REV. A
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
a
AD8568/AD8569/AD8570
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
© Analog Devices, Inc., 2001
16 V Rail-to-Rail
Buffer Amplifiers
PIN CONFIGURATIONS
6-Lead SOT-23
(RT Suffix)
GND
IN B
3
4
IN A
V+
2
5
OUT A
OUT B
1
6
AD8568
10-Lead MSOP
(RM Suffix)
5
6
IN A
V+
IN B
OUT C
IN D
GND
IN C
OUT D
2
9
3
8
4
7
1
10
AD8569
OUT B
OUT A
32-Lead LFCSP
(CP Suffix)
PIN 1
INDICATOR
TOP VIEW
24 GND
23 NC
22 OUT C
21 OUT D
V+ 1
NC 2
IN C 3
32 NC
20 OUT E
19 OUT F
18 NC
17 GND
NC 9
IN G 10
IN H 11
NC 12
NC 13
OUT H 1
4
OUT G 15
NC 16
IN D 4
IN E 5
IN F 6
NC 7
V+ 8
31 IN B
30 IN A
29 NC
28 NC
27 OUT A
26 OUT B
25 NC
AD8570
NC = NO CONNECT
FEATURES
Single-Supply Operation: 4.5 V to 16 V
Input Capability Beyond the Rails
Rail-to-Rail Output Swing
Continuous Output Current: 35 mA
Peak Output Current: 250 mA
Offset Voltage: 10 mV Max
Slew Rate: 6 V/ s
Stable with 1 F Loads
Supply Current
APPLICATIONS
LCD Reference Drivers
Portable Electronics
Communications Equipment
GENERAL DESCRIPTION
The AD8568, AD8569, and AD8570 are low-cost single-supply
buffer amplifiers with rail-to-rail input and output capability.
They are optimized for LCD monitor applications and built on
an advanced high-voltage CBCMOS process. The AD8568 includes
two buffers, the AD8569 includes four buffers, and the AD8570
includes eight buffers.
These LCD buffers have high slew rates, 35 mA continuous output
drive, and high capacitive load drive capability. They have wide
supply range and offset voltages below 10 mV.
The AD8568, AD8569, and AD8570 are specified over the –40
°C
to +85
°C temperature range. They are available on tape and reel,
with the AD8568 packaged in a 6-lead SOT-23, the AD8569 in a
10-lead MSOP, and the AD8570 in a 32-lead LFCSP.
–2–
REV. A
AD8568/AD8569/AD8570–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
V
OS
2
10
mV
Offset Voltage Drift
∆V
OS
/
∆T –40°C ≤ T
A
≤ +85°C
5
µV/°C
Input Bias Current
I
B
80
600
nA
–40
°C ≤ T
A
≤ +85°C
800
nA
Input Voltage Range
–0.5
V
S
+ 0.5
V
Input Impedance
Z
IN
400
k
Ω
Input Capacitance
C
IN
1
pF
OUTPUT CHARACTERISTICS
Output Voltage High
V
OH
I
L
= 100
µA
V
S
– 0.005
V
V
S
= 16 V, I
L
= 5 mA
15.85
15.95
V
–40
°C ≤ T
A
≤ +85°C
15.75
V
V
S
= 4.5 V, I
L
= 5 mA
4.2
4.38
V
–40
°C ≤ T
A
≤ +85°C
4.1
V
Output Voltage Low
V
OL
I
L
= 100
µA
5
mV
V
S
= 16 V, I
L
= 5 mA
42
150
mV
–40
°C ≤ T
A
≤ +85°C
250
mV
V
S
= 4.5 V, I
L
= 5 mA
95
300
mV
–40
°C ≤ T
A
≤ +85°C
400
mV
Continuous Output Current
I
OUT
35
mA
Peak Output Current
I
PK
V
S
= 16 V
250
mA
TRANSFER CHARACTERISTICS
Gain
A
VCL
R
L
= 2 k
Ω
0.995
0.9985
1.005
V/V
–40
°C ≤ T
A
≤ +85°C
0.995
0.9980
1.005
V/V
Gain Linearity
NL
R
L
= 2 k
Ω, V
O
= 0.5 to (V
S
– 0.5 V)
0.01
%
POWER SUPPLY
Supply Voltage
V
S
4.5
16
V
Power Supply Rejection Ratio
PSRR
V
S
= 4 V to 17 V
–40
°C ≤ T
A
≤ +85°C
70
90
dB
Supply Current/Amplifier
I
SY
V
O
= V
S
/2, No Load
700
850
µA
–40
°C ≤ T
A
≤ +85°C
1
mA
DYNAMIC PERFORMANCE
Slew Rate
SR
R
L
= 10 k
Ω, C
L
= 200 pF
4
6
V/
µs
Bandwidth
BW
–3 dB, R
L
= 10 k
Ω, C
L
= 10 pF
6
MHz
Phase Margin
Øo
R
L
= 10 k
Ω, C
L
= 10 pF
65
Degrees
Channel Separation
75
dB
NOISE PERFORMANCE
Voltage Noise Density
e
n
f = 1 kHz
26
nV/
√Hz
e
n
f = 10 kHz
25
nV/
√Hz
Current Noise Density
i
n
f = 10 kHz
0.8
pA/
√Hz
Specifications subject to change without notice.
