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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
16 V Rail-to-Rail Buffer Amplifiers AD8568/AD8569/AD8570
PIN CONFIGURATIONS 6-Lead SOT-23 (RT Suffix)
OUT A 1 IN A GND 2 3 6 5 4 OUT B V+ IN B
AD8568
10-Lead MSOP (RM Suffix)
OUT A 1 IN A 2 3 4 10 OUT D 9 IN D GND IN C OUT C
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 -40C to +85C 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.
V+ IN B
AD8569
8 7 6
OUT B 5
32-Lead LFCSP (CP Suffix)
32 NC 31 IN B 30 IN A 29 NC 28 NC 27 OUT A 26 OUT B 25 NC
V+ NC IN C IN D IN E IN F NC V+ 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17
PIN 1 INDICATOR
AD8570
TOP VIEW
GND NC OUT C OUT D OUT E OUT F NC GND
NC = NO CONNECT
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. 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 (c) Analog Devices, Inc., 2001
NC 9 IN G 10 IN H 11 NC 12 NC 13 OUT H 14 OUT G 15 NC 16
AD8568/AD8569/AD8570-SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (4.5 V V 16 V, V
S CM
= VS/2, TA = 25 C, unless otherwise noted.)
Min Typ 2 5 80 -0.5 Max 10 600 800 VS + 0.5 Unit mV V/C nA nA V k pF V V V V V mV mV mV mV mV mA mA V/V V/V % V dB A mA V/s MHz Degrees dB nV/Hz nV/Hz pA/Hz
Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Input Voltage Range Input Impedance Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High
Symbol VOS VOS/T IB ZIN CIN VOH
Conditions
-40C TA +85C -40C TA +85C
400 1 IL = 100 A VS = 16 V, IL = 5 mA -40C TA +85C VS = 4.5 V, IL = 5 mA -40C TA +85C IL = 100 A VS = 16 V, IL = 5 mA -40C TA +85C VS = 4.5 V, IL = 5 mA -40C TA +85C VS = 16 V RL = 2 k -40C TA +85C RL = 2 k, VO = 0.5 to (VS - 0.5 V) 0.995 0.995 VS - 0.005 15.95 4.38 5 42 95 35 250 0.9985 0.9980 0.01 1.005 1.005
15.85 15.75 4.2 4.1
Output Voltage Low
VOL
150 250 300 400
Continuous Output Current Peak Output Current TRANSFER CHARACTERISTICS Gain Gain Linearity POWER SUPPLY Supply Voltage Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Bandwidth Phase Margin Channel Separation NOISE PERFORMANCE Voltage Noise Density Current Noise Density
Specifications subject to change without notice.
IOUT IPK AVCL NL VS PSRR ISY
4.5 VS = 4 V to 17 V -40C TA +85C VO = VS/2, No Load -40C TA +85C RL = 10 k, CL = 200 pF -3 dB, RL = 10 k, CL = 10 pF RL = 10 k, CL = 10 pF 70 90 700
16
850 1
SR BW Oo
4
6 6 65 75 26 25 0.8
en en in
f = 1 kHz f = 10 kHz f = 10 kHz
-2-
REV. A
AD8568/AD8569/AD8570
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage (VS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V Input Voltage . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VS +0.5 V Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . VS Storage Temperature Range . . . . . . . . . . . . -65C to +150C Operating Temperature Range . . . . . . . . . . . -40C to +85C Junction Temperature Range . . . . . . . . . . . . -65C to +150C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300C
*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 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 6-Lead SOT-23 (RT) 10-Lead MSOP (RM) 32-Lead LFCSP (CP)
JA
1
JC
JB
2
Unit C/W C/W C/W
250 200 35
140 44 13
NOTES 1 JA is specified for worst case conditions, i.e., 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
Model* AD8568ART AD8569ARM AD8570ACP
Temperature Range -40C to +85C -40C to +85C -40C to +85C
Package Description 6-Lead SOT-23 10-Lead MSOP 32-Lead LFCSP
Package Option RT-6 RM-10 CP-32
Branding Information AWA AXA
*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
