MAX1068AEEG+T - 14-Bit 200ksps Multi-Channel SAR ADC | Maxim Integrated
MPN: MAX1068AEEG+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.92 | $89.20 |
| 100 | $7.65 | $765.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.12 | $6,120.00 |
MAX1068AEEG+T Overview
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data acquisition IC that uses a binary-search algorithm against an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs occupy a middle ground between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, lowest speed) and are favored in multi-channel data-acquisition, industrial control, and process-control applications where deterministic latency and 12-16-bit resolution are required.
Key features of the MAX1068AEEG+T include a maximum sampling rate of 200 ksps, SINAD of 84 dB (81 dB minimum), SNR of 84 dB, SFDR of 99 dB (86 dB minimum), and a full-power bandwidth of 4 MHz at the -3dB point. The internal digital interface uses SPI/QSPI/MICROWIRE-compatible serial communications, simplifying connection to a wide range of microcontrollers, DSPs, and FPGAs. The 24-pin QSOP footprint provides a compact 0.154 inch body width with gull-wing leads, ideal for high-density board designs.
Architecturally, the device combines a capacitive-DAC-based SAR core, a low-noise input track-and-hold, an 8-channel analog input multiplexer, and an integrated reference buffer. The MAX1068AEEG+T accepts an external +4.096V reference voltage and offers hardware- or software-controlled channel selection. The combination of 200ksps throughput, 14-bit resolution, and integrated input mux makes it a strong fit for cost-sensitive multi-channel data-acquisition systems where PCB area is at a premium.
Typical applications include industrial process control, multi-channel data loggers, portable battery-powered instrumentation, sensor signal conditioning front ends, patient monitoring equipment, and programmable logic controller (PLC) analog input modules. The wide input range and low power also support handheld test equipment and medical instrumentation front ends.
When designing with this device, ensure the external +4.096V reference is well bypassed with a low-ESR capacitor placed close to the REF pin, and that the analog input traces are guarded against digital switching noise. The QSOP-24 package has a thermal resistance of approximately 80 C/W and operates over the industrial 0C to +70C temperature range.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical layout guidance that goes beyond the manufacturer datasheet alone.
Drop-in alternatives for MAX1068AEEG+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 MAX1068AEEG+T (same form factor and footprint) — differing in Resolution, Package, Digital Supply Voltage, Operating Temperature, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1068AEEG+
✅ Drop-In✓ In Stock
$7.48 / Unit
View Datasheet →MAX1068ACEG+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1011CEG+
✅ Drop-In✓ In Stock
$5.05 / Unit
View Datasheet →MAX1067BCEE
✅ Drop-In✓ In Stock
$9.4 / Unit
View Datasheet →MAX1068AEEG+T Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Architecture | SAR (Successive Approximation) |
| Sample Rate | 200 ksps |
| Number of Input Channels | 8 single-ended / 4 pseudo-differential |
| Input Voltage Range | 0 V to +4.096 V (with external 4.096V reference) |
| External Reference | +4.096 V |
| SINAD | 81 dB (min), 84 dB (typ) at 1 kHz |
| SNR | 84 dB |
| THD | -86 dB to -98 dB |
| SFDR | 86 dB (min), 99 dB (typ) |
| Full-Power Bandwidth | 4 MHz (-3 dB) |
| Full-Linear Bandwidth | 10 kHz (SINAD > 81 dB) |
| Analog Supply Voltage | +5 V |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Operating Temperature | 0 C to +70 C |
| Temperature Grade | Industrial (E suffix) |
| Package | QSOP-24 (0.154 inch, 0.025 inch pitch) |
| Package Code | MO-137AE |
| Pin Count | 24 |
| Lead Finish | Gull-wing, lead-free |
| RoHS Status | Compliant |
| MSL Level | 1 (per JEDEC J-STD-020) |
MAX1068AEEG+T Pin Configuration
| Pin 1 | AIN0 — Analog input channel 0 |
| Pin 2 | AIN1 — Analog input channel 1 |
| Pin 3 | AIN2 — Analog input channel 2 |
| Pin 4 | AIN3 — Analog input channel 3 |
| Pin 5 | AIN4 — Analog input channel 4 |
| Pin 6 | AIN5 — Analog input channel 5 |
| Pin 7 | AIN6 — Analog input channel 6 |
| Pin 8 | AIN7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — External +4.096V reference input |
| Pin 11 | VDD — +5V analog supply |
| Pin 12 | DGND — Digital ground |
| Pin 13 | DOUT — Serial data output |
| Pin 14 | SSTRB — Serial strobe output |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | SCLK — Serial clock input |
| Pin 18 | DIN — Serial data input |
| Pin 19 | CS — Active-low chip select |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | SHDN — Active-low shutdown control |
| Pin 23 | AVDD — Analog +5V supply |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
MAX1068AEEG+T is suitable for 6 applications: Industrial Process Control, Multi-Channel Data Logger, Patient Monitoring Front End, Sensor Signal Conditioning Hub, PLC Analog Input Module, Portable Battery-Powered Instrumentation.
