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BUF01901AIDRCRG4 Fiches technique(PDF) 7 Page - Texas Instruments

No de pièce BUF01901AIDRCRG4
Description  Programmable Voltage Source with Memory
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

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BUF01900
BUF01901
SBOS337A − OCTOBER 2006 − REVISED OCTOBER 2006
www.ti.com
7
APPLICATIONS INFORMATION
OVERVIEW
The BUF0190x family of products consists of a 10-bit digi-
tal-to-analog converter (DAC) that is programmed through
an industry-standard two-wire interface. It contains on-
chip nonvolatile memory that stores a specific DAC value
that is read at power-up. The BUF0190x family consists of
two devices: The BUF01900 contains a voltage buffer that
is capable of driving high-current; the BUF01901 is a low-
er-cost version without the buffer. The BUF0190x is espe-
cially well-suited for VCOM calibration in LCD panels; how-
ever, it can also be used in many other applications.
Figure 14 shows the BUF01900 in a typical configuration.
BUF01900: ON-CHIP BUFFER
Unlike many programmable VCOM calibrators on the mar-
ket, the BUF01900 offers an integrated VCOM buffer with
high current output drive capability. The output is capable
of delivering peak currents over 100mA to within 4V from
the positive supply and to within 2V from the negative sup-
ply. Using this option is very cost-effective and convenient
in systems that do not use multi-channel gamma buffers
with
integrated
VCOM drive. Figure 15 shows the
BUF01900 in a typical configuration.
(1)
Timing
Controller
0.1
µF
0.1
µF
V
S
V
SD
V
COM
(2)
(2)
V
S
10
µF
10k
10k
+
1
2
3
4
8
7
6
5
SDA
SCL
A
0
V
SD
V
S
V
COM
V
BIAS
GND
(1) Optional −may be needed for stability.
(2) Optional −see application text for component selection.
BUF01900
NOTES:
Figure 14. Typical Application Diagram
BIAS
250k
Analog
7V to 18V
R
1
R
2
Digital
2V to 5.5V
SDA
Input Control Logic
SCL
A0
10−Bit
DAC
4x OTP
ROM
Switch
Control
Voltage
Regulator
BUF01900
V
COM
Buffer
V
COM
Panel
Figure 15. BUF01900 Typical Configuration


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