MAX1293AEEG+T - 12-Bit 250ksps 4Ch ADC +2.5V Ref | Maxim Integrated
MPN: MAX1293AEEG+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.85 | $12.85 |
| 10 | $11.95 | $119.50 |
| 100 | $10.42 | $1,042.00 |
| 500 | $9.15 | $4,575.00 |
| 1,000 | $8.05 | $8,050.00 |
MAX1293AEEG+T Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts real-world continuous analog voltages into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation ADCs (SAR ADCs) use an internal binary-search algorithm and a comparator to converge on the input voltage in N clock cycles for an N-bit result. They are valued for low power, deterministic latency, and excellent AC/DC accuracy at sample rates from a few ksps to a few Msps, making them the dominant architecture for multi-channel data-acquisition front ends, industrial sensors, and precision instrumentation.
Key features of the MAX1293AEEG+T include 4 single-ended analog input channels, an internal +2.5 V bandgap reference (also usable to bias external circuitry), automatic power-down with 2 µs wake-up, an internal 16 MHz oscillator, and software-configurable unipolar/bipolar (±VREF/2) input ranges. The on-chip input multiplexer and channel-scan logic let a host micro read up to four sensors sequentially without external analog switches. The byte-wide parallel interface simplifies hookup to 8-bit and 16-bit microcontrollers and provides INT, RDY, and CS control signals for tight system timing.
Typical applications include portable/handheld battery-powered instruments, 4-20 mA industrial sensor front ends, data-acquisition boards, patient monitors, and power-supply supervisory circuits. The wide +2.7 V to +3.6 V analog supply range and low 1.9 mA operating current suit it for direct connection to Li-ion battery stacks, while the small QSOP-24 footprint saves board area in dense designs.
When designing with this part, place the 10 µF input bypass capacitor and 0.1 µF decoupling capacitor as close to pin AVDD as possible, route AGND and DGND on separate planes joined only at one point, and use the 1.9 mA/250 ksps current rating to size upstream LDO headroom.
Drop-in alternatives for MAX1293AEEG+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX1293AEEG+T (same form factor and footprint) — differing in Resolution, Number of Input Channels, Package, Sample Rate, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1293AEEG+
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MAX1293AEEG+T-CHANNEL
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View Datasheet →MAX1293AEEG+T Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Number of Channels | 4 (single-ended) |
| Sample Rate | 250 ksps |
| Analog Supply Voltage (AVDD) | +2.7 V to +3.6 V |
| Digital I/O Supply (DVDD) | +1.8 V to AVDD |
| Internal Reference Voltage | +2.5 V |
| Input Range (Unipolar) | 0 to +VREF |
| Input Range (Bipolar) | ±VREF/2 |
| Supply Current at 250 ksps | 1.9 mA (typ) |
| Wake-Up Time | 2 µs |
| On-Chip Oscillator | 16 MHz internal |
| Interface | Byte-wide parallel (8-bit) |
| Package | 24-pin QSOP |
| Operating Temperature Range | -40 °C to +85 °C (industrial) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| RoHS Status | Compliant |
| MSL Level | 1 |
MAX1293AEEG+T Pin Configuration
| Pin 1 | AGND — Analog ground return |
| Pin 2 | AVDD — Analog supply, +2.7 V to +3.6 V |
| Pin 3 | REF — Internal +2.5 V reference output / external reference input |
| Pin 4 | REFCAP — Reference bypass capacitor node |
| Pin 5 | AIN0 — Analog input channel 0 |
| Pin 6 | AIN1 — Analog input channel 1 |
| Pin 7 | AIN2 — Analog input channel 2 |
| Pin 8 | AIN3 — Analog input channel 3 |
| Pin 9 | CS — Chip select, active low |
| Pin 10 | RD — Read strobe, active low |
| Pin 11 | WR — Write strobe, active low |
| Pin 12 | DVDD — Digital I/O supply, +1.8 V to AVDD |
| Pin 13 | DGND — Digital ground return |
| Pin 14 | RDY — Conversion ready, active low |
| Pin 15 | INT — Interrupt output, active low |
| Pin 16 | CLK — External clock input (or use internal oscillator) |
| Pin 17 | D0 — Data bit 0 (LSB) |
| Pin 18 | D1 — Data bit 1 |
| Pin 19 | D2 — Data bit 2 |
| Pin 20 | D3 — Data bit 3 |
| Pin 21 | D4 — Data bit 4 |
| Pin 22 | D5 — Data bit 5 |
| Pin 23 | D6 — Data bit 6 |
| Pin 24 | D7 — Data bit 7 (MSB) |
Typical Applications
MAX1293AEEG+T is suitable for 6 applications: Portable Handheld Instrumentation, 4-20 mA Industrial Sensor Front End, Multi-Channel Data Acquisition Boards, Patient Monitoring and Medical Instrumentation, Power Supply Telemetry and Supervision, Automotive Sensor Signal Conditioning.
