Analog Devices Inc./Maxim Integrated DS3514T+

Overview

DS3514T+ from Maxim Integrated is a programmable I²C gamma and VCOM buffer IC with on-chip EEPROM, designed for TFT-LCD panel biasing. It integrates 14 × 10-bit gamma DACs (GM1–GM14), one 8-bit VCOM DAC, rail-to-rail buffer amplifiers, and four independent EEPROM banks per channel. It operates from 9.0V to 15.0V analog supply and 2.7V to 5.5V digital supply, delivering 250mA peak VCOM drive current and sub-5μs gamma settling time - enabling real-time display calibration in industrial and automotive LCD systems.

For engineers reviewing the DS3514T+ datasheet, DS3514T+ pinout, DS3514T+ application, or DS3514T+ equivalent, key selection considerations include its dual-mode control (S0/S1 pin-selectable EEPROM banks vs. I²C individual-channel update), 48-pin TQFN package with exposed pad, 400kHz I²C interface compliance, and factory-default S0/S1 bank-updating mode supporting temperature-compensated gamma tables and backlight dimming algorithms.

Technical Context

The DS3514T+ implements three configurable operating modes via Control Register bits CR.1 and CR.0: S0/S1 pin-controlled bank selection (factory default), SOFT S0/S1 bit-controlled bank selection (I²C-written), and I²C individual-channel Latch A update mode. Each gamma channel has four 10-bit EEPROM words; the VCOM channel has four 8-bit EEPROM words - enabling storage of multiple gamma/VCOM profiles for adaptive display tuning.

Its architecture features dual independently loaded data latches (Latch A and Latch B) per channel, asynchronous DAC updates via LD pin edge transitions, and high-current VCOM output optimized for fast settling (<2.0μs to 0.1%) into 1μF capacitive loads. The device supports power-on recall from EEPROM based on S0/S1 state or fixed address, and includes thermal shutdown at +150°C junction temperature.

Key Specifications

Pinout & Package

DS3514T+ is housed in a 48-pin TQFN-EP package (7mm × 7mm) with exposed thermal pad (EP) connected to GND. Pin count, layout, and thermal design support high-density LCD controller board integration while maintaining low thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar gamma and VCOM buffer applications.

Compared with MAX11300 and DS90UB954-Q1, the DS3514T+ uniquely combines dedicated high-current VCOM drive, 14-channel gamma buffering, on-chip EEPROM profile storage, and dual-mode (pin + I²C) control - making it the only single-chip solution for TFT-LCD panel-level adaptive biasing without external support components.

Availability

DS3514T+ is available at Aetrix Electronics and suitable for industrial HMI displays, automotive instrument clusters, medical imaging monitors, and public kiosk LCD systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for DS3514T+ 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DS3514T+ belongs to Maxim's display interface and panel bias product line, engineered specifically to replace manual trim-pot calibration in TFT-LCD modules with programmable, EEPROM-backed gamma and VCOM control - reducing manufacturing cost and improving display consistency.

FAQ

What is the operating temperature range for the DS3514T+?

The DS3514T+ is rated for operation from −45°C to +95°C, with programming specified from 0°C to +85°C. This extended industrial temperature range supports deployment in automotive dashboards, outdoor kiosks, and industrial HMIs where ambient conditions exceed commercial-grade limits. The device also includes thermal shutdown protection that disables the VCOM buffer if junction temperature exceeds +150°C.

How does the DS3514T+ handle EEPROM profile selection during power-up?

The DS3514T+ selects DAC data from EEPROM at power-up based on the state of the S0 and S1 pins - unless configured via Control Register to use a fixed memory address. In factory-default mode (MODE0=0, MODE1=0), S0/S1 determine which of four stored gamma/VCOM banks (A–D) is loaded. This allows hardware-defined startup behavior without MCU initialization, critical for fail-safe display boot sequences.

Can the DS3514T+ drive standard TFT-LCD VCOM nodes without external components?

Yes - the DS3514T+ integrates a high-current VCOM buffer capable of delivering 250mA peak into a 1μF load, meeting requirements for most mid-to-large-size TFT-LCD panels. It requires only a single 1μF capacitor from VCOM pin to GND for stability. No external op-amp, transistor, or charge pump is needed, simplifying layout and reducing BOM count versus discrete solutions.

What are the I²C addressing options for the DS3514T+?

The DS3514T+ uses a 7-bit I²C slave address determined by the A0 pin: A0 = GND yields address 0xC0 (1100000b), and A0 = VCC yields 0xC2 (1100010b). This allows two DS3514T+ devices to share the same I²C bus - for example, one managing gamma and another handling VCOM in split-architecture designs - without address conflict or level-shifting.

Does the DS3514T+ support simultaneous update of all gamma and VCOM channels?

Yes - the LD (Latch Data) pin enables synchronous, glitch-free updating of all 14 gamma outputs and the VCOM output with a single rising-edge transition. When LD goes high, data from Latch B (loaded from EEPROM or I²C Latch A) propagates to all DACs simultaneously. This ensures temporal alignment of bias voltages across the panel, preventing vertical banding or grayscale inversion during profile switches.