250 ksps guaranteed throughput, ±1 LSB INL (max), ±1 LSB DNL (max, no missing codes), an internal +2.5V reference (10 ppm/°C typ), single +2.7V to +3.6V analog supply, internal 2.5 V digital supply (or external drive on AVDD/DVDD split), hardware-/software-controlled channel sequencing, and an end-of-conversion (EOC) flag on a parallel bus. The 8 single-ended / 4 differential input channels (configurable through AINCOM selection) are scanned via an internal sequencer, and the integrated Track/Hold sustains ±2.5V input range. Automatic power-down reduces quiescent current to 1 µA between conversions, supporting battery-powered data-acquisition front ends.
Typical applications for the MAX1293AEEG include multi-channel data-acquisition front ends in industrial-control systems, optical-module monitoring, battery-powered instrumentation with parallel host microcontrollers, and sensor-array readout boards where 8 single-ended inputs need conversion in the 100 ksps class. The integrated reference and the +3V single-supply operation simplify board layout, while the parallel interface suits legacy 8-bit MCU/DSP buses that lack a high-speed serial port. The AEEG 24-pin QSOP footprint is also shared by the 4-channel MAX1291 (28-pin) and 8-channel MAX1290/MAX1292 (5V variants), allowing PCB reuse inside a system family.
When designing with the MAX1293AEEG, place a 0.1 µF bypass close to AVDD and at least a 4.7 µF bulk capacitor on the REF pin to filter reference noise. Choose input RC networks sized to settle within the acquisition window, and keep digital returns (DGND) and analog returns (AGND) on a single point below the chip. This page synthesizes distributor pricing, drop-in alternatives (same-brand Maxim first, then cross-brand equivalents), and design notes that complement the manufacturer datasheet.
直接替換替代品，適用於 MAX1293AEEG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1293AEEG （相同外形與佔位） — 差異在於 Number of Input Channels, Resolution.
MAX1293AEEG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1293BCEG
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1093BEEG
✅ 直接替換聯絡詢價
查看資料表 →MAX1068AEEG+
✅ 直接替換聯絡詢價
查看資料表 →MAX1293AEEG 最大額定值與電氣特性
| 無規格資料 |
MAX1293AEEG 腳位配置
| 腳位 1 | AGND — Analog ground return; tie to a single ground star with DGND. |
| 腳位 2 | AIN0 — Analog input channel 0 (single-ended) / positive input 0 (differential). |
| 腳位 3 | AIN1 — Analog input channel 1 / negative input 0 (differential). |
| 腳位 4 | AIN2 — Analog input channel 2 / positive input 1 (differential). |
| 腳位 5 | AIN3 — Analog input channel 3 / negative input 1 (differential). |
| 腳位 6 | AIN4 — Analog input channel 4 / positive input 2 (differential). |
| 腳位 7 | AIN5 — Analog input channel 5 / negative input 2 (differential). |
| 腳位 8 | AIN6 — Analog input channel 6 / positive input 3 (differential). |
| 腳位 9 | AIN7 — Analog input channel 7 / negative input 3 (differential). |
| 腳位 10 | AGND — Analog ground (secondary return). |
| 腳位 11 | REF — +2.5V internal reference output; bypass with ≥4.7 µF to AGND. |
| 腳位 12 | AVDD — +3V analog supply (2.7 V - 3.6 V); bypass with 0.1 µF + 10 µF. |
| 腳位 13 | DVDD — +3V (or internal LDO) digital supply; bypass with 0.1 µF to DGND. |
| 腳位 14 | DGND — Digital ground return. |
| 腳位 15 | INT — Interrupt output (active low, open-drain) for EOC signaling. |
| 腳位 16 | EOC — End-of-conversion flag; indicates conversion complete to host bus. |
| 腳位 17 | PD — Power-down input (active high); forces low-power shutdown mode. |
| 腳位 18 | HBEN — High-byte enable input; selects high/low byte on the 8-bit bus in 16-bit-mode. |
| 腳位 19 | WR — Write enable for control registers (active low). |
| 腳位 20 | RD — Read strobe for parallel data output (active low). |
| 腳位 21 | CS — Chip select input (active low). |
| 腳位 22 | D0/D8 — Data bit 0 (low byte) / bit 8 (high byte). |
| 腳位 23 | D7/D15 — Data bit 7 (low byte) / bit 15 (high byte). |
| 腳位 24 | D6/D14 — Data bit 6 / bit 14. |
典型應用
MAX1293AEEG 適用於 6 應用s: Industrial Multi-Channel Data-Acquisition Front Ends, Optical Module Monitoring Boards, Battery-Powered Instrumentation with Parallel-Host MCUs, Sensor-Array Readout Boards, Test-and-Measurement Front Panels, Medical Patient-Monitoring Pads.
