ADA4850-2YCP-EBZ [ADI]
High Speed, Rail-to-Rail Output Op Amps with Ultralow Power-Down;
| 型号： | ADA4850-2YCP-EBZ |
| 厂家： | 
ADI |
| 描述： | High Speed, Rail-to-Rail Output Op Amps with Ultralow Power-Down |
| 文件： | 总14页 (文件大小：365K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
High Speed, Rail-to-Rail Output
Op Amps with Ultralow Power-Down
Data Sheet
ADA4850-1/ADA4850-2
FEATURES
PIN CONFIGURATIONS
ADA4850-1
Ultralow power-down current: 150 nA/amplifier maximum
Low quiescent current: 2.4 mA/amplifier
High speed
175 MHz, −3 dB bandwidth
220 V/μs slew rate
TOP VIEW
POWER DOWN
+V
S
1
2
3
4
8
7
6
5
NIC
–IN
+IN
OUTPUT
NIC
–V
S
85 ns settling time to 0.1%
Excellent video specifications
0.1 dB flatness: 14 MHz
NOTES
1. EXPOSED PAD CAN BE CONNECTED TO GND,
OR LEFT FLOATING.
2. NIC = NO INTERNAL CONNECTION.
Differential gain: 0.12%
Differential phase: 0.09°
Single-supply operation: 2.7 V to 6 V
Rail-to-rail output
Figure 1. 8-Lead, 3 mm × 3 mm LFCSP
ADA4850-2
TOP VIEW
Output swings to within 80 mV of either rail
Low voltage offset: 0.6 mV
V
1
1
2
3
4
12 +V
OUT
S
APPLICATIONS
–IN1
+IN1
11
10
9
V
2
OUT
Portable multimedia players
Video cameras
Digital still cameras
Consumer video
–IN2
+IN2
–V
S
Clock buffers
NOTES
1. EXPOSED PAD CAN BE CONNECTED TO GND,
OR LEFT FLOATING.
2. NIC = NO INTERNAL CONNECTION.
Figure 2. 16-Lead, 3 mm × 3 mm LFCSP
GENERAL DESCRIPTION
The ADA4850-1/ADA4850-2 are low price, high speed, voltage
feedbacks rail-to-rail output op amps with ultralow power-down.
Despite their low price, the ADA4850-1/ADA4850-2 provide
excellent overall performance and versatility. The 175 MHz,
−3 dB bandwidth and 220 V/μs slew rate make these amplifiers
well-suited for many general-purpose, high speed applications.
The ADA4850-1/ADA4850-2 are designed to work in the
extended temperature range of −40°C to +125°C.
2
1
0
The ADA4850-1/ADA4850-2 are designed to operate at supply
voltages as low as 2.7 V and up to 6 V at 2.4 mA of supply
current per amplifier. In power-down mode, the supply current
is less than 150 nA, ideal for battery-powered applications.
–1
–2
–3
The ADA4850-1/ADA4850-2 family provides users with a true
single-supply capability, allowing input signals to extend
200 mV below the negative rail and to within 2.2 V of the
positive rail. The output of the amplifier can swing within
80 mV of either supply rail.
–4
G = +1
V
= 5V
S
–5
–6
R
V
= 1k
L
= 0.1V p-p
OUT
1
10
100
1000
FREQUENCY (MHz)
