AD8646 [ADI]
24 MHz Rail-to-Rail Dual Amplifier; 24 MHz轨到轨双通道放大器
| 型号： | AD8646 |
| 厂家： | 
ADI |
| 描述： | 24 MHz Rail-to-Rail Dual Amplifier |
| 文件： | 总12页 (文件大小：472K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
24 MHz Rail-to-Rail
Dual Amplifier
AD8646
FEATURES
PIN CONFIGURATION
Offset voltage: 2.5 mV maximum
Single-supply operation: 2.7 V to 5.5 V
Low noise: 8 nV/√Hz
Wide bandwidth: 24 MHz
Slew rate: 12 V/μs
OUTA
–INA
+INA
V–
1
2
3
4
8
7
6
5
V+
OUTB
–INB
+INB
AD8646
TOP VIEW
(Not to Scale)
Figure 1.
Short-circuit output current: 150 mA
No phase reversal
Low input bias current: 1 pA
Low supply current: 2 mA maximum
Unity gain stable
APPLICATIONS
Battery-powered instruments
Multipole filters
ADC front ends
Sensors
Barcode scanners
ASIC input or output amplifiers
Audio amplifiers
Photodiode amplifiers
Datapath/mux/switch control
GENERAL DESCRIPTION
The AD8646 is a dual, rail-to-rail, input and output, single-
supply amplifier featuring low offset voltage, wide signal
bandwidth, low input voltage, and low current noise.
offers high output drive capability, which is excellent for audio
line drivers and other low impedance applications.
Applications include portable and low powered instrumenta-
tion, audio amplification for portable devices, portable phone
headsets, barcode scanners, and multipole filters. The ability to
swing rail to rail at both the input and output enables designers
to buffer CMOS ADCs, DACs, ASICs, and other wide output
swing devices in single-supply systems.
The combination of 24 MHz bandwidth, low offset, low noise,
and very low input bias current makes these amplifiers useful in
a wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. AC applications benefit
from the wide bandwidth and low distortion. This amplifier
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 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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2007 Analog Devices, Inc. All rights reserved.
AD8646
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................5
Thermal Resistance.......................................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions....................................................................... 12
Ordering Guide .......................................................................... 12
Applications....................................................................................... 1
Pin Configuration............................................................................. 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
REVISION HISTORY
8/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 12
AD8646
SPECIFICATIONS
VDD = 5 V, VCM = VDD/2, TA = +25oC, unless otherwise noted.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VCM = 2.5 V
−40°C < TA < +125°C
−40°C < TA < +125°C
0.6
2.5
3.2
7.5
1
50
550
0.5
50
250
5
mV
mV
μV/°C
pA
pA
pA
pA
pA
pA
V
Offset Voltage Drift
Input Bias Current
ΔVOS/ΔT
IB
1.8
0.3
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Offset Current
IOS
0.1
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Voltage Range
VCM
0
Common-Mode Rejection Ratio
Large Signal Voltage Gain
OUTPUT CHARACTERISTICS
Output Voltage High
CMRR
AVO
VCM = 0 V to 5 V
RL = 2 kΩ, VO = 0.5 V to 4.5 V
67
104
84
116
dB
dB
VOH
IOUT = 1 mA
4.98
4.90
4.85
4.70
4.99
4.92
8.4
V
−40°C < TA < +125°C
IOUT = 10 mA
−40°C < TA < +125°C
IOUT = 1 mA
−40°C < TA < +125°C
IOUT = 10 mA
−40°C < TA < +125°C
Short circuit
V
V
Output Voltage Low
VOL
20
40
145
200
mV
mV
mV
mV
mA
Ω
78
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
IOUT
ZOUT
120
At 1 MHz, AV = 1
5
Power Supply Rejection Ratio
Supply Current per Amplifier
PSRR
ISY
VDD = 2.7 V to 5.0 V
−40°C < TA < +125°C
RL = 2 kΩ
63
80
1.5
dB
mA
2.25 mA
1.9
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
SR
GBP
Øm
11
27
77
V/μs
MHz
Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 10 kHz
f = 100 kHz
2.3
8
6
−129
−119
μV
nV/√Hz
nV/√Hz
dB
Channel Separation
CS
dB
Total Harmonic Distortion Plus Noise
THD+N
V p-p = 0.1 V, RL = 600 Ω, f = 25 kHz,
TA = 25°C
AV = +1
AV = −10
0.010
0.021
%
%
Rev. 0 | Page 3 of 12
AD8646
VDD = 2.7 V, VCM = VDD/2, TA = +25oC, unless otherwise noted.
