ADA4851-4YRUZ-RL [ADI]
Low Cost, High Speed, Rail-to-Rail Output Op Amps; 低成本，高速，轨到轨输出运算放大器
| 型号： | ADA4851-4YRUZ-RL |
| 厂家： | 
ADI |
| 描述： | Low Cost, High Speed, Rail-to-Rail Output Op Amps |
| 文件： | 总20页 (文件大小：414K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Cost, High Speed,
Rail-to-Rail Output Op Amps
ADA4851-1/ADA4851-2/ADA4851-4
FEATURES
PIN CONFIGURATIONS
High speed
130 MHz, −3 dB bandwidth
375 V/μs slew rate
55 ns settling time to 0.1%
Excellent video specifications
0.1 dB flatness: 11 MHz
ADA4851-1
V
1
2
3
6
5
4
+V
S
OUT
–V
POWER DOWN
–IN
S
+IN
TOP VIEW (Not to Scale)
Figure 1. ADA4851-1, 6-Lead SOT-23 (RJ-6)
Differential gain: 0.08%
ADA4851-2
Differential phase: 0.09°
OUT1
–IN1
+IN1
1
2
3
4
8
7
6
5
+V
S
Fully specified at +3 V, +5 V, and 5 V supplies
Rail-to-rail output
OUT
–IN2
+IN2
Output swings to within 60 mV of either rail
Low voltage offset: 0.6 mV
Wide supply range: 3 V to 10 V
Low power: 2.5 mA/amplifier
Power-down mode
–V
S
TOP VIEW
(Not to Scale)
Figure 2. ADA4851-2, 8-Lead MSOP (RM-8)
1
2
3
4
5
6
7
14
13
12
11
V
1
V
4
Available in space-saving packages
SOT-23-6, TSSOP-14, and MSOP-8
OUT
OUT
–IN 4
+IN 4
–IN 1
+IN 1
APPLICATIONS
ADA4851-4
TOP VIEW
(Not to Scale)
–V
S
+V
S
Consumer video
Professional video
Video switchers
Active filters
10 +IN 3
+IN 2
–IN 2
9
8
–IN 3
V
3
V
2
OUT
OUT
Figure 3. ADA4851-4, 14-Lead TSSOP (RU-14)
GENERAL DESCRIPTION
The ADA4851-1 (single)/ADA4851-2 (dual)/ADA4851-4
(quad) are low cost, high speed, voltage feedback rail-to-rail
output op amps. Despite their low price, these parts provide
excellent overall performance and versatility. The 130 MHz,
−3 dB bandwidth and high slew rate make these amplifiers well-
suited for many general-purpose, high speed applications.
The ADA4851 family is designed to work over the extended
temperature range (−40°C to +125°C).
4
G = +1
V
R
C
= 5V
= 1kΩ
= 5pF
3
2
S
L
L
1
0
The ADA4851 family is designed to operate at supply voltages
as low as +3 V and up to 5 V. These parts provide 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.
On the output, the amplifiers can swing within 60 mV of either
supply rail.
–1
–2
–3
–4
–5
–6
With their combination of low price, excellent differential gain
(0.08%), differential phase (0.09º), and 0.1 dB flatness out to
11 MHz, these amplifiers are ideal for consumer video
applications.
1
10
100
1k
FREQUENCY (MHz)
Figure 4. Small Signal Frequency Response
Rev. C
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
registered trademarks are the 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
©2005 Analog Devices, Inc. All rights reserved.