(4.5 V
≤ V
S
≤ 16 V, V
CM
= V
S
/2, T
A
= 25 C, unless otherwise noted.)
–3–
AD8568/AD8569/AD8570
REV. A
ABSOLUTE MAXIMUM RATINGS
*
Supply Voltage (V
S
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
S
+0.5 V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . V
S
Storage Temperature Range . . . . . . . . . . . . –65
°C to +150°C
Operating Temperature Range . . . . . . . . . . . –40
°C to +85°C
Junction Temperature Range . . . . . . . . . . . . –65
°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300
°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Package Type
JA
1
JC
JB
2
Unit
6-Lead SOT-23 (RT)
250
140
°C/W
10-Lead MSOP (RM)
200
44
°C/W
32-Lead LFCSP (CP)
35
13
°C/W
NOTES
1
θ
JA
is specified for worst case conditions, i.e.,
θ
JA
is specified for device soldered
onto a circuit board for surface mount packages.
2
JB
is applied for calculating the junction temperature by reference to the board
temperature.
ORDERING GUIDE
Temperature
Package
Package
Branding
Model
*
Range
Description
Option
Information
AD8568ART
–40
°C to +85°C
6-Lead SOT-23
RT-6
AWA
AD8569ARM
–40
°C to +85°C
10-Lead MSOP
RM-10
AXA
AD8570ACP
–40
°C to +85°C
32-Lead LFCSP
CP-32
*Available in reels only.
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
the AD8568/AD8569/AD8570 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.
WARNING!
ESD SENSITIVE DEVICE
–4–
AD8568/AD8569/AD8570
REV. A
INPUT OFFSET VOLTAGE – mV
100
0
12
9
Q
U
ANTITY – Amplifier
s
6
3
0
3
6
9
12
90
50
30
20
10
80
70
40
60
T
A
= 25 C
4.5V < V
S
< 16V
TPC 1. Input Offset Voltage Distribution
TCVOS – V/ C
300
150
0
0
100
10
Q
U
ANTITY
–
Amplifier
s
20
30
40
50
60
70
80
90
250
200
100
50
4.5V < V
S
< 16V
TPC 2. Input Offset Voltage Drift Distribution
TEMPERATURE – C
0
0.25
1.50
40
INPUT OFFSET VOLTAGE
–
mV
+25
+85
0.50
0.75
1.00
1.25
V
CM
= V
S
/2
V
S
= 16V
V
S
= 4.5V
TPC 3. Input Offset Voltage vs. Temperature
TEMPERATURE – C
0
50
350
40
INPUT BIAS CURRENT
–
nA
+25
+85
150
200
250
300
V
CM
= V
S
/2
V
S
= 16V
V
S
= 4.5V
100
TPC 4. Input Bias Current vs. Temperature
TEMPERATURE – C
5
5
40
INPUT OFFSET CURRENT
–
nA
+25
+85
2
3
4
V
S
= 16V
V
S
= 4.5V
1
4
3
2
1
0
TPC 5. Input Offset Current vs. Temperature
TEMPERATURE – C
15.96
15.86
40
OUTPUT VOLTAGE
–
V
+25
+85
15.89
15.88
15.87
V
S
= 16V
V
S
= 4.5V
15.90
15.95
15.94
15.93
15.92
15.91
I
LOAD
= 5mA
4.46
4.36
4.39
4.38
4.37
4.40
4.45
4.44
4.43
4.42
4.41
TPC 6. Output Voltage Swing vs. Temperature
–Typical Performance Characteristics
–5–
AD8568/AD8569/AD8570
REV. A
TEMPERATURE – C
150
0
40
OUTPUT VOLTAGE
–
mV
+25
+85
45
30
15
V
S
= 16V
V
S
= 4.5V
60
135
120
105
90
75
I
LOAD
= 5mA
TPC 7. Output Voltage Swing vs. Temperature
