MAX1225CTC+T - 12-Bit 1.5Msps Diff ADC | Maxim Integrated
MPN: MAX1225CTC+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.85 | $68.50 |
| 100 | $5.98 | $598.00 |
| 500 | $5.21 | $2,605.00 |
| 1,000 | $4.65 | $4,650.00 |
MAX1225CTC+T Overview
Key features include successive-approximation register (SAR) architecture, throughput up to 1.5Msps, integrated track-and-hold, low power consumption (typically under 10 mW at full speed), and an SPI/QSPI/MICROWIRE-compatible serial data interface. The true-differential input stage provides inherent common-mode noise rejection, which simplifies PCB layout in noisy industrial environments and improves effective resolution when digitizing small signals riding on top of large DC offsets.
The MAX1225CTC+T uses a charge-distribution SAR core with input signal scaling and a dedicated reference input. The internal conversion clock is derived from the serial interface, removing the need for an external high-frequency oscillator. Its internal reference structure supports both internal and external reference modes, allowing designers to trade absolute accuracy for flexibility.
Typical applications include industrial process control, data-acquisition systems, motor control feedback, instrumentation, and portable or battery-powered measurement equipment. The differential input and high sampling rate also make it suitable for vibration analysis, multi-axis position sensors, and signal conditioning in noisy electrical environments. Designers select the MAX1225 when both throughput and low-power serial-interface connectivity are required.
When designing with this device, decouple both AVDD and DVDD locally with 0.1 uF and 10 uF ceramics, route analog and digital grounds as a star, and place the input RC network as close to the input pins as possible to preserve the wide analog bandwidth. Use a low-noise external reference when absolute accuracy is required; for the lowest drift, tie REF to a buffered bandgap.
This page synthesizes distributor pricing from authorized channels, drop-in same-package alternatives, and practical PCB-level design notes not found in the bare manufacturer datasheet.
Drop-in alternatives for MAX1225CTC+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 MAX1225CTC+T (same form factor and footprint) — differing in Package, Internal Reference, Operating Temperature Range, Architecture, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1225CTC+
✅ Drop-In✓ In Stock
$3.79 / Unit
View Datasheet →MAX1225ETC+
✅ Drop-In✓ In Stock
$7.6 / Unit
View Datasheet →MAX1224CTC+
✅ Drop-In✓ In Stock
$2.28 / Unit
View Datasheet →MAX1079CTC+T
✅ Drop-In✓ In Stock
$3.55 / Unit
View Datasheet →MAX1078CTC+T
✅ Drop-In✓ In Stock
$5.1 / Unit
View Datasheet →MAX1225CTC+T Maximum Ratings & Electrical Characteristics
| Architecture | Successive Approximation Register (SAR) |
| Resolution | 12 bit |
| Sampling Rate | 1.5 Msps (max) |
| Input Type | True Differential |
| Number of Channels | 1 |
| Analog Supply Voltage (AVDD) | 2.7 V to 3.6 V |
| Digital Interface Supply (DVDD) | 2.7 V to 5.25 V |
| Operating Temperature Range | 0 C to +70 C (commercial, C suffix) |
| Package Type | TQFN-12 (HVQCCN), 4x4 mm |
| Number of Terminals | 12 |
| Terminal Form | No Lead |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Input Voltage Range | 0 to VREF (unipolar); +/- VREF (bipolar with level shift) |
| Reference Mode | Internal or external reference input |
| Temperature Grade | Commercial |
| RoHS Status | Compliant |
MAX1225CTC+T Pin Configuration
| Pin 1 | AVDD — Analog supply input, 2.7 V to 3.6 V; decouple with 0.1 uF + 10 uF to AGND |
| Pin 2 | REF — Reference input/output; connect external low-noise reference or use internal |
| Pin 3 | IN+ — Positive differential analog input |
| Pin 4 | IN- — Negative differential analog input |
| Pin 5 | AGND — Analog ground |
| Pin 6 | SSTRB — Serial-strobe output; indicates conversion completion |
| Pin 7 | DOUT — Serial data output (SPI/QSPI/MICROWIRE-compatible) |
| Pin 8 | SCLK — Serial clock input |
| Pin 9 | CS — Chip-select input (active low) |
| Pin 10 | DGND — Digital ground |
| Pin 11 | DVDD — Digital interface supply, 2.7 V to 5.25 V |
| Pin 12 | NC — Not connected (per datasheet); leave floating or tie to AGND |
Typical Applications
MAX1225CTC+T is suitable for 6 applications: Industrial Data Acquisition Systems, Motor Control Current Sensing, Portable / Battery-Powered Instrumentation, Vibration and Acoustic Analysis, Medical Patient Monitoring, Test and Measurement Equipment.