ADA4851-1/ADA4851-2/ADA4851-4
TABLE OF CONTENTS
Specifications..................................................................................... 3
Typical Performance Characteristics ..............................................7
Circuit Description......................................................................... 13
Headroom Considerations........................................................ 13
Overload Behavior and Recovery ............................................ 14
Single-Supply Video Amplifier................................................. 15
Outline Dimensions....................................................................... 16
Ordering Guide .......................................................................... 17
Specifications with +3 V Supply................................................. 3
Specifications with +5 V Supply................................................. 4
Specifications with 5 V Supply................................................. 5
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
REVISION HISTORY
5/05—Rev. B to Rev. C
1/05—Rev. 0 to Rev. A
Changes to General Description .................................................... 1
Changes to Input Section............................................................... 14
Added ADA4851-4.............................................................Universal
Added 14-Lead TSSOP......................................................Universal
Changes to Features ..........................................................................1
Changes to General Description .....................................................1
Changes to Figure 3...........................................................................1
Changes to Specifications.................................................................3
Changes to Figure 4...........................................................................6
Changes to Figure 8...........................................................................7
Changes to Figure 11.........................................................................8
Changes to Figure 22.........................................................................9
Changes to Figure 23, Figure 24, and Figure 25......................... 10
Changes to Figure 27 and Figure 28............................................. 10
Changes to Figure 29, Figure 30, and Figure 31......................... 11
Changes to Figure 34...................................................................... 11
Added Figure 37 ............................................................................. 12
Changes to Ordering Guide.......................................................... 15
Updated Outline Dimensions....................................................... 15
4/05—Rev. A to Rev. B
Added ADA4851-2.............................................................Universal
Added 8-Lead MSOP .........................................................Universal
Changes to Features.......................................................................... 1
Changes to General Description .................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 3............................................................................ 5
Changes to Table 4 and Figure 5..................................................... 6
Changes to Figure 12, Figure 15, and Figure 17 ........................... 8
Changes to Figure 18........................................................................ 9
Changes to Figure 28 Caption....................................................... 10
Changes to Figure 33...................................................................... 11
Changes to Figure 36 and Figure 38............................................. 12
Added Figure 39.............................................................................. 12
Changes to Circuit Description Section...................................... 13
Changes to Headroom Considerations Section ......................... 13
Changes to Overload Behavior and Recovery Section.............. 14
Added Single-Supply Video Amplifier Section .......................... 15
Updated Outline Dimensions....................................................... 16
Changes to Ordering Guide .......................................................... 17
10/04—Revision 0: Initial Version
Rev. C | Page 2 of 20
ADA4851-1/ADA4851-2/ADA4851-4
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
Conditions
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 = 1.0 V p-p, RL = 150 Ω
G = +2, VO = 1 V p-p, RL = 150 Ω
G = +2, VO = 1 V step
104
80
130
105
40
15
100
50
MHz
MHz
MHz
MHz
V/μs
ns
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 = 1 V p-p, G = −1
f = 100 kHz
−73/−79
10
dBc
nV/√Hz
Input Current Noise
Differential Gain
Differential Phase
Crosstalk (RTI)—ADA4851-2/ADA4851-4
DC PERFORMANCE
f = 100 kHz
2.5
0.44
0.41
−70/−60
pA/√Hz
%
Degrees
dB
G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p
G = +3, NTSC, RL = 150 Ω, VO = 2 V p-p
f = 5 MHz, G = +2, VO = 1.0 V p-p
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
6
20
105
3.3
4.0
mV
μV/°C
μA
nA/°C
nA
dB
VO = 0.25 V to 0.75 V
80
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
60/60
MΩ
pF
V
ns
dB
VIN = +3.5 V, −0.5 V, G = +1
VCM = 0 V to 0.5 V
−81
−103
Power-Down Input Voltage
Power-down
Enabled
<1.1
>1.6
0.7
V
V
μs
ns
Turn-Off Time
Turn-On Time
60
Power-Down Bias Current
Enabled
Power-Down
Power-down = 3 V
Power-down = 0 V
4
−14
6
−20
μA
μA
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time (Rise/Fall)
Output Voltage Swing
Short-Circuit Current
VIN = +0.7 V, −0.1 V, G = +5
Sinking/sourcing
70/100
0.03 to 2.94
90/70
ns
V
mA
0.05 to 2.91
2.7
POWER SUPPLY
Operating Range
12
V
Quiescent Current per Amplifier
Quiescent Current (Power-Down)
Positive Power Supply Rejection
Negative Power Supply Rejection
2.4
0.2
−100
−100
2.7
0.3
mA
mA
dB
dB
Power-down = low
+VS = +2.5 V to +3.5 V, −VS = −0.5 V
+VS = +2.5 V, −VS = −0.5 V to –1.5 V
−81
−80
Rev. C | Page 3 of 20
ADA4851-1/ADA4851-2/ADA4851-4
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
Conditions
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 = 1.4 V p-p, RL = 150 Ω
G = +2, VO = 2 V step
96
72
125
96
35
11
200
55
MHz
MHz
MHz
MHz
V/μs
ns
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
G = +2, VO = 2 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 = +1
f = 100 kHz
−80/−100
10
dBc
nV/√Hz
Input Current Noise
Differential Gain
Differential Phase
Crosstalk (RTI)—ADA4851-2/ADA4851-4
DC PERFORMANCE
f = 100 kHz
2.5
0.08
0.11
−70/−60
pA/√Hz
%
Degrees
dB
G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p
G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p
f = 5 MHz, G = +2, VO = 2.0 V p-p
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
0.6
4
2.2
6
20
107
3.4
3.9
mV
μV/°C
μA
nA/°C
nA
dB
VO = 1 V to 4 V
97
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
50/45
MΩ
pF
V
ns
dB
VIN = +5.5 V, −0.5 V, G = +1
VCM = 0 V to 2 V
−86
−105
Power-Down Input Voltage
Power-down
Enabled
<1.1
>1.6
0.7
V
V
μs
ns
Turn-Off Time
Turn-On Time
50
Power-Down Bias Current
Enabled
Power-Down
Power-down = 5 V
Power-down = 0 V
33
−22
40
−30
μA
μA
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time (Rise/Fall)
Output Voltage Swing
Short-Circuit Current
VIN = +1.1 V, −0.1 V, G = +5
Sinking/sourcing
60/70
0.06 to 4.94
110/90
ns
V
mA
0.09 to 4.91
2.7
POWER SUPPLY
Operating Range
12
V
Quiescent Current per Amplifier
Quiescent Current (Power-Down)
Positive Power Supply Rejection
Negative Power Supply Rejection
2.5
0.2
−101
−101
2.8
0.3
mA
mA
dB
dB
Power-down = low
+VS = +5 V to +6 V, −VS = 0 V
+VS = +5 V, −VS = −0 V to −1 V
−82
−81
Rev. C | Page 4 of 20
ADA4851-1/ADA4851-2/ADA4851-4
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 3.
