Analog Devices Inc./Maxim Integrated MAX1202BEAP

Overview

MAX1202BEAP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) designed for mixed 5V analog / 3V digital supply systems. It integrates an on-chip track/hold, 4.096V internal reference, SPI/MICROWIRE-compatible 4-wire interface, and supports unipolar/bipolar input modes with ±1 LSB INL accuracy. It enables high-accuracy data acquisition in battery-powered medical instruments and industrial process control.

For engineers reviewing the MAX1202BEAP datasheet, MAX1202BEAP pinout, MAX1202BEAP application, or MAX1202BEAP equivalent, key selection considerations include its 133ksps sampling rate, software-configurable power-down modes (<10μA), VL-pin-adjustable 3V/3.3V/5V digital output levels, and dual ±5V or single +5V analog supply operation.

Technical Context

The MAX1202BEAP employs successive-approximation architecture with integrated track/hold and a 4.5MHz small-signal bandwidth. Its analog front-end supports both 8-channel single-ended and 4-channel differential inputs, with channel selection and mode configuration via an 8-bit serial control word.

It features dual clocking options: internal 1.7MHz oscillator or external serial clock up to 2MHz. The reference buffer provides 4.096V ±30ppm/°C (AC grade) and is adjustable via REFADJ; digital I/O voltage level is decoupled from analog supplies via the VL pin (2.7V–5.25V).

Key Specifications

Pinout & Package

MAX1202BEAP is housed in a 20-pin SSOP package (body size 7.2mm × 5.3mm, 0.65mm pitch), RoHS-compliant and lead-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11602EEE+, the MAX1202BEAP offers superior flexibility in mixed-voltage systems due to its dual ±5V analog capability, 4.096V reference optimized for 12-bit resolution, and VL-pin programmable digital outputs-making it ideal for retrofitting legacy 5V analog circuits with modern 3V processors.

Availability

MAX1202BEAP is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial process monitoring, and 5V/3V mixed-supply data acquisition systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX1202BEAP 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 MAX1202BEAP belongs to Maxim's precision data acquisition product line, engineered for applications demanding low power, high accuracy, and robust mixed-supply interoperability in portable and embedded instrumentation.

FAQ

What is the maximum sampling rate of the MAX1202BEAP?

The MAX1202BEAP achieves a maximum sampling rate of 133ksps when using a 2MHz external serial clock and 15 clock cycles per conversion. This rate is sustained across the full commercial temperature range (0°C to +70°C) and supports real-time acquisition of signals up to ~66kHz with proper anti-alias filtering. Internal clock mode yields slightly lower throughput due to 1.7MHz oscillator frequency.

Does the MAX1202BEAP require an external reference?

No, the MAX1202BEAP includes an internal 4.096V reference buffered output, eliminating the need for an external reference in most applications. The MAX1202BEAP variant is specifically the version with internal reference; the MAX1203 series requires external reference. The internal reference is factory-trimmed and specified at ±30ppm/°C for the AC grade, and is bypassed with a 4.7μF capacitor on the REF pin for optimal stability.

How does the VL pin affect digital interface compatibility?

The VL pin on the MAX1202BEAP sets the high-level output voltage for DOUT and SSTRB, supporting 2.7V to 5.25V logic levels. This allows direct interfacing with 3.3V microcontrollers without level shifters, while maintaining compatibility with 5V CMOS inputs. When VL = 3.3V, VOH ≥ 2.8V and VOL ≤ 0.4V at 3mA sink, meeting standard 3.3V logic thresholds. The pin must be decoupled with a 0.1μF capacitor to GND.

What power-down modes does the MAX1202BEAP support?

The MAX1202BEAP supports two software-selectable power-down modes controlled via PD1/PD0 bits in the serial control byte: fast power-down (30μA typical supply current) and full power-down (2μA typical). Both modes retain register state and reference buffer bias. Power-up occurs automatically upon CS assertion and serial interface access, with turn-on time short enough to allow shutdown between individual conversions-enabling dynamic power optimization in low-duty-cycle systems.

Can the MAX1202BEAP operate with bipolar analog inputs?

Yes, the MAX1202BEAP supports bipolar input operation by configuring the UNI/BIP bit in the control byte to '0'. In this mode, the full-scale range becomes ±VREF/2 (±2.048V with internal reference), enabling measurement of AC-coupled or centered DC signals. Bipolar mode requires VSS = –5V ±5% to establish the negative rail; the analog input common-mode range remains VSS to VDD, and channel-to-channel crosstalk is –85dB at 65kHz.