REV. A
-3-
AD8568/AD8569/AD8570 -Typical Performance Characteristics
100 90 80 TA = 25 C 4.5V < VS < 16V 0 VCM = VS/2 50 VS = 16V 100 150 VS = 4.5V 200 250 300 10 0 12 9 0 3 6 6 3 INPUT OFFSET VOLTAGE - mV 9 12 350 40 +25 TEMPERATURE - C +85
70 60 50 40 30 20
INPUT BIAS CURRENT - nA
QUANTITY - Amplifiers
TPC 1. Input Offset Voltage Distribution
TPC 4. Input Bias Current vs. Temperature
300 4.5V < VS < 16V
5 4
INPUT OFFSET CURRENT - nA
250
3 2 1 VS = 4.5V 0 1 2 3 4 VS = 16V
QUANTITY - Amplifiers
200
150
100
50
0 0
5
10
20
30
40 50 TCVOS -
60 V/ C
70
80
90
100
40
+25 TEMPERATURE - C
+85
TPC 2. Input Offset Voltage Drift Distribution
TPC 5. Input Offset Current vs. Temperature
0 VCM = VS /2
15.96 ILOAD = 5mA 15.95 VS = 16V 15.94
OUTPUT VOLTAGE - V
4.46 4.45 4.44 4.43 4.42 4.41 4.40 VS = 4.5V 4.39 4.38 4.37 4.36 40 +25 TEMPERATURE - C +85
INPUT OFFSET VOLTAGE - mV
0.25
0.50 VS = 16V 0.75
15.93 15.92 15.91 15.90 15.89 15.88 15.87
1.00 VS = 4.5V 1.25
1.50
15.86
40
+25 TEMPERATURE - C
+85
TPC 3. Input Offset Voltage vs. Temperature
TPC 6. Output Voltage Swing vs. Temperature
-4-
REV. A
AD8568/AD8569/AD8570
150 ILOAD = 5mA 135
0.80 VCM = VS /2
SUPPLY CURRENT/AMPLIFIER - mA
120
0.75 VS = 16V 0.70
OUTPUT VOLTAGE - mV
105 90 VS = 4.5V 75 60 45 VS = 16V 30 15 0 40 +25 TEMPERATURE - C +85
0.65
0.60 VS = 4.5V
0.55
0.50 40 +25 TEMPERATURE - C +85
TPC 7. Output Voltage Swing vs. Temperature
TPC 10. Supply Current/Amplifier vs. Temperature
0.9999 4.5V < VS < 16V VOUT = 0.5V TO 15V RL = 2k
GAIN ERROR - V/V
7 6 5 4 3 2 1
VS = 16V
0.9997
SLEW RATE - V/ s
VS = 4.5V
RL = 600 0.9995 40 +25 TEMPERATURE - C +85
0
RL = 10k CL = 200pF 40 +25 TEMPERATURE - C +85
TPC 8. Voltage Gain vs. Temperature
TPC 11. Slew Rate vs. Temperature
1k TA = 25 C SUPPLY CURRENT/AMPLIFIER - mA
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 TA = 25 C AV = 1 VO = VS /2
OUTPUT VOLTAGE - mV
100 VS = 4.5V
10
VS = 16V
1
0.1 0.001
0.01
0.1 1 LOAD CURRENT - mA
10
100
0
0
2
4
6 8 10 12 SUPPLY VOLTAGE - V
14
16
18
TPC 9. Output Voltage to Supply Rail vs. Load Current
TPC 12. Supply Current/Amplifier vs. Supply Voltage
REV. A
-5-
AD8568/AD8569/AD8570
10 5 1k 0 10k 5
18 16 14
OUTPUT SWING - Vp-p
12 10 8 6 4 2 0 10 100 1k 10k 100k 1M 10M FREQUENCY - Hz TA = 25 C VS = 16V AV = 1 RL = 10k DISTORTION < 1%
GAIN - dB
10 15 20
560
150 25 30 35 TA = 25 C VS = 8V VIN = 50mV rms CL = 40pF AV = 1 1M 10M FREQUENCY - Hz 100M
40 100k
TPC 13. Frequency Response vs. Resistive Loading
TPC 16. Closed-Loop Output Swing vs. Frequency
25 20 15 10 TA = 25 C VS = 8V VIN = 50mV rms RL = 10k AV = 1
160 140 TA = 25 C VS = 16V
POWER SUPPLY REJECTION - dB
120 100 80 +PSRR 60 40 PSRR 20 0 20
GAIN - dB
5 0 50pF 5 1040pF 10 15 20 25 100k 540pF 100pF
1M
10M FREQUENCY - Hz
100M
40 100
1k
10k 100k FREQUENCY - Hz
1M
10M
TPC 14. Frequency Response vs. Capacitive Loading
TPC 17. Power Supply Rejection Ratio vs. Frequency
500 450
POWER SUPPLY REJECTION - dB
160 140 120 100 +PSRR 80 60 40 20 0 20 PSRR TA = 25 C VS = 4.5V
400 350
IMPEDANCE -
300 250 200 150 100 50 0 100 1k 10k 100k FREQUENCY - Hz
VS = 4.5V
VS = 16V 1M 10M
40 100
1k
10k 100k FREQUENCY - Hz
1M
10M
TPC 15. Closed-Loop Output Impedance vs. Frequency
TPC 18. Power Supply Rejection Ratio vs. Frequency
-6-
REV. A
AD8568/AD8569/AD8570
1,000 TA = 25 C 4.5V VS 16V
100 90 80
OVERSHOOT - %
VOLTAGE NOISE DENSITY - nV/Hz
100
70 60 50 40 30 20 10
TA = 25 C VS = 4.5V VCM = 2.25V VIN = 100mV p-p AV = 1 RL = 10k
10
OS
+OS
1 10
1k 100 FREQUENCY - Hz
10k
0 10
100 LOAD CAPACITANCE - pF
