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Details, datasheet, quote on part number:AD8644A
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Datasheet text preview:
a
FEATURES Unity Gain Bandwidth: 5.5 MHz Low Voltage Offset: 1.0 mV Slew Rate: 7.5 V/ s Single-Supply Operation: 5 V to 18 V High Output Current: 70 mA Low Supply Current: 800 A/Amplifier Stable with Large Capacitive Loads Rail-to-Rail Inputs and Outputs APPLICATIONS LCD Gamma and VCOM Drivers Modems Portable Instrumentation Direct Access Arrangement
Single and Quad +18 V Operational Amplifiers AD8614/AD8644
PIN CONFIGURATIONS 5-Lead SOT-23 (RT Suffix)
OUT A 1 V12 +IN 3 5 V+
AD8614
4 IN
4-Lead TSSOP (RU Suffix)
OUT A IN A IN A V IN B IN B OUT B 1 14 UT D ND IN D O VI IN C IN C OUT C
7
8
GENERAL DESCRIPTION
AD8644
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 Analog Devices high voltage, high speed, complementary bipolar process--HV XFCB. 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 (typ) 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.
14-Lead Narrow Body SO (R Suffix)
OUT A 1 IN A 2 +IN A 3 V+ 4 +IN B 5 IN B 6 OUT B 7
14 OUT D 13 IN D 12 +IN D
AD8644
11 V 10 +IN C 9 8
IN C OUT C
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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 which 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 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999
AD8614/AD8644SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (5 V V 18 V, V
S CM
= VS/2, TA = 25 C unless otherwise noted)
Min Typ 1.0 80 5 0 60 10 75 150 Max 2.5 3 400 500 100 200 VS Unit mV mV nA nA nA nA V dB V/mV V mV mA mA dB mA mA V/µs MHz Degrees µs nV/ H z n V / H z pA/ Hz
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 PSRR Supply Current / Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin Settling Time NOISE PERFORMANCE Voltage Noise Density Current Noise Density
NOTE All typical values are for VS = 18 V. Specifications subject to change without notice.
Symbol V OS IB I OS CMRR A VO V OH V OL I SC
Conditions
20°C TA +85°C 20°C TA +85°C 20°C TA +85°C VCM = 0 V to V S VOUT = 0.5 V to VS 0.5 V, RL = 10 k ILOAD = 10 mA ILOAD = 10 mA 20°C TA +85°C VS = ± 2.25 V to ± 9.25 V 20°C TA +85°C CL = 200 pF 0.01%, 10 V Step f = 1 kHz f = 10 kHz f = 10 kHz
VS 0.15 65 35 70 30 80 110 0.8
150
PSRR Isy
1.1 1.5
SR GBP o tS en en in
7.5 5.5 65 3 12 11 1
ABSOLUTE MAXIMUM RATINGS
1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS Storage Temperature Range . . . . . . . . . . . . 65°C to +150°C Operating Temperature Range . . . . . . . . . . . 20°C to +85°C Junction Temperature Range . . . . . . . . . . . . 65°C to +150°C Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300°C
NOTES 1 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 5-Lead SOT-23 (RT) 14-Lead TSSOP (RU) 14-Lead SOIC (R)
JA1 230 180 120
JC 140 35 56
Unit °C/W °C/W °C/W
NOTE 1 JA is specified for worst-case conditions, i.e., JA is specified for device soldered onto a circuit board for surface mount packages.
ORDERING GUIDE
Model
Temperature Range
Package Description
Package Option
AD8614ART1 20°C to +85°C AD8644ARU2 20°C to +85°C AD8644AR2 20°C to +85°C
NOTES 1 Available in 3,000 or 10,000 piece reels. 2 Available in 2,500 piece reels only.
5-Lead SOT-23 RT-5 14-Lead TSSOP RU-14 14-Lead SOIC R-14
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 AD8614/AD8644 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
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Typical Performance Characteristics AD8614/AD8644
50
SMALL SIGNAL OVERSHOOT %
V
45 40 35 30 25 20 15 10 5 0
VS = 18V RL = 2k TA = 25 C
12 80 8 0.1% 0.01% 40 GAIN dB 20 0 5V VS 18V RL = 1M CL = 40pF TA = 25 C 90 135 180 PHASE SHIFT Degrees 60 45
OUTPUT SWING FROM 0 TO
4
0 4 8 12
+OS OS
0.1%
0.01%
10
100 1k CAPACITANCE pF
10k
0
0.5
1.0 1.5 2.0 2.5 SETTLING TIME s
3.0
3.5
1k
10k
100k 1M 10M FREQUENCY Hz
100M
Figure 1. Small Signal Overshoot vs. Load Capacitance
Figure 2. Settling Time
Figure 3. Open-Loop Gain and Phase vs. Frequency
7.5 6.5 5.5 VOLTAGE 1V/Div 4.5 3.5 2.5 1.5 0.5 0.5 1.5 2.5
29 VS = 5V RL = 2k CL = 200pF AV = 1 TA = 25 C 25 21 VOLTAGE 4V/Div 17 13 9 5 1 3 7 11 TIME 1 s/Div TIME 1 s/Div TIME 500ns/Div VS = 18V RL = 2k CL = 200pF AV = 1 TA = 25 C
VOLTAGE 50mV/Div
VS 2 VS = 5V VS RL = 2k CL = 200pF AV = 1 TA = 25 C 18V
Figure 4. Large Signal Transient Response
Figure 5. Large Signal Transient Response
Figure 6. Small Signal Transient Response
10k SUPPLY CURRENT/AMPLIFIER A 5V VS 18V TA = 25 C OUTPUT VOLTAGE mV 1k
1,000 900 800 700 600 500 400 300 200 100 0 0 1 23 45 678 SUPPLY VOLTAGE Volts 9 10 TA = 25 C
