BUF01900 Datasheet, PDF (7/25 Pages) Texas Instruments – Programmable Voltage Source with Memory

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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 V_COM 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
BUF01901
SBOS337A − OCTOBER 2006 − REVISED OCTOBER 2006
BUF01900: ON-CHIP BUFFER
Unlike many programmable V_COM calibrators on the mar-
ket, the BUF01900 offers an integrated V_COM 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 V_COM drive. Figure 15 shows the
BUF01900 in a typical configuration.
V_COM
V_S
V_S
0.1µF
10µF
+
(1)
(2)
(2)
BUF01900
1 V_S
SDA 8
2 V_COM
SCL 7
3 V_BIAS
A₀ 6
4 GND
V_SD 5
Timing
Controller
10kΩ 10kΩ
V_SD
0.1µF
NOTES:(1) Optional −may be needed for stability.
(2) Optional −see application text for component selection.
Figure 14. Typical Application Diagram
Digital
2V to 5.5V
Analog
7V to 18V
R₁
R₂
BUF01900
Voltage
Regulator
BIAS
4 x OTP Switch
ROM
Control
10−Bit
DAC
250kΩ
V_COM
Buffer
V_COM
Panel
Input Control Logic
SDA SCL A0
Figure 15. BUF01900 Typical Configuration
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