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AD8509ARU-AD8511ARU
9- and 11-Channel, Muxed Input LCD Reference Drivers
FUNCTIONAL BLOCK DIAGRAM
IN A1
IN B1
IN A2
IN B1
IN A11
IN B11
A/B
V011
V02
V01
PIN CONFIGURATIONS
48-Lead TSSOP (RU Suffix)
NC = NO CONNECT
VO1
VCC
GND
VO2
VO3
VO4
VO5
VCC
GND
VO6
VO7
VO8
VO9
VO10
GND
VCC
A/B
INA1
INB1
INA2
INB2
INA3
INB3
INA4
INB4
INA5
INB5
INA6
INB6
INA7
INB7
INA8
INB8
INA9
INB9
INA10
VO11
INB10
INA11
INB11
NC = NO CONNECT
VCC
GND
VO1
VO2
VO3
VO4
VCC
GND
VO5
VO6
VO7
VO8
VO9
GND
VCC
A/B
INA1
INB1
INA2
INB2
INA3
INB3
INA4
INB4
INA5
INB5
INA6
INB6
INA7
INB7
INA8
INB8
INA9
INB9REV.0
9- and 11-Channel, Muxed Input
LCD Reference Drivers
FEATURES
Single-Supply Operation: 3.3 V to 5 V
High Output Current: 300 mA
Low Supply Current: 6 mA
Stable with 1000 pF Loads
Pin Compatible with LMC6009
Pin Compatible with CL-FP6131
APPLICATIONS
LCD Driver
GENERAL DESCRIPTIONThe AD8509 is a 9-channel (AD8511 an 11-channel) LCD
reference driver designed to drive 64 gray scale column drivers.
Each buffer has an A/B input used to select between two volt-
ages for LCD displays. These buffers are used to drive the resis-
tor ladders of LCD column drivers for gamma correction.
These LCD drivers have higher slew rates and output drive cur-
rent than similar competitive parts. This increases the stability
of the reference ladder, resulting in better gray scale and visual
performance.
The AD8509 and AD8511 are specified over the –20°C to +85°C
temperature range. They are available in 48-lead thin shrink small
outline (TSSOP) surface mount packages in tape and reel.
AD8509/AD8511–SPECIFICATIONS
ELECTRICAL CHARACTERISTICSSpecifications subject to change without notice.
(VS = 15 V, TA = 1258C, unless otherwise noted)
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
ABSOLUTE MAXIMUM RATINGS*Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 V
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS
Storage Temperature Range
RU Package. . . . . . . . . . . . . . . . . . . . . . 265°C to 1150°C
Operating Temperature Range
AD8509A/AD8511A. . . . . . . . . . . . . . . . . 220°C to 185°C
Junction Temperature Range
RU Package. . . . . . . . . . . . . . . . . . . . . . . 265°C to 1150°C
Lead Temperature Range (Soldering, 60 sec). . . . . . . 1300°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
NOTE
*θJA is specified for the worst case conditions, i.e., θJA specified for device sol-
dered in circuit board for surface mount packages.
ORDERING GUIDE* Available in 2,000 piece reels only.
Table I.MUX Function
TEMPERATURE – C–35–15105525456585Figure 1.Supply Current vs.
Temperature
Figure 4.Large Signal Transient
Response – Rising
Figure 7.Large Signal Transient
Response – Falling
LOAD CURRENT – mA0.1110010Figure 3.Output Voltage to Supply
Rail vs. Load Current
Figure 6.Large Signal Transient
Response – Rising
COMMON-MODE VOLTAGE – V015234Figure 2.Supply Current vs.
Common-Mode Voltage
Figure 5.Large Signal Transient
Response – Falling
AD8509/AD8511C3237–8–10/97
PRINTED IN U.S.A.
OUTLINE DIMENSIONSDimensions shown in inches and (mm).
48-Lead TSSOP
(RU Suffix)
0.319 (8.1)251
0.488 (12.4)
0.496 (12.6)
0.236 (6.0)0.244 (6.2)
PIN 1
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.0116 (0.27)
0.0067 (0.17)
0.0197 (0.5)
BSC
(1.10)
MAX
0.0079 (0.20)
0.0035 (0.090)
0.028 (0.70)
0.020 (0.50)
APPLICATIONSThe AD8509 and AD8511 are CMOS buffers with A/B inputs,
which are used to select between two different reference voltages
set up by an external resistor ladder. Input bias currents are or-
ders of magnitude less than competitive parts, allowing very
large resistor ladders to be used to save supply current. A guar-
anteed value of 50 nA is much higher than actual values and is
limited by leakage in the test system.
Buffer outputs are designed to drive resistive loads. They are
also stable with capacitive loads, so no resistors should be used
in series with these outputs to attain the best display perfor-
mance. Outputs have high slew rates and 6 μs settling times.
Each output is capable of delivering a minimum of 120 mA,
assuring fast response to varying loads.
The AD8509 is a 9-channel buffer and is similar to the LMC6009
in functionality. The AD8511 is an 11-channel buffer similar to the
CL-FP6131. However, the control to select either 9- or 11-channel
operation, the EN_11 pin of the CL-FP6131, is not available on
the AD8511. If 9-channel operation is desired, use the AD8509.
Power supply pins on the AD8509 and AD8511 have multiple
ground and VCC connections. Because of the high peak currents
that these buffers can deliver, it is strongly recommended that all
be connected, and that the VCC pins be suitably bypassed.
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