Parameter
Conditions
Min
Typ
Max Unit
DYNAMIC PERFORMANCE
−3 dB Bandwidth
G = +1, VO = 0.1 V p-p
G = +1, VO = 1 V p-p
G = +2, VO = 2 V p-p, RL = 150 Ω
G = +2, VO = 2 V p-p, RL = 150 Ω
G = +2, VO = 7 V step
83
52
105
74
40
MHz
MHz
MHz
MHz
V/μs
V/μs
ns
Bandwidth for 0.1 dB Flatness
Slew Rate
11
375
190
55
G = +2, VO = 2 V step
G = +2, VO = 2 V step, RL = 150 Ω
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion (dBc) HD2/HD3
Input Voltage Noise
fC = 1 MHz, VO = 2 V p-p, G = +1
f = 100 kHz
−83/−107
10
dBc
nV/√Hz
Input Current Noise
Differential Gain
Differential Phase
Crosstalk(RTI)—ADA4851-2/ADA4851-4
DC PERFORMANCE
f = 100 kHz
2.5
0.08
0.09
−70/−60
pA/√Hz
%
Degrees
dB
G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p
G = +2, NTSC, RL = 150 Ω, VO = 2 V p-p
f = 5 MHz, G = +2, VO = 2.0 V p-p
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Bias Current Drift
Input Bias Offset Current
Open-Loop Gain
0.6
4
2.2
6
20
106
3.5
4.0
mV
μV/°C
μA
nA/°C
nA
dB
99
VO = ±2.5 V
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
−5.2 to +2.8
50/25
MΩ
pF
V
ns
dB
VIN = 6 V, G = +1
VCM = 0 V to 4 V
−90
−105
Power-Down Input Voltage
Power-down
Enabled
< −3.9
> −3.4
0.7
V
V
μs
ns
Turn-Off Time
Turn-On Time
30
Power-Down Bias Current
Enabled
Power-Down
Power-down = +5 V
Power-down = −5 V
100
−50
130
−60
μA
μA
OUTPUT CHARACTERISTICS
Output Overdrive Recovery Time (Rise/Fall) VIN = 1.2 V, G = +5
Output Voltage Swing
80/50
ns
V
mA
−4.87 to +4.88 −4.92 to +4.92
125/110
Short-Circuit Current
Sinking/sourcing
POWER SUPPLY
Operating Range
2.7
2.9
0.2
12
3.2
0.3
V
Quiescent Current per Amplifier
Quiescent Current (Power-Down)
Positive Power Supply Rejection
Negative Power Supply Rejection
mA
mA
dB
dB
Power-down = low
+VS = +5 V to +6 V, −VS = −5 V
+VS = +5 V, −VS = −5 V to −6 V
−82
−81
−101
−102
Rev. C | Page 5 of 20
ADA4851-1/ADA4851-2/ADA4851-4
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
due to the amplifiers’ drive at the output. The quiescent power
is the voltage between the supply pins (VS) times the quiescent
current (IS).