Table 2.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT CHARACTERISTICS
Offset Voltage
VOS
VCM = 1.35 V
−40°C < TA < +125°C
−40°C < TA < +125°C
0.6
2.5
3.2
7.0
1
mV
mV
μV/°C
pA
pA
pA
pA
pA
pA
V
Offset Voltage Drift
Input Bias Current
ΔVOS/ΔT
IB
1.5
0.2
−40°C < TA < +85°C
−40°C < TA < +125°C
50
550
0.5
50
250
2.7
Input Offset Current
IOS
0.1
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Voltage Range
VCM
0
Common-Mode Rejection Ratio
Large Signal Voltage Gain
OUTPUT CHARACTERISTICS
Output Voltage High
CMRR
AVO
VCM = 0 V to 2.7 V
RL = 2 kΩ, VO = 0.5 V to 2.2 V
62
95
79
107
dB
dB
VOH
VOL
IOUT = 1 mA
−40°C < TA < +125°C
IOUT = 1 mA
−40°C < TA < +125°C
Short circuit
At 1 MHz, AV = 1
2.65
2.60
2.68
11
V
V
mV
mV
mA
Ω
Output Voltage Low
25
30
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
IOUT
ZOUT
63
5
Power Supply Rejection Ratio
Supply Current per Amplifier
PSRR
ISY
VDD = 2.7 V to 5.0 V
63
80
1.6
dB
mA
mA
1.9
2.25
−40°C < TA < +125°C
DYNAMIC PERFORMANCE
Slew Rate
SR
RL = 2 kΩ
11
V/μs
RL = 10 kΩ
Gain Bandwidth Product
Phase Margin
GBP
Øm
26
53
MHz
Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
en p-p
en
0.1 Hz to 10 Hz
f = 1 kHz
f = 10 kHz
f = 10 kHz
f = 100 kHz
2.3
8
6
−129
−121
μV
nV/√Hz
nV/√Hz
dB
Channel Separation
CS
dB
Rev. 0 | Page 4 of 12
AD8646
ABSOLUTE MAXIMUM RATINGS
Table 3.
THERMAL RESISTANCE
Parameter
Rating
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Supply Voltage
6 V
Input Voltage
GND to VDD
3 V
Indefinite
−65°C to +150°C
−40°C to +125°C
300°C
Table 4. Thermal Resistance
Differential Input Voltage
Output Short Circuit to GND
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering 60 sec)
Junction Temperature
Package Type
8-Lead SOIC
8-Lead MSOP
θJA
θJC
43
45
Unit
°C/W
°C/W
121
210
150°C
ESD CAUTION
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 indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. 0 | Page 5 of 12
AD8646
TYPICAL PERFORMANCE CHARACTERISTICS
300
200
180
160
140
120
100
80
V
V
= 2.7V
V
V
= 5V
= 2.5V
SY
SY
= 1.35V
CM
CM
T
= 25°C
T = 25°C
A
A
250
200
150
100
50
2244 AMPLIFIERS
2244 AMPLIFIERS
60
40
20
0
0
–2.0
–1.5
–1.0
–0.5
0
0.5
(mV)
1.0
1.5
2.0
–2.0
–1.5
–1.0
–0.5
0
0.5
(mV)
1.0
1.5
2.0
V
V
OS
OS
Figure 2. Input Offset Voltage Distribution
Figure 5. Input Offset Voltage Distribution
35
30
25
20
15
10
5
35
30
25
20
15
10
5
V
= 2.7V
V
= 5V
SY
SY
–40°C < T < +125°C
–40°C < T < +125°C
A
A
0
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
8
TCV (µV/°C)
OS
TCV (µV/°C)
OS
Figure 3. VOS Drift (TCVOS) Distribution
Figure 6. VOS Drift (TCVOS) Distribution
800
1000
800
V
= 2.7V
= 25°C
V
T
= 5V
SY
SY
= 25°C
T
A
A
600
400
600
400
200
200
0
0
–200
–400
–600
–800
–1000
–200
–400
–600
–800
0
0.3
0.6
0.9
1.2
1.5
(V)
1.8
2.1
2.4
2.7
0
1
2
3
4
5
V
V
(V)
CM
CM
Figure 4. Input Offset Voltage vs. Input Common-Mode Voltage
