Document
Advanced Analog Technology, Inc.
AAT7201
Details are subject to change without notice
10+1-Channel Buffer for TFT LCD
Features
z z z z z z 10 Channels with Output Current: +30mA (MAX) 1 Vcom with Output Current: +100mA (MAX) Unity Gain Buffer Capable of Driving Large Capacitive Loads Input Range Matched to LCD Reference Requirements
General Description
The AAT7201 is a 10+1-channel buffer designed to increase the driving capability for thin film transistor liquid crystal display (TFT LCD). This device includes a Vcom buffer circuit, four rail-to-rail buffer amplifier circuits and six buffer amplifier circuits. Each buffer is capable of driving heavy capacitive loads and offering fast current loading ( Vcom : 100mA, the others: 30mA). AAT7201 comes in a space-saving TQFP48 package, which makes it an ideal component in LCD TV and monitors.
VDD Specified for 6.5V to 16.0V TQFP48 Package
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Pin Configuration
TOP VIEW
TQFP48
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Advanced Analog Technology, Inc.
AAT7201
Pin Description
Pin No. Name I/O Description
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
o9 o8 o7 o6 NC NC GND VDD NC NC o5 o4 o3 NC VDD NC NC o2 GND o1 GND VDD i1 i2 i3 i4 i5 NC NC VDD
O O O O I I O O O I O I O I I I I I I I I
Buffer Channel 9 Output Buffer Channel 8 Output Buffer Channel 7 Output Buffer Channel 6 Output Ground Power Supply Buffer Channel 5 Output Buffer Channel 4 Output Buffer Channel 3 Output Power Supply Buffer Channel 2 Output Ground Buffer Channel 1 Output Ground Power Supply Buffer Channel 1 Input Buffer Channel 2 Input Buffer Channel 3 Input Buffer Channel 4 Input Buffer Channel 5 Input Power Supply
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Advanced Analog Technology, Inc.
AAT7201
Pin Description (Cont.)
Pin No. 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Name GND NC NC i6 i7 i8 i9 i10 I com I/O I I I I I I I I I I I O O Description Ground Buffer Channel 6 Input Buffer Channel 7 Input Buffer Channel 8 Input Buffer Channel 9 Input Buffer Channel 10 Input Com Buffer Input Power Supply Ground Power Supply Ground Com Buffer Output Buffer Channel 10 Output
NC NC NC VDD GND VDD GND O com o10
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Advanced Analog Technology, Inc.
AAT7201
Absolute Maximum Ratings
CHARACTERISTICS Supply Voltage SYMBOL VDD VALUE +18
−0.5 to VDD + 0.5 −0.5 to VDD + 0.5
± 30 ± 100 +125 − 20 to +85 − 45 to +125
UNIT V
Input Voltage Output Voltage Output Loading Current for Gamma , Rail-to-Rail Buffer Output Loading Current for Com Buffer Maximum Junction Temperature Operating Temperature Storage Temperature Lead Temperature (Soldering for10 seconds)
VI VO IL TJ TC
Tstorage
-
V V mA mA o C
o o o
C C C
260
Note 1: Value beyond absolute maximum ratings may cause permanent damage to the device.
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Advanced Analog Technology, Inc.
AAT7201
Electrical Characteristics (VDD=10V, TC=25oC unless otherwise specified.)
Power Supply Performance Parameter Test Conditions Min Typ Max Units
VDD varies from 6.5V to Power Supply Rejection PSRR Ratio 16.0V IS Supply Current
Input Characteristics Parameter Test Conditions
-
80 9
-
dB mA
Min
Typ
Max
Units
Input Offset Voltage Input Bias Current
VOS
IB
VI = VDD /2, VO = VDD /2 VI = VDD /2 , VO = VDD /2
-
2 2
12 50
mV nA
Output Characteristics Parameter Test Conditions Min Typ Max Unit
Output Swing Low
VOL
I L =5mA (Buffer 1, 2, 9, 10) VI =0V I L =10mA(Buffer 3, 4,…, 7, 8) VI =1V I L = − 5 mA (Buffer 1, 2, 9, 10) VI =10V I L = − 10 mA (Buffer 3, 4,…, 7, 8) VI =9V I L =10mA I L = − 10 mA I L =50mA I L = − 50 mA (Buffer 1~10 ) (Com Buffer) VI =5V VI =5V VI =5V VI =5V
9.85 8.95 4.96 4.95 -
0.08 1.02 9.92 8.98 5.02 4.98 5.03 4.97 +70 +180
0.15 1.05 5.04 5.05 -
V V V V V V V V mA mA
Output Swing High
VOH
Output Swing (Buffer 3, 4,…, 7, 8) Output Swing (COM)
VOL VOH VOL VOH I SC
Short Circuit Current
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Advanced Analog Technology, Inc.
AAT7201
Electrical Characteristics (VDD=10V, TC=25oC unless otherwise specified.) (Cont.) AC Characteristics
Parameter Test Conditions Min Typ Max Units
Slew Rate (Note 2) Settling Time
SR ts
VI =2V to 8V, 20% to 80% VI =4.5V to 5.5V VI =5.5V to 4.5V 0.1% 0.1%
-
1 5
-
V µs
µs
Note 2: Slew rate is measured on rising and falling edges.
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Advanced Analog Technology, Inc.
AAT7201
Block Diagram
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Advanced Analog Technology, Inc.
AAT7201
Application Circuit
Inc
Icomp
Ocomp
10Ω 10µF
Outc
In1
I1
O1
10Ω 1µF
Out1
In2
I2
O2
10Ω 1µF
Out2
In3
I3
O3.