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PDF AD8517 Data sheet ( Hoja de datos )
| Número de pieza | AD8517 | |
| Descripción | 7 MHz Rail-to-Rail Low Voltage Operational Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
7 MHz Rail-to-Rail
Low Voltage Operational Amplifiers
AD8517/AD8527
FEATURES
Single Supply Operation: 1.8 V to 6 V
Space-Saving SOT-23, SOIC Packaging
Wide Bandwidth: 7 MHz @ 5 V
Low Offset Voltage: 3.5 mV Max
Rail-to-Rail Output Swing and Rail-to-Rail Input
8 V/s Slew Rate
Only 900 A Supply Current @ 5 V
APPLICATIONS
Portable Communications
Portable Phones
Sensor Interface
Active Filters
PCMCIA Cards
ASIC Input Drivers
Wearable Computers
Battery-Powered Devices
New Generation Phones
Personal Digital Assistants
GENERAL DESCRIPTION
The AD8517 brings precision and bandwidth to the SOT-23-5
package even at single supply voltages as low as 1.8 V. The
small package makes it possible to place the AD8517 next to
sensors, reducing external noise pickup. The AD8527 dual
amplifier is offered in the space-saving MSOP package.
The AD8517 and AD8527 are rail-to-rail input and output
bipolar amplifiers with a gain bandwidth of 7 MHz and typical
voltage offset of 1.3 mV from a 1.8 V supply. The low supply
current makes these parts ideal for battery-powered applications.
The 8 V/µs slew rate makes the AD8517/AD8527 a good match
for driving ASIC inputs, such as voice codecs.
The AD8517/AD8527 is specified over the extended industrial
(–40°C to +125°C) temperature range. The AD8517 single is
available in 5-lead SOT-23 surface-mount packages. The dual
AD8527 is available in 8-lead SOIC and MSOP packages.
PIN CONFIGURATIONS
5-Lead SOT-23
(RT Suffix)
AD8517
OUT A 1
5 V+
V– 2
+IN A 3
4 –IN A
8-Lead SOIC
(R Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
AD8527
8 V+
7 OUT B
6 –IN B
5 +IN B
8-Lead MSOP
(RM Suffix)
OUT A
–IN A
+IN A
V–
18
AD8527
45
V+
OUT B
–IN B
+IN B
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
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., 2000
1 page  
ABSOLUTE MAXIMUM RATINGS1
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . GND to VS
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . ± 0.6 V
Internal Power Dissipation
SOT-23 (RT) . . . . . . . . . . . . See Thermal Resistance Chart
SOIC (R) . . . . . . . . . . . . . . . See Thermal Resistance Chart
µSOIC (RM) . . . . . . . . . . . . See Thermal Resistance Chart
Output Short-Circuit Duration
. . . . . . . . . . . . . . . . . . . . . . . . Indefinite for TA < +40°C
Storage Temperature Range
R, RM and RT Packages . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
AD8517, AD8527 . . . . . . . . . . . . . . . . . . –40°C to +125°C
Junction Temperature Range
R, RM and RT Packages . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . 300°C
AD8517/AD8527
NOTES
1Stresses 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.
2For supply voltages less than 6 V the input voltage is limited to less than or equal
to the supply voltage.
Package Type
5-Lead SOT-23 (RT)
8-Lead SOIC (R)
8-Lead µSOIC (RM)
JA1 JC Unit
230 146 °C/W
158 43 °C/W
210 45 °C/W
NOTE
1θJA is specified for worst-case conditions, i.e., θJA is specified for device soldered
in circuit board for SOT-23 and SOIC packages.
Model
AD8517ART-REEL
AD8527AR
AD8527ARM-REEL
ORDERING GUIDE
Temperature
Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
Description
5-Lead SOT-23
8-Lead SOIC
8-Lead µSOIC
Package
Option
RT-5
SO-8
RM-8
Branding
Information
ADA
AFA
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 AD8517/AD8527 features proprietary ESD protection circuitry, permanent dam-
age 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
120
VS = 5V
VCM = 2.5V
TA = 25؇C
COUNT = 935 OP AMPS
90
60
30
0
؊4 ؊3 ؊2 ؊1
0
1
23
4
INPUT OFFSET VOLTAGE – mV
Figure 1. Input Offset Voltage Distribution
950
900
850
800
750
700
650
600
1
2 34 5
SUPPLY VOLTAGE – V
6
Figure 2. Supply Current per Amplifier vs. Supply Voltage
REV. B
–5–
5 Page 
AD8517/AD8527
Table III. Snubber Network Values for Large Capacitive Loads
CLOAD
680 pF
1 nF
10 nF
Rx
300 Ω
100 Ω
400 Ω
Cx
3 nF
10 nF
30 nF
TOTAL HARMONIC DISTORTION + NOISE
The AD85x7 family offers a low total harmonic distortion, which
makes this amplifier ideal for audio applications. Figure 26 shows a
graph of THD + N, for a VS > 3 V the THD + N is about 0.001%
and 0.03% for VS ≥ 1.8 V in a noninverting configuration with a
gain of 1. In an inverting configuration, the noise is 0.003% for
all VSY.
