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PDF AD8631 Data sheet ( Hoja de datos )
| Número de pieza | AD8631 | |
| Descripción | 1.8 V/ 5 MHz Rail-to-Rail Low Power Operational Amplifiers | |
| Fabricantes | Analog Devices | |
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a
1.8 V, 5 MHz Rail-to-Rail
Low Power Operational Amplifiers
AD8631/AD8632
FEATURES
Single Supply Operation: 1.8 V to 6 V
Space-Saving SOT-23, SOIC Packaging
Wide Bandwidth: 5 MHz @ 5 V, 4 MHz @ 1.8 V
Low Offset Voltage: 4 mV Max, 0.8 mV typ
Rail-to-Rail Input and Output Swing
2 V/s Slew Rate @ 1.8 V
Only 225 A Supply Current @ 1.8 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 AD8631 brings precision and bandwidth to the SOT-23-5
package at single supply voltages as low as 1.8 V and low supply
current. The small package makes it possible to place the AD8631
next to sensors, reducing external noise pickup.
The AD8631 and AD8632 are rail-to-rail input and output bipolar
amplifiers with a gain bandwidth of 4 MHz and typical voltage
offset of 0.8 mV from a 1.8 V supply. The low supply current and
the low supply voltage makes these parts ideal for battery-powered
applications. The 3 V/µs slew rate makes the AD8631/AD8632 a
good match for driving ASIC inputs, such as voice codecs.
The AD8631/AD8632 is specified over the extended industrial
(–40؇C to +125؇C) temperature range. The AD8631 single is
available in 5-lead SOT-23 surface-mount packages. The dual
AD8632 is available in 8-lead SOIC and µSOIC packages.
PIN CONFIGURATIONS
5-Lead SOT-23
(RT Suffix)
AD8631
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
AD8632
8 V+
7 OUT B
6 –IN B
5 +IN B
8-Lead SOIC
(RM Suffix)
OUT A
–IN A
+IN A
V–
18
AD8632
45
V+
OUT B
–IN B
+IN B
REV. 0
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
Storage Temperature Range
R, RM, and RT Packages . . . . . . . . . . . . . –65؇C to +150؇C
Operating Temperature Range
AD8631, AD8632 . . . . . . . . . . . . . . . . . . –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
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 condi-
tions for extended periods may affect device reliability.
2For supply voltages less than 6 V the input voltage is limited to the supply voltage.
AD8631/AD8632
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.
ORDERING GUIDE
Model
Temperature
Range
AD8631ART1 –40؇C to +125؇C
AD8632AR –40؇C to +125؇C
AD8632ARM2 –40؇C to +125؇C
NOTES
1Available in 3,000-piece reels only.
2Available in 2,500-piece reels only.
Package
Description
Package
Option Brand
5-Lead SOT-23 RT-5
8-Lead SOIC SO-8
8-Lead µSOIC RM-8
AEA
AGA
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 AD8631/AD8632 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 = 1,133 OP AMPS
90
60
30
0
–4 –3 –2 –1
0
1
2
3
4
INPUT OFFSET VOLTAGE – mV
Figure 1. Input Offset Voltage Distribution
350
TA = 25؇C
325
300
275
250
225
200
1
2 345
SUPPLY VOLTAGE – V
6
Figure 2. Supply Current per Amplifier vs. Supply Voltage
REV. 0
–5–
5 Page 
AD8631/AD8632
Table II. Snubber Network Values for Large Capacitive Loads
CLOAD
600 pF
1 nF
10 nF
Rx
300 Ω
300 Ω
90 Ω
Cx
1 nF
1 nF
8 nF
TOTAL HARMONIC DISTORTION + NOISE
The AD863x family offers a low total harmonic distortion, which
makes this amplifier ideal for audio applications. Figure 27 shows
a graph of THD + N, which is ~0.02% @ 1 kHz, for a 1.8 V supply.
At unity gain in an inverting configuration the value of the Total
Harmonic Distortion + Noise stays consistently low over all volt-
ages supply ranges.
10
INVERTING
AV = 1
1
0.1
VS = 1.8V
0.01
VS = 5V
0.001
10
100 1k
FREQUENCY – Hz
10k 20k
Figure 27. THD + N vs. Frequency Graph
AD8632 Turn-On Time
The low voltage, low power AD8632 features an extraordinary turn
on time. This is about 500 ns for VSY = 5 V, which is impressive
considering the low supply current (300 µA typical per amplifier).
Figure 28 shows a scope picture of the AD8632 with both channels
configured as followers. Channel A has an input signal of 2.5 V and
channel B has the input signal at ground. The top waveform shows
the supply voltage and the bottom waveform reflects the response
of the amplifier at the output of Channel A.
0
VS = 5V
0 AV = 1
VIN = 2.5V STEP
0V0
0
0
0V
0
0
TIME – 200ns/DIV
Figure 28. AD8632 Turn-On Time
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 28 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 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⍀
AD8631
1F
100⍀
1F
VREF
0.9V TO 2.5V
Figure 29. A Micropower Reference Voltage Generator
MICROPHONE PREAMPLIFIER
The AD8631 is ideal to use as a microphone preamplifier.
Figure 30 shows this implementation.
1.8V
R1
2.2k⍀
VIN
C1 R2
0.1F 22k⍀
ELECTRET
MIC
R3
220k⍀
1.8V
AD8631
VREF = 0.9V
AV
= R3
R2
VOUT
Figure 30. 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 ϫ R1. VREF should be equal to
1/2 ϫ 1.8 V for maximum voltage swing.
Direct Access Arrangement for Telephone Line Interface
Figure 31 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 adjusted 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 AD8631/
REV. 0
–11–
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet AD8631.PDF ] | |
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