Single and Quad 18 V
Operational Amplifiers
AD8614/AD8644
FEATURES
Unity-gain bandwidth: 5.5 MHz
Low voltage offset: 1.0 mV
Slew rate: 7.5 V/μs
Single-supply operation: 5 V to 18 V
High output current: 70 mA
Low supply current: 800 μA/amplifier
Stable with large capacitive loads
Rail-to-rail inputs and outputs
PIN CONFIGURATIONS
OUT A
1
5
V+
AD8614
V–
2
+IN
3
TOP VIEW
(Not to Scale)
4
–IN
Figure 1. 5-Lead SOT-23
(RJ-5)
OUT A
1
–IN A
2
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
TOP VIEW
(Not to Scale)
14
OUT D
13
–IN D
APPLICATIONS
LCD gamma and V
COM
drivers
Modems
Portable instrumentation
Direct access arrangement
AD8644
12
+IN D
11
V–
10
+IN C
9
8
–IN C
OUT C
06485-002
06485-003
GENERAL DESCRIPTION
The AD8614 (single) and AD8644 (quad) are single-supply,
5.5 MHz bandwidth, rail-to-rail amplifiers optimized for LCD
monitor applications.
They are processed using the Analog Devices, Inc. high voltage,
extra fast complementary bipolar (HV XFCB) process. This
proprietary process includes trench-isolated transistors that
lower internal parasitic capacitance, which improves gain
bandwidth, phase margin, and capacitive load drive. The low
supply current of 800 μA (typical) per amplifier is critical for
portable or densely packed designs. In addition, the rail-to-rail
output swing provides greater dynamic range and control than
standard video amplifiers provide.
These products operate from supplies of 5 V to as high as 18 V.
The unique combination of an output drive of 70 mA, high
slew rates, and high capacitive drive capability makes the
AD8614/AD8644 an ideal choice for LCD applications.
The AD8614 and AD8644 are specified over the temperature
range of –20°C to +85°C. They are available in 5-lead SOT-23,
14-lead TSSOP, and 14-lead SOIC surface-mount packages in
tape and reel.
Figure 2. 14-Lead TSSOP
(RU-14)
OUT A
1
–IN A
2
+IN A
3
V+
4
14
13
OUT D
–IN D
12
+IN D
TOP VIEW
11
V–
(Not to Scale)
10
+IN C
+IN B
5
AD8644
–IN B
6
OUT B
7
9
8
–IN C
OUT C
Figure 3. 14-Lead Narrow Body SOIC
(R-14)
Rev. B
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: 781.461.3113 ©1999–2007 Analog Devices, Inc. All rights reserved.
06485-001
AD8614/AD8644
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution.................................................................................. 4
Typical Performance Characteristics ............................................. 5
Theory of Operation ........................................................................ 9
Output Short-Circuit Protection.................................................9
Input Overvoltage Protection ................................................... 10
Output Phase Reversal............................................................... 10
Power Dissipation....................................................................... 10
Unused Amplifiers ..................................................................... 10
Capacitive Load Drive ............................................................... 11
Direct Access Arrangement ...................................................... 11
A One-Chip Headphone/Microphone Preamplifier
Solution........................................................................................ 11
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
9/07—Rev. A to Rev B
Change to Current Noise Density in Table 1 ................................ 3
12/06—Rev. 0 to Rev. A
Updated Format..................................................................Universal
Deleted SPICE Model Availability Section.................................. 12
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
10/99—Revision 0: Initial Version
Rev. B | Page 2 of 16
AD8614/AD8644
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
5 V ≤ V
S
≤ 18 V, V
CM
= V
S
/2, T
A
= 25°C, unless otherwise noted.