Rating
Supply Voltage
Power Dissipation
12.6 V
See Figure 5
−VS − 0.5 V to +VS + 0.5 V
+VS to −VS
−65°C to +125°C
−40°C to +125°C
JEDEC J-STD-20
150°C
PD = Quiescent Power + (Total Drive Power − Load Power)
Common-Mode Input Voltage
Differential Input Voltage
Storage Temperature
Operating Temperature Range
Lead Temperature Range
Junction Temperature
2
V
2
VOUT
RL
VOUT
RL
⎛
⎜
⎞
⎟
S
PD =
(VS ×IS
)
+
×
–
⎝
⎠
RMS output voltages should be considered. 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.
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.
2
VS/4
PD = VS ×IS +
( )
RL
In single-supply operation with RL referenced to −VS, worst case
is VOUT = VS/2.
THERMAL RESISTANCE
Airflow increases heat dissipation, effectively reducing θJA.
Also, more metal directly in contact with the package leads and
through holes under the device reduces θJA.
θJA is specified for the worst-case conditions, that is, θJA is
specified for device soldered in circuit board for surface-mount
packages.
Figure 5 shows the maximum safe power dissipation in the
package vs. the ambient temperature for the 6-lead SOT-23
(170°C/W), the 8-lead MSOP (150°C/W), and the 14-lead
TSSOP (120°C/W) on a JEDEC standard 4-layer board. θJA
values are approximations.
Table 5. Thermal Resistance
Package Type
6-lead SOT-23
14-lead TSSOP
8-lead MSOP
θJA
Unit
°C/W
°C/W
°C/W
170
120
150
2.0
Maximum Power Dissipation
TSSOP
The maximum safe power dissipation for the ADA4851-1/
ADA4851-2/ADA4851-4 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
amplifiers. 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.
1.5
MSOP
1.0
SOT-23-6
0.5
0
–55 –45 –35 –25 –15 –5
5
15 25 35 45 55 65 75 85 95 105 115 125
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the die
AMBIENT TEMPERATURE (°C)
Figure 5. Maximum Power Dissipation vs. Temperature for a 4-Layer Board
ESD 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 this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. C | Page 6 of 20
ADA4851-1/ADA4851-2/ADA4851-4
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, RF = 0 Ω for G = +1, RF = 1 kΩ for G > +1, RL = 1 kΩ, unless otherwise noted.
1
4
V
R
= ±5V
= 150Ω
= 0.1V p-p
S
10pF
G = +1
= 5V
L
V
3
S
0
V
OUT
R
V
= 1kΩ
L
= 0.1V p-p
2
OUT
G = –1
–1
–2
–3
–4
–5
1
0
5pF
0pF
–1
–2
–3
–4
–5
–6
G = +10
G = +2
–6
–7
1
10
FREQUENCY (MHz)
100
1
10
FREQUENCY (MHz)
100
300
Figure 6. Small Signal Frequency Response for Various Gains
Figure 9. Small Signal Frequency Response for Various Capacitor Loads
1
1
+125°C
R
= 150Ω
L
0
0
–1
–2
–3
–4
–5
–6
+85°C
V
= ±5V
S
–40°C
+25°C
V
= ±5V
S
–1
–2
–3
–4
–5
–6
G = +1
= 0.1V p-p
R
= 1kΩ
L
G = +1
V
V
OUT
= 0.1V p-p
OUT
1
10
FREQUENCY (MHz)
100
300
1
10
FREQUENCY (MHz)
100
300
Figure 10. Small Signal Frequency Response for Various Temperatures
Figure 7. Small Signal Frequency Response for Various Loads
2
1
V
R
V
= ±5V
= 150Ω
G = +1
S
V
= +5V
S
R
V
= 150Ω
L
L
1
0
0
–1
–2
–3
–4
–5
= 1V p-p
= 0.1V p-p
OUT
OUT
–1
–2
–3
–4
–5
–6
V
= ±5V
S
G = +2
G = +10
G = –1
–6
–7
1
10
FREQUENCY (MHz)
100
300
1
10
FREQUENCY (MHz)
100
Figure 8. Small Signal Frequency Response for Various Supplies