Industrial Data Acquisition Systems
The MAX1225CTC+T's 1.5 Msps 12-bit SAR core and true-differential input deliver high-throughput, high-accuracy digitization for multi-channel industrial DAQ boards. Its 2.7-3.6 V analog supply keeps noise low while the 5.25 V-tolerant digital interface connects directly to 5 V host MCUs without level translation. Placed behind a multiplexer front-end and a low-noise reference, the device captures fast transient events from pressure, strain-gauge, and thermocouple sensors with 12-bit resolution. Unlike 8-/10-bit ADCs, the MAX1225 provides the headroom for 0.1 % accuracy in calibration routines.
Recommended
Motor Control Current Sensing
The MAX1225CTC+T's true-differential input is ideal for digitizing shunt-resistor current-sense signals in brushless DC and stepper motor drives. The differential architecture rejects the large common-mode switching transients from the half-bridge, allowing accurate measurement of phase current across the PWM cycle. With 1.5 Msps sampling, the device captures the full current ripple profile needed for Field-Oriented Control (FOC) loops. Placed near the low-side shunt with an RC antialiasing filter, the MAX1225 simplifies the analog front-end significantly versus single-ended ADCs.
Recommended
Portable / Battery-Powered Instrumentation
The MAX1225CTC+T's low-power design (typically under 10 mW at full speed) makes it well suited to handheld multimeters, portable vibration analyzers, and battery-powered data loggers. The 2.7 V minimum analog supply lets it run directly from a single Li-ion cell, while the auto-shutdown serial interface minimizes quiescent current between conversions. Placed behind a sensor-conditioning front-end with a low-power op-amp, the device delivers 1.5 Msps bursts for transient capture, then returns to microamp-level standby to extend battery life.
Recommended
Vibration and Acoustic Analysis
The MAX1225CTC+T's 1.5 Msps sampling rate and true-differential input support vibration and acoustic spectrum analysis on industrial machinery and structural-health monitoring nodes. With 12-bit resolution and a wide analog input bandwidth, the device captures harmonic content up to several hundred kHz when paired with an ICP/IEPE front-end. The differential input rejects ground-loop noise from long sensor cables, improving SNR in field measurements. Placed between the IEPE current source and the host DSP, the MAX1225 provides the throughput needed for real-time FFT analysis.
Recommended
Medical Patient Monitoring
The MAX1225CTC+T's 12-bit resolution and low-power serial interface support portable patient-monitoring peripherals such as pulse oximeters, ECG front-ends, and respiration monitors. The true-differential input rejects 50/60 Hz mains hum and other common-mode interference from the body, improving effective resolution when measuring low-amplitude bioelectric signals. The SPI-compatible serial interface drops directly into low-power MCUs and DSPs, keeping overall BOM small for wearable form factors. Placed after an instrumentation-amp front-end, the MAX1225 captures bioelectric waveforms with 12-bit precision.
Recommended
Test and Measurement Equipment
The MAX1225CTC+T's combination of 1.5 Msps throughput, low power, and small TQFN-12 package makes it a strong fit for bench-top oscilloscope acquisition boards, spectrum-analyzer IF digitizers, and arbitrary-waveform-generator feedback paths. The serial SPI/QSPI/MICROWIRE interface easily interfaces with FPGAs managing timing and trigger logic. Placed after the analog front-end attenuator/amplifier chain, the MAX1225 captures single-shot transients with 12-bit precision. Its true-differential input eliminates the need for input baluns in single-ended-to-differential conversion stages.
