9- and 11-Channel, Muxed Input
LCD Reference Buffers
AD8509/AD8511
PIN CONFIGURATIONS
FEATURES
Single-supply operation: 3.3 V to 6.5 V
High output current: 300 mA
Low supply current: 6 mA
NC
NC
1
2
3
4
5
6
7
8
9
48 NC
47 NC
46 NC
45 NC
NC
INA1
INB1
INA2
INB2
INA3
INB3
INA4
INB4
1
2
3
4
5
6
7
8
9
48 NC
47 VO1
46 NC
45 NC
NC
INA1
INB1
INA2
INB2
INA3
INB3
Stable with 1000 pF loads
44
V
44
V
CC
CC
Pin compatible with LMC6009
Pin compatible with CL-FP6131
48-lead, Pb-free TSSOP/LFCSP packages
43 GND
42 VO1
41 VO2
40 VO3
39 VO4
43 GND
42 VO2
41 VO3
40 VO4
39 VO5
AD8509
AD8511
TOP VIEW
TOP VIEW
INA4 10
INB4 11
INA5 12
INB5 13
INA6 14
INB6 15
INA7 16
INB7 17
INA8 18
INB8 19
INA9 20
INB9 21
NC 22
(Not to Scale)
INA5 10
INB5 11
INA6 12
INB6 13
INA7 14
INB7 15
INA8 16
INB8 17
INA9 18
INB9 19
INA10 20
INB10 21
NC 22
(Not to Scale)
APPLICATION
LCD line inversion gamma references
38
V
38 V
CC
CC
37 GND
36 VO5
35 VO6
34 VO7
33 VO8
32 VO9
31 GND
37 GND
36 VO6
35 VO7
34 VO8
33 VO9
32 VO10
31 GND
GENERAL DESCRIPTION
The AD8509 and AD8511 are 9-channel and 11-channel LCD
reference buffers, respectively, designed to drive 64 gray scale
column drivers. Each buffer has an A/B input to select between
two voltages for LCD displays. These buffers drive the resistor
ladders of LCD column drivers for gamma correction. The LCD
drivers have higher slew rates and higher output drive currents
than similar competitive parts. This increases the stability of
the reference ladder, resulting in better gray scale and visual
performance.
30
V
30
V
CC
CC
29 A/B
28 NC
27 NC
26 NC
25 NC
29 A/B
28 NC
27 NC
26 VO11
25 NC
NC 23
INA11 23
INB11 24
NC 24
NC = NO CONNECT
NC = NO CONNECT
Figure 2. AD8509 and AD8511 48-Lead TSSOP (RV Suffix)
The AD8509 and AD8511 are specified over the −40°C to +85°C
temperature range. They are available in 48-lead, Pb-free TSSOP
packages in tape and reel. Additionally, the ADD8511 is available
in a 48-lead, Pb-free LFCSP package.
FUNCTIONAL BLOCK DIAGRAM
INA3
INB3
INA4
INB4
INA5
INB5
INA6
INB6
INA7
1
2
3
4
5
6
7
8
9
36 VO2
PIN 1
INDICATOR
35 VO3
34 VO4
33 VO5
INA1
VO1
INB1
32 V
CC
31 GND
30 VO6
29 VO7
28 VO8
27 VO9
26 VO10
25 GND
AD8511
INA2
TOP VIEW
(Not to Scale)
VO2
INB2
INB7 10
INA8 11
INB8 12
INA11
NC = NO CONNECT
VO11
INB11
A/B
Figure 3. AD8511 48-Lead LFCSP
Figure 1.
Rev. C
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