With its combination of low price, excellent differential gain
(0.12%), differential phase (0.09°), and 0.1 dB flatness out to
14 MHz, these amplifiers are ideal for video applications.
Figure 3. Small Signal Frequency Response
Rev. D
Document Feedback
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 ©2005–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
ADA4850-1/ADA4850-2
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Circuit Description......................................................................... 12
Headroom and Overdrive Recovery Considerations............ 12
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Specifications with +3 V Supply................................................. 3
Specifications with +5 V Supply................................................. 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
Operating the ADA4850-1/ADA4850-2 on Bipolar Supplies
....................................................................................................... 13
Power-Down Pins....................................................................... 13
Outline Dimensions....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
5/16—Rev. C to Rev. D
4/05—Rev. 0 to Rev. A
Change CP-8-2 to CP-8-13 and CP-16-3 to CP-16-21 ..Throughout
Changes to Figure 1 and Figure 2................................................... 1
Updated Outline Dimensions....................................................... 14
Changes to Ordering Guide .......................................................... 14
Added ADA4850-1.............................................................Universal
Added 8-Lead LFCSP.........................................................Universal
Changes to Features ..........................................................................1
Changes to General Description .....................................................1
Changes to Figure 3...........................................................................1
Changes to Table 1.............................................................................3
Changes to Table 2.............................................................................4
Changes to Power-Down Pins Section and Table 5................... 13
Updated Outline Dimensions....................................................... 14
Changes to Ordering Guide.......................................................... 14
5/12—Rev. B to Rev. C
Added Exposed Pat Notation to Figure 1 and Figure 2............... 1
Changes to Table 4 and Figure 4..................................................... 5
Added Exposed Pad Notation to Outline Dimensions ............. 14
Changes to Ordering Guide .......................................................... 14
12/07—Rev. A to Rev. B
2/05—Revision 0: Initial Version
Changes to Applications .................................................................. 1
Updated Outline Dimensions....................................................... 14
Changes to Ordering Guide .......................................................... 14
Rev. D | Page 2 of 14
Data Sheet
ADA4850-1/ADA4850-2
SPECIFICATIONS
SPECIFICATIONS WITH +3 V SUPPLY
TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.
Table 1.
Parameter
Test Conditions/Comments
Min
Typ
Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth
G = +1, VO = 0.1 V p-p
160
45
14
110
80
MHz
MHz
MHz
V/µs
ns
G = +2, VO = 0.5 V p-p, RL = 150 Ω
G = +2, VO = 0.5 V p-p, RL = 150 Ω
G = +2, VO = 1 V step
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
G = +2, VO = 1 V step, RL = 150 Ω
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion (dBc) HD2/HD3
Input Voltage Noise
fC = 1 MHz, VO = 2 V p-p, G = +3, RL = 150 Ω
f = 100 kHz
−72/−77
10
dBc
nV/√Hz
Input Current Noise
Differential Gain
Differential Phase
f = 100 kHz
G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p
G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p
2.5
0.2
0.2
pA/√Hz
%
Degrees
DC PERFORMANCE
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
0.6
4
2.4
4
30
100
4.1
4.4
mV
µV/°C
µA
nA/°C
nA
dB
VO = 0.25 V to 0.75 V
78
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Input Overdrive Recovery Time (Rise/Fall)
Common-Mode Rejection Ratio
POWER-DOWN
Differential/common-mode
0.5/5.0
1.2
−0.2 to +0.8
60/50
MΩ
pF
V
ns
dB
VIN = +3.5 V to −0.5 V, G = +1
VCM = 0.5 V
−76
−108
Power-Down Input Voltage
Power-down ADA4850-1/ADA4850-2
Enabled ADA4850-1/ADA4850-2
<0.7/<0.6
>0.8/>1.7
0.7
V
V
µs
ns
Turn-Off Time
Turn-On Time
60
Power-Down Bias Current/ Power Down Pin
Enabled
Power-Down
Power-down = 3 V
Power-down = 0 V
37
0.01
55
0.2
µA
µA
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time (Rise/Fall)
Output Voltage Swing
VIN = +0.7 V to −0.1 V, G = +5
Sinking/sourcing
70/100
0.06 to 2.83 0.03 to 2.92
105/74
ns
V
mA
Short-Circuit Current
POWER SUPPLY
Operating Range1
2.7
2.4
15
6
2.8
150
V
Quiescent Current/Amplifier
Quiescent Current (Power-Down)/Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
mA
nA
dB
dB
+VS = +3 V to +4 V, −VS = 0 V
+VS = +3 V, −VS = 0 V to –1 V
−83
−83
−100
−102
1 For operation on bipolar supplies, see the Operating the ADA4850-1/ADA4850-2 on Bipolar Supplies section.
Rev. D | Page 3 of 14
ADA4850-1/ADA4850-2
Data Sheet
SPECIFICATIONS WITH +5 V SUPPLY
TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.
Table 2.
