MAX1080BCUP+ - 400ksps 10-Bit 8-Ch Serial ADC | Maxim Integrated
MPN: MAX1080BCUP+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.06 | $70.60 |
| 100 | $6.27 | $627.00 |
| 500 | $5.65 | $2,825.00 |
| 1,000 | $5.02 | $5,020.00 |
MAX1080BCUP+ Overview
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a type of data converter that uses a binary-search algorithm against an internal DAC to digitize an analog input, one bit per clock cycle. SAR ADCs occupy the middle ground between flash converters (fastest, lowest resolution) and sigma-delta converters (slowest, highest resolution), making them the workhorse choice for 8- to 16-bit, 100 ksps to 1 Msps general-purpose data-acquisition systems.
The MAX1080 combines an 8-channel input multiplexer with a single ADC, allowing eight single-ended or four pseudo-differential analog inputs to be sampled sequentially. Key specifications include 400 ksps maximum sampling rate (300 ksps in some modes), single 4.5V to 5.5V analog supply, low 2.5 mA operating supply current, and an internal 2.5V reference. The TSSOP-20 (CUP) package saves board space while the serial interface reduces pin count versus parallel ADCs of the same generation.
Internally, the MAX1080 uses a capacitive-charge-distribution DAC with input track/hold, an on-chip clock generator, and a serial-output shift register. The architecture delivers 10-bit no-missing-code performance with excellent dynamic range for its power class, and the internal reference eliminates the need for an external precision reference component.
Typical applications include portable data loggers, system health monitoring, six-channel data acquisition front-ends, industrial process control loops, and battery-powered instrumentation. The wide analog input range (0 to VREF or 0 to 2xVREF in software-configurable modes) and low power make it especially suitable for multichannel embedded sensor reading.
When designing with this device, ensure input RC antialiasing components are matched to the channel acquisition time; the multiplexer settling time limits high-impedance source accuracy. Always provide a clean analog ground separate from digital return paths to avoid code-dependent noise.
This page synthesizes distributor pricing, drop-in equivalents, and practical design notes not found in the standalone Maxim datasheet.
Drop-in alternatives for MAX1080BCUP+ — 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 MAX1080BCUP+ (same form factor and footprint) — differing in Resolution, Package, Sampling Rate, RoHS Status, Digital Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1081ACUP
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1280BCUP
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1080BCUP+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1080BCUP+ Maximum Ratings & Electrical Characteristics
| Resolution | 10 bit |
| Number of Channels | 8 single-ended or 4 pseudo-differential |
| Sampling Rate | 400 ksps (300 ksps internal-clock mode) |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-Ended / Pseudo-Differential |
| Analog Supply Voltage | 4.5 V to 5.5 V (single supply) |
| Digital Supply Voltage | 4.5 V to 5.5 V |
| Supply Current (operating) | 2.5 mA typ |
| Internal Reference Voltage | 2.5 V |
| Digital Interface | SPI / QSPI / MICROWIRE-compatible serial |
| Package | 20-pin TSSOP (CUP) |
| Operating Temperature | 0 C to +70 C (commercial) |
| Temperature Grade | Commercial |
| Terminal Form | Gull Wing |
| RoHS Status | Compliant |
MAX1080BCUP+ Pin Configuration
| Pin 1 | CH0 — Analog input channel 0 |
| Pin 2 | CH1 — Analog input channel 1 |
| Pin 3 | CH2 — Analog input channel 2 |
| Pin 4 | CH3 — Analog input channel 3 |
| Pin 5 | CH4 — Analog input channel 4 |
| Pin 6 | CH5 — Analog input channel 5 |
| Pin 7 | CH6 — Analog input channel 6 |
| Pin 8 | CH7 — Analog input channel 7 |
| Pin 9 | AGND — Analog ground |
| Pin 10 | REF — Reference input/output (2.5 V internal) |
| Pin 11 | AVDD — Analog supply voltage |
| Pin 12 | DVDD — Digital supply voltage |
| Pin 13 | DGND — Digital ground |
| Pin 14 | SCLK — Serial clock input |
| Pin 15 | DIN — Serial data input |
| Pin 16 | DOUT — Serial data output |
| Pin 17 | SSTRB — Serial strobe output |
| Pin 18 | CS — Chip select (active low) |
| Pin 19 | RESET — Reset input |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
MAX1080BCUP+ is suitable for 6 applications: Multi-Channel Embedded Data Acquisition, Portable Battery-Powered Instrumentation, Industrial Process Control Front-Ends, System Health Monitoring, Six-to-Eight Channel Sensor Reading Modules, Educational and Prototyping Platforms.
Multi-Channel Embedded Data Acquisition
The MAX1080BCUP+ is well-suited for embedded data-acquisition systems that need to read multiple analog sensors through a single microcontroller SPI port. With 8 single-ended input channels multiplexed into one 400 ksps 10-bit SAR ADC, the device handles scan-mode reading of temperature, pressure, voltage, and current signals without an external analog switch IC. Its 2.5 mA operating current keeps thermal budget low in sealed enclosures. The internal 2.5V reference removes the BOM cost of a separate precision reference, and the SPI-compatible serial interface connects directly to common MCUs. Per Maxim datasheet, channel switching time is fast enough to settle 8 channels within the 400 ksps throughput window at typical source impedances below 5 kohm.