1
AV = +2
0.1
VS = 1.8V
0.01
VS > 3V TO 5V
0.001
0.0001
10
100 1k
FREQUENCY – Hz
10k 20k
Figure 26. THD + N vs. Frequency Graph
A MICROPOWER REFERENCE VOLTAGE GENERATOR
Many single supply circuits are configured with the circuit-biased
to one-half of the supply voltage. In these cases, a false-ground
reference can be created by using a voltage divider buffered by an
amplifier. Figure 27 shows the schematic for such a circuit.
The two 1 MΩ resistors generate the reference voltages while
drawing only 0.9 µA of current from a 1.8 V supply. A capacitor
connected from the inverting terminal to the output of the op
amp provides compensation to allow for a bypass capacitor to be
connected at the reference output. This bypass capacitor helps
establish an ac ground for the reference output.
1.8V TO 5V
10k⍀
0.022F
1M⍀
1M⍀
AD8517
1F
100⍀
VREF
1F 0.9V TO 2.5V
Figure 27. A Micropower Reference Voltage Generator
MICROPHONE PREAMPLIFIER
The AD8517 is ideal to use as a microphone preamplifier.
Figure 28 shows this implementation.
VCC
R1
2.2k⍀
VIN
ELECTRET
MIC
C1
0.1F
R2
22k⍀
VREF
R3
220k⍀
VCC
AD8517
VOUT
| AV |
=
R3
R2
Figure 28. A Microphone Preamplifier
R1 is used to bias an electret microphone and C1 blocks dc
voltage from the amplifier. The magnitude of the gain of the
amplifier is approximately R3/R2 when R2 ≥ 10 × R1. VREF
should be equal to 1/2 1.8 V for maximum voltage swing.
Direct Access Arrangement for Telephone Line Interface
Figure 28 illustrates a 1.8 V transmit/receive telephone line
interface for 600 Ω transmission systems. It allows full duplex
transmission of signals on a transformer-coupled 600 Ω line in a
differential manner. Amplifier A1 provides gain that can be ad-
justed to meet the modem output drive requirements. Both A1
and A2 are configured to apply the largest possible signal on a
single supply to the transformer. Amplifier A3 is configured as a
difference amplifier for two reasons: (1) It prevents the transmit
signal from interfering with the receive signal and (2) it extracts
the receive signal from the transmission line for amplification by
A4. A4’s gain can be adjusted in the same manner as A1’s to
meet the modem’s input signal requirements. Standard resistor
values permit the use of SIP (Single In-line Package) format
resistor arrays. Couple this with the AD8517/AD8527’s 5-lead
SOT-23, 8-lead MSOP, and 8-lead SOIC footprint and this
circuit offers a compact solution.
TO
TELEPHONE
LINE 1:1
ZO
600⍀
T1
MIDCOM
671-8005
P1
Tx GAIN
ADJUST R2
9.09k⍀
6.2V
R3
360⍀
2k⍀
1 A1
1/2
AD8517
2
3
6.2V
R5 R6
10k⍀ 10k⍀
R9
10k⍀
7
A2
1/2
AD8517
6
5
R1
10k⍀
C1
0.1F
+1.8V DC
R7
10k⍀
10F
R8
10k⍀
R10
10k⍀
R11
10k⍀
2
3 A3 1
R12
10k⍀
1/2
AD8527
P2
Rx GAIN
R13 R14 ADJUST
10k⍀ 14.3k⍀
6 2k⍀
7
5 A4
1/2
C2
0.1F
AD8527
TRANSMIT
TxA
RECEIVE
RxA
Figure 29. A Single-Supply Direct Access Arrangement
for Modems
REV. B
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD8517.PDF ] | |
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