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ADD8506 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADD8506
Beschreibung 6-Channel Muxed Input / LCD Gamma Reference Buffer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
ADD8506 Datasheet, Funktion
6-Channel, Muxed Input
Line Inversion LCD Gamma Buffer
ADD8506
FEATURES
Single-supply operation: 3.3 V to 6.5 V
Rail-to-rail input, rail-to-rail output
High output current: 380 mA
Low supply current: 3.9 mA
Stable with 1 nF loads
Wide temperature range: −40°C to +105°C
24-lead, Pb-free, TSSOP package
APPLICATIONS
LCD line inversion gamma references
Car navigation panels
Personal media player panels
GENERAL DESCRIPTION
The ADD8506 has 6-channel LCD gamma reference buffers
designed to drive column driver gamma inputs in line
inversion panels. Each buffer channel has an A/B input to
select between two gamma voltage curves. These buffer
channels drive the resistor ladders of LCD column drivers
for gamma correction. The ADD8506 outputs have high
slew rates and output drives that increase the stability of the
reference ladder, resulting in optimal gray scale and visual
performance.
The ADD8506 is specified over the −40°C to +105°C
temperature range. It is available in a 24-lead thin shrink small
outline (TSSOP), surface-mount, Pb-free package.
PIN CONFIGURATION DIAGRAM
INA1 1
INB1 2
INA2 3
INB2 4
INA3 5
INB3 6
INA4 7
INB4 8
INA5 9
INB5 10
INA6 11
INB6 12
24 VCC1
23 OUT1
22 OUT2
21 OUT3
20 VCC2
19 A/B
18 GND
17 GND
16 OUT4
15 OUT5
14 OUT6
13 VCC3
Figure 1.
tasheet4u.comRev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
aresponsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
.drights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
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© 2005 Analog Devices, Inc. All rights reserved.






ADD8506 Datasheet, Funktion
ADD8506
APPLICATIONS
The ADD8506 has CMOS buffers with A/B inputs to select
between two different reference voltages set up by an external
resistor ladder. Input bias currents are orders of magnitude less
than competitive parts. This allows the use of a very large
resistor ladder to save supply current.
The buffer outputs are designed to drive resistive or capacitive
loads. Therefore, to attain the best display performance, do not
use resistors in series with these outputs. Outputs have high
slew rates and 6 μs settling times. Each output delivers a
minimum of 120 mA, ensuring a fast response to varying loads.
Power supply pins on the ADD8506 have multiple ground
(GND) and supply (VCC) connections. Because of the high peak
currents that these buffers deliver, it is recommended that all
GND and VCC pins be connected and suitably bypassed.
Table 5. MUX Function
A/B Select
Logic High
Logic Low
Input
INAx
INBx
5V
0.1μF
RA1
RB1
1
RA2
RB2
2
3
RA3
RB3
4
5
RA4
RB4
6
7
RA5
RB5
8
9
RA6
RB6
10
101
RA7
RB7
5V 0.1μF
12
VCOM
(INVERTING SIGNAL)
5V
0.1μF
24 TO COLUMN
DRIVERS
23
22
21
20
19
18
17
16
15
14
13
NOTES
1. RAx RESISTORS ARE USED TO SET POSITIVE INVERSION GAMMA VOLTAGES.
2. RBx RESISTORS ARE USED TO SET NEGATIVE INVERSION GAMMA VOLTAGES.
Figure 7. Typical Application
Rev. 0 | Page 6 of 8

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