AD ADD8706ARUZ 16 v 5 1-channel operational amplifier Datasheet

16 V 5 + 1-Channel
Operational Amplifier
ADD8706
PIN CONFIGURATION
Single-supply operation: 4.5 V to 16.5 V
Upper/lower buffers swing to VS/GND
Continuous output current: 35 mA
VCOM peak output current: 250 mA
Offset voltage: 15 mV
Slew rate: 6 V/µs
Unity gain stable with large capacitive loads
Supply current: 750 µA per amplifier
+IN A 1
16 OUT A
+IN B 2
15 OUT B
+IN C 3
14 OUT C
+IN D 4
+IN E 5
V+ 6
+IN F
7
–IN F 8
APPLICATIONS
ADD8706
13 OUT D
12 OUT E
11 V–
10 NC
9
OUT F
NC = NO CONNECT
TFT LCD monitor panels
TFT LCD notebook panels
Communications equipment
Portable instrumentation
Electronic games
ADC/DAC buffer
04352-0-001
FEATURES
Figure 1. 16-Lead TSSOP
GENERAL DESCRIPTION
The ADD8706 is a single-supply, 5-channel buffer with a
separate VCOM amplifier that has been optimized for today’s low
cost TFT LCD notebook and monitor panels. The top and
bottom channels swing to the top/bottom rails, respectively, and
can be used as end-point gamma references. The middle
channels are ideal for midpoint gamma references. The VCOM
amplifier provides very high continuous and peak currents. All
channels have excellent transient response as well as high slew
rate and capacitive load drive capability. The ADD8706 is
specified over the –40°C to +85°C temperature range. The
ADD8706 is available in a 16-lead TSSOP package.
Table 1. Input Output Characteristics
Channel
A
B
C
D
E
F
VIH
VS
VS – 1.7 V
VS – 1.7 V
VS – 1.7 V
VS – 1.7 V
VS – 1.7 V
VIL
GND + 1.7 V
GND
GND
GND
GND
GND
IO (mA)
15
15
15
15
15
35
ISC (mA)
150
150
150
150
150
250
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights 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. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2003 Analog Devices, Inc. All rights reserved.
ADD8706
TABLE OF CONTENTS
Electrical Characteristics ................................................................. 3
Theory.............................................................................................9
Absolute Maximum Ratings............................................................ 5
Input/Output Characteristics ......................................................9
ESD Caution.................................................................................. 5
Important Note..............................................................................9
Typical Performance Characteristics ............................................. 6
Outline Dimensions ....................................................................... 11
Application Information.................................................................. 9
Ordering Guide .......................................................................... 11
REVISION HISTORY
Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADD8706
ELECTRICAL CHARACTERISTICS
Table 2. VS = 16 V, VCM = VS/2, TA @ 25 °C, unless otherwise noted
Parameter
SUPPLY CHARACTERISTICS
Supply Voltage
Power Supply Rejection Ratio
Total Supply Current
Symbol
VS
PSRR
ISY
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Bias Current
VOS
∆VOS/∆T
IB
Condition
VS = 4 V to 17 V, –40°C ≤ TA ≤ +85°C
VO = VS/2, No Load
–40°C ≤ TA ≤ +85°C
Min
4.5
70
Typ
90
4.5
2
10
400
–40°C ≤ TA ≤ +85°C
–40°C ≤ TA ≤ +85°C
Input Offset Current
Amplifier F
Common-Mode Rejection Ratio
Amplifier F
Input Impedance