TEMPERATURE – C
0.9999
0.9995
40
GAIN ERROR
–
V/V
+25
+85
R
L
= 2k
4.5V < V
S
< 16V
V
OUT
= 0.5V TO 15V
0.9997
R
L
= 600
TPC 8. Voltage Gain vs. Temperature
LOAD CURRENT – mA
10
0.1
0.001
100
0.01
OUTPUT V
O
L
T
A
GE
–
mV
0.1
1
10
1
100
1k
T
A
= 25 C
V
S
= 16V
V
S
= 4.5V
TPC 9. Output Voltage to Supply Rail vs. Load Current
TEMPERATURE – C
0.80
0.50
40
SUPPLY CURRENT/AMPLIFIER
–
mA
+25
+85
0.65
0.60
0.55
V
S
= 16V
V
S
= 4.5V
0.70
V
CM
= V
S
/2
0.75
TPC 10. Supply Current/Amplifier vs. Temperature
TEMPERATURE – C
7
0
40
SLEW RATE
–
V/
s
+25
+85
3
2
1
V
S
= 16V
V
S
= 4.5V
4
R
L
= 10k
C
L
= 200pF
5
6
TPC 11. Slew Rate vs. Temperature
SUPPLY VOLTAGE – V
1.0
0
0
18
2
SUPPL
Y CURRENT/AMPLIFIER
–
mA
4
6
8
10
12
14
16
0.9
0.5
0.3
0.2
0.1
0.8
0.7
0.4
0.6
T
A
= 25 C
A
V
= 1
V
O
= V
S
/2
TPC 12. Supply Current/Amplifier vs. Supply Voltage
–6–
AD8568/AD8569/AD8570
REV. A
FREQUENCY – Hz
10
40
100k
100M
GAIN
–
dB
10M
1M
35
30
25
20
15
10
5
5
0
1k
10k
560
150
T
A
= 25 C
V
S
= 8V
V
IN
= 50mV rms
C
L
= 40pF
A
V
= 1
TPC 13. Frequency Response vs. Resistive Loading
FREQUENCY – Hz
25
100k
100M
GAIN
–
dB
10M
1M
25
20
15
10
5
20
0
1040pF
T
A
= 25 C
V
S
= 8V
V
IN
= 50mV rms
R
L
= 10k
A
V
= 1
10
5
15
50pF
100pF
540pF
TPC 14. Frequency Response vs. Capacitive Loading
FREQUENCY – Hz
100
10M
1k
IMPED
ANCE
–
10k
100k
1M
500
450
0
400
350
300
250
200
150
100
V
S
= 16V
V
S
= 4.5V
50
TPC 15. Closed-Loop Output Impedance vs. Frequency
OUTPUT SWING
–
Vp-p
FREQUENCY – Hz
10M
1M
100k
10k
1k
100
10
0
2
4
6
8
10
12
14
16
18
T
A
= 25 C
V
S
= 16V
A
V
= 1
R
L
= 10k
DISTORTION < 1%
TPC 16. Closed-Loop Output Swing vs. Frequency
FREQUENCY – Hz
100
10M
1k
PO
WER SUPPL
Y REJECTION
–
dB
10k
100k
1M
160
140
40
120
100
80
60
40
20
0
+PSRR
20
PSRR
T
A
= 25 C
V
S
= 16V
TPC 17. Power Supply Rejection Ratio vs. Frequency
FREQUENCY – Hz
100
10M
1k
PO
WER SUPPL
Y REJECTION
–
dB
10k
100k
1M
160
140
40
120
100
80
60
40
20
0
+PSRR
20
PSRR
T
A
= 25 C
V
S
= 4.5V
TPC 18. Power Supply Rejection Ratio vs. Frequency
–7–
AD8568/AD8569/AD8570
REV. A
FREQUENCY – Hz
1,000
100
1
10
10k
100
V
O
L
T
A
GE NOISE DENSITY
–
nV/
√
Hz
1k
10
T
A
= 25 C
4.5V V
S
16V
TPC 19. Voltage Noise Density vs. Frequency
CHANNEL SEP
ARA
TION
–
dB
FREQUENCY – Hz
100M
10M
1M
100k
10k
1k
100
180
140
120
100
80
60
40
20
0
20
T
A
= 25 C
4.5V < V
S
< 16V
160
TPC 20. Channel Separation vs. Frequency
LOAD CAPACITANCE – pF
100
90
0
10
1k
100
O
VERSHOO
T
–
%
80
70
60
50
40
30
20
10
T
A
= 25 C
V
S
= 16V
V
CM
= 8V
V
IN
= 100mV p-p
A
V
= 1
R
L
= 10k
OS
+OS
TPC 21. Small Signal Overshoot vs. Load Capacitance
LOAD CAPACITANCE – pF
100
90
0
10
1k
100
O
VERSHOO
T
–
%
80
70
60
50
40
30
20
10
T
A
= 25 C
V
S
= 4.5V
V
CM
= 2.25V
V
IN
= 100mV p-p