Analog Devices Inc./Maxim Integrated MAX1110CPP

Overview

MAX1110CPP from Maxim Integrated is an 8-bit, 8-channel successive-approximation analog-to-digital converter (ADC) with integrated track/hold, 2.048V internal reference, SPI/QSPI/MICROWIRE-compatible 4-wire serial interface, and software-configurable unipolar/bipolar and single-ended/differential input modes. It operates from a single 2.7V–5.5V supply, consumes only 85µA at 50ksps, and targets portable data logging and hand-held measurement systems requiring low power and multichannel sampling.

For engineers reviewing the MAX1110CPP datasheet, MAX1110CPP pinout, MAX1110CPP application, or MAX1110CPP equivalent, key selection considerations include its 8-channel single-ended input capability, 50ksps maximum sampling rate with internal clock, ±1 LSB total unadjusted error, 1µs track/hold acquisition time, and SSOP-20 package compatibility with space-constrained embedded sensor interfaces.

Technical Context

The MAX1110CPP implements a capacitive DAC-based successive-approximation architecture with an internal track/hold circuit that acquires input signals in ≤1µs and supports both internal (400kHz typical) and external (up to 2MHz) clocking for conversion control. Its analog front-end allows software-selectable channel configuration via an 8-bit control byte, enabling dynamic reconfiguration of input mode (unipolar/bipolar), polarity (single-ended/differential), and channel selection without hardware changes.

Conversion results are output in MSB-first format on DOUT synchronized to SCLK falling edges; the SSTRB signal provides end-of-conversion strobing-low-active in internal clock mode and pulse-high in external clock mode. The device supports full-scale input ranges determined by either the 2.048V internal reference or an external reference from 1V to VDD, with common-mode voltage range from AGND to VDD and ±0.5 LSB COM stability requirement.

Key Specifications

Pinout & Package

The MAX1110CPP is housed in a 20-pin shrink small-outline package (SSOP) with 0.65mm pitch, designed for surface-mount assembly and thermal performance up to +70°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit multichannel ADC applications.

Compared with MAX1110CPP, the ADS7822U offers higher throughput but demands external reference design effort and lacks bipolar input support, while the MAX1113CPE+ shares core functionality but sacrifices four analog inputs and SSOP footprint compatibility - making MAX1110CPP optimal for new 8-channel, space-constrained, low-power designs.

Availability

MAX1110CPP is available at Aetrix Electronics and suitable for portable data logging, hand-held instrumentation, and solar-powered remote monitoring systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for MAX1110CPP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, medical, and portable applications.

The MAX1110CPP belongs to Maxim's low-power serial ADC product line, engineered for battery-operated measurement systems where integration, supply flexibility, and software configurability reduce system component count and firmware complexity.

FAQ

What is the maximum sampling rate achievable with the MAX1110CPP using its internal clock?

The MAX1110CPP achieves a maximum sampling rate of 50ksps when using its internal clock source. This rate is fixed by the internal oscillator frequency and conversion timing; external clocking supports higher effective throughput only if the serial interface clock exceeds 500kHz, but the SAR conversion itself remains bounded by the internal architecture's 50ksps limit. The MAX1110CPP internal clock operates at approximately 400kHz, yielding 50ksps with 8-bit resolution and 10 clock cycles per conversion.

Does the MAX1110CPP support true differential input mode, and how is it configured?

The MAX1110CPP supports pseudo-differential input mode, not true fully differential input. In this mode, one channel serves as the positive input (IN+) and another as the negative input (IN−), selected from predefined pairs: CH0/CH1, CH2/CH3, CH4/CH5, or CH6/CH7. Configuration is done via the SGL/DIF bit (bit 2) and SEL[2:0] bits in the 8-bit control byte. The device samples the voltage difference (IN+ − IN−), but IN− must remain stable within ±0.5 LSB relative to AGND during conversion - requiring local decoupling (e.g., 0.1µF to AGND) on the IN− line.

What is the function of the SSTRB pin on the MAX1110CPP, and how does its behavior differ between clock modes?

The SSTRB (serial strobe) pin on the MAX1110CPP signals end-of-conversion. In internal clock mode, SSTRB goes low at conversion start and returns high upon completion (25µs typical pulse width). In external clock mode, SSTRB pulses high for exactly two SCLK periods immediately before the MSB appears on DOUT. This dual-mode behavior allows interrupt-driven processors to synchronize data reads without polling, and the pin is high-impedance when CS is high in external clock mode - enabling shared bus operation.

Can the MAX1110CPP operate with a 3.3V supply while interfacing with a 5V microcontroller?

Yes, the MAX1110CPP can operate with a 3.3V VDD supply while interfacing directly with a 5V microcontroller. Its digital inputs (CS, SCLK, DIN) tolerate voltages up to 5.5V regardless of VDD, eliminating the need for level shifters. DOUT and SSTRB outputs swing rail-to-rail (0V to VDD), so a 3.3V MAX1110CPP driving a 5V MCU input may require a pull-up resistor or compatible 3.3V-tolerant input; however, most modern 5V MCUs accept 3.3V logic-high thresholds, making direct connection viable in practice.

How does the power-down feature of the MAX1110CPP work, and what is the lowest achievable supply current?

The MAX1110CPP supports two power-down methods: software-controlled via PD1/PD0 bits in the control byte, and hardware-controlled via the SHDN pin. In software power-down at 1ksps, supply current drops to 6µA (typical); at 10ksps, it is 52µA. When SHDN is pulled low, supply current reduces to ≤10µA (max) with full shutdown of analog circuitry. Accessing the serial interface automatically wakes the device. The lowest confirmed supply current is 6µA in software power-down mode at 1ksps sampling rate, verified across the 0°C to +70°C operating range for the MAX1110CPP variant.