Parameter
Test Conditions/Comments
Min
Typ
Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth
G = +1, VO = 0.1 V p-p
G = +1, VO = 0.5 V p-p
G = +2, VO = 1.4 V p-p, RL = 150 Ω
G = +2, VO = 4 V step
G = +2, VO = 2 V step
175
110
9
220
160
85
MHz
MHz
MHz
V/µs
V/µs
ns
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion (dBc) HD2/HD3
Input Voltage Noise
Input Current Noise
Differential Gain
Differential Phase
Crosstalk (RTI)–ADA4850-2
DC PERFORMANCE
G = +2, VO = 1 V step, RL = 150 Ω
fC = 1 MHz, VO = 2 V p-p, G = +2, RL = 150 Ω
f = 100 kHz
f = 100 kHz
G = +3, NTSC, RL = 150 Ω
G = +3, NTSC, RL = 150 Ω
f = 4.5 MHz, RL = 150 Ω, VO = 2 V p-p
−81/−86
10
2.5
0.12
0.09
60
dBc
nV/√Hz
pA/√Hz
%
Degrees
dB
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
0.6
4
2.3
4
30
105
4.2
4.2
mV
µV/°C
µA
nA/°C
nA
dB
VO = 2.25 V to 2.75 V
83
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Input Overdrive Recovery Time (Rise/Fall)
Common-Mode Rejection Ratio
POWER-DOWN
Differential/common-mode
0.5/5.0
1.2
−0.2 to +2.8
50/40
MΩ
pF
V
ns
dB
VIN = +5.5 V to −0.5 V, G = +1
VCM = 2.0 V
−85
−110
Power-Down Input Voltage
Power-down ADA4850-1/ADA4850-2
Enabled ADA4850-1/ADA4850-2
<0.7/<0.6
>0.8/>1.7
0.7
V
V
µs
ns
Turn-Off Time
Turn-On Time
50
Power-Down Bias Current/Power Down Pin
Enabled
Power-Down
Power-down = 5 V
Power-down = 0 V
0.05
0.02
0.13 mA
0.2
µA
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time (Rise/Fall)
Output Voltage Swing
VIN = +1.1 V to −0.1 V, G = +5
Sinking/sourcing
60/70
ns
V
mA
0.14 to 4.83 0.07 to 4.92
118/94
Short-Circuit Current
POWER SUPPLY
Operating Range1
2.7
2.5
15
6
2.9
150
V
Quiescent Current/Amplifier
Quiescent Current (Power-Down)/Amplifier
Positive Power Supply Rejection
Negative Power Supply Rejection
mA
nA
dB
dB
+VS = +5 V to +6 V, −VS = 0 V
+VS = +5 V, −VS = −0 V to −1 V
−84
−84
−100
−102
1 For operation on bipolar supplies, see the Operating the ADA4850-1/ADA4850-2 on Bipolar Supplies section.
Rev. D | Page 4 of 14
Data Sheet
ADA4850-1/ADA4850-2
ABSOLUTE MAXIMUM RATINGS
Table 3.
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the die
due to the ADA4850-1/ADA4850-2 drive at the output. The
quiescent power is the voltage between the supply pins (VS)
times the quiescent current (IS).
Parameter
Rating
Supply Voltage
12.6 V
Power Dissipation
Power Down Pin Voltage
See Figure 4
(−VS + 6) V
PD = Quiescent Power + (Total Drive Power − Load Power)
Common-Mode Input Voltage Range (−VS − 0.5 ) V to (+VS + 0.5) V
2
Differential Input Voltage Range
Storage Temperature Range
Operating Temperature Range
Lead Temperature Range
(Soldering 10 sec)
+VS to −VS
VS VOUT
VOUT
RL
PD =
(
VS ×IS
)
+
×
−
−65°C to +125°C
−40°C to +125°C
300°C
2
RL
Consider rms output voltages. If RL is referenced to −VS, as in
single-supply operation, the total drive power is VS × IOUT. If the
rms signal levels are indeterminate, consider the worst case,
when VOUT = VS/4 for RL to midsupply.
