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PDF AD8614 Data sheet ( Hoja de datos )
| Número de pieza | AD8614 | |
| Descripción | Single and Quad +18 V Operational Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8614 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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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
APPLICATIONS
LCD gamma and VCOM drivers
Modems
Portable instrumentation
Direct access arrangement
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.
Single and Quad 18 V
Operational Amplifiers
AD8614/AD8644
PIN CONFIGURATIONS
OUT A 1
V– 2
+IN 3
AD8614
TOP VIEW
(Not to Scale)
5 V+
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
14 OUT D
AD8644
TOP VIEW
(Not to Scale)
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 OUT C
Figure 2. 14-Lead TSSOP
(RU-14)
OUT A 1
14 OUT D
–IN A 2
13 –IN D
+IN A 3 AD8644 12 +IN D
V+
4
TOP VIEW
(Not to Scale)
11 V–
+IN B 5
10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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.
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
50
VS = 18V
45 RL = 2kΩ
TA = 25°C
40
35
30
25
20
15
+OS
10
–OS
5
0
10 100 1k
CAPACITANCE (pF)
Figure 4. Small Signal Overshoot vs. Load Capacitance
10k
12
8
0.1%
4
0.01%
0
–4
0.1%
0.01%
–8
–12
0
0.5 1.0 1.5 2.0 2.5 3.0
SETTLING TIME (µs)
Figure 5. Output Swing vs. Settling Time
3.5
80
60
40
5V ≤ VS ≤ 18V
20 RL = 1MΩ
CL = 40pF
0 TA = 25°C
45
90
135
180
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 6. Open-Loop Gain and Phase Shift vs. Frequency
AD8614/AD8644
7.5
VS = 5V
6.5 RL = 2kΩ
CL = 200pF
5.5 AV = 1
TA = 25°C
4.5
3.5
2.5
1.5
0.5
–0.5
–1.5
–2.5
TIME (1µs/DIV)
Figure 7. Large Signal Transient Response, VS = 5 V
29
VS = 18V
25 RL = 2kΩ
CL = 200pF
21 AV = 1
TA = 25°C
17
13
9
5
1
–3
–7
–11
TIME (1µs/DIV)
Figure 8. Large Signal Transient Response, VS = 18 V
VS
2
VS = 5V ≤ VS ≤ 18V
RL = 2kΩ
CL = 200pF
AV = 1
TA = 25°C
TIME (500ns/DIV)
Figure 9. Small Signal Transient Response
Rev. B | Page 5 of 16
5 Page 
CAPACITIVE LOAD DRIVE
The AD8614/AD8644 exhibit excellent capacitive load driving
capabilities. Although the device is stable with large capacitive
loads, there is a decrease in amplifier bandwidth as the
capacitive load increases.
When driving heavy capacitive loads directly from the
AD8614/AD8644 output, a snubber network can be used to
improve the transient response. This network consists of a
series R-C connected from the amplifier’s output to ground,
placing it in parallel with the capacitive load. The configuration
is shown in Figure 28. Although this network does not increase
the bandwidth of the amplifier, it does significantly reduce the
amount of overshoot.
5V
AD86x4
VIN
VOUT
RX CL
CX
Figure 28. Snubber Network Compensation for Capacitive Loads
The optimum values for the snubber network should be
determined empirically based on the size of the capacitive load.
Table 4 shows a few sample snubber network values for a given
load capacitance.
Table 4. Snubber Networks for Large Capacitive Loads
Load Capacitance (CL)
Snubber Network (RX, CX)
0.47 nF
300 Ω, 0.1 μF
4.7 nF
30 Ω, 1 μF
47 nF
5 Ω, 10 μF
DIRECT ACCESS ARRANGEMENT
Figure 29 shows a schematic for a 5 V single-supply transmit/
receive telephone line interface for 600 Ω transmission systems. It
allows full duplex transmission of signals on a transformer-
coupled 600 Ω line. Amplifier A1 provides gain that can be
adjusted to meet the modem’s output drive requirements. Both
A1 and A2 are configured to apply the largest possible differential
signal to the transformer. The largest signal available on a single
5 V supply is approximately 4.0 V p-p into a 600 Ω transmission
system. Amplifier A3 is configured as a difference amplifier to
extract the receive information from the transmission line for
amplification by A4. A3 also prevents the transmit signal from
interfering with the receive signal. The gain of A4 can be adjusted
in the same manner as A1 to meet the modem input signal
requirements. Standard resistor values permit the use of single
in-line package (SIP) format resistor arrays. Couple this with
the AD8644 14-lead SOIC or TSSOP package and this circuit
can offer a compact solution.
AD8614/AD8644
TO TELEPHONE
LINE
1:1
ZO
600Ω
6.2V
6.2V
T1
MIDCOM
671-8005
R3
360Ω
P1
Tx GAIN
ADJUST
R2
9.09kΩ
2kΩ
1
R5
10kΩ
A1
2
3
R1
10kΩ
C1
0.1µF
TRANSMIT
TxA
R6
10kΩ
7
6
A2 5
5V DC
10µF
R7
10kΩ
R8
10kΩ
R9
10kΩ
R10
10kΩ
R11
10kΩ
2
3 A3
A1, A2 = 1/2 AD8644
A3, A4 = 1/2 AD8644
R12
10kΩ
1
R13
10kΩ
R14
14.3kΩ
P2
Rx GAIN
ADJUST
RECEIVE
RxA
6 2kΩ C2
5 A4 7 0.1µF
Figure 29. A Single-Supply Direct Access Arrangement for Modems
A ONE-CHIP HEADPHONE/MICROPHONE
PREAMPLIFIER SOLUTION
Because of its high output current performance, the AD8644
makes an excellent amplifier for driving an audio output jack in
a computer application. Figure 30 shows how the AD8644 can
be interfaced with an ac codec to drive headphones or speakers.
5V
AVDD1 25
VREFOUT 28
LINE_OUT_L 35
AD1881A
(AC'97)
5V
2 10
U1-A
1
4
3
5
C1
100µF
+
R1
2kΩ
R3
20Ω
LINE_OUT_R 36
AVSS1 26
6
7
U1-B
8
9
C2
100µF
+
R2
2kΩ
R4
20Ω
U1 = AD8644
NOTES
1. ADDITIONAL PINS OMITTED FOR CLARITY.
Figure 30. A PC-99-Compliant Headphone/Line Out Amplifier
Rev. B | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD8614.PDF ] | |
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