Figure 11. Large Signal Frequency Response for Various Gains
Rev. C | Page 7 of 20
ADA4851-1/ADA4851-2/ADA4851-4
6.2
–40
–50
V
= ±5V
S
G = –1
G = +2
R
R
V
= 3V
S
6.1
6.0
5.9
5.8
5.7
5.6
5.5
5.4
= 150Ω
= 1kΩ
L
F
R
= 150Ω
L
V
= 2V
OUT
HD2
–60
V
= 100mV p-p
OUT
–70
V
= 1V p-p
OUT
–80
V
= 2V p-p
OUT
HD3
–90
–100
–110
0.1
1
10
0.1
1
10
FREQUENCY (MHz)
100
FREQUENCY (MHz)
Figure 15. Harmonic Distortion vs. Frequency
Figure 12. 0.1 dB Flatness Response
–50
1
0
G = +2
= ±5V
V
= ±5V
S
V
G = +1
= 1V p-p
S
–60
–70
V
R
= 1kΩ
OUT
L
f = 2MHz
HD2
–1
–2
–3
–4
–5
–6
R
= 1kΩ
L
–80
HD3
R
= 150Ω
L
–90
–100
–110
–120
0
1
2
3
4
5
6
7
8
9
10
1
10
FREQUENCY (MHz)
100
300
OUTPUT AMPLITUDE (V p-p)
Figure 16. Harmonic Distortion vs. Output Voltage
Figure 13. Large Frequency Response for Various Loads
–40
–50
140
120
100
80
0
–30
G = +1
V
= ±5V
S
V
= 2V p-p
OUT
V
= ±5V
S
–60
–60
PHASE
R = 1kΩ HD2
L
–90
–70
60
–120
–150
–180
–210
–240
R
= 150Ω HD2
–80
L
40
GAIN
R
= 150Ω HD3
L
–90
20
R
= 1kΩ HD3
L
–100
–110
0
–20
10
100
1k
10k
100k
1M
10M
100M
1G
0.1
1
FREQUENCY (MHz)
10
FREQUENCY (Hz)
Figure 14. Open-Loop Gain and Phase vs. Frequency
Figure 17. Harmonic Distortion vs. Frequency for Various Loads
Rev. C | Page 8 of 20
ADA4851-1/ADA4851-2/ADA4851-4
–40
–50
0.075
0.050
0.025
0
2.575
G = +1 OR +2
L
G = +1
R
= 1kΩ
V
V
= 2V p-p
= 5V
OUT
2.550
2.525
2.500
2.475
2.450
2.425
S
–60
R
= 1kΩ HD2
L
–70
–80
R
= 150Ω HD2
L
R
= 150Ω HD3
–0.025
–0.050
–0.075
L
V
= ±5V
S
–90
V
= +5V
S
–100
–110
R
= 1kΩ HD3
L
0
50
100
150
200
0.1
1
10
TIME (ns)
FREQUENCY (MHz)
Figure 21. Small Signal Transient Response for Various Supplies
Figure 18. Harmonic Distortion vs. Frequency for Various Loads
2.575
6
10pF
0pF
G = +5
G = +1
= 5V
OUTPUT
5
4
V
R
= ±5V
= 150Ω
V
S
S
R
= 150Ω
L
L
2.550
2.525
2.500
2.475
2.450
2.425
f = 1MHz
5 × INPUT
3
2
1
0
–1
–2
–3
–4
–5
–6
0
20
40
60
80
100 120 140 160 180 200
TIME (ns)
0
100 200 300 400 500 600 700 800 900
TIME (ns)
1k
Figure 19. Output Overdrive Recovery
Figure 22. Small Signal Transient Response for Capacitive Load
6
5
1.5
3.0
G = +1
G = +2
L
V
R
= ±5V
= 150Ω
INPUT
S
R
= 150Ω
L
4
1.0
0.5
2.5
2.0
1.5
1.0
0.5
0
f = 1MHz
3
V
= ±5V
V
= +5V
S
S
OUTPUT
2
1
0
0
–1
–2
–3
–4
–5
–6
–0.5
–1.0
–1.5
0
100 200 300 400 500 600 700 800 900
TIME (ns)
1k
0
50
100
150
200
TIME (ns)
Figure 20. Input Overdrive Recovery
Figure 23. Large Signal Transient Response for Various Supplies
Rev. C | Page 9 of 20
ADA4851-1/ADA4851-2/ADA4851-4
6
5
1.5
3.0
2.5
2.0
1.5
1.0
0.5
0
G = +2
G = +1
L
V
= 5V
S
R
= 150Ω
f
= 400kHz
IN
1.0
0.5
V
= ±5V
V
= +5V
S
S
V
4
DISABLE
3
0
2
–0.5
–1.0
–1.5
1
0
V
OUT
–1
0
15
30
45
0
50
100
TIME (ns)
150
200
TIME (μs)
Figure 24. Large Signal Transient Response for Various Supplies
Figure 27. Enable/Disable Time
0.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
+V – V
S
OUT
0.4
0.3
0.2
0.1
0
V
= ±5V
S
V
= ±5V
V = +5V
S
V
= +3V
S
S
V
= +3V
S
–V – V
S
OUT
0
5
10
15
20
25
30
35
–5
–4
–3
–2
–1
0
1
2
3
4
5
LOAD CURRENT (mA)
DISABLE VOLTAGE (V)
Figure 25. Output Saturation Voltage vs. Load Current
Figure 28. ADA4851-1, Supply Current vs.
