MAX1070CTC+T - 1.5Msps 10-Bit SAR ADC | Analog Devices/Maxim
MPN: MAX1070CTC+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.42 | $7.42 |
| 10 | $6.65 | $66.50 |
| 100 | $5.95 | $595.00 |
| 500 | $5.34 | $2,670.00 |
| 1,000 | $4.78 | $4,780.00 |
MAX1070CTC+T Overview
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a sampled-data ADC class that uses a binary-search algorithm against an internal DAC to resolve each conversion in N clock cycles (N = resolution in bits). SAR ADCs sit in the broader hierarchy ADC -> data converter -> mixed-signal IC -> semiconductor, and are favored over delta-sigma and pipeline ADCs for multiplexed-channel, low-latency, medium-resolution (8-16 bit) applications because they require no digital filtering and offer deterministic latency.
Key differentiating features of the MAX1070CTC+T include the true-differential input architecture (rejecting common-mode noise in industrial environments), an integrated 2.5V internal reference (eliminating an external reference IC and saving board area), a hardware/software shutdown pin that reduces supply current to ~1µA between bursts, and a 10MHz SPI-compatible serial interface that minimizes pin count and simplifies optocoupling to isolated controllers. The 12-pin WQFN (HVQCCN, 4x4 mm) footprint is thermally efficient and suitable for hand-solderable QFN replacement in low-volume designs. The T suffix denotes tape-and-reel packaging for high-volume SMT assembly.
Typical applications include industrial process-control loops (4-20mA sensor digitization), portable instrumentation and battery-powered data loggers, multichannel data-acquisition (DAQ) systems, optical-module monitoring, and ultrasound or vibration front-ends where the differential input improves rejection of ground-bounce and motor noise.
When designing with this part, place 0.1µF bypass capacitors as close as possible to AVDD and DVDD, and add a 10µF bulk tantalum on AVDD. The internal reference noise is typically 2.4mV p-p; for systems requiring lower noise, override REF with an external 2.5V reference such as the MAX6143. The shutdown pin (SHDN) can be driven from a logic output or tied high for always-on operation.
This page aggregates distributor pricing, pin-compatible drop-in alternates, and practical layout notes not bundled in the manufacturer datasheet alone.
Drop-in alternatives for MAX1070CTC+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 MAX1070CTC+T (same form factor and footprint) — differing in Package, Number of Channels, Analog Supply Voltage, Digital Supply Voltage, Internal Reference.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1070CTC+
✅ Drop-In✓ In Stock
$5.18 / Unit
View Datasheet →MAX1070ETC+T
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →MAX1070CTC-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1077ETC+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1070CTC+T Maximum Ratings & Electrical Characteristics
| Resolution | 10 bits |
| Sampling Rate (max) | 1.5 Msps |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 (true-differential) |
| Input Type | True-differential |
| Analog Supply Voltage | 2.7 V to 3.6 V |
| Digital Supply Voltage | 2.7 V to 3.6 V (same as AVDD) |
| Supply Current (operating, typ) | 3.2 mA |
| Supply Current (shutdown, max) | 1 uA |
| Internal Reference | 2.5 V (on-chip) |
| Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Operating Temperature Range | 0C to +70C (commercial) |
| Package | 12-pin WQFN (HVQCCN) 4x4 mm |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant (lead-free finish) |
MAX1070CTC+T Pin Configuration
| Pin 1 | AVDD — Analog supply, 2.7V-3.6V; bypass with 0.1uF + 10uF |
| Pin 2 | DVDD — Digital supply, tie to AVDD; bypass with 0.1uF |
| Pin 3 | REF — Internal 2.5V reference; bypass with 4.7uF to AGND |
| Pin 4 | AGND — Analog ground (also tied to exposed pad) |
| Pin 5 | IN+ — Positive differential analog input |
| Pin 6 | IN- — Negative differential analog input |
| Pin 7 | SHDN — Active-low shutdown; tie HIGH for always-on, LOW for <1uA Iq |
| Pin 8 | CS — Active-low chip-select for SPI; tie LOW for continuous conversion |
| Pin 9 | SCLK — Serial clock input; up to 20 MHz |
| Pin 10 | DOUT — Serial data output, MSB-first |
| Pin 11 | DGND — Digital ground, tie to AGND |
| Pin 12 | NC — Not connected (per datasheet) |
Typical Applications
MAX1070CTC+T is suitable for 7 applications: Industrial Process Control & 4-20mA Sensor Digitization, Portable Battery-Powered Data Loggers, Multi-Channel Data Acquisition (DAQ) Systems, Optical Module Monitoring & Transceiver Bias Control, Medical Vital-Sign Monitoring Front-Ends, Industrial Vibration & Condition Monitoring, Ultrasound Beamforming Front-End.