Figure 7. Input Offset Voltage vs. Input Common-Mode Voltage
Rev. 0 | Page 6 of 12
AD8646
10000
1000
100
10
10000
1000
100
10
V
= 2.7V
V
= 5V
SY
= 25°C
SY
T = 25°C
A
T
A
V
– V
OH
DD
V
OL
V
– V
OH
DD
1
1
V
OL
0.1
0.1
0.001
0.01
0.1
1
10
100
0.001
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
Figure 8. Output Saturation Voltage vs. Load Current
Figure 11. Output Saturation Voltage vs. Load Current
25
20
15
10
5
120
100
80
60
40
20
0
V
= 2.7V
V
= 5V
SY
SY
= 1mA
I
L
V
– V = 10mA
OH
SY
V
– V
OH
DD
V
= 10mA
OL
V
OL
V
– V = 1mA
OH
SY
V
= 1mA
65
OL
0
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
80
95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 9. Output Saturation Voltage vs. Temperature
Figure 12. Output Saturation Voltage vs. Temperature
300
250
200
150
100
50
300
250
200
150
100
50
V
= 2.7V
V
= 5V
SY
= 125°C
SY
T = 125°C
A
T
A
0
0
0.50
0.75
1.00
1.25
1.50
1.75
2.00
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
COMMON-MODE VOLTAGE (V)
INPUT COMMON-MODE VOLTAGE (V)
Figure 10. Input Bias Current vs. Common-Mode Voltage
Figure 13. Input Bias Current vs. Common-Mode Voltage
Rev. 0 | Page 7 of 12
AD8646
80
180
135
90
80
60
180
135
90
V
R
C
= 2.7V
= 1kΩ
= 10pF
= 25°C
V
R
C
= 5V
SY
SY
= 1kΩ
= 10pF
= 25°C
L
L
L
L
60
T
T
A
A
40
40
20
45
20
45
0
0
0
0
–20
–40
–45
–90
–135
–20
–40
–60
–45
–90
–135
–60
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
FREQUENCY (kHz)
FREQUENCY (kHz)
Figure 14. Open-Loop Gain and Phase vs. Frequency
Figure 17. Open-Loop Gain and Phase vs. Frequency
60
40
60
40
20
0
V
= 2.7V
V
= 5V
SY
= 25°C
SY
T = 25°C
A
T
A
A
A
= 100
= 10
A
A
= 100
= 10
V
V
V
V
20
A
= 1
A
= 1
V
V
0
–20
–40
–60
–20
–40
–60
1k
10k
100k
1M
10M
100M
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 15. Closed-Loop Gain vs. Frequency
Figure 18. Closed-Loop Gain vs. Frequency
250
200
150
100
50
120
100
80
60
40
20
0
V
= 2.7V
= 25°C
V
= 5V
SY
SY
T
T = 25°C
A
A
A
= 1
V
A
= 1
V
A
= 10
V
A
= 100
V
A
= 10
V
A
= 100
V
0
1
10
100
1k
10k
100k
1M
1
10
100
1k
10k
100k
1M
FREQUENCY (kHz)
FREQUENCY (kHz)
Figure 16. ZOUT vs. Frequency
Figure 19. ZOUT vs. Frequency
Rev. 0 | Page 8 of 12
AD8646
100
80
60
40
20
0
100
80
60
40
20
0
V
= 2.7V
V
= 5V
= 25°C
SY
= 25°C
SY
T
T
A
A
1k
10k
100k
1M
10M
100M
100M
1000
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 20. CMRR vs. Frequency
Figure 23. CMRR vs. Frequency
100
90
80
70
60
50
40
30
20
10
0
100
80
60
40
20
0
V
T
= 2.7V
V
= 5V
SY
SY
= 25°C
T = 25°C
A
A
–PSRR
+PSRR
+PSRR
–PSRR
–10
–20
1k
10k
100k
1M
10M
1
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (kHz)
Figure 21. PSRR vs. Frequency
Figure 24. PSRR vs. Frequency
60
50
40
30
20
10
0
60
50
40
30
20
10
0
V
T
= ±1.35V
V
= ±2.5V
SY
= 25°C
SY
T = 25°C
A
A
–OVERSHOOT
+OVERSHOOT
+OVERSHOOT
–OVERSHOOT
1
10
100
1
10
100
1000
C
(pF)
C
(pF)
LOAD
LOAD
Figure 22. Small Signal Overshoot vs. Load Capacitance