1
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Voltage Gain
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
Settling Time
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
1
Symbol
V
OS
Conditions
Min
Typ
1.0
Max
2.5
3
400
500
100
200
V
S
Unit
mV
mV
nA
nA
nA
nA
V
dB
V/mV
V
mV
mA
mA
dB
mA
mA
V/μs
MHz
Degrees
μs
nV/√Hz
nV/√Hz
pA/√Hz
−20°C ≤ T
A
≤ +85°C
I
B
−20°C ≤ T
A
≤ +85°C
I
OS
−20°C ≤ T
A
≤ +85°C
CMRR
A
VO
V
OH
V
OL
I
SC
V
CM
= 0 V to V
S
V
OUT
= 0.5 V to V
S
– 0.5 V, R
L
= 10 kΩ
I
LOAD
= 10 mA
I
LOAD
= 10 mA
−20°C ≤ T
A
≤ +85°C
PSRR
I
SY
V
S
= ±2.25 V to ±9.25 V
−20°C ≤ T
A
≤ +85°C
SR
GBP
Φo
t
S
e
n
e
n
i
n
C
L
= 200 pF
7.5
5.5
65
3
12
11
1
0
60
10
V
S
− 0.15
35
30
80
65
70
75
150
5
80
150
110
0.8
1.1
1.5
0.01%, 10 V step
f = 1 kHz
f = 10 kHz
f = 10 kHz
All typical values are for V
S
= 18 V.
Rev. B | Page 3 of 16
AD8614/AD8644
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage
Input Voltage
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature Range (Soldering, 60 sec)
Rating
20 V
GND to V
S
−65°C to +150°C
−20°C to +85°C
−65°C to +150°C
300°C
THERMAL RESISTANCE
θ
JA
is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 3. Thermal Resistance
Package Type
5-Lead SOT-23 (RJ)
14-Lead TSSOP (RU)
14-Lead SOIC (R)
θ
JA
230
180
120
θ
JC
140
35
56
Unit
°C/W
°C/W
°C/W
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
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. B | Page 4 of 16
AD8614/AD8644
TYPICAL PERFORMANCE CHARACTERISTICS
50
45
SMALL SIGNAL OVERSHOOT (%)
V
S
= 18V
R
L
= 2kΩ
T
A
= 25°C
7.5
6.5
5.5
VOLTAGE (1V/DIV)
40
35
30
25
20
15
10
06485-004
V
S
= 5V
R
L
= 2kΩ
C
L
= 200pF
A
V
= 1
T
A
= 25°C
4.5
3.5
2.5
1.5
0.5
–0.5
–1.5
–2.5
TIME (1µs/DIV)
06485-007
+OS
–OS
5
0
10
100
1k
10k
CAPACITANCE (pF)
Figure 4. Small Signal Overshoot vs. Load Capacitance
Figure 7. Large Signal Transient Response, V
S
= 5 V
12
29
25
OUTPUT SWING FROM 0 TO ±V
8
0.1%
4
0.01%
21
VOLTAGE (4V/DIV)
V
S
= 18V
R
L
= 2kΩ
C
L
= 200pF
A
V
= 1
T
A
= 25°C
17
13
9
5
1
–3
0
–4
0.1%
0.01%
–8
06485-005
–7
–11
TIME (1µs/DIV)
–12
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
SETTLING TIME (µs)
Figure 5. Output Swing vs. Settling Time
Figure 8. Large Signal Transient Response, V
S
= 18 V
80
60
40
5V
≤
V
S
≤
18V
R
L
= 1MΩ
C
L
= 40pF
T
A
= 25°C
45
GAIN (dB)
20
0
135
180
VOLTAGE (50mV/DIV)
90
PHASE SHIFT (Degrees)
V
S
2
V
S
= 5V
≤
V
S
≤
18V
R
L
= 2kΩ
C
L
= 200pF
A
V
= 1
T
A
= 25°C
06485-009
06485-006
1k
10k
100k
1M
10M
100M
TIME (500ns/DIV)
FREQUENCY (Hz)
Figure 6. Open-Loop Gain and Phase Shift vs. Frequency
Figure 9. Small Signal Transient Response
Rev. B | Page 5 of 16
06485-008
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