BUF20800-Q1 Datasheet, PDF (21/32 Pages) Texas Instruments – 18-CHANNEL GAMMA VOLTAGE GENERATOR WITH TWO PROGRAMMABLE VCOM CHANNELS

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2.7V5V
TPS651xx
LCD
Supply
15V
26V
−14V
TPA3005D2
TPA3008D2
Audio
Speaker
Driver
3.3V
Gamma Correction
BUF20800-Q1
n
n
Source Driver
Logic and
Timing
Controller
High Resolution
TFTLCS Panel
BUF20800-Q1
SBOS571 – AUGUST 2011
V_COM
Figure 17. TI LCD Solution
THE BUF20800-Q1 IN INDUSTRIAL APPLICATIONS
The wide supply range, high output current, and very low cost make the BUF20800-Q1 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 outputs, and other functions. The BUF20800-Q1, 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-Q1 can be used in applications. A micro-controller with
two-wire serial interface controls the various DACs of the BUF20800-Q1. The BUF20800-Q1 can be used for:
• sensor excitation
• programmable bias/reference voltages
• variable power-supplies
• high-current voltage output
• 4-20mA output
• set-point generators for control loops
NOTE: The output voltages of the BUF20800-Q1 DACs will be set to (V_REFH − V_REFL)/2 at power-up or reset.
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): BUF20800-Q1
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