Recommended
Portable Battery-Powered Instrumentation
The MAX1080BCUP+ is a strong match for handheld and battery-powered instruments because it operates from a single 4.5V-5.5V supply and draws only 2.5 mA typical. The internal 2.5V reference eliminates a power-hungry external reference IC, extending battery life. SPI serial interface reduces GPIO pin count on the host MCU, leaving pins for displays and user inputs. The TSSOP-20 (CUP) package fits in compact handheld layouts. Per Maxim datasheet, the device supports a software shutdown mode that drops current to microamp levels for standby duty-cycling, which is critical for intermittent sampling on battery-powered test meters and field data loggers.
Recommended
Industrial Process Control Front-Ends
The MAX1080BCUP+ fits industrial process-control front-ends that need to digitize 4-8 sensor signals with deterministic latency. Its SAR architecture delivers a single-cycle conversion result with no pipeline delay, making it suitable for closed-loop control loops where latency matters. The 5V analog supply range matches common 24V-to-5V-isolated industrial rails. Pseudo-differential input mode rejects ground-loop noise between sensors. Per Maxim datasheet, 10-bit resolution provides 0.1% full-scale step resolution adequate for many PLC analog-input modules and HMI panel meters.
Recommended
System Health Monitoring
The MAX1080BCUP+ is well-matched for system-health-monitoring boards that read temperature, fan speed (as analog voltage), supply rail voltages, and chassis intrusion sensors. The 8-channel multiplexer reads all health parameters in a single scan cycle, while the 10-bit resolution provides adequate margin for alarm thresholds. The serial interface minimizes PCB routing in dense backplane designs. Per Maxim datasheet, the device operates reliably across the commercial 0 C to +70 C range, which covers most indoor system-monitoring applications including servers, telecom shelves, and UPS systems.
Recommended
Six-to-Eight Channel Sensor Reading Modules
The MAX1080BCUP+ is a natural fit for sensor-hub modules that aggregate multiple analog sensors into a single digital SPI stream. With 8 single-ended channels and 400 ksps throughput, it can read 8 sensors at 50 ksps each. The internal 2.5V reference simplifies ratiometric measurements with external bridge sensors. The TSSOP-20 footprint occupies roughly 6.4 mm x 4.4 mm on the PCB. Per Maxim datasheet, the device's low input capacitance makes it compatible with high-impedance source sensors, simplifying analog front-end design.
Recommended
Educational and Prototyping Platforms
The MAX1080BCUP+ is a practical choice for educational lab kits and rapid-prototyping platforms because it combines a complete 8-channel 10-bit ADC plus internal reference in one IC, allowing students and engineers to focus on application code rather than analog signal-chain design. The SPI interface works with virtually any modern MCU or FPGA development board. Per Maxim datasheet, the part is documented with detailed timing diagrams and typical application circuits that accelerate learning. The TSSOP-20 (CUP) package fits standard 0.65 mm pitch breakout boards.
Recommended
Recommended Products Summary
Engineering reference data for MAX1080BCUP+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1081ACUP | MAX1280BCUP | MAX1080BCUP+T |
|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | TSSOP-20 (CUP) | TSSOP-20 (CUP) - same | TSSOP-20 (CUP) - same | TSSOP-20 (CUP) - same |
| Resolution | 10 bit | 10 bit | 12 bit | 10 bit |
| Number of Channels | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff | 8 single-ended / 4 pseudo-diff |
| Architecture | SAR | SAR | SAR | SAR |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
| Pinout Compatibility | TSSOP-20 reference | Yes - drop-in | Yes - drop-in (firmware update required) | Yes - identical |
Key Differentiators
- Same TSSOP-20 footprint across resolution options (vs MAX1280BCUP)
- Drop-in for higher-throughput variant (vs MAX1081ACUP)
- Internal 2.5V reference integrated (vs Discrete ADC + external reference design)
Design Notes
Estimated: when digitizing high-impedance sources (>5 kohm), add an external input buffer or reduce source impedance, since the MAX1080BCUP+ input sampling capacitor charges through the source. Insufficient settling time degrades AC performance and causes channel-to-channel crosstalk in multiplexed mode. Per Maxim datasheet, the acquisition time is approximately 1.5 clock cycles; budget channel-switch time accordingly when scanning multiple channels at high throughput.
Separate analog and digital ground planes with a single-point connection under the IC AGND pin to avoid digital switching noise coupling into analog inputs. Place the 0.1 uF AVDD/DVDD decoupling capacitors within 5 mm of the supply pins, and add a 10 uF bulk capacitor on the AVDD rail. Route the SCLK trace away from analog input traces and shield it with ground to minimize digital-to-analog coupling during conversions.
Estimated: the MAX1080BCUP+ SPI interface supports SCLK up to the serial-clock limit defined by the datasheet timing table. At maximum throughput, ensure the host MCU SPI peripheral can drive 10-bit frames in Mode 0 with proper CS framing. Keep SCLK traces short (<50 mm) and add a series 33 ohm resistor near the source if reflections are observed on a long trace to the host MCU.
Compliance Information
RoHS compliance per distributor listings. AEC-Q100 not applicable for commercial-temperature-grade part.
