BUF11702_16 Datasheet, PDF (10/28 Pages) Texas Instruments – MULTI-CHANNEL LCD GAMMA CORRECTION BUFFER

BUF11702
BUF07702
SLOS359F − MARCH 2001 − REVISED MAY 2004
TYPICAL CHARACTERISTICS
www.ti.com
AC CURVES
−3 dB BANDWIDTH
vs
SUPPLY VOLTAGE
1.25
BUF11702
Channel 9
1
BUF07702
Channel 5
0.75
VCOM Buffer
0.5
0.25
0
0
RL = 2 kΩ
CL = 100 pF
TA = +25°C
2 4 6 8 10 12 14 16
VDD − Supply Voltage − V
Figure 20
−3 dB BANDWIDTH
vs
LOAD CAPACITANCE
1.1
1
RL = 2 kΩ
VCOM Buffer
0.9
0.8
10 V
0.7
15 V
0.6
0.5
0.4
0.3
0.2
0.1
0
0
200 400
600
800
CL − Load Capacitance − pF
Figure 23
1000
INPUT-OUTPUT PHASE SHIFT
vs
LOAD CAPACITANCE
140
VDD = 10 V
120 ^{RL = 2 kΩ}
Channel 1
RNULL = 0
100 ^{f = −3 dB BW}
80
60
RNULL = 50
40
20
0
0 100 200 300 400 500 600 700 800 900 1000
CL − Load Capacitance − pF
Figure 26
10
−3 dB BANDWIDTH
vs
FREE-AIR TEMPERATURE
1.2
Gamma Channels
1
5V
10, 15 V
0.8
0.6
5, 10, 15 V
0.4
VCOM Buffer
0.2
0
0
RL = 2 kΩ
CL = 100 pF
10 20 30 40 50 60 70 80
TA − Free-Air Temperature − °C
Figure 21
−3 dB BANDWIDTH
vs
LOAD CAPACITANCE
3.5
RNULL = 0
3
VDD = 10 V
RL = 2 kΩ
Channel 1
2.5
2
1.5
1
0.5
0
0
RNULL = 50
200 400 600 800
CL − Load Capacitance − pF
Figure 24
1000
INPUT-OUTPUT PHASE SHIFT
vs
LOAD CAPACITANCE
60
55 _{RL = 2 kΩ}
50 ^{VCOM Buffer}
45 ^{f = −3 dB BW}
40
VDD = 5 V
35
30
25
VDD = 10 V
20
15
VDD = 15 V
10
5
0
0 100 200 300 400 500 600 700 800 900 1000
CL − Load Capacitance − pF
Figure 27
−3 dB BANDWIDTH
vs
LOAD CAPACITANCE
3.5
RL = 2 kΩ
3
Channel 1
2.5
10
2
V
1.5
15 V
1
0.5
0
0
200 400 600 800
CL − Load Capacitance − pF
Figure 22
1000
INPUT-OUTPUT PHASE SHIFT
vs
LOAD CAPACITANCE
140
RL = 2 kΩ
120 ^{Channel 1}
f = −3 dB BW 5 V
100
10 V
80
15 V
60
40
20
0
0 100 200 300 400 500 600 700 800 900 1000
CL − Load Capacitance − pF
Figure 25
POWER SUPPLY REJECTION RATIO
vs
FREQUENCY
80
70
60
50 _{VCOM Buffer}
40
VDD = 10 V
RL = 2 kΩ
CL = 100 pF
Gamma Channels
30
20
10
0
10
100 1 k 10 k 100 k 1 M 10 M
f − Frequency − Hz
Figure 28