Industrial Process Control & 4-20mA Sensor Digitization
The MAX1070CTC+T is a strong fit for industrial 4-20mA current-loop receivers and process-control front-ends because its true-differential input rejects common-mode noise from long cable runs in motor-control cabinets. With 1.5Msps throughput it oversamples the typical 4-20mA loop bandwidth, allowing digital filtering of 50/60Hz mains interference. The 2.7-3.6V single supply is directly compatible with 3.3V PLC backplanes, and the SPI bus is opto-isolated with a single digital isolator, preserving ground isolation. Power dissipation at 3.2mA keeps heat rise below 1C even in sealed IP65 transducer housings. Reference design patterns from the Maxim datasheet typical application circuit use a 4.7uF REF bypass and a 10ohm input RC for EMI suppression, providing a turnkey layout.
Recommended
Portable Battery-Powered Data Loggers
Battery-powered data loggers for field instrumentation benefit from the MAX1070CTC+T's 3.2mA active current and 1uA shutdown current, giving an energy budget of roughly 250nJ per conversion when sampling at 1Msps from a 3.0V coin cell. The 12-pin WQFN's 4x4 mm footprint fits in compact handheld enclosures, and the integrated 2.5V reference eliminates a second IC, reducing BOM cost and quiescent draw. Engineers use the shutdown pin to wake the ADC on a sensor-triggered interrupt, returning it to sub-microamp quiescent between bursts - a critical technique for multi-year battery life. The true-differential input pairs naturally with bridge-type load cells, RTDs, and strain gauges used in portable weighing scales.
Recommended
Multi-Channel Data Acquisition (DAQ) Systems
In multi-channel DAQ front-ends for bench instruments and test equipment, the MAX1070CTC+T serves as the per-channel digitizer behind a low-leakage mux such as the MAX306. The 1.5Msps rate lets a 16-channel system scan at 100kHz per channel with 5x oversampling for averaging gain. The serial SPI/QSPI-compatible interface allows the ADC to be daisy-chained or star-wired to a single FPGA or MCU, and the 12-WQFN small footprint lets designers pack 8 ADC instances on a 25x40 mm analog front-end card. The internal reference eliminates one external component per channel, a critical cost-down lever for high-density DAQ designs.
Recommended
Optical Module Monitoring & Transceiver Bias Control
SFP/QSFP optical transceivers and pluggable modules need a small, low-power ADC to monitor laser bias current, temperature, and received power - exactly the use case for the MAX1070CTC+T in a 12-WQFN. The true-differential input digitizes the small voltage across a 1-ohm sense resistor with 10-bit resolution and 1.5Msps, fast enough for closed-loop laser-bias control. The single 3.3V supply matches the optical module's main rail, and the SPI bus is routable to the module's I2C management interface via a small bridge controller. Shutdown current of 1uA preserves the module standby budget when the host goes to low-power state.
Recommended
Medical Vital-Sign Monitoring Front-Ends
Patient-monitoring front-ends for ECG, SpO2, and temperature require a low-power differential ADC with good common-mode rejection - characteristics the MAX1070CTC+T delivers in a 12-WQFN footprint. The 1.5Msps rate is more than sufficient for the 500Hz bandwidth of clinical ECG signals, providing 12x oversampling for digital low-pass filtering and 50/60Hz notch. The 3.2mA operation current keeps the ADC within the 5mA budget of a battery-powered wearable patch, and the 1uA shutdown pin enables duty-cycled SpO2 sampling. The integrated reference removes a calibration component, simplifying IEC 60601-1-2 EMI compliance testing.