Figure 25. Small Signal Overshoot vs. Load Capacitance
Rev. 0 | Page 9 of 12
AD8646
V
= 2.7V, V
CM
= 1.35V, V = 100mV p-p,
IN
V
= 5V, V
CM
= 2.5V, V = 100mV p-p,
IN
SY
= 25°C, R = 10kΩ, C = 100pF
SY
T = 25°C, R = 10kΩ, C = 100pF
A
T
A
L
L
L
L
(200ns/DIV)
(200ns/DIV)
Figure 26. 2.7 V Small Signal Transient Response
Figure 29. 5 V Small Signal Transient Response
V
T
= 2.7V, V = 2V p-p,
IN
V
T
= 5V, V = 4V p-p,
IN
SY
SY
= 25°C, R = 10kΩ, C = 100pF
= 25°C, R = 10kΩ, C = 100pF
A
L
L
A
L
L
(200ns/DIV)
(200ns/DIV)
Figure 27. 2.7 V Large Signal Transient Response
Figure 30. 5 V Large Signal Transient Response
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
V
= ±2.5V
= 600Ω
= –10
V
= ±2.5V
= 600Ω
= 1
SY
SY
R
A
T
R
A
T
L
V
L
V
= 25°C
= 25°C
A
A
10
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 31. THD + Noise vs. Frequency
Figure 28. THD + Noise vs. Frequency
Rev. 0 | Page 10 of 12
AD8646
20
18
16
14
12
10
8
1000
100
10
V
T
= 5V
V = 5V
DD
SY
= 25°C
A
6
1
4
2
0
0.1
100
1k
10k
FREQUENCY (Hz)
100k
25
45
65
80
105
125
TEMPERATURE (°C)
Figure 32. Voltage Noise Density vs. Frequency
Figure 35. Input Bias Current vs. Temperature
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4000
3500
3000
2500
2000
1500
1000
500
V
V
A
R
= 5V
= 4.9V
= 1
= 10kΩ
= 25°C
T
= 25°C
SY
IN
A
BOTH AMPS
V
L
T
A
0
100
1k
10k
0
0.5
1.0
1.5
2.0
2.5
(V)
3.0
3.5
4.0
4.5
5.0
FREQUENCY (kHz)
V
SY
Figure 33. Maximum Output Swing vs. Frequency
Figure 36. Supply Current vs. Supply Voltage
0
–20
V
R
A
= 5V
V
T
= 2.7V TO 5V
2.3µV p-p
SY
SY
= 25°C
= 2kΩ
= –100
= 25°C
L
V
A
A
T
–40
–60
–80
V
= 2V p-p
IN
–100
–120
V
= 0.5V p-p
IN
M4.00s
A
CH1
0.00V
1k
10k
100k
FREQUENCY (Hz)
Figure 34. 0.1 Hz to 10 Hz Voltage Noise
Figure 37. Channel Separation
Rev. 0 | Page 11 of 12
AD8646
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
8
1
5
4
6.20 (0.2441)
5.80 (0.2284)
4.00 (0.1574)
3.80 (0.1497)
0.50 (0.0196)
0.25 (0.0099)
1.27 (0.0500)
BSC
45°
1.75 (0.0688)
1.35 (0.0532)
0.25 (0.0098)
0.10 (0.0040)
8°
0°
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 38. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
3.20
3.00
2.80
8
1
5
4
5.15
4.90
4.65
3.20
3.00
2.80
PIN 1
0.65 BSC
0.95
0.85
0.75
1.10 MAX
0.80
0.60
0.40
8°
0°
0.15
0.00
0.38
0.22
0.23
0.08
SEATING
PLANE
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 39. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model
AD8646ARZ1
AD8646ARZ-REEL1
AD8646ARZ-REEL71
AD8646ARMZ-R21
AD8646ARMZ-REEL1
Temperature Range
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead MSOP
Package Option
Branding
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
R-8
R-8
R-8
RM-8
RM-8
A1V
A1V
8-Lead MSOP
1 Z = RoHS Compliant Part.
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
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D06527-0-8/07(0)
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