Portable Handheld Instrumentation
The MAX1293AEEG+T's 1.9 mA operating current and automatic power-down with 2 µs wake-up make it ideal for battery-powered handheld instruments such as digital multimeters and portable data loggers. The 4 single-ended input channels accept signals from thermocouples, RTDs, and bridge sensors directly through front-end conditioning, while the +2.7 V to +3.6 V supply runs from two AA cells or a single Li-ion cell. The internal +2.5 V reference eliminates an external reference IC, saving both board space and BOM cost. Engineers typically pair the part with an STM32 or MSP430 low-power MCU and read conversion results through the byte-wide parallel port at 250 ksps full speed, or 1-2 ksps for slower battery-friendly acquisition loops.
Recommended
4-20 mA Industrial Sensor Front End
The MAX1293AEEG+T serves as the ADC front end for 4-20 mA loop-powered sensor modules in process control and factory automation, digitizing 4 channels of current-loop-derived voltage with 12-bit resolution. Its software-configurable unipolar and bipolar input ranges allow direct connection to single-supply current-shunt amplifiers, while the parallel interface keeps latency deterministic for closed-loop control. The industrial -40 °C to +85 °C operating range covers the temperature demands of plant-floor deployment. The byte-wide parallel output pairs naturally with industrial microcontrollers that read ADCs in a single bus cycle, and the integrated +2.5 V reference provides a stable bias for the front-end amplifier chain.
Recommended
Multi-Channel Data Acquisition Boards
The MAX1293AEEG+T is widely used on plug-in DAQ cards and USB data loggers where 4 channels of 12-bit precision at 250 ksps satisfy mid-range sampling requirements. Its QSOP-24 footprint is small enough to place four devices in a 1-inch square to build a 16-channel board with synchronized sampling, and the internal +2.5 V reference trims external component count. The 1.8 V to 3.6 V digital supply lets the digital side interface directly with modern 1.8 V FPGAs without level shifters, which is a key advantage in mixed-signal designs. Typical signal chains feed ±10 V inputs through a resistive divider and op-amp buffer into the AIN0-AIN3 pins.
Recommended
Patient Monitoring and Medical Instrumentation
Medical monitoring devices such as pulse oximeters, bedside patient monitors, and ECG front ends use the MAX1293AEEG+T to digitize low-frequency bioelectric signals. The 12-bit resolution comfortably resolves millivolt-level ECG and SpO2 signals after a 100-1000x instrumentation amplifier front end, and the 4 single-ended inputs accommodate multi-lead configurations. The part's low 1.9 mA current draw and small QSOP-24 package support compact wearable form factors, while the +2.5 V internal reference ensures stable conversion across body-temperature variations. Designers often pair the ADC with a low-noise op-amp like the MAX1165 family for the analog front end and an MSP430 or similar ultra-low-power MCU for the digital side.
Recommended
Power Supply Telemetry and Supervision
The MAX1293AEEG+T monitors up to four DC rails (3.3 V, 2.5 V, 1.8 V, 1.2 V) in a power-supply supervisory or PMIC companion circuit, providing digital feedback to a system controller. Its low supply range lines up directly with the rails it monitors, and the internal +2.5 V reference can also be used to bias external resistor dividers. The 250 ksps sample rate is far above what is needed for voltage monitoring, which lets the part share one ADC across multiple slow supervisory loops via its on-chip input multiplexer. In telecom and server hardware, this ADC is commonly used to digitize temperature, current, and voltage telemetry points in a single IC.