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage High (A)
Optimized for High Swing
IOS
CMRR
10
–40°C ≤ TA ≤ +85°C
–40°C ≤ TA ≤ +85°C
VCM = 0 to (VS – 1.7 V)
54
ZIN
CIN
VOH
Output Voltage High (B to D)
Optimized for Midrange
VOH
Output Voltage High (E)
Optimized for Low Swing
VOH
Output Voltage High (F)
Optimized for VCOM
VOH
Output Voltage Low (A)
Optimized for High Swing
VOL
Output Voltage Low (B–D)
Optimized for Midrange
VOL
Output Voltage Low (E)
Optimized for Low Swing
VOL
Output Voltage Low (F)
Optimized for VCOM
VOL
Continuous Output Current (A to E)
Continuous Output Current (F)
Peak Output Current (A to E)
Peak Output Current (F)
IOUT
IOUT
IPK
IPK
VIN = 16 V, IL = 100 µA
VIN = 16 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 14 V, IL = 100 µA
VIN = 14 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 14 V, IL = 100 µA
VIN = 14 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 16 V, IL = 100 µA
VIN = 16 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 1.7 V, IL = 100 µA
VIN = 1.7 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 0 V, IL = 100 µA
VIN = 0 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 0 V, IL = 100 µA
VIN = 0 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VIN = 0 V, IL = 100 µA
VIN = 0 V, IL = 5 mA
–40°C ≤ TA ≤ +85°C
VS = 16 V
VS = 16 V
VS = 16 V
VS = 16 V
Rev. 0 | Page 3 of 12
15.75
15.65
13.90
13.85
13.9
13.85
15.8
15.75
Max
Unit
16
V
dB
mA
mA
5.4
6
15
1100
1500
100
250
mV
µV/°C
nA
nA
nA
nA
95
400
1
dB
kΩ
pF
15.99
15.85
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
mV
mA
mA
mA
mA
14
13.985
14
13.99
15.995
15.9
1.70
1.71
5
200
5
80
5
50
15
35
50
200
1.730
1.725
300
350
200
300
150
250
ADD8706
Parameter
TRANSFER CHARACTERISTICS
Amplifier Gain
Buffer Gain
Buffer Gain Linearity
DYNAMIC PERFORMANCE
Slew Rate
Bandwidth
Phase Margin
Channel Separation
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Symbol
Condition
Min
Typ
Max
Unit
AVO
AVCL
1
0.995
0.995
10
0.9985
0.9980
0.01
1.005
1.005
NL
RL = 2 kΩ, VO = 0.5 to (VS – 2 V)
RL = 2 kΩ
–40°C ≤ TA ≤ +85°C
RL = 2kΩ, VO = 0.5 to (VS – 0.5 V)
V/mV
V/V
V/V
%
SR
BW
Øo
RL = 2 kΩ, CL = 200 pF
–3 dB, RL = 2 kΩ, CL = 40 pF
RL = 2 kΩ, CL = 40 pF
4
6
6
55
75
V/µs
MHz
Degrees
dB
en
f = 1 kHz
f = 10 kHz
f = 10 kHz
26
25
0.8
nV/√Hz
nV/√Hz
pA/√Hz
in
Rev. 0 | Page 4 of 12
ADD8706
ABSOLUTE MAXIMUM RATINGS
Table 3. ADD8706 Stress Ratings*
Table 4. Package Characteristics
Parameter
Supply Voltage (VS)
Input Voltage
Differential Input Voltage
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature Range
ESD Tolerance (HBM)
Package Type
16-Lead TSSOP (RU)
Rating
18 V
−0.5 V to VS + 0.5 V
VS
–65°C to +150°C
–40°C to +85°C
–65°C to +150°C
300°C
±1500 V
1
θJA1
180
θJC
35
Unit
°C/W
θJA is specified for worst-case conditions, i.e., θJA is specified for devices
soldered onto a circuit board for surface-mount packages.
*Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; 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.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
this product features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 5 of 12
ADD8706
TYPICAL PERFORMANCE CHARACTERISTICS
70
18
VS = 16V
INPUT OFFSET CURRENT (nA)
60
50
40
30
20
10
14
12
10
8
6
4
0
–10
–8
–6
–4
–2
0
2
4
INPUT OFFSET VOLTAGE (mV)
6
8
10
04532-0-025
2
0
–60
Figure 2. Input Offset Voltage, VS = 16 V
35
–40
–20
0
20
40
TEMPERATURE (°C)
60
80
100
04352-0-028
QUANTITY OF AMPLIFIERS
