BUF20800 Datasheet, PDF (18/27 Pages) Burr-Brown (TI) – 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels

BUF20800
SBOS329D − JUNE 2005 − REVISED OCTOBER 2006
TOTAL TI PANEL SOLUTION
In addition to the BUF20800 programmable voltage
reference, TI offers a complete set of ICs for the LCD panel
market, including gamma correction buffers, various
power-supply solutions, and audio power solutions. See
Figure 17 for the total IC solution from TI.
THE BUF20800 IN INDUSTRIAL
APPLICATIONS
The wide supply range, high output current, and very low
cost make the BUF20800 attractive for a range of medium
accuracy industrial applications such as programmable
power supplies, multi-channel data-acquisition systems,
data-loggers, sensor excitation and linearization,
power-supply generation, and other uses. Each DAC
channel features 1LSB DNL and INL.
Many systems require different levels of biasing and power
supply for various components as well as sensor
excitation, control-loop set-points, voltage outputs, current
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outputs, and other functions. The BUF20800, with its 20
total programmable DAC channels, provides great
flexibility to the entire system by allowing the designer to
change all these parameters via software.
Figure 18 provides various ideas on how the BUF20800
can be used in applications. A micro-controller with
two-wire serial interface controls the various DACs of the
BUF20800. The BUF20800 can be used for:
D sensor excitation
D programmable bias/reference voltages
D variable power-supplies
D high-current voltage output
D 4-20mA output
D set-point generators for control loops.
NOTE: The output voltages of the BUF20800 DACs will be set
to (V_REFH − V_REFL)/2 at power-up or reset.
2.7V−5V
TPS651xx
LCD
Supply
15V
26V
−14V
TPA3005D2
TPA3008D2
Audio
Speaker
Driver
3.3V
Gamma Correction
BUF20800
n
n
Source Driver
Logic and
Timing
Controller
High−Resolution
TFT−LCS Panel
V_COM
Figure 17. TI LCD Solution
18