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Teilenummer | AD8632 |
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Beschreibung | 1.8 V/ 5 MHz Rail-to-Rail Low Power Operational Amplifiers | |
Hersteller | Analog Devices | |
Logo | ||
Gesamt 12 Seiten www.DataSheet4U.com
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
AD8631/AD8632 – Typical Characteristics
500
VS = 5V
450
400
350
300
250
200
؊50
؊25
0
25 50
75
TEMPERATURE – ؇C
100 125
Figure 3. Supply Current per Amplifier vs. Temperature
150
VS = ؎2.5V
TA = 25؇C
100
50
0
؊50
؊100
؊150
؊3
؊2 ؊1
0
1
COMMON-MODE VOLTAGE – V
2
3
Figure 4. Input Bias Current vs. Common-Mode Voltage
140
TA = 25؇C
120
100
80
60
40
SOURCE
20
0
10 100
1k 10k
LOAD CURRENT – A
Figure 5. Output Voltage to Supply Rail vs. Load Current
40
30
20
10
0
؊10
؊20
GAIN
VS = 5V
TA = 25؇C
PHASE
90
45
0
؊45
؊90
؊30
؊40
100k
1M 10M
FREQUENCY – Hz
100M
Figure 6. Open-Loop Gain vs. Frequency
50
40
VS = ±2.5V
TA = 25؇C
30
20
10
0
؊10
؊20
؊30
؊40
10
100 1k 10k 100k 1M 10M 100M
FREQUENCY – Hz
Figure 7. Closed-Loop Gain vs. Frequency
0
VS = ؎2.5V
TA = 25؇C
20
40
60
80
100
10
100 1k 10k 100k 1M
FREQUENCY – Hz
Figure 8. CMRR vs. Frequency
10M
–6– REV. 0
6 Page AD8631/AD8632
AD8632’s 5-lead SOT-23, 8-lead µSOIC, and 8-lead SOIC
footprint and this circuit offers a compact solution.
TO TELEPHONE
LINE
1:1
ZO
600⍀
6.2V
6.2V
T1
MIDCOM
671-8005
R3
360⍀
P1
Tx GAIN
ADJUST
R2
9.09k⍀
2k⍀
1
R5
10k⍀
A1
2
3
R1 C1
10k⍀ 0.1F
TRANSMIT
TxA
R6
10k⍀
7
6
A2 5
+1.8V DC
R7
10k⍀
10F
R8
10k⍀
R9
10k⍀
R10
10k⍀
R11
10k⍀
A1, A2 = 1/2 AD8632
A3, A4 = 1/2 AD8632
R12
10k⍀
2
3 A3
1
R13 R14
10k⍀ 14.3k⍀
P2
Rx GAIN
ADJUST
RECEIVE
RxA
6 2k⍀ C2
5 A4 7 0.1F
Figure 31. A Single-Supply Direct Access Arrangement
for Modems
SPICE Model
The SPICE model for the AD8631 amplifier is available and
can be downloaded from the Analog Devices’ web site at
http://www.analog.com. The macro-model accurately simulates
a number of AD8631 parameters, including offset voltage, input
common-mode range, and rail-to-rail output swing. The output
voltage versus output current characteristics of the macro-model
is identical to the actual AD8631 performance, which is a critical
feature with a rail-to-rail amplifier model. The model also accurately
simulates many ac effects, such as gain-bandwidth product, phase
margin, input voltage noise, CMRR and PSRR versus frequency,
and transient response. Its high degree of model accuracy makes the
AD8631 macro-model one of the most reliable and true-to-life
models available for any amplifier.
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Lead Narrow Body SOIC
(SO-8)
8-Lead SOIC
(RM-8)
0.1968 (5.00)
0.1890 (4.80)
0.122 (3.10)
0.114 (2.90)
8
0.1574 (4.00)
0.1497 (3.80) 1
5
0.2440 (6.20)
4 0.2284 (5.80)
PIN 1
0.0098 (0.25)
0.0040 (0.10)
0.0688 (1.75)
0.0532 (1.35)
SEATING
PLANE
0.0500 0.0192 (0.49)
(1.27) 0.0138 (0.35)
BSC
0.0098 (0.25)
0.0075 (0.19)
0.0196 (0.50)
0.0099 (0.25)؋ 45؇
8؇
0؇ 0.0500 (1.27)
0.0160 (0.41)
8
0.122 (3.10)
0.114 (2.90)
1
5
0.199 (5.05)
0.187 (4.75)
4
PIN 1
0.0256 (0.65) BSC
0.120 (3.05)
0.120 (3.05)
0.112 (2.84)
0.112 (2.84)
0.006 (0.15)
0.002 (0.05)
SEATING
PLANE
0.043 (1.09)
0.037 (0.94)
33؇
0.018 (0.46)
0.008 (0.20)
0.011 (0.28) 27؇
0.003 (0.08)
0.028 (0.71)
0.016 (0.41)
5-Lead SOT-23
(RT-5)
0.1181 (3.00)
0.1102 (2.80)
0.0669 (1.70)
0.0590 (1.50)
PIN 1
0.0512 (1.30)
0.0354 (0.90)
5 4 0.1181 (3.00)
0.1024 (2.60)
123
0.0374 (0.95) BSC
0.0748 (1.90)
BSC
0.0571 (1.45)
0.0374 (0.95)
0.0059 (0.15)
0.0019 (0.05)
0.0197 (0.50)
0.0138 (0.35)
SEATING
PLANE
–12–
0.0079 (0.20)
0.0031 (0.08)
10؇
0؇ 0.0217 (0.55)
0.0138 (0.35)
REV. 0
12 Page | ||
Seiten | Gesamt 12 Seiten | |
PDF Download | [ AD8632 Schematic.PDF ] |
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