Analog Devices Inc./Maxim Integrated MAX1245BCPP+

Overview

MAX1245BCPP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. It operates from a single +2.375V to +3.3V supply, delivers 100ksps conversion rate, and achieves ±1 LSB INL at 0°C to +70°C - ideal for portable data loggers and battery-powered medical instruments.

For engineers reviewing the MAX1245BCPP+ datasheet, MAX1245BCPP+ pinout, MAX1245BCPP+ application, or MAX1245BCPP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial embedded and low-power measurement systems.

Technical Context

The MAX1245BCPP+ uses successive-approximation register (SAR) architecture with an internal track/hold circuit enabling 100kHz sampling rate and 2.25MHz small-signal bandwidth. Its analog front-end supports eight single-ended or four differential input channels via software-selectable control byte, with COM pin serving as common-mode reference in single-ended mode.

It features dual clock modes: external serial clock (100kHz–1.5MHz) for synchronous timing control, or internal clock (1.5MHz when SHDN open, 225kHz when SHDN high) for autonomous conversion. Power management includes hardware SHDN pin and software-selectable power-down, reducing supply current to 10µA at 1ksps and 1µA in shutdown mode.

Key Specifications

Pinout & Package

MAX1245BCPP+ is housed in a 20-pin plastic DIP package (0.300" wide), RoHS-compliant and socket-compatible with legacy through-hole PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit serial ADC applications.

Compared with MAX1245ACPP+, the MAX1245BCPP+ trades 0.5 LSB INL tolerance for broader availability and lower unit cost while retaining identical power management, interface compatibility, and thermal performance. Against ADS7822U, it delivers deeper power savings, built-in clock generation, and wider supply range - critical for battery-constrained or mixed-voltage designs.

Availability

MAX1245BCPP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across long production lifecycles.

Supply support for MAX1245BCPP+ 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 high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The MAX1245BCPP+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, multi-channel measurement systems where supply voltage headroom is limited and software-configurable signal conditioning is essential.

FAQ

What is the maximum sampling rate achievable with MAX1245BCPP+?

The MAX1245BCPP+ achieves a maximum sampling rate of 100ksps when using a 1.5MHz external serial clock and operating in external clock mode. This corresponds to a minimum conversion time of 15 clock cycles (10µs). In internal clock mode, the device maintains the same 100ksps capability with SHDN open (1.5MHz internal clock), but timing is decoupled from the host processor's SCLK frequency - enabling flexible readout scheduling without compromising throughput.

Does MAX1245BCPP+ require external components for basic operation?

Yes - the MAX1245BCPP+ requires at minimum a 0.1µF ceramic bypass capacitor on each VDD pin, a 0.1µF capacitor from COM to AGND (for single-ended mode stability), and a 0.1µF capacitor from VREF to AGND. No external hold capacitor is needed due to the integrated track/hold. An external reference (e.g., +2.048V) is required unless using an internally buffered reference - but the MAX1245BCPP+ does not include an internal reference, so VREF must be supplied externally.

How does the SHDN pin affect MAX1245BCPP+ clocking behavior?

The SHDN pin on the MAX1245BCPP+ provides three distinct clocking configurations: pulling SHDN low forces shutdown (10µA), letting SHDN float selects 1.5MHz internal clock, and pulling SHDN high selects 225kHz internal clock. This allows dynamic adjustment of conversion speed and power consumption without modifying the control byte - enabling adaptive sampling strategies where slower internal clocking reduces current draw during low-priority acquisitions.

Can MAX1245BCPP+ interface directly with an STM32 microcontroller's SPI peripheral?

Yes - the MAX1245BCPP+ is fully compatible with STM32 SPI peripherals when configured for CPOL = 0 and CPHA = 0 (SPI Mode 0). The device accepts 8-bit control bytes on DIN and outputs 12-bit results on DOUT, requiring two consecutive 8-bit reads (with leading zero and trailing zeros) to retrieve the full result. SSTRB provides hardware synchronization, and CS can be managed via GPIO to avoid SPI NSS limitations.

What is the guaranteed INL specification for MAX1245BCPP+ over temperature?

The MAX1245BCPP+ guarantees ±1 LSB integral nonlinearity over its full operating temperature range of 0°C to +70°C, as specified in the Ordering Information table. This is a maximum limit - typical performance is ±0.4 LSB. The parameter is production-tested and applies to all units shipped in the BCPP+ grade, ensuring monotonic behavior and predictable full-scale error without system-level calibration.