1k
TPC 19. Voltage Noise Density vs. Frequency
TPC 22. Small Signal Overshoot vs. Load Capacitance
20 0
CHANNEL SEPARATION - dB
15
TA = 25 C 4.5V < VS < 16V
20 40 60 80 100 120 140 160 180 100
OUTPUT SWING FROM 0V TO
V
10
TA = 25 C VS = 8V RL = 10k
5 OVERSHOOT SETTLING TO 0.1% 0
5 UNDERSHOOT SETTLING TO 0.1% 10
15
1k
10k 100k 1M FREQUENCY - Hz
10M
100M
0
0.5
1.0 SETTLING TIME -
1.5 s
2.0
TPC 20. Channel Separation vs. Frequency
TPC 23. Settling Time vs. Step Size
100 90 80 70 TA = 25 C VS = 16V VCM = 8V VIN = 100mV p-p AV = 1 RL = 10k
0 0 0
VOLTAGE - 3V/DIV
TA = 25 C VS = 16V AV = 1 RL = 10k CL = 300pF
OVERSHOOT - %
60 50 40 OS 30 20 10 0 10 100 LOAD CAPACITANCE - pF 1k +OS
0 0 0 0 0 0 0
0
0
0 0 0 TIME - 2 s/DIV
0
0
0
TPC 21. Small Signal Overshoot vs. Load Capacitance
TPC 24. Large Signal Transient Response
REV. A
-7-
AD8568/AD8569/AD8570
0 0 0
VOLTAGE - 1V/DIV
0 TA = 25 C VS = 4.5V AV = 1 RL = 10k CL = 300pF 0 0
VOLTAGE - 50mV/DIV
TA = 25 C VS = 4.5V AV = 1 RL = 10k CL = 100pF
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0
0
0 0 0 TIME - 2 s/DIV
0
0
0
0
0
0 0 0 TIME - 1 s/DIV
0
0
0
TPC 25. Large Signal Transient Response
TPC 27. Small Signal Transient Response
0 0 0 TA = 25 C VS = 16V AV = 1 RL = 10k CL = 100pF
0 0 0 TA = 25 C VS = 16V AV = 1 RL = 10k
VOLTAGE - 50mV/DIV
VOLTAGE - 3V/DIV
0 0 0 0 0 0 0
0 0 0 0 0 0 0
0
0
0 0 0 TIME - 1 s/DIV
0
0
0
0
0
0 0 0 TIME - 40 s/DIV
0
0
0
TPC 26. Small Signal Transient Response
TPC 28. No Phase Reversal
-8-
REV. A
AD8568/AD8569/AD8570
APPLICATIONS Theory of Operation
MAXIMUM POWER DISSIPATION - Watts
This family of buffers is designed to drive large capacitive loads in LCD applications. Each has high output current drive, railto-rail input/output operation and can be powered from a single 16 V supply. They are also intended for other applications where low distortion and high output current drive are needed.
Input Overvoltage Protection
Figure 1 shows the maximum power dissipation versus temperature. To achieve proper operation, use the previous equation to calculate PDISS for a specific package at any given temperature, or see Figure 1.
1.0
0.75 10-LEAD MSOP 6-LEAD SOT-23 0.5
As with any semiconductor device, whenever the input exceeds either supply voltage, attention needs to be paid to the input overvoltage characteristics. As an overvoltage occurs, the amplifier could be damaged, depending on the voltage level and the magnitude of the fault current. When the input voltage exceeds either supply by more than 0.6 V, internal pin junctions will allow current to flow from the input to the supplies. This input current is not inherently damaging to the device as long as it is limited to 5 mA or less. If a condition exists using the buffers where the input exceeds the supply by more than 0.6 V, a series external resistor should be added. The size of the resistor can be calculated by using the maximum overvoltage divided by 5 mA. This resistance should be placed in series with the input exposed to an overvoltage.
Output Phase Reversal
0.25
0
35
15
5 25 45 AMBIENT TEMPERATURE - C
65
85
Figure 1. Maximum Power Dissipation vs. Temperature for 6- and 10-Lead Packages
THD + N
The buffer family is immune to phase reversal. Although the device's output will not change phase, large currents due to input overvoltage could damage the device. In applications where the possibility exists of an input voltage exceeding the supply voltage, overvoltage protection should be used as described in the previous section.