Pin Voltage
POWER DOWN
600
500
400
300
200
100
0
300
200
G = +2
V
R
= ±5V
= 1kΩ
S
L
25% TO 75% OF V
O
V
= +3V
S
100
NEGATIVE SLEW RATE
V
= ±5V
S
0
–100
–200
–300
–400
V
= +5V
S
POSITIVE SLEW RATE
0
1
2
3
4
5
6
7
8
9
10
–40 –25 –10
5
20
35
50
65
80
95 110 125
OUTPUT VOLTAGE STEP (V p-p)
TEMPERATURE (°C)
Figure 26. Slew Rate vs. Output Voltage
Figure 29. Input Offset Voltage vs. Temperature for Various Supplies
Rev. C | Page 10 of 20
ADA4851-1/ADA4851-2/ADA4851-4
2.2
2.0
1.8
1.6
1.4
1.2
1000
100
10
G = +1
I
+, V = ±5V
S
B
I
–, V = ±5V
S
B
I
+, V = +5V
S
B
I
–, V = +5V
S
B
1
10
–40 –25 –10
5
20
35
50
65
80
95 110 125
100
1k
10k
100k
1M
10M
100M
TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 30. Input Bias Current vs. Temperature for Various Supplies
Figure 33. Voltage Noise vs. Frequency
0.09
100
10
1
G = +2
V
= ±5V
S
0.08
0.07
0.06
0.05
0.04
+V – V
OUT
S
V
= +5V
S
+V – V
S
OUT
–V – V
OUT
S
–V – V
OUT
S
–40 –25 –10
5
20
35
50
65
80
95 110 125
10
100
1k
10k
100k
1M
10M
100M
TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 34. Current Noise vs. Frequency
Figure 31. Output Saturation vs. Temperature for Various Supplies
80
70
60
50
40
30
20
10
0
3.2
V
= ±5V
S
V
= ±5V
S
N = 420
x = –260μV
σ = 780μV
3.0
2.8
2.6
2.4
2.2
2.0
V
= +5V
S
V
= +3V
S
–4
–3
–2
–1
0
1
2
3
4
–40 –25 –10
5
20
35
50
65
80
95 110 125
V
(mV)
TEMPERATURE (°C)
OFFSET
Figure 32. Supply Current vs. Temperature for Various Supplies
Figure 35. Input Offset Voltage Distribution
Rev. C | Page 11 of 20
ADA4851-1/ADA4851-2/ADA4851-4
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–30
G = +2
V
= ±5V
S
V
= 5V
–40
–50
S
L
R
V
= 1kΩ
= 1V p-p
IN
DRIVE AMPS 1, 2, AND 4
LISTEN AMP 3
–60
–70
–80
–90
DRIVE AMP 1
LISTEN AMP 2
–100
–110
–120
0.1
1k
10k
100k
1M
10M
100M
1G
1
10
100
FREQUENCY (MHz)
FREQUENCY (Hz)
Figure 38. ADA4851-4, RTI Crosstalk vs. Frequency
Figure 36. Common-Mode Rejection Ratio (CMRR) vs. Frequency
0
0
G = +2
V
= ±5V
S
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
V
= 5V
S
R
V
= 1kΩ
= 1V p-p
L
IN
+PSR
–PSR
DRIVE AMP 1
LISTEN AMP 2
DRIVE AMP 2
LISTEN AMP 1
100
1k
10k
100k
1M
10M
100M
1G
0.1
1
10
100
FREQUENCY (Hz)
FREQUENCY (MHz)
Figure 37. Power Supply Rejection (PSR) vs. Frequency
Figure 39. ADA4851-2, RTI Crosstalk vs. Frequency
Rev. C | Page 12 of 20
ADA4851-1/ADA4851-2/ADA4851-4
CIRCUIT DESCRIPTION
440
460
480
500
520
540
560
580
600
The ADA4851-1, ADA4851-2, and ADA4851-4 feature a high
slew rate input stage that is a true single-supply topology,
capable of sensing signals at or below the minus supply rail. The
rail-to-rail output stage can pull within 60 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.
HEADROOM CONSIDERATIONS
These amplifiers are designed for use in low voltage systems.
