ADD8502_15 Datasheet, PDF (1/16 Pages) Analog Devices – Integrated LCD Grayscale Generator

a
Integrated LCD
Grayscale Generator
ADD8502
FEATURES
Two Mask Programmable Sets of Five Reference Levels
Dual 10-Bit DACs for Flicker Offset and Range Adjustment
Integrated V_COM Switching
Single-Supply Operation: 5.0 V
Low Supply Current: 300 ␮A
Global Power Save Mode: 1 ␮A Max
Fast Settling Time for Load Change: 20 ␮s
Stable with 20 nF/100 ⍀ Loads
CMOS/TTL Input Levels
FUNCTIONAL BLOCK DIAGRAM
V_DD
VREF+
V_DD/2
10-BIT
DAC A
VREF–
REV2
VP0
VN0
A0
R
V_DD
GND
V0
R VP0
APPLICATIONS
Color TFT Cell Phones
Color TFT PDAs
R
VN4
A1
V1
V_L
GENERAL DESCRIPTION
SCK
The ADD8502 is an integrated, high accuracy, programmable
D_IN
grayscale generator. Two sets of five output reference voltages
CS-LD
are mask programmed to 0.2% resolution. The outputs switch
between the two sets of five levels. The reference levels are selected
from a 512 tap resistor network using a via mask.
DIGITAL
CORE
MUX
A2
V2
VP4
POWER
SAVE
LOGIC
VN4
R
A3
V3
ADD8502 includes two serially addressable, 10-bit digital-to-
analog converters (DACs) and five fast, low current buffers.
The dual DACs set the endpoint voltages applied to the resistor
network to adjust for flicker and range. The two power save modes
can reduce the total current to less than 1 µA and feature fast
recovery time from Shutdown/Sleep Mode. The ADD8502
accepts CMOS or TTL inputs for all controls, including the
common drive circuit levels.
ADD8502 operates over the industrial temperature range from
–40°C to +85°C and is available in a space-saving 24-lead
4 mm Ï« 4 mm frame chip scale package.
PSK
GS1
GS2
V_DD/2
VREF+
10-BIT
DAC B
VREF–
VP4
R
VN0
R
R
V_DD
A4
V4
V_COM
LOGIC
COM
COM_M
REV1 CM CV4
REV. 0
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© Analog Devices, Inc., 2002