INPUT BIAS CURRENT nA
400 300 VS = 200 100 0 100 200 300 400 2.5 1.5 0.5 0.5 1.5 COMMON-MODE VOLTAGE Volts 2.5 2.5V
100
SINK 10 SOURCE
1 0.001
0.01 0.1 1 10 LOAD CURRENT mA
100
Figure 7. Output Voltage to Supply Rail vs. Load Current
Figure 8. Supply Current vs. Supply Voltage
Figure 9. Input Bias Current vs. Common-Mode Voltage
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AD8614/AD8644
400 300 INPUT BIAS CURRENT nA VS = 200 100 0 100 200 300 400 9 75 3 101 3 5 7 COMMON-MODE VOLTAGE Volts 9 9V QUANTITY Amplifiers 180 SUPPLY CURRENT/AMPLIFIER mA 160 140 120 100 80 60 40 20 0 2 1.5 1 0.5 0 0.5 1 1.5 INPUT OFFSET VOLTAGE mV 2 2.5V VS TA = 25 C 9V 1.0 VS = 18V 0.9
0.8
0.7 VS = 5V 0.6
0.5
35
15
5 25 45 TEMPERATURE C
65
85
Figure 10. Input Bias Current vs. Common-Mode Voltage
Figure 11. Input Offset Voltage Distribution
Figure 12. Supply Current vs. Temperature
6
20 18
00 5V VS 18V TA = 25 C 240
5 OUTPUT SWING V p-p
OUTPUT SWING V p-p
IMPEDANCE
4
VS = 5V AVCL = 1 RL = 2k TA = 25 C
16 14 12 10 8 6 4 2 VS = 18V AVCL = 1 RL = 2k TA = 25 C
3
180
3
120
2
1 0 100
60 AV = 100
1k 10k 100k FREQUENCY Hz 1M 10M
AV = 10
AV = 1
1k
10k 100k FREQUENCY Hz
1M
10M
0 100
0
1k
10k
100k 1M FREQUENCY Hz
10M
Figure 13. Maximum Output Swing vs. Frequency
Figure 14. Maximum Output Swing vs. Frequency
Figure 15. Closed-Loop Output Impedance vs. Frequency
140 120 100 80 60 40 20 0 100 POWER-SUPPLY REJECTION dB COMMON-MODE REJECTION dB 5V VS 18V TA = 25 C 40 5V VS 18V TA = 25 C
100 VS = 18V TA = 25 C 80
GAIN dB
20
60 PSRR+ 40 PSRR 20
0
1k
10k
100k 1M 10M FREQUENCY Hz
100M
1k
10k 100k FREQUENCY Hz
1M
10M
0 100
1k
10k 100k FREQUENCY Hz
1M
10M
Figure 16. Closed-Loop Gain vs. Frequency
Figure 17. Common-Mode Rejection vs. Frequency
Figure 18. Power-Supply Rejection vs. Frequency
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AD8614/AD8644
9 VOLTAGE NOISE DENSITY nV Hz 8 7 SLEW RATE V/ s 6 SR 5 4 3 2 1 0 0 AV = 1 RL = 2k CL = 200pF TA = 25 C 2 4 6 8 10 12 14 16 18 SUPPLY VOLTAGE V 20 SR+ 100 VOLTAGE NOISE DENSITY nV Hz VS = 5V TA = 25 C 100 VS = 18V TA = 25 C
10
10
1
10
100 1k FREQUENCY Hz
10k
1
10
100 1k FREQUENCY Hz
10k
Figure 19. Slew Rate vs. Supply Voltage
Figure 20. Voltage Noise Density vs. Frequency
Figure 21. Voltage Noise Density vs. Frequency
APPLICATIONS SECTION Theory of Operation
The AD8614/AD8644 are processed using Analog Devices' high voltage, high speed, complementary bipolar process--HV XFCB. This process includes trench isolated transistors that lower parasitic capacitance. Figure 22 shows a simplified schematic of the AD8614/AD8644. The input stage is rail-to-rail, consisting of two complementary differential pairs, one NPN pair and one PNP pair. The input stage is protected against avalanche breakdown by two back-to-back diodes. Each input has a 1.5 k resistor that limits input current during over-voltage events and furnishes phase reversal protection if the inputs are exceeded. The two differential pairs are connected to a double-folded cascode. This is the stage in the amplifier with the most gain. The double folded cascode differentially feeds the output stage circuitry. Two complementary common emitter transistors are used as the output stage. This allows the output to swing to within 125 mV from each rail with a 10 mA load. The gain of the output stage, and thus the open loop gain of the op amp, depends on the load resistance.
VCC
The AD8614/AD8644 have no built-in short circuit protection. The short circuit limit is a function of high current roll-off of the output stage transistors and the voltage drop over the resistor shown on the schematic at the output stage. The voltage over this resistor is clamped to one diode during short circuit voltage events.
Output Short-Circuit Protection
To achieve a wide bandwidth and high slew rate, the output of the AD8614/AD8644 is not short-circuit protected. Shorting the output directly to ground or to a supply rail may destroy the device. The typical maximum safe output current is 70 mA. In applications where some output current protection is needed, but not at the expense of reduced output voltage headroom, a low value resistor in series with the output can be used. This is shown in Figure 23. The resistor is connected within the feedback loop of the amplifier so that if VOUT is shorted to ground and VIN swings up to 18 V, the output current will not exceed 70 mA. For 18 V single supply applications, resistors less than 261 are not recommended.
1V k .5
1.5k
+
V
CC
VCC
VOUT
EE
Figure 22. Simplified Schematic
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