To obtain optimum performance, it is useful to understand the
behavior of the amplifiers as input and output signals approach
the amplifiers’ headroom limits. The amplifiers’ input common-
mode voltage range extends from the negative supply voltage
(actually 200 mV below this), or from ground for single-supply
operation, to within 2.2 V of the positive supply voltage.
Therefore, at a gain of 3, the amplifiers can provide full rail-to-
rail output swing for supply voltages as low as 3.3 V and down
to 3 V for a gain of 4.
–6
–5
–4
–3
–2
–1
(V)
0
1
2
3
4
V
CM
Figure 40. VOS vs. Common-Mode Voltage, VS = 5 V
2
G = +1
R
V
= 1kΩ
= 5V
L
S
1
0
V
V
= 3.0V
= 3.1V
CM
CM
Exceeding the headroom limit is not a concern for any inverting
gain on any supply voltage, as long as the reference voltage at
the amplifier’s positive input lies within the amplifier’s input
common-mode range.
–1
–2
–3
–4
–5
–6
V
= 3.2V
= 3.3V
CM
V
CM
The input stage is the headroom limit for signals approaching
the positive rail. Figure 40 shows a typical offset voltage vs. the
input common-mode voltage for the ADA4851-1/ADA4851-2/
ADA4851-4 amplifiers on a ±5 V supply. Accurate dc
performance is maintained from approximately 200 mV below
the minus supply to within 2.2 V of the positive supply. For high
speed signals, however, there are other considerations. Figure 41
shows −3 dB bandwidth vs. dc input voltage for a unity-gain
follower. As the common-mode voltage gets within 2 V of
positive supply, the amplifier responds well but the bandwidth
begins to drop as the common-mode voltage approaches the
positive supply. This can manifest itself in increased distortion
or settling time. Higher frequency signals require more
headroom than the lower frequencies to maintain distortion
performance.
0.1
1
10
100
1000
FREQUENCY (MHz)
Figure 41. Unity-Gain Follower Bandwidth vs. Input Common-Mode
Rev. C | Page 13 of 20
ADA4851-1/ADA4851-2/ADA4851-4
Figure 42 illustrates how the rising edge settling time for the
amplifier is configured as a unity-gain follower, stretching out
as the top of a 1 V step input that approaches and exceeds the
specified input common-mode voltage limit.
The amplifiers 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 increases the current draw of the
devices.
For signals approaching the minus supply and inverting gain
and high positive gain configurations, the headroom limit is the
output stage. The ADA4851-1/ADA4851-2/ADA4851-4
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 the drive current that the output transistor is
required to supply due to the output transistor’s collector
resistance.
3.50
G = +1
R
V
= 1kΩ
= 5V
L
3.25
3.00
2.75
2.50
2.25
2.00
S
V
= 2.25V TO 3.25V
STEP
V
= 2.25V TO
STEP
3.5V, 4V, AND 5V
3.6
G = +1
R
V
= 1kΩ
= 5V
3.4
3.2
3.0
2.8
2.6
L
S
0
100 200 300 400 500 600 700 800 900
TIME (ns)
1k
V
= 2V TO 3V
STEP
Figure 43. Pulse Response of G = 1 Follower,
Input Step Overloading the Input Stage
V
= 2.1V TO 3.1V
STEP
V
V
V
= 2.2V TO 3.2V
= 2.3V TO 3.3V
= 2.4V TO 3.4V
STEP
STEP
STEP
2.4
2.2
2.0
1.8
Output
Output overload recovery is typically within 35 ns after the
amplifier’s input is brought to a nonoverloading value. Figure 44
shows output recovery transients for the amplifier configured in
an inverting gain of 1 recovering from a saturated output from
the top and bottom supplies to a point at midsupply.
0
10
20
30
40
50
60
70
80
90
100
TIME (ns)
Figure 42. Output Rising Edge for 1 V Step at Input Headroom Limits
7
G = –1
R
V
= 1kΩ
= 5V
6
5
4
3
2
V
= 5V TO 2.5V
L
S
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. Figure 16 illustrates this point by plotting the typical
distortion vs. the output amplitude.
OUT
V
= 0V TO 2.5V
OUT
INPUT
VOLTAGE
EDGES
1
0
OVERLOAD BEHAVIOR AND RECOVERY
Input
–1
–2
The specified input common-mode voltage of the ADA4851-1/
ADA4851-2/ADA4851-4 is 200 mV below the negative supply
to within 2.2 V of the positive supply. Exceeding the top limit
results in lower bandwidth and increased rise time, as seen in
Figure 41 and Figure 42. Pushing the input voltage of a unity-
gain follower to less than 2 V from the positive supply leads to
the behavior shown in Figure 43—an increasing amount of
output error as well as a much increased settling time. The
recovery time from input voltages 2.2 V or closer to the positive
supply is approximately 55 ns, which is limited by the settling
artifacts caused by transistors in the input stage coming out of
saturation.
