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PDF ADA4859-3 Data sheet ( Hoja de datos )
| Número de pieza | ADA4859-3 | |
| Descripción | Video Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
Single-Supply, Fixed G = 2, High Speed,
Video Amplifier with Charge Pump
ADA4859-3
FEATURES
Integrated charge pump
Supply range: 3 V to 5.5 V
Output range: −3.3 V to −1.8 V
50 mA maximum output current at −3 V for external use
High speed amplifiers
−3 dB bandwidth: 195 MHz
Slew rate: 740 V/µs
0.1 dB gain flatness: 60 MHz
0.1% settling time: 20 ns
Low power
Total quiescent current: 38 mA
Power-down feature
High input common-mode voltage range
−1.8 V to +3.8 V at +5 V supply
Current feedback architecture
Differential gain error: 0.01%
Differential phase error: 0.02°
Available in 16-lead LFCSP
APPLICATIONS
Professional video
Consumer video
Imaging
Active filters
CONNECTION DIAGRAM
ADA4859-3
16 15 14 13
+VS 1
C1_a 2
C1_b 3
CPO 4
CHARGE
PUMP
12 +IN2
11 –IN2
10 OUT2
9 PD
5 67 8
NOTES
1. NC = NO CONNECT.
2. EXPOSED PAD, CONNECT TO GROUND.
Figure 1.
GENERAL DESCRIPTION
The ADA4859-3 (triple) is a single-supply, high speed current
feedback amplifier with an integrated charge pump that eliminates
the need for negative supplies in order to output negative voltages
or output a 0 V level for video applications. The 195 MHz, large
signal −3 dB bandwidth at a fixed gain of 2, as well as the 740 V/µs
slew rate, make this amplifier ideal for high resolution professional
and consumer video applications. The amplifier also has a wide
input common-mode voltage range that extends from 1.8 V
below ground to 1.2 V below the positive rail at 5 V supply.
This triple video amplifier is designed to operate on supply
voltages of 3.3 V to 5 V, using only 38 mA total quiescent
current, including the charge pump. To further reduce the
power consumption, it is equipped with a power-down feature
that lowers the total supply current to as low as 2 mA when the
amplifier is not being used. Even in power-down mode, the
charge pump can be used to power external components. The
maximum output current for external use is 50 mA at −3 V.
The ADA4859-3 is available in a 16-lead LFCSP, and it is designed
to work over the industrial temperature range of −40°C to +105°C.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADA4859-3
TA = 25°C, VS = 3.3 V, G = 2, RF = 550 Ω, RL = 150 Ω, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time to 0.1%
NOISE/DISTORTION PERFORMANCE
Total Harmonic Distortion
Crosstalk
Total Output Noise
Input Current Noise
Differential Gain Error
Differential Phase Error
DC PERFORMANCE
Output Offset Voltage
+Input Bias Current
Closed-Loop Gain
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Overdrive Recovery Time
Maximum Linear Output Current @ VO = 1 VPEAK
POWER-DOWN
Input Voltage
Bias Current
Turn-On Time
Turn-Off Time
POWER SUPPLY
Operating Range
Total Quiescent Current
Amplifier
Charge Pump
Total Quiescent Current When Powered Down
Amplifier
Charge Pump
Positive Power Supply Rejection Ratio
Negative Power Supply Rejection Ratio
Charge Pump Output Voltage
Charge Pump Sink Current
Conditions
VOUT = 0.1 V p-p
VOUT = 2 V p-p
VOUT = 2 V p-p, CL = 6 pF
VOUT = 2 V step, RL = 150 Ω
VOUT = 2 V step
fC = 1 MHz, VO = 2 V p-p
fC = 5 MHz, VO = 2 V p-p
f = 5 MHz
f = 1 MHz
f = 1 MHz
+IN
+IN
Rise/fall, f = 5 MHz
fC = 1 MHz, HD2 ≤ −50 dBc
Enabled
Powered down
Referred to output
Referred to output
Data Sheet
Min Typ Max Unit
260 MHz
165 MHz
65 MHz
530 V/µs
20 ns
−84/−86
−73/−77
−80
17
2
0.02
0.03
dBc
dBc
dBc
nV/√Hz
pA/√Hz
%
Degrees
−25 +9 +25 mV
−2 +0.7 +2 µA
1.9 2 2.1 V/V
