Analog Devices Inc./Maxim Integrated MAX1512ETA+T

Overview

MAX1512ETA+T from Maxim Integrated is an EEPROM-programmable TFT LCD VCOM calibrator IC that replaces mechanical potentiometers in thin-film transistor display backplane voltage adjustment. It features a 7-bit ratiometric DAC, single-wire CTL interface for programming and adjustment, 4.5V–20V analog supply (AVDD), 2.6V–3.6V logic supply (VDD), and stores calibrated VCOM settings in nonvolatile memory for power-on default restoration.

For engineers reviewing the MAX1512ETA+T datasheet, MAX1512ETA+T pinout, MAX1512ETA+T application, or MAX1512ETA+T equivalent, this device is selected for automated VCOM calibration in production-grade TFT LCD panels where precision, repeatability, and elimination of manual trim are critical.

Technical Context

The MAX1512ETA+T implements a programmable current-sink architecture where the internal 7-bit DAC controls I_OUT to adjust VCOM via an external resistive divider. Its sink current is ratiometric to AVDD and guaranteed monotonic across -40°C to +85°C, ensuring predictable stepwise VCOM reduction without code skips.

Programming and real-time adjustment share the single CTL pin using pulse-based logic: low pulses increment DAC (lower VCOM), high pulses decrement (raise VCOM), and a precise 15.5V ramp waveform programs the EEPROM. CE enables/disables the CTL interface to reduce VDD current from 32µA to 12µA when inactive.

Key Specifications

Pinout & Package

The MAX1512ETA+T is housed in an 8-pin 3mm × 3mm thin dual flat no-lead (TDFN) package with exposed thermal pad. Pin 1 is marked with a "+" on lead-free variants. The package supports reflow soldering per JEDEC J-STD-020 and provides low thermal resistance for stable operation in LCD panel environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar VCOM calibration applications.

Compared with MAX1513ETA+T, the MAX1512ETA+T eliminates buffer overhead and saves board space where external VCOM buffering exists; versus TPS65150RGER, it provides autonomous, nonvolatile calibration without MCU coordination-critical for high-throughput panel test fixtures.

Availability

MAX1512ETA+T is available at Aetrix Electronics and suitable for notebook computers, industrial HMIs, LCD TVs, and monitor manufacturing requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.

Supply support for MAX1512ETA+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and consumer applications.

The MAX1512ETA+T belongs to Maxim's TFT display power and timing IC product line, engineered specifically to replace electromechanical VCOM trims with programmable, repeatable, and production-ready calibration solutions.

FAQ

What is the primary function of the MAX1512ETA+T in an LCD panel?

The MAX1512ETA+T serves as an EEPROM-programmable VCOM calibrator IC that replaces mechanical potentiometers in TFT LCD backplane voltage adjustment. It sinks a programmable current from an external resistive divider to precisely set the VCOM voltage level, stores the calibrated value in nonvolatile memory, and restores it at power-up-ensuring consistent grayscale performance across production units and operating conditions.

How does the single-wire CTL interface on the MAX1512ETA+T operate?

The CTL pin on the MAX1512ETA+T performs dual functions: short pulses (<200µs) adjust the DAC setting (low pulse increments, high pulse decrements), while a controlled 15.5V ramp waveform programs the EEPROM. This eliminates separate data and power lines, reducing connector complexity and enabling integration into existing panel interfaces with minimal hardware changes.

What is the role of the RSET resistor connected to the SET pin of the MAX1512ETA+T?

The RSET resistor connected between the SET pin and GND sets the full-scale sink current (I_OUT) of the MAX1512ETA+T, which determines the minimum achievable VCOM voltage and the resolution of adjustment. With RSET values from 2.25kΩ to 45kΩ, designers can tailor the VCOM range to match specific panel requirements while maintaining monotonic DAC behavior.

Can the MAX1512ETA+T operate with different AVDD supply voltages, and what is the supported range?

Yes, the MAX1512ETA+T supports an AVDD supply range of 4.5V to 20V, making it compatible with diverse TFT LCD panel architectures-from low-voltage portable displays to high-voltage large-format monitors and TVs. Its ratiometric DAC ensures sink-current accuracy scales proportionally with AVDD, preserving calibration integrity across varying rail voltages.

How does the CE pin affect power consumption and functionality of the MAX1512ETA+T?

The CE (Chip Enable) pin on the MAX1512ETA+T disables the CTL interface when pulled low, reducing VDD supply current from 32µA to 12µA. This feature allows system-level power gating during idle periods or post-calibration, improving overall energy efficiency in battery-powered or thermally constrained LCD modules without compromising VCOM retention.