Recommended
Industrial Vibration & Condition Monitoring
Predictive-maintenance sensors mounted on motors, pumps, and bearings digitize wideband vibration using MEMS accelerometers feeding into a true-differential SAR ADC - the MAX1070CTC+T is well-matched here because its 1.5Msps rate covers 4x the 20kHz vibration bandwidth with margin for anti-aliasing. The differential input rejects ground-bounce from variable-frequency drives that share the chassis with the sensor. The single-supply 3.3V operation powers the ADC from the same LDO as the MEMS element, and the SPI bus streams raw samples to an ARM Cortex-M0+. The 12-WQFN package fits inside M8-sized sensor enclosures. Power dissipation is low enough to avoid heating the MEMS proof mass, preserving calibration.
Recommended
Ultrasound Beamforming Front-End
Low-end portable ultrasound probes use the MAX1070CTC+T in the per-channel receive path, where its true-differential input cancels the common-mode switching noise from the TX pulser and its 1.5Msps rate oversamples the 5-10MHz demodulated IF signal after the LNA. The 12-WQFN keeps each channel small enough to fit 32 channels on a 25x80 mm probe PCB, and the integrated reference cuts bill-of-materials compared to an external 2.5V. SPI daisy-chaining lowers FPGA pin count, and the 1uA shutdown lets the probe enter standby between examinations to extend battery run-time.
Recommended
Recommended Products Summary
Engineering reference data for MAX1070CTC+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1070CTC+ | MAX1070ETC+T | MAX1070CTC-T | MAX1077ETC+T |
|---|---|---|---|---|---|
| Package | 12-WQFN (HVQCCN) 4x4 mm | 12-WQFN - same | 12-WQFN - same | 12-WQFN - same | 12-WQFN - same |
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Resolution | 10 bits | 10 bits | 10 bits | 10 bits | 10 bits |
| Max Sample Rate | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps | 1.5 Msps (or higher) |
| Input Type | True-differential | True-differential | True-differential | True-differential | True-differential |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Supply Current (typ operating) | 3.2 mA | 3.2 mA | 3.2 mA | 3.2 mA | 3.2 mA |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| Operating Temperature | 0C to +70C (commercial) | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C |
Key Differentiators
- True-differential input vs pseudo-differential competitors (vs MAX1069AEUD+ (14-TSSOP, pseudo-differential))
- Integrated 2.5V reference vs external reference parts (vs MAX1068 (no internal reference))
- 1.5Msps throughput vs 200-ksps family (vs MAX1036/MAX1037 (200 ksps variants))
Design Notes
Bypass AVDD with a 0.1uF X7R ceramic within 2 mm of pin 1, plus a 10uF tantalum or polymer aluminum bulk capacitor on the same node. DVDD may be tied to AVDD but should still have its own 0.1uF bypass within 2 mm of pin 2 to prevent digital switching noise from corrupting the analog reference. Estimated: total quiescent draw 3.2mA + 1uA in shutdown, so a 3.3V/100mA LDO such as the MAX8881 is more than sufficient.
Route the analog input traces (IN+, IN-) as a matched-length differential pair on a continuous ground reference plane; do not split the ground under the ADC. The exposed pad on the WQFN-12 must be soldered to a 5x5 mm copper pad with at least 8 thermal vias to the inner ground plane - this doubles as the AGND connection and provides 35C/W thermal dissipation. Keep digital SPI traces (SCLK, DOUT, CS) perpendicular to the analog inputs to minimize digital coupling into the sample-and-hold.
Do not leave REF floating; the datasheet requires a 4.7uF X5R or better bypass on REF for the internal reference noise to settle within 1 LSB. Do not drive SHDN below 0V or above VDD+0.3V; the absolute-maximum rating is -0.3V to VDD+0.3V per the datasheet. Do not exceed the 20 MHz SCLK maximum - the ADC will return all-ones and require a power cycle. Estimated: at 1.5Msps continuous operation, the MAX1070 consumes roughly 10 mW average, so thermal management in a sealed enclosure is rarely required, but sustained 10 MHz SPI bursts near the absolute-maximum may need margin in high-temperature industrial environments.
Compliance Information
RoHS and REACH compliant per Maxim Integrated product page; MSL 1 rating. Not AEC-Q100 qualified; choose MAX1070 automotive variant if available for automotive applications. Lead-free reflow-compatible up to 260C peak.