VS = 16V
16
Figure 5. Input Offset Current vs. Temperature
10k
VS = 16V
VS = 4.5V
SINK
30
A
∆OUTPUT VOLTAGE (mV)
QUANTITY OF AMPLIFIERS
1k
25
20
15
10
B, C, D
F
100
E
10
1
0
14
28
42
56
TCVOS (µV/°C)
70
84
98
0.1
0.001
0.1
1
LOAD CURRENT (mA)
10
100
Figure 6. Output Sink Voltage vs. Load Current, All Channels
Figure 3. Input Offset Voltage Drift, VS = 16 V
10k
400
VS = 16V
VS = 4.5V
SOURCE
A
B, C, D, E
200
∆OUTPUT VOLTAGE (mV)
1k
0
–200
–400
E
B
100
A
10
F
1
–600
–800
–60
D
C
–40
–20
0
20
40
TEMPERATURE (°C)
60
80
100
0.1
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
100
Figure 7. Output Source Voltage vs. Load Current, All Channels
Figure 4. Input Bias Current vs. Temperature
Rev. 0 | Page 6 of 12
04352-0-015
F
04352-0-027
INPUT BIAS CURRENT (nA)
0.01
04352-0-013
0
04352-0-026
5
ADD8706
0.76
A
1k
SUPPLY CURRENT/AMPLIFIER (mA)
F
100
B, C, D
10
E
0.1
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
100
04352-0-014
1
0.75
0.74
0.73
0.72
0.71
0.70
0.69
–60
Figure 8. Output Sink Voltage vs. Load Current, All Channels
–40
–20
80
100
100
A
10
F
0.1
0.001
0.01
0.1
1
LOAD CURRENT (mA)
10
100
04352-0-016
1
VS = 16V
100
80
–PSRR
60
+PSRR
40
20
0
100
1k
10k
100k
1M
10M
04352-0-018
POWER SUPPLY REJECTION RATIO (dB)
B, C, D, E
1k
1M
10M
FREQUENCY (Hz)
Figure 9. Output Source Voltage vs. Load Current, All Channels
Figure 12. PSRR vs. Frequency
0.9
140
VS = 16V
COMMON-MODE REJECTION (dB)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2
4
6
8
10
12
SUPPLY VOLTAGE (V)
14
16
18
04352-0-022
SUPPLY CURRENT PER AMPLIFIER (mA)
60
120
VS = 16V
SOURCE
0
0
20
40
TEMPERATURE (°C)
Figure 11. Supply Current vs. Temperature
10k
∆OUTPUT VOLTAGE (mV)
VS = 16V
04352-0-010
∆OUTPUT VOLTAGE (mV)
VS = 16V
SINK
04352-0-029
10k
120
100
80
60
40
20
0
100
Figure 10. Supply Current vs. Supply Voltage
1k
100k
10k
FREQUENCY (Hz)
Figure 13. CMRR vs. Frequency
Rev. 0 | Page 7 of 12
ADD8706
0
100
80
45
OVERSHOOT (%)
135
20
80
PHASE SHIFT (Degrees)
90
40
70
60
–OS
50
+OS
40
30
180
0
VS = ±16V
VIN = 100mV
AV = 1
RL = 10kΩ
90
60
GAIN (dB)
100
VS = 16V
RL = 10kΩ
CL = 40pF
20
100k
1M
FREQUENCY (Hz)
225
100M
10M
0
Figure 14. Frequency vs. Gain and Shift
10
100
CAPACITIVE LOAD (pF)
1k
04352-0-020
10k
04352-0-012
10
–20
1k
Figure 17. Overshoot vs. Capacitive Load
100
80
VS = 16V
RL = 2kΩ
CL = 100pF
VS = 16V
RL = 10kΩ
VOLTAGE (50mV/DIV)
60
40
GAIN (dB)
100pF
20
0
50pF
–20
540pF
–40
1040pF
–60
1M
10M
FREQUENCY (Hz)
100M
TIME (1µs/DIV)
04352-0-021
–100
100k
04352-0-008
–80
Figure 18. Small-Signal Transient Response
Figure 15. Gain vs. Capacitive Load
500
450
AV = 1
VS == 16V
RL = 2kΩ
CL = 100pF
400
VOLTAGE (2V/DIV)
CH. A–E
300
250
200
150
CH. F
100
0
100
1k
100k
10k
FREQUENCY (Hz)
1M
10M
TIME (1µs/DIV)
Figure 16. Impedance vs. Frequency
Figure 19. Large Signal Transient Response
Rev. 0 | Page 8 of 12
04352-0-013
50
04352-0-005
IMPEDANCE (Ω)
350
ADD8706
APPLICATION INFORMATION
THEORY
The ADD8706 is designed for use in LCD gamma correction
circuits. This is an ideal on-chip solution for low-end panels. It
provides five gamma voltages and a VCOM output. These gamma
voltages provide the reference voltages for the column driver
RDACs. Due to the capacitive nature of LCD panels, it is
necessary for these drivers to provide high capacitive load drive.
The VCOM output is the center voltage common to all the LCD
pixels. The VCOM circuit is common to all the pixels in the panel.