Junction Temperature
150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
2
(
VS /4
RL
)
PD =
(
VS × IS
)
+
In single-supply operation with RL referenced to −VS, the worst
case is VOUT = VS/2.
Airflow increases heat dissipation, effectively reducing θJA. In
addition, more metal directly in contact with the package leads
and exposed paddle from metal traces through holes, ground,
and power planes reduce θJA.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, θJA is specified
for the device soldered in the circuit board for surface-mount
packages.
Figure 4 shows the maximum safe power dissipation in the
package vs. the ambient temperature for the LFCSP (91°C/W)
package on a JEDEC standard 4-layer board. θJA values are
approximations.
Table 4.
Package Type
16-Lead LFCSP
8-Lead LFCSP
θJA
72.8
80
Unit
°C/W
°C/W
3.0
T
= 150°C
J
2.5
2.0
1.5
1.0
0.5
0
Maximum Power Dissipation
LFCSP-16
The maximum safe power dissipation for the ADA4850-1/
ADA4850-2 is limited by the associated rise in junction
temperature (TJ) on the die. At approximately 150°C, which
is the glass transition temperature, the plastic changes its
properties. Even temporarily exceeding this temperature limit
may change the stresses that the package exerts on the die,
permanently shifting the parametric performance of the
ADA4850-1/ADA4850-2. Exceeding a junction temperature
of 150°C for an extended period of time can result in changes
in silicon devices, potentially causing degradation or loss of
functionality.
LFCSP-8
–55 –45 –35 –25 –15 –5
5
15 25 35 45 55 65 75 85 95 105 115 125
AMBIENT TEMPERATURE (°C)
Figure 4. Maximum Power Dissipation vs. Temperature for a 4-Layer Board
ESD CAUTION
Rev. D | Page 5 of 14
ADA4850-1/ADA4850-2
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.
4
1
6pF
G = +1
V
R
V
= 5V
= 150
V
= 5V
S
3
2
S
R
V
= 1k
L
L
0
–1
–2
–3
–4
–5
–6
= 0.1V p-p
= 0.1V p-p
OUT
OUT
1
G = –1
0
G = +2
1pF
0pF
–1
–2
–3
–4
–5
–6
G = +10
1
10
FREQUENCY (MHz)
100
300
1
10
FREQUENCY (MHz)
100
Figure 5. Small Signal Frequency Response for Various Gains
Figure 8. Small Signal Frequency Response for Various Capacitor Loads
2
6.2
V
= 5V
S
1
0
G = +2
= 150
R
= 150
L
6.1
6.0
5.9
5.8
5.7
5.6
5.5
5.4
R
L
–1
–2
–3
–4
V
= 5V, V
= 2V p-p
S
OUT
R
= 1k
L
V
= 5V, V
= 1.4V p-p
= 0.5V p-p
OUT
S
OUT
V
= 3V, V
S
V
= 5V, V = 0.1V p-p
OUT
S
V
= 5V
S
G = +1
= 0.1V p-p
–5
–6
V
OUT
100k
1M
10M
FREQUENCY (Hz)
100M
1
10
100
1000
FREQUENCY (MHz)
Figure 6. Small Signal Frequency Response for Various Loads
Figure 9. 0.1 dB Flatness Response
3
2
1
0
V
= 5V
S
G = +1
V
= 0.5V p-p
OUT
V
= 3V
S
1
–1
–2
–3
–4
–5
R
= 150
L
0
–1
–2
–3
–4
–5
–6
R
= 1k
L
V
= 5V
S
G = +1
–6
–7
R
= 150
L
V
= 0.1V p-p
OUT
1
10
100
1000
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
Figure 10. Large Frequency Response for Various Loads
Figure 7. Small Signal Frequency Response for Various Supplies
Rev. D | Page 6 of 14
Data Sheet