Power Dissipation
The buffer family features low total harmonic distortion. Figure 2 shows a graph of THD + N versus frequency. The Total Harmonic Distortion plus Noise for the buffer over the entire supply range is below 0.08%. When the device is powered from a 16 V supply, the THD + N stays below 0.03%. Figure 2 shows the AD8568 THD + N versus frequency performance.
THD + N - %
The maximum allowable internal junction temperature of 150C limits the buffer family Maximum Power Dissipation. As the ambient temperature increases, the maximum power dissipated by the buffer family must decrease linearly to maintain the maximum junction temperature. If this maximum junction temperature is exceeded momentarily, the part will still operate properly once the junction temperature is reduced below 150C. If the maximum junction temperature is exceeded for an extended period of time, overheating could lead to permanent damage of the device. The maximum safe junction temperature, TJMAX, is 150C. Using the following formula, we can obtain the maximum power that the buffer family can safely dissipate as a function of temperature.
PDISS = (TJMAX - TA)/JA
10
1
0.1
VS = VS =
2.5V 8V
where: PDISS = Power dissipation TJMAX = Maximum allowable junction temp (150C) TA = Ambient temperature of the circuit JA = AD856x package thermal resistance, junction-to-ambient The power dissipated by the device can be calculated as
PDISS = (VS - VOUT) ILOAD
0.01
20
100
1k FREQUENCY - Hz
10k
30k
Figure 2. AD8568 THD + N vs. Frequency
Short Circuit Output Conditions
The buffer family does not have internal short circuit protection circuitry. As a precautionary measure, do not short the output directly to the positive power supply or to ground. It is not recommended to operate the AD856x with more than 35 mA of continuous output current. The output current can be limited by placing a series resistor at the output of the amplifier whose value can be derived using the following equation:
where: VS = supply voltage VOUT = output voltage ILOAD = output load current
RX
VS 35 mA
For a 5 V single supply operation, RX should have a minimum value of 143 . REV. A -9-
AD8568/AD8569/AD8570
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
6-Lead SOT-23 (RT Suffix)
0.122 (3.10) 0.106 (2.70)
10-Lead MSOP (RM Suffix)
0.124 (3.15) 0.112 (2.84)
6
5
4
10
6
0.071 (1.80) 0.059 (1.50)
1 2 3
0.118 (3.00) 0.098 (2.50)
0.124 (3.15) 0.112 (2.84)
1 5
0.199 (5.05) 0.187 (4.75)
PIN 1 0.075 (1.90) BSC 0.051 (1.30) 0.035 (0.90) 0.037 (0.95) BSC
PIN 1 0.0197 (0.50) BSC 0.122 (3.10) 0.110 (2.79) 0.043 (1.09) 0.037 (0.94) 6 SEATING PLANE 0.011 (0.28) 0 0.003 (0.08) 0.022 (0.56) 0.021 (0.53) 0.120 (3.05) 0.112 (2.84)
0.057 (1.45) 0.035 (0.90) 10 0
0.038 (0.97) 0.030 (0.76)
0.006 (0.15) 0.016 (0.41) 0.002 (0.05) 0.006 (0.15) 0.022 (0.55) 0.014 (0.35)
0.006 (0.15) 0.000 (0.00)
0.020 (0.50) 0.010 (0.25)
SEATING PLANE
0.009 (0.23) 0.003 (0.08)
32-Lead LFCSP (CP Suffix)
0.024 (0.60) 0.017 (0.42) 0.009 (0.24) 0.024 (0.60) 0.017 (0.42) 25 0.009 (0.24) 24 0.010 (0.25) MIN
0.197 (5.0) BSC SQ
32
1
PIN 1 INDICATOR
TOP VIEW
0.187 (4.75) BSC SQ
0.012 (0.30) 0.009 (0.23) 0.007 (0.18) 0.020 (0.50) 0.016 (0.40) 0.012 (0.30)
17 16
BOTTOM VIEW
0.128 (3.25) 0.122 (3.10) SQ 0.116 (2.95)
98
12 MAX 0.035 (0.90) MAX 0.033 (0.85) NOM SEATING PLANE 0.020 (0.50) BSC
0.031 (0.80) MAX 0.026 (0.65) NOM
0.138 (3.50) REF
0.008 (0.20) REF CONTROLLING DIMENSIONS ARE IN MILLIMETERS. DIMENSIONS MEET JEDEC MO-220-VHHD-2.
0.002 (0.05) 0.0004 (0.01) 0.0 (0.00)
-10-
REV. A
AD8568/AD8569/AD8570 Revision History
Location Data Sheet changed from REV. 0 to REV. A. Page
Finalization of LFCSP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal
REV. A
-11-
-12-
C02612-.8-10/01(A)
PRINTED IN U.S.A.

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