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| 型号： | BUF20820EVM |
| 厂商： | Texas Instruments |
| 文件页数： | 10/29页 |
| 文件大小： | 0K |
| 描述： | EVAL MOUDLE FOR BUF20820 |
| 标准包装： | 1 |
| 系列： | * |
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BUF20820
SBOS330E DECEMBER 2005 REVISED OCTOBER 2008
www.ti.com
18
CONFIGURATION FOR 22 GAMMA CHANNELS
In addition to the VCOM outputs, the REFH and REFL OUT
outputs can also be used as fixed gamma references. The
output voltage will be set by the REFH and REFL input
voltages, respectively. Therefore, REFH OUT should be
used for the highest voltage gamma reference, and REFL
OUT for the lowest voltage gamma reference. A
22-channel solution can be created by using all 18 outputs,
the two VCOM outputs, and both REFH/L OUT outputs for
gamma references—see Figure 17. However, the REFH
and REFL OUT buffers were designed to only drive light
loads on the order of 510mA. Driving capacitive loads is
not recommended with these buffers. In addition, the
REFH and REFL buffers must not be allowed to saturate
from sourcing/sinking too much current from REFH OUT
or REFL OUT. Saturation of the REFH and REFL buffers
results in errors in the voltages of OUT118, VCOM OUT1,
and VCOM OUT2. The BUF01900 can be used to provide a
programmable VCOM output.
SDA
SCL
LD
A0
Analog
Digital
REFH
OUT17
V
COM OUT1
REFL
DA
C
R
e
g
is
te
rs
2
Control IF
OUT18
OUT1
OUT2
REFH OUT
REFL OUT
DA
C
R
e
g
is
te
rs
1
OTP
M
e
m
o
ry
P
rogr
am
C
o
mman
d
14.8V
0.2V
15V
2V5.5V
15V
0.2V
14.8V
GMA 3
GMA 4
GMA 19
GMA 20
V
COM OUT2
GMA 1
GMA 2
2V
COM Channels plus
18 Gamma Channels
Source
Driver
BUF20820
Figure 16. 20-Gamma Channel Solution—2 VCOM Channels Used as Additional Gamma Channels
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