Analog Devices Inc./Maxim Integrated MAX1202ACAP

Overview

MAX1202ACAP 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 ±0.5 LSB INL accuracy at +25°C. It delivers 133ksps sampling rate and operates from single +5V or dual ±5V analog supplies - ideal for portable data acquisition in battery-powered medical instruments.

For engineers reviewing the MAX1202ACAP datasheet, MAX1202ACAP pinout, MAX1202ACAP application, or MAX1202ACAP equivalent, key selection criteria include its 20-pin SSOP package, software-configurable power-down modes (<10 µA), user-adjustable VL-supplied 3V/3.3V/5V digital output levels, and compatibility with TMS320-family DSPs via SSTRB strobe.

Technical Context

The MAX1202ACAP uses successive-approximation architecture with integrated track/hold circuitry, enabling precise sampling of analog inputs up to 4.5 MHz small-signal bandwidth. Its internal 4.096V reference (±30 ppm/°C tempco) feeds a buffered reference output, while REFADJ allows ±1.5% gain trim - critical for high-accuracy process control calibration.

It implements a flexible 8-bit control byte for channel selection (CH0–CH7), input mode (single-ended/differential), polarity (unipolar/bipolar), and clock/power-down configuration. Serial interface timing is fully compatible with SPI (CPOL=0, CPHA=0) and MICROWIRE, with DOUT and SSTRB synchronized to SCLK falling edges.

Key Specifications

Pinout & Package

MAX1202ACAP is housed in a 20-pin shrink small-outline package (SSOP), RoHS-compliant and rated for 0°C to +70°C operation. The package footprint matches industry-standard 0.65 mm pitch SSOP layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11126ETE+, the MAX1202ACAP uniquely combines internal 4.096V reference, software-configurable differential inputs, and TMS320-compatible SSTRB - making it optimal for mixed-voltage, low-power, multi-sensor embedded systems where calibration simplicity and interface flexibility are critical.

Availability

MAX1202ACAP is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered data loggers, and industrial process control systems requiring stable component supply and long-term lifecycle support.

Supply support for MAX1202ACAP 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 MAX1202 family was engineered for low-power, mixed-supply data acquisition - targeting portable instrumentation and embedded systems where precision, small size, and supply flexibility are essential design constraints.

FAQ

What is the maximum sampling rate of the MAX1202ACAP?

The MAX1202ACAP achieves a maximum sampling rate of 133 ksps using a 2 MHz external serial clock and 15 clock cycles per conversion. This rate is sustained across the full 0°C to +70°C operating range and is enabled by its integrated track/hold and optimized successive-approximation architecture. The MAX1202ACAP maintains this performance without external timing components.

Does the MAX1202ACAP require an external reference voltage?

No, the MAX1202ACAP includes an internal 4.096V reference with ±30 ppm/°C temperature coefficient and ±0.5 LSB INL - eliminating the need for external reference components. The REFADJ pin allows ±1.5% gain adjustment to compensate for system-level errors, and the reference buffer simplifies driving capacitive loads. This capability is specific to the MAX1202 series; the MAX1203 variant requires external reference.

How does the VL pin affect digital interface operation in the MAX1202ACAP?

The VL pin on the MAX1202ACAP sets the high-level output voltage for DOUT and SSTRB, supporting 2.7V to 5.25V logic levels. This allows direct connection to 3V microcontrollers, 3.3V FPGAs, or 5V logic without level shifters. When VL = 3.3V, VOH ≥ 2.8V and VOL ≤ 0.4V at 3 mA sink - ensuring robust noise margins in mixed-voltage systems using the MAX1202ACAP.

Can the MAX1202ACAP operate with a single +5V supply?

Yes, the MAX1202ACAP operates with a single +5V analog supply (VDD) and ground (GND/VSS = 0V), supporting unipolar input ranges up to 4.096V. It also supports dual ±5V supplies for bipolar operation (±2.048V). The device's analog section is fully functional in either configuration, and the digital interface remains independent via the VL pin - a key feature enabling flexible power architecture in the MAX1202ACAP.

What power-down modes does the MAX1202ACAP support, and how are they selected?

The MAX1202ACAP supports two software-selectable power-down modes via bits PD1/PD0 in the 8-bit control byte: fast power-down (30 µA) and full power-down (2 µA). Both modes retain register state and allow instant wake-up via serial interface access. The SHDN pin provides hardware-controlled shutdown to ~10 µA. These low-current states are validated across the 0°C to +70°C range and are integral to the MAX1202ACAP's energy-efficient design.