0
10
20
30
40
50
60
70
80
90
100
TIME (ns)
Figure 44. Overload Recovery
Rev. C | Page 14 of 20
ADA4851-1/ADA4851-2/ADA4851-4
Table 6. Recommended Values
SINGLE-SUPPLY VIDEO AMPLIFIER
Supply
Voltage
(V)
Input
Range
(V)
The ADA4851 family of amplifiers is well-suited for portable
video applications. When operating in low voltage single-supply
applications, the input signal is limited by the input stage
headroom. For additional information, see the Headroom
Considerations section. Table 6 illustrates the effects of supply
voltage, input signal, various gains, and output signal swing for
the typical video amplifier shown in Figure 45.
RG
(kΩ)
RF
(kΩ)
Gain
(V/V)
V’
(V)
VOUT
(V)
3
3
5
0 to 0.8
0 to 0.8
0 to 2.8
1
1
1
1
2
3
2
1.6
2.4
4.9
0.8
1.2
2.45
0.499
1
R
F
C1
2.2μF
+V
S
+
P
D
C2
0.01μF
R
G
75Ω CABLE
V
75Ω
OUT
U1
V′
V
75Ω
IN
Figure 45. Video Amplifier
Rev. C | Page 15 of 20
ADA4851-1/ADA4851-2/ADA4851-4
OUTLINE DIMENSIONS
2.90 BSC
6
1
5
2
4
3
2.80 BSC
1.60 BSC
PIN 1
INDICATOR
0.95 BSC
1.90
BSC
1.30
1.15
0.90
1.45 MAX
0.22
0.08
10°
4°
0°
0.60
0.45
0.30
0.50
0.30
0.15 MAX
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-178-AB
Figure 46. 6-Lead Small Outline Transistor Package [SOT-23]
(RJ-6)
Dimensions shown in millimeters
5.10
5.00
4.90
14
8
7
4.50
4.40
4.30
6.40
BSC
1
PIN 1
0.65
BSC
1.05
1.00
0.80
0.20
0.09
1.20
MAX
0.75
0.60
0.45
8°
0°
0.15
0.05
0.30
0.19
SEATING
PLANE
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 47. 14-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-14)
Dimensions shown in millimeters
Rev. C | Page 16 of 20
ADA4851-1/ADA4851-2/ADA4851-4
3.00
BSC
8
1
5
4
4.90
BSC
3.00
BSC
PIN 1
0.65 BSC
1.10 MAX
0.15
0.00
0.80
0.60
0.40
8°
0°
0.38
0.22
0.23
0.08
COPLANARITY
0.10
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS MO-187-AA
Figure 48. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model
Temperature Range
−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
Package Description
Package Outline
RJ-6
RJ-6
RJ-6
RM-8
RM-8
RM-8
RU-14
RU-14
RU-14
Branding
HHB
HHB
HHB
HSB
ADA4851-1YRJZ-R21
ADA4851-1YRJZ-RL1
ADA4851-1YRJZ-RL71
ADA4851-2YRMZ1
ADA4851-2YRMZ-RL1
ADA4851-2YRMZ-RL71 −40°C to +125°C
ADA4851-4YRUZ1
6-Lead Small Outline Transistor Package (SOT-23)
6-Lead Small Outline Transistor Package (SOT-23)
6-Lead Small Outline Transistor Package (SOT-23)
8-Lead Mini Small Outline Package (MSOP)
8-Lead Mini Small Outline Package (MSOP)
8-Lead Mini Small Outline Package (MSOP)
14-Lead Thin Shrink Small Outline Package (TSSOP)
14-Lead Thin Shrink Small Outline Package (TSSOP)
14-Lead Thin Shrink Small Outline Package (TSSOP)
HSB
HSB
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
ADA4851-4YRUZ-RL1
ADA4851-4YRUZ-R71
1 Z = Pb-free part.
Rev. C | Page 17 of 20
ADA4851-1/ADA4851-2/ADA4851-4
NOTES
Rev. C | Page 18 of 20
ADA4851-1/ADA4851-2/ADA4851-4
NOTES
Rev. C | Page 19 of 20
ADA4851-1/ADA4851-2/ADA4851-4
NOTES
©2005 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05143–0−5/05(C)
Rev. C | Page 20 of 20
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