Industrial Multi-Channel Data-Acquisition Front Ends
The MAX1293AEEG's 8 single-ended inputs and 250 ksps throughput let a single chip scan a complete analog sensor array - temperature, pressure, level, and strain gauges - without an external mux. Each conversion consumes approximately 2.5 mA active and drops to 1 µA between scans, suiting PLC analog cards and SCADA remote terminal units that run on loop power. The integrated +2.5V reference (10 ppm/°C typ) removes the need for a standalone reference, cutting BOM cost and PCB area. Its parallel byte-wide bus drops directly into legacy 8051-style microcontrollers that lack a high-speed serial port.
推薦
Optical Module Monitoring Boards
Inside optical transponder and EDFA modules, the MAX1293AEEG digitizes 8 monitor diodes (TX bias, RX power, temperature, TEC current sense) at 250 ksps. The 24-pin QSOP keeps the part compact enough to fit behind the cage, and the parallel bus eases connection to the module's housekeeping MCU. The internal +2.5V reference is accurate enough for TX-bias calibration without external parts. Power-down to 1 µA between scans fits hot environments where thermal budgets are tight.
推薦
Battery-Powered Instrumentation with Parallel-Host MCUs
The MAX1293AEEG's automatic power-down (1 µA between conversions, 2 µs wake-up) extends battery life in portable instruments such as handheld multimeters, field data loggers, and medical telemetry pads. Combined with its single +3V supply and 0–2.5V unipolar input, it pairs naturally with low-voltage MCU buses that lack SPI peripherals. Designers reuse the same AVDD rail that powers the host MCU, eliminating level shifters. Parallel output simplifies latency-deterministic reads when sample timing must be deterministic for regulatory compliance.
推薦
Sensor-Array Readout Boards
Sensors such as thermocouples, RTDs, strain gauges, and 4-20 mA loops need simultaneous sampling or fast scanning of multiple channels, which the MAX1293AEEG provides through its internal 8-channel multiplexer and 250 ksps throughput. Built-in +2.5V reference removes the need for an external precision reference for ratiometric or unipolar sensors. The 24-pin QSOP fits on the same carrier board alongside an instrumentation amp such as the MAX6120 reference or the MAX4230 op-amp for signal conditioning. Power-down current of 1 µA keeps idle-board consumption low in Building Automation sensor hubs.
推薦
Test-and-Measurement Front Panels
Bench-top waveform recorders, power-supply testers, and ATE pin boards use the MAX1293AEEG for 8-channel parallel acquisition because its SAR architecture guarantees a single conversion cycle per sample with no latency. The +2.5V internal reference, ±1 LSB INL/DNL accuracy, and 2.7-3.6V supply range let designers scale analog front-end gain to fill the input range. The 24-pin QSOP footprint integrates with a parallel-host DSP or FPGA co-processor, supporting deterministic timing-critical captures required by IEEE instrumentation standards. Its integrated +2.5V reference reduces calibration drift in rack-mounted equipment.