Recommended
Recommended Products Summary
Engineering reference data for MAX1225CTC+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1225CTC+ | MAX1225ETC+ | MAX1224CTC+ | MAX1079CTC+T | MAX1078CTC+T |
|---|---|---|---|---|---|---|
| Package | TQFN-12 (HVQCCN) | TQFN-12 (HVQCCN) - same | TQFN-12 (HVQCCN) - same | TQFN-12 (HVQCCN) - same | TQFN-12 (HVQCCN) - same | TQFN-12 (HVQCCN) - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 14 bit | 12 bit |
| Sampling Rate | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps | 200 ksps (14-bit) | 1.5 Msps |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Packaging | Tape and Reel (+T) | Tube (no +T suffix) | Tube (no +T suffix) | Tube (no +T suffix) | Tape and Reel (+T) | Tape and Reel (+T) |
| Pinout / Footprint | TQFN-12 (HVQCCN) | TQFN-12 (HVQCCN) - pin-to-pin identical | TQFN-12 (HVQCCN) - pin-to-pin identical | TQFN-12 (HVQCCN) - pin-to-pin identical | TQFN-12 (HVQCCN) - pin-to-pin identical | TQFN-12 (HVQCCN) - pin-to-pin identical |
| Architecture | SAR (true-differential) | SAR (true-differential) | SAR (true-differential) | SAR (true-differential) | SAR (true-differential) | SAR (true-differential) |
| Pin-Compatible Notes | TQFN-12 reference design | Drop-in (packaging variant) | Drop-in (extended temp) | Drop-in (same family variant) | Drop-in (14-bit, check reference voltage) | Drop-in (same family variant) |
Key Differentiators
- True-differential input in TQFN-12 (vs MAX1078CTC+T)
- 1.5 Msps throughput at 12-bit resolution (vs MAX1079CTC+T)
- 5.25 V-tolerant digital interface (vs Cross-brand MSOP-8 ADCs)
Design Notes
The MAX1225CTC+T requires a clean analog supply (AVDD 2.7-3.6 V) and a digital interface supply (DVDD 2.7-5.25 V). Decouple both rails locally with a 0.1 uF X7R ceramic in parallel with a 10 uF X5R ceramic placed as close to the supply pins as possible. Use a ferrite bead between AVDD and the upstream 3.3 V LDO if the digital section draws large switching currents, and route the AVDD trace directly from the LDO output to the AVDD pin to minimize IR drop and noise injection. Estimated: at 1.5 Msps the device draws approximately 3-5 mA from AVDD, so a low-noise 3.3 V LDO with at least 50 mA headroom is sufficient.
Route analog and digital grounds as a star or use a unified ground plane split under the ADC. Keep the analog input traces short and matched, with a small RC antialiasing network (typically 100 ohm and 10 pF) as close to the IN+ and IN- pins as possible. Place the reference decoupling capacitor directly at the REF pin with a short, wide trace to AGND. The exposed thermal pad of the TQFN-12 package should be soldered to a copper pour connected to AGND for thermal dissipation and noise shielding. Avoid running digital lines (SCLK, DOUT, CS) directly over the analog input region to minimize coupling.
Do not leave the REF pin floating - either tie it to an external low-noise reference or use the internal reference with the recommended bypass capacitor. Ensure CS is held low during the conversion/acquisition period or the conversion will not complete and SSTRB will not assert. Avoid applying input voltages that exceed AVDD+0.3 V or go below AGND-0.3 V; the differential input range is set by the reference voltage and must remain within the specified common-mode range. Estimated: at a 1.5 Msps sampling rate, leave at least 200 ns of settling time after CS goes low before the first SCLK edge to avoid spurious results.
Compliance Information
RoHS and REACH compliance per Maxim product page. Not AEC-Q100 qualified - choose MAX1225ETC+ for industrial temperature grade but automotive applications require separate AEC-Q100 qualified part. Lead-free (Pb-free) terminal finish per Maxim packaging specification.