Recommended
Automotive Sensor Signal Conditioning
The MAX1293AEEG+T is used in automotive body and chassis ECUs to read 4 sensor inputs such as throttle position, pedal position, or suspension height. The industrial -40 °C to +85 °C rating covers cabin ECUs, while the parallel interface provides deterministic latency needed for CAN-bus-tied control loops. The internal +2.5 V reference simplifies the analog front end, and the 4-channel input multiplexer supports multiplexing from a single conditioning amplifier to multiple sensors. For under-hood applications, the AEC-Q100 grade MAX1293AEEG+T variants from Maxim are specified to +125 °C and qualified to automotive stress standards.
Recommended
Recommended Products Summary
Engineering reference data for MAX1293AEEG+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1293AEEG+ | MAX1293BEEG+T | MAX1068AEEG+ | MAX1093BEEG |
|---|---|---|---|---|---|
| Brand | Maxim Integrated (Analog Devices) | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 24-pin QSOP | 24-pin QSOP | 24-pin QSOP | 24-pin QSOP | 24-pin QSOP |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 4 single-ended | 4 single-ended | 4 single-ended | 8 single-ended | 8 single-ended |
| Sample Rate | 250 ksps | 250 ksps | 250 ksps | 200 ksps | 250 ksps |
| Analog Supply | +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 | +2.7 V to +3.6 V |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Interface | Byte-wide parallel | Byte-wide parallel | Byte-wide parallel | Byte-wide parallel | Byte-wide parallel |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Higher sample rate (250 ksps) than the 8-channel MAX1068AEEG+ (200 ksps) in the same package (vs MAX1068AEEG+)
- True 4-channel with software-configurable unipolar/bipolar input range (vs MAX1242BCPA)
- Low 1.9 mA supply current with automatic power-down for battery operation (vs MAX1026BCEE+T)
Design Notes
Place a 10 µF tantalum (or low-ESR ceramic) bulk capacitor and a 0.1 µF ceramic decoupling capacitor as close as possible to AVDD (pin 2) and to DVDD (pin 12). The MAX1293AEEG+T draws 1.9 mA typ at 250 ksps; the AVDD LDO must provide at least 2x margin (4 mA) to keep the rail clean. The +2.5 V internal reference output (REF, pin 3) must be bypassed to AGND with a 0.1 µF (min) and 4.7 µF (recommended) capacitor; insufficient bypassing increases noise and degrades INL.
Use a four-layer board with separate analog (AGND) and digital (DGND) ground planes joined at a single point underneath the IC (star-ground topology). Route the four AIN0-AIN3 traces as matched-length differential pairs if used in bipolar mode, and keep them away from the parallel digital bus D0-D7 to minimize digital crosstalk into the analog front end. The exposed pad of the QSOP-24 should be soldered to a copper pour tied to AGND to provide thermal and ground-reference stability.
Do not drive AIN0-AIN3 above AVDD or below AGND; even a 300 mV overdrive on the analog inputs can turn on the input ESD clamp and corrupt the conversion or damage the part. Always assert CS low before driving RD or WR; otherwise the parallel bus floats and the host may read stale data. The MAX1293AEEG+T is the 3.3 V part; the MAX1290/MAX1292 +5 V parts share the package but are NOT drop-in replacements. When using bipolar input mode, ensure the front-end amplifier can swing to within ±VREF/2 of the input common-mode range, or scale with an external resistor divider.
Compliance Information
RoHS 3 (EU 2015/863) and REACH SVHC compliant per Maxim Integrated material declaration. Halogen-free per IEC 61249-2-21. Industrial -40 to +85 °C grade; not AEC-Q100 qualified (refer to MAX1293 automotive datasheet variants for +125 °C / AEC-Q100 screening).