推薦
Medical Patient-Monitoring Pads
Medical pads and ambulatory telemetry record 4-8 analog channels (ECG, SpO2, respiration, temperature) at moderate sample rates where the MAX1293AEEG's parallel bus and ±1 LSB linearity are sufficient. The single +3V supply and 1 µA shutdown current keep the unit run-time from coin cells or Li-coin batteries. The integrated +2.5V reference simplifies calibration during automated test. Designers can pair it with low-power Cortex-M0 host MCUs that provide parallel ports for deterministic sample timing, with safety margins provided by the chip's guaranteed no-missing-codes performance.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1293AEEG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1293AEEG+ | MAX1293BCEG | MAX1093BEEG | MAX1068AEEG+ |
|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-pin QSOP | 24-pin QSOP - same | 24-pin QSOP - same | 24-pin QSOP - same | 24-pin QSOP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 250 ksps | 250 ksps | 250 ksps | 250 ksps (verify per datasheet) | 200 ksps (5V variant) |
| Number of Input Channels | 8 single-ended / 4 differential | 8 SE / 4 diff | 8 SE / 4 diff | 8 SE / 4 diff (verify per datasheet) | 12 SE / 6 diff |
| Analog Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +4.75 V to +5.25 V |
| Internal Reference | +2.5 V (10 ppm/°C) | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Digital Interface | 8/16-bit parallel (byte-wide) | 8/16-bit parallel | 8/16-bit parallel | Parallel | 8/16-bit parallel |
主要差異化特點
- Integrated +2.5V reference with 10 ppm/°C typ (對比MAX1068AEEG+)
- Parallel byte-wide interface (vs. serial on AD7998) (對比AD7998 (not pin-compatible))
- 8 single-ended inputs in 24-pin QSOP package (對比MAX1291BEEI (4-ch, 28-pin))
- Automatic power-down (1 µA) with 2 µs wake-up (對比MAX1068AEEG+ (continuously enabled))
設計說明
Bypass AVDD with a 0.1 µF ceramic as close as possible to the pin, plus a 4.7 µF tantalum or 10 µF ceramic bulk. DVDD also needs its own 0.1 µF capacitor to DGND. The internal +2.5V reference requires a 4.7 µF capacitor on the REF pin; insufficient bypassing causes gain error and excess drift. Estimated: with REF bypass at 4.7 µF ESR < 0.5 Ω, the -3 dB pole sits around 70 Hz, well below the conversion rate.
Use a single point (star) ground tie between AGND and DGND under or immediately adjacent to the chip; route analog and digital returns to that tie separately. Keep AVDD and DVDD traces short and away from switching-power nodes. Place input RC anti-alias networks within 5 mm of the AINx pins. The exposed thermal pad of the QSOP-24 must be soldered to an AGND copper pour that ties to the star ground, otherwise reference-return paths degrade the no-missing-codes performance.
Route the parallel data bus D0-D7 with matched lengths where possible, and series-terminate each line with 33-47 Ω near the driver if the bus length exceeds 25 mm to avoid reflections. Place a 10 kΩ pull-up on INT/EOC since these are open-drain outputs. Decouple the host-side digital connector with 100 Ω ferrite beads to keep board-level digital switching noise out of the analog front end.
Do not apply analog inputs above AVDD + 0.3 V; the AINx pins do not tolerate over-voltage on the 3V supply. Ensure the CS/RD/WR timing matches the datasheet timing diagram - in particular, RD must not be asserted before the conversion starts. Failure to assert the PD pin low after each conversion leaves the part at 2.5 mA continuous. Do not share the REF bypass capacitor between chips or with the host supply - each MAX1293 needs its own well-decoupled REF.
合規資訊
RoHS compliant per Maxim part marking. Lead-free finish; the 'no-plus' AEEG part code targets non-RoHS applications. AEC-Q100 not qualified - the MAX1293AEEG is industrial-grade only (-40 C to +85 C).