ADA4850-1/ADA4850-2
3
300
250
200
150
100
50
G = +2
= 5V
V
= 3V
S
+125C
+85C
V
G = +1
R
V
S
2
1
R
= 1k
= 1k
L
NEGATIVE SLEW RATE
L
= 0.1V p-p
OUT
0
POSITIVE SLEW RATE
+25C
–40C
–1
–2
–3
–4
–5
0
1
10
100
1000
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
FREQUENCY (MHz)
OUTPUT VOLTAGE STEP (V)
Figure 11. Small Signal Frequency Response for Various Temperatures
Figure 14. Slew Rate vs. Output Voltage
10k
1k
3
V
= 5V
S
G = +1
= 1k
2
1
R
L
+125C
+85C
V
= 0.1V p-p
OUT
V
= 3V, 5V, ADA4850-2
S
0
100
10
–1
–2
–3
–4
–5
+25C
–40C
V
= 3V, 5V, ADA4850-1 ENABLE
S
V
= 3V, 5V, ADA4850-1 POWER DOWN
S
1
0.1
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
1
10
100
1000
FREQUENCY (MHz)
POWER-DOWN VOLTAGE (V)
Figure 12. Small Signal Frequency Response for Various Temperatures
Figure 15. Supply Current vs. Power-Down Voltage
140
120
100
80
0
–40
–50
–60
–70
–80
–90
–100
G = +2
V
= 5V
S
V
= 5V
S
–30
R
= 150
L
V
= 2V p-p
OUT
–60
PHASE
–90
V
2 TO V
1
OUT
OUT
60
–120
–150
–180
–210
–240
40
GAIN
V
1 TO V
2
OUT
OUT
20
0
–20
10
100
1k
10k
100k
1M
10M
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
FREQUENCY (Hz)
Figure 16. Crosstalk vs. Frequency
Figure 13. Open-Loop Gain and Phase vs. Frequency
Rev. D | Page 7 of 14
ADA4850-1/ADA4850-2
Data Sheet
–40
2.575
2.550
2.525
2.500
2.475
2.450
2.425
10pF
0pF
G = +1
G = +1
V
V
= 5V
V
= 5V
S
S
–50
–60
= 500mV p-p
R
= 150
OUT
L
R
= 1k HD2
L
–70
R
= 150 HD2
L
–80
R
= 1k HD3
L
–90
R
= 150 HD3
–100
–110
L
0.1
1
10
100
0
20
40
60
80
100 120 140 160 180 200
TIME (ns)
FREQUENCY (MHz)
Figure 17. Harmonic Distortion vs. Frequency for Various Loads
Figure 20. Small Signal Transient Response for Capacitive Load
–50
3.25
G = +2
G = +2
V
= 5V
R
V
= 1k
S
L
= 5V
R
= 1k
S
L
–60
–70
V
= 500mV p-p
HD2
OUT
3.00
2.75
2.50
2.25
2.00
1.75
V
= 200mV p-p
HD2
OUT
–80
–90
V
= 200mV p-p
OUT
HD3
–100
–110
–120
V
= 500mV p-p
OUT
HD3
0.1
1
10
100
0
50
100
150
200
FREQUENCY (MHz)
TIME (ns)
Figure 18. Harmonic Distortion vs. Frequency for Various VOUT
Figure 21. Large Signal Transient Response
0.65
2.875
2.750
2.625
2.500
2.375
2.250
2.125
0.875
G = +2
G = +1
= 1k
R
= 1k
L
S
R
L
V
= 5V
0.60
0.55
0.50
0.45
0.40
0.35
0.750
0.625
0.500
0.375
0.250
0.125
V
= 5V
S
V
= 3V
S
0
50
100
150
200
0
50
100
150
200
TIME (ns)
TIME (ns)
Figure 19. Small Signal Transient Response for Various Supplies
Figure 22. Large Signal Transient Response for Various Supplies
Rev. D | Page 8 of 14
Data Sheet
ADA4850-1/ADA4850-2
6
1000
100
10
G = +2
V
= 5V
S
f
= 400kHz
IN
5
V
4
3
DISABLE
2
1
0
V
OUT
–1
1
10
100
1k
10k
100k
1M
10M
100M
0
15
30
45
TIME (s)
FREQUENCY (Hz)
Figure 23. Enable/Disable Time
Figure 26. Voltage Noise vs. Frequency
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
10
1
G = +1
V
= 5V
S
INPUT
R
= 150
L
f = 1MHz
OUTPUT
–0.5
0
100 200 300 400 500 600 700 800 900 1000
TIME (ns)
10
100
1k
10k
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 24. Input Overdrive Recovery