This requires the VCOM driver to supply continuous currents up
to 35 mA.
INPUT/OUTPUT CHARACTERISTICS
The ADD8706 has five buffers specifically designed for the
needs of an LCD panel. Figure 20 shows a typical gamma
correction curve for a normally white twisted nematic LCD
panel. The symmetric curve comes from the need to reverse the
polarity on the LC pixels to avoid “burning” in the image.
Therefore, the application requires gamma voltages that come
close to both supply rails. To accommodate this transfer
function, the five ADD8706 buffers have been designed with
three different buffer designs in one package.
VDD
VG1
Buffer A has an NPN emitter-follower input stage, which
provides an input range that includes the top rail, but is limited
to 1.7 V away from the bottom rail. It is designed to source
15 mA of continuous current, making this buffer ideal for
providing the top voltage on the RDAC string.
Buffers B, C, and D use a single-supply PNP input stage with an
intermediate common-mode voltage range. The output was
designed to sink or source up to 15 mA of continuous current.
The limited input range and equivalent sink and source current
make these buffers suitable for the middle voltage ranges on the
RDAC string.
Buffer E also uses a single-supply PNP input stage, but the
output is designed to sink only up to 15 mA of continuous
current. This buffer is designed for the RDAC’s lower range.
Amplifier F is designed with an input range limited to midscale
applications. It is capable of delivering 35 mA of continuous
current. These qualities make Amplifier F suitable for VCOM
applications.
IMPORTANT NOTE
VG2
GAMMA VOLTAGE
The outputs of the buffers and amplifier have been designed to
match the performance needs of the gamma correction and
VCOM circuits. All have rail-to-rail outputs, but the current drive
capabilities differ. The difference in current drive and input
voltage range determine the buffer and amplifier use.
Because of the asymmetric nature of Buffers A and E, care must
be taken to connect an input that forces the amplifiers to
operate in their most productive output states. Buffer A has very
limited sink capabilities, while Buffer E does not source well. Set
the Buffer A input to enable the amplifier output to source
current and set the Buffer E input to force a sinking output
current. This means making sure the input is above the
midpoint of the common-mode input range for Buffer A and
below the midpoint for Buffer E. Mathematically speaking,
make sure VIN > VS/2 for Buffer A and VIN < VS/2 for Buffer E.
VG3
VG4
VG5
VG6
VG7
VG8
VG9
VSS
0
16
32
GRAY SCALE BITS
48
64
04352-0-003
VG10
Figure 20. LCD Gamma Correction Curve
The nature of LCD panels introduces a large amount of
parasitic capacitance from the column drivers as well as the
capacitance associated with the liquid crystals via the common
plane. This makes capacitive drive capability an important
factor when designing the gamma correction circuit.
Figure 21 shows an application using the ADD8706 to generate
10 gamma outputs. Note that the five outputs are routed
through another resistor network to generate the extra five
output voltages, which feed into the column driver.
Rev. 0 | Page 9 of 12
ADD8706
VDD
ADD8706
COLUMN DRIVER
GAMMA 1
A
GAMMA 2
B
GAMMA 3
GAMMA 4
C
GAMMA 5
GAMMA 6
D
GAMMA 7
GAMMA 8
E
GAMMA 9
GAMMA 10
VDD
VCOM
VCOM
00000-x-000
F
Figure 21. ADD8706 Application Circuit
Rev. 0 | Page 10 of 12
ADD8706
OUTLINE DIMENSIONS
5.10
5.00
4.90
16
9
4.50
4.40
4.30
6.40
BSC
1
8
PIN 1
1.20 MAX
0.15
0.05
0.30
0.19
0.65
BSC
COPLANARITY
0.10
0.20
0.09
8°
0°
SEATING
PLANE
0.75
0.60
0.45
COMPLIANT TO JEDEC STANDARDS MO-153AB
Figure 22. 16-Lead Thin Shrink Small Outline Package [TSSOP] (RU)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
ADD8706ARUZ
ADD8706ARUZ-REEL
1
Temperature Range
−40°C to +85°C
−40°C to +85°C
Package Description
16-Lead TSSOP
16-Lead TSSOP
Z = Pb-free part.
Rev. 0 | Page 11 of 12
Package Option
RU-16
RU-16
ADD8706
NOTES
© 2003 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
C04352–0–10/03(0)
Rev. 0 | Page 12 of 12
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