ADD8708:  18 - Channel Gamma Buffer with Regulator

The ADD8708 is an 18-channel integrated gamma reference for use in high resolution LCD TV and monitors panels. The out-put buffers feature high current drive and low offset voltage to provide an ...More

This product is currently being phased out of production.
Not recommended for new designs.

For assistance in finding alternate products, please use the selection table below.

ADD8708:  18 - Channel Gamma Buffer with Regulator

Product Description

The ADD8708 is an 18-channel integrated gamma reference for use in high resolution LCD TV and monitors panels. The out-put buffers feature high current drive and low offset voltage to provide an accurate and stable gamma curve. The top nine channels swing to VDD; the lower nine channels swing to GND.

Integrating the gamma setup resistors drastically reduces the external component count while increasing the gamma curve accuracy. To accommodate multiple column drivers and panel architectures, the ADD8708 is mask programmable to a 0.2% resolution using the on-chip 500 resistor string. The tap points are externally accessible for easy testing of alternative gamma curves. An on-board voltage regulator provides a fixed input for the resistor string, isolating the gamma curve from the supply ripple.

The ADD8708 is specified over the temperature range of –40°C to +105°C and comes in both a 48-lead, Pb-free, lead-frame chip-scale package and a Pb-free, low-profile, quad flat package.

Features

  • 18 Precision Gamma Reference Outputs
  • Mask-programmable Gamma Resistors:
    0.2% Resolution and 0.1% Accuracy
  • Mask-programmable Voltage Regulator:
    0.4% Accuracy
  • Upper 9 Buffers Swing to VDD
  • Lower 9 Buffers Swing to GND
  • Single-supply Operation: 7.5 V to 16.5 V
  • Gamma Current Drive: 15 mA per Channel
  • Peak Output Current: 150 mA
  • Output Voltage Stable under Load Conditions
  • Pin-to-pin Compatible with ADD8709
  • 48-lead, Pb-free LQFP and LFCSP

Diagrams

ADD8708 Diagram
Functional Block Diagram for ADD8708

Specifications

Vcc-Vee Supply (V) 7 to 16
Iq per Amplifier (max) 0.9mA
-3dB Bandwidth 4.5MHz
Aol n/a
I out Capability 150mA
Capacitive Load 200pF
Slew Rate 6V/µs
Vos 5mV
Ib 500nA
Features 18-Channel Gamma Buffers
Packages CSP,QFP

Explore Other Products

Part# V Span Max Iq per Amplifier (max) -3dB Bandwidth Aol I out Capability Capacitive Load Slew Rate Vos Ib Price* (1000-4999) Product Description
AD8560 16V 1mA 8MHz n/a 35mA n/a 8V/µs 2mV 80nA $1.02 16 V, 5-Channel, Rail - to - Rail Buffer Amplifier for LCD Monitor Applications
ADD8504 6.5V 0.95mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.80 4 - Channel LCD Gamma Reference Buffer in 16 - Lead TSSOP
ADD8505 6.5V 0.88mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.87 5 - Channel LCD Gamma Reference Buffer in 20 - Lead TSSOP
ADD8506 6.5V 0.85mA n/a n/a 20mA 1nF 7V/µs 20mV 2nA $0.96 6 - Channel Muxed Input, LCD Gamma Reference Buffer in 24 - Lead TSSOP
ADD8754 18V n/a 1.95MHz n/a 300mA n/a 105V/µs 19mV 50nA - VCOM Amplifier with LCD Panel Power & Gate Pulse Modulation Ciruitry
AD8531 6V 1.25mA 3MHz 98dB 250mA 1nF 5V/µs 25mV 5pA $0.27 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
AD8509 6.5V 944µA n/a n/a 20mA 1000pF 7V/µs 20mV 50nA $3.77 9-Channel, Multiplexed Input, LCD Driver
AD8532 6V 1.25mA 3MHz 70dB 250mA 10nF 5V/µs 25mV 5pA $0.43 Dual, 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
AD8511 6.5V 773µA n/a n/a 20mA 1000pF 7V/µs 20mV 50nA $3.99 11-Channel, Multiplexed Input, LCD Driver
AD8534 6V 1.25mA 3MHz 70dB 250mA 10nF 5V/µs 25mV 5pA $0.60 Quad, 250 mA Output Current, Rail-Rail In/Out, Single-Supply Operational Amplifier
AD8519 12V 1.2mA 8MHz 100dB 25mA 600pF 2.9V/µs 600µV 300nA $0.92 8 MHz, Rail-Rail Out, Operational Amplifier
AD8529 12V 1.2mA 8MHz 100dB 25mA 600pF 2.9V/µs 600µV 300nA $1.22 Dual, 8 MHz, Rail-Rail Out, Operational Amplifier
ADD8708 16.5V 0.9mA 4.5MHz n/a 150mA 200pF 6V/µs 5mV 500nA - 18 - Channel Gamma Buffer with Regulator