Figure 27. Current Noise vs. Frequency
350
300
250
200
150
100
50
3.5
3.0
V
= 5V
S
G = +5
N = 1720
x = 450V
= 750V
V
= 3V
S
R
= 150
L
OUTPUT
f = 1MHz
2.5
2.0
1.5
1.0
0.5
0
5 INPUT
0
–4
–0.5
–3
–2
–1
0
1
2
3
4
0
100 200 300 400 500 600 700 800 900 1000
TIME (ns)
V
(mV)
OFFSET
Figure 25. Output Overdrive Recovery
Figure 28. Input Offset Voltage Distribution
Rev. D | Page 9 of 14
ADA4850-1/ADA4850-2
Data Sheet
400
380
–1.2
–1.4
–1.6
–1.8
–2.0
–2.2
–2.4
+I
B
V
= 5V
S
360
340
320
300
280
260
240
220
200
V
= 5V
S
–I
B
V
= 3V
S
–1.0 –0.5
0
0.5
1.0
V
1.5
(V)
2.0
2.5
3.0
3.5
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (C)
CM
Figure 29. Input Offset Voltage vs. Common-Mode Voltage
Figure 32. Input Bias Current vs. Temperature for Various Supplies
95
0.6
0.5
0.4
0.3
0.2
0.1
0
V
R
= 5V
= 1k
S
L
V
= 3V
90
85
80
75
70
65
S
+V
SAT
+V – V
S
OUT
–V
SAT
–V – V
OUT
S
V
= 5V
S
–40 –25 –10
5
20
35
50
65
80
95 110 125
0
5
10
15
20
25
30
35
40
45
50
TEMPERATURE (C)
LOAD CURRENT (mA)
Figure 30. Output Saturation Voltage vs. Load Current
(Voltage Differential from Rails)
Figure 33. Output Saturation Voltage vs. Temperature
(Voltage Differential from Rails)
4.9
–30
–32
–34
–36
–38
–40
–42
–44
–46
4.8
4.7
4.6
4.5
4.4
4.3
4.2
V
= 3V
S
V
= 5V
S
V
= 3V
S
V
= 5V
S
–40 –25 –10
5
20
35
50
65
80
95 110 125
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (C)
TEMPERATURE (C)
Figure 31. Power-Down Bias Current vs. Temperature for Various Supplies
Figure 34. Current vs. Temperature for Various Supplies
Rev. D | Page 10 of 14
Data Sheet
ADA4850-1/ADA4850-2
0
–20
–30
V
= 5V
V = 5V
S
S
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–40
–50
+PSR
CHANNEL 1
–60
–70
CHANNEL 2
–PSR
–80
–90
–100
–110
–120
1k
10k
100k
1M
10M
100M
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
Figure 37. Common-Mode Rejection (CMR) vs. Frequency
Figure 35. Power Supply Rejection (PSR) vs. Frequency
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
= 5V
S
V
= 3V
S
–0.1
–40 –25 –10
5
20
35
50
65
80
95 110 125
TEMPERATURE (C)
Figure 36. Input Offset Voltage vs. Temperature for Various Supplies
Rev. D | Page 11 of 14
ADA4850-1/ADA4850-2
Data Sheet
CIRCUIT DESCRIPTION
The ADA4850-1/ADA4850-2 feature a high slew rate input
stage that is a true single-supply topology, capable of sensing
signals at or below the negative supply rail. The rail-to-rail output
stage can swing to within 80 mV of either supply rail when driving
light loads and within 0.17 V when driving 150 Ω. High speed
performance is maintained at supply voltages as low as 2.7 V.
Higher frequency signals require more headroom than the
lower frequencies to maintain distortion performance. Figure 39
illustrates how the rising edge settling time for the amplifier
configured as a unity-gain follower stretches out as the top of
a 1 V step input approaches and exceeds the specified input
common-mode voltage limit.