Industrial Process Control
The MAX1068AEEG+T's 8 single-ended or 4 pseudo-differential input channels, 14-bit resolution, and 200 ksps throughput make it ideal for multi-loop industrial process control. The MAX1068AEEG+T can scan up to 8 4-20mA loop signals or thermocouple outputs in rapid succession, with 84 dB SINAD providing 0.5 C resolution on type-K thermocouples when properly amplified. The integrated input multiplexer eliminates external analog switches, saving roughly $2 BOM cost per PLC analog module. The +5V supply and QSOP-24 footprint simplify PCB integration alongside industrial microcontrollers like the MAX32625 or STM32F4.
Recommended
Multi-Channel Data Logger
With 200 ksps aggregate throughput across 8 channels, the MAX1068AEEG+T can sample and digitize 25 ksps per channel continuously for portable data-logging applications. The MAX1068AEEG+T's low power consumption and 5V single-supply operation extend battery life in field-deployed loggers measuring temperature, vibration, or strain. The SPI-compatible serial interface reduces microcontroller pin count to just 4 (CS, SCLK, DIN, DOUT), simplifying firmware and reducing PCB area by roughly 60 percent compared to parallel-output ADCs of similar performance.
Recommended
Patient Monitoring Front End
The MAX1068AEEG+T's 14-bit resolution, 4 MHz full-power bandwidth, and 99 dB SFDR deliver clean digitization of ECG, SpO2, and body-impedance signals in patient monitoring equipment. The MAX1068AEEG+T samples each bioelectric channel at rates up to 200 ksps with sufficient resolution for 0.5 mV ECG amplitude steps and acceptable motion-artifact rejection. The pseudo-differential input configuration rejects common-mode 50/60 Hz interference from long patient cables. The compact QSOP-24 footprint saves critical PCB space in compact wearable monitors where board area directly impacts enclosure size.
Recommended
Sensor Signal Conditioning Hub
The MAX1068AEEG+T's integrated 8-channel multiplexer makes it ideal for digitizing multiple sensor outputs in distributed measurement systems. The MAX1068AEEG+T can simultaneously sample bridge pressure sensors, RTDs, and accelerometer outputs from a single IC, replacing dedicated signal chains that would otherwise require one ADC per sensor. The 4 MHz full-power bandwidth handles vibration and acoustic sensor outputs without aliasing. The QSOP-24 3.9mm body width allows eight such hubs to be placed on a single 100x100 mm sensor-interface PCB.
Recommended
PLC Analog Input Module
The MAX1068AEEG+T's industrial temperature grade (0C to +70C) and +5V single-supply operation suit it directly for analog input modules in programmable logic controllers. The MAX1068AEEG+T can digitize 8 differential or 16 single-ended channels (with external switching) at 200 ksps, supporting the cycle times required for high-speed PID control loops. The SPI interface connects directly to backplane microcontrollers over isolated SPI links using digital isolators such as the MAX12930. Industrial compliance to IEC 61131-2 noise standards is achievable with proper PCB layout guarding and reference decoupling.
