Analog Devices Inc./Maxim Integrated MAX1202BCAP+T

Overview

MAX1202BCAP+T 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 MAX1202BCAP+T datasheet, MAX1202BCAP+T pinout, MAX1202BCAP+T application, or MAX1202BCAP+T equivalent, key selection criteria include its 133ksps sampling rate, user-adjustable VL-supplied 2.7–5.25V digital output levels, dual ±5V or single +5V analog supply operation, and software-configurable power-down modes achieving <10μA supply current.

Technical Context

The MAX1202BCAP+T employs successive-approximation architecture with integrated track/hold and internal 4.096V reference buffer. Its analog front-end supports both 8-channel single-ended and 4-channel pseudo-differential inputs, with channel selection and mode configuration controlled via an 8-bit serial command word.

Conversion timing is synchronized to either internal clock (1.7MHz typ.) or external serial clock up to 2MHz; SSTRB strobe output provides precise conversion status signaling. The device uses a capacitive DAC architecture with 16pF hold capacitor and supports acquisition times as low as 1.5μs with source impedances ≤1kΩ.

Key Specifications

Pinout & Package

MAX1202BCAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead 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 MAX11131ETE+, the MAX1202BCAP+T uniquely combines internal 4.096V reference, VL-adjustable digital outputs, three-level shutdown, and bipolar/single-ended software configuration-making it optimal for portable, mixed-supply, and calibration-sensitive applications where design simplicity and supply flexibility are prioritized over raw speed.

Availability

MAX1202BCAP+T is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial process control, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX1202BCAP+T 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 MAX1202BCAP+T belongs to Maxim's precision data-acquisition ADC family, engineered for systems requiring seamless integration between 5V analog signal chains and 3V digital controllers while minimizing external components and power consumption.

FAQ

What is the maximum sampling rate of the MAX1202BCAP+T?

The MAX1202BCAP+T 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 accurate digitization of signals up to ~66kHz using undersampling techniques, provided anti-alias filtering is applied.

Does the MAX1202BCAP+T require an external reference voltage?

No, the MAX1202BCAP+T includes an internal 4.096V reference with ±30ppm/°C temperature coefficient and ±1.5% adjustability via REFADJ. Unlike the MAX1203 variant, the MAX1202BCAP+T does not require an external reference, simplifying design and reducing BOM cost-though an external reference can be used if higher precision or different voltage is needed.

How does the VL pin affect digital interface compatibility for the MAX1202BCAP+T?

The VL pin on the MAX1202BCAP+T sets the high-level output voltage for DOUT and SSTRB, supporting 2.7V to 5.25V logic levels. This allows direct interfacing with 3V, 3.3V, or 5V microcontrollers without level-shifting circuitry. When VL = 3.3V, DOUT outputs VOH ≥ 2.8V and VOL ≤ 0.4V at 3mA sink, meeting standard 3.3V CMOS thresholds.

What power-down modes does the MAX1202BCAP+T support, and how are they selected?

The MAX1202BCAP+T supports two software-selectable power-down modes via bits PD1/PD0 in the 8-bit control byte: fast power-down (30μA typical) and full power-down (2μA typical). Both modes retain register state and wake automatically on CS assertion. Additionally, a hard-wired SHDN pin provides hardware-initiated shutdown (<10μA), independent of serial commands.

Can the MAX1202BCAP+T perform differential measurements, and how is channel pairing configured?

Yes, the MAX1202BCAP+T supports pseudo-differential measurements across four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Configuration is done via the SGL/DIF bit (bit 2) and SEL2–SEL0 bits (bits 6–4) in the serial control byte. In differential mode, the device samples the voltage difference |IN+ − IN−|, with IN− held stable (±0.1 LSB) using a local 0.1μF bypass capacitor to GND.