3.6
HEADROOM AND OVERDRIVE RECOVERY
CONSIDERATIONS
Input
V
= 5V
S
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
1.8
G = +1
R
= 1kΩ
L
The ADA4850-1/ADA4850-2 are designed for use in low voltage
systems. To obtain optimum performance, it is useful to
understand the behavior of the amplifier as input and output
signals approach the headroom limits of the amplifier. The
input common-mode voltage range extends 200 mV below the
negative supply voltage or ground for single-supply operation to
within 2.2 V of the positive supply voltage. Therefore, in a gain
of +3, the ADA4850-1/ADA4850-2 can provide full rail-to-rail
output swing for supply voltage as low as 3.3 V, assuming the
input signal swing is from −VS (or ground) to 1.1 V.
V
= 2V TO 3V
STEP
V
= 2.1V TO 3.1V
STEP
V
= 2.2V TO 3.2V
STEP
V
= 2.3V TO 3.3V
STEP
V
= 2.4V TO 3.4V
STEP
0
10
20
30
40
50
60
70
80
90
100
TIME (ns)
Exceeding the headroom limit is not a concern for any inverting
gain on any supply voltage, as long as the reference voltage at
the positive input of the amplifier lies within the input
common-mode range of the amplifier.
Figure 39. Pulse Response, Input Headroom Limits
The recovery time from input voltages 2.2 V or closer to the
positive supply is approximately 50 ns, which is limited by the
settling artifacts caused by transistors in the input stage coming
out of saturation.
The input stage sets the headroom limit for signals when the
amplifier is used in a gain of +1 for signals approaching the
positive rail. For high speed signals, however, there are other
considerations. Figure 38 shows −3 dB bandwidth vs. dc input
voltage for a unity-gain follower. As the common-mode voltage
approaches the positive supply, the bandwidth begins to drop
when within 2 V of +VS. This can manifest itself in increased
distortion or settling time.
The ADA4850-1/ADA4850-2 do not exhibit phase reversal, even
for input voltages beyond the voltage supply rails. Going more than
0.6 V beyond the power supplies turns on protection diodes at the
input stage, which greatly increase the current draw of the devices.
Output
For signals approaching the negative supply and inverting gain,
and high positive gain configurations, the headroom limit is the
output stage. The ADA4850-1/ADA4850-2 amplifiers use a
common-emitter output stage. This output stage maximizes the
available output range, limited by the saturation voltage of the
output transistors. The saturation voltage increases with drive
current, due to the output transistor collector resistance.
2
V
V
V
V
= 3V
CM
CM
CM
CM
1
0
= 3.1V
= 3.2V
= 3.3V
–1
–2
–3
–4
–5
–6
As the saturation point of the output stage is approached, the
output signal shows increasing amounts of compression and
clipping. As in the input headroom case, higher frequency signals
require a bit more headroom than the lower frequency signals.
V
= 5V
S
G = +1
R
V
= 1kΩ
= 0.1V p-p
L
OUT
Output overload recovery is typically within 40 ns after the
input of the amplifier is brought to a nonoverloading value.
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 38. Unity-Gain Follower Bandwidth vs.
Frequency for Various Input Common-Mode
Rev. D | Page 12 of 14
Data Sheet
ADA4850-1/ADA4850-2
Figure 40 shows the output recovery transients for the amplifier
recovering from a saturated output from the top and bottom
supplies to a point at midsupply.
OPERATING THE ADA4850-1/ADA4850-2 ON
BIPOLAR SUPPLIES
The ADA4850-1/ADA4850-2 can operate on bipolar supplies
up to 5 V. The only restriction is that the voltage between −VS
and the POWER DOWN pin must not exceed 6 V. Voltage
differences greater than 6 V can cause permanent damage to the
amplifier. For example, when operating on 5 V supplies, the
POWER DOWN pin must not exceed +1 V.
6.5
V
= 5V
S
V
= +2.5V TO 0V
G = –1
OUT
5.5
4.5
R
= 1kΩ
L
3.5
INPUT
VOLTAGE
EDGES
POWER-DOWN PINS
2.5
The ADA4850-1/ADA4850-2 feature an ultralow power-down
mode that lowers the supply current to less than 150 nA. When
a power-down pin is brought to within 0.6 V of the negative
supply, the amplifier is powered down. Table 5 outlines the
power-down pins functionality. To ensure proper operation, do
not leave the power-down pins (PD1, PD2) floating.