Recommended
Portable Battery-Powered Instrumentation
The MAX1068AEEG+T's single +5V supply and modest power consumption make it well suited for handheld battery-powered test instruments such as multimeters, oscilloscopes, and LCR meters. The MAX1068AEEG+T provides 14-bit resolution adequate for 0.1 percent measurement accuracy, while the 200 ksps sampling rate captures transient waveforms at the bandwidth required for 100 kHz signal analysis. The QSOP-24 package consumes only 3.9 mm of board width, leaving space for display drivers, keypad scanning, and battery management on the same PCB.
Recommended
Recommended Products Summary
Engineering reference data for MAX1068AEEG+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1068AEEG+ | MAX1068ACEG+ | MAX1011CEG+ |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | QSOP-24 (MO-137AE) | QSOP-24 - same | QSOP-24 - same | QSOP-24 - same |
| Resolution | 14 bits | 14 bits | 14 bits | 14 bits |
| Sample Rate | 200 ksps | 200 ksps | 200 ksps | 100 ksps |
| Input Channels | 8 SE / 4 PD | 8 SE / 4 PD | 8 SE / 4 PD | 8 SE / 4 PD |
| External Reference | +4.096 V | +4.096 V | +4.096 V | +4.096 V |
| Packaging | Tape & Reel (+T suffix) | Tube (+ suffix) | Tube (+ suffix) | Tube (+ suffix) |
Key Differentiators
- Higher sample rate than the MAX1011CEG+ alternative (vs MAX1011CEG+)
- Tighter SINAD than the MAX1068ACEG+ C-grade variant (vs MAX1068ACEG+)
- 8-channel integrated multiplexer replaces external switching (vs MAX1240BCSA+T)
Design Notes
Decouple the +5V AVDD pin with a 10 uF tantalum capacitor in parallel with a 0.1 uF ceramic capacitor placed within 3 mm of the IC. Use a ferrite bead between analog and digital +5V rails to isolate switching noise from digital logic. The MAX1068AEEG+T draws approximately 5 mA from AVDD during active conversion and drops to 1 uA in shutdown mode via the SHDN pin, making it suitable for battery-powered designs.
Route analog input traces (AIN0-AIN7) as guarded differential pairs with the AGND pin serving as a low-impedance return path. Keep digital traces (SCLK, DIN, DOUT, CS) at least 5 mm away from analog traces or shield them with ground pours. The Maxim datasheet recommends a star-ground topology connecting the analog and digital ground returns only at a single point under the IC to prevent digital switching currents from corrupting the analog input measurements.
Use a low-noise +4.096V reference such as the MAX6126AASA25 with 3 uVrms noise and 3 ppm/C drift, bypassed with a 4.7 uF ceramic + 0.1 uF ceramic combination at the REF pin. Reference noise directly limits ADC SNR - the MAX1068AEEG+T achieves 84 dB SNR only with a reference noise below 5 uVrms in the 0.1 Hz to 10 kHz band. For highest DC accuracy, allow a 10 ms warm-up after power-up before taking critical measurements.
Do not leave the SHDN pin floating - tie it to AVDD through a 100 kohm resistor if hardware shutdown is not used, otherwise the device may enter shutdown mode unpredictably. Apply external protection (TVS diodes or clamping zeners) to the AIN pins if the input source can exceed 0 V to +4.096 V, as the multiplexer is not rated beyond absolute maximum ratings. Always issue a software conversion-start command after CS falling edge within the timing specified in the datasheet to avoid incorrect channel data.
Compliance Information
RoHS compliant per Maxim Integrated product page. Industrial temperature grade (E suffix) operates 0C to +70C - not AEC-Q100 qualified for automotive. The +T suffix denotes tape-and-reel packaging per Maxim/Analog Devices ordering nomenclature.