1.5
0.5
V
= –2.5V TO 0V
OUT
–0.5
–1.5
0
10
20
30
40
50
TIME (ns)
60
70
80
90
100
Table 5. Power-Down Pins Functionality
Figure 40. Overload Recovery
3 V and 5 V
Supply Voltage
Power Down
Enabled
ADA4850-1
0 V to 0.7 V
0.8 to +VS
ADA4850-2
0 V to 0.6 V
1.7 V to +VS
Rev. D | Page 13 of 14
ADA4850-1/ADA4850-2
OUTLINE DIMENSIONS
Data Sheet
1.84
1.74
1.64
3.10
3.00 SQ
2.90
0.50 BSC
8
5
PIN 1 INDEX
AREA
EXPOSED
PAD
1.55
1.45
1.35
0.50
0.40
0.30
4
1
PIN 1
INDICATOR
(R 0.15)
TOP VIEW
BOTTOM VIEW
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
0.80
0.75
0.70
0.05 MAX
0.02 NOM
COPLANARITY
0.08
SECTION OF THIS DATA SHEET.
SEATING
PLANE
0.30
0.25
0.20
0.203 REF
COMPLIANT TO JEDEC STANDARDS MO-229-WEED
Figure 41. 8-Lead Lead Frame Chip Scale Package [LFCSP]
3 mm × 3 mm Body and 0.75 mm Package Height
(CP-8-13)
Dimensions shown in millimeters
3.10
3.00 SQ
2.90
0.30
0.23
0.18
PIN 1
INDICATOR
PIN 1
INDICATOR
13
16
0.50
BSC
12
1
4
EXPOSED
PAD
1.45
1.30 SQ
1.15
9
0.25 MIN
8
5
0.50
0.40
0.30
TOP VIEW
BOTTOM VIEW
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
0.80
0.75
0.70
0.05 MAX
0.02 NOM
COPLANARITY
0.08
SECTION OF THIS DATA SHEET.
SEATING
PLANE
0.20 REF
COMPLIANT TO JEDEC STANDARDS MO-220-WEED.
Figure 42. 16-Lead Lead Frame Chip Scale Package [LFCSP]
3 mm × 3 mm Body and 0.75 mm Package Height
(CP-16-21)
Dimensions shown in millimeters
ORDERING GUIDE
Model1
Temperature Range
Package Description
Package Option
Branding
HWB
ADA4850-1YCPZ-RL7
ADA4850-2YCPZ-RL
ADA4850-2YCPZ-RL7
ADA4850-2YCP-EBZ
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
8-Lead Lead Frame Chip Scale Package [LFCSP]
16-Lead Lead Frame Chip Scale Package [LFCSP]
16-Lead Lead Frame Chip Scale Package [LFCSP]
Evaluation Board for 16-Lead LFCP
CP-8-13
CP-16-21
CP-16-21
HTB
HTB
1 Z = RoHS Compliant Part.
©2005–2016 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05320-0-5/16(D)
Rev. D | Page 14 of 14
相关型号：
ADA4851-1ART-R2
IC OP-AMP, 5000 uV OFFSET-MAX, PDSO6, MO-178AB, SOT-23, 6 PIN, Operational Amplifier
ADI
ADA4851-1ART-REEL
IC OP-AMP, 5000 uV OFFSET-MAX, PDSO6, MO-178AB, SOT-23, 6 PIN, Operational Amplifier
ADI
ADA4851-1ART-REEL7
IC OP-AMP, 5000 uV OFFSET-MAX, PDSO6, MO-178AB, SOT-23, 6 PIN, Operational Amplifier
ADI
ADA4851-1YRJZ-RL
1 CHANNEL, VIDEO AMPLIFIER, PDSO6, ROHS COMPLIANT, MO-178AB, SOT-23, 6 PIN
ROCHESTER
©2020 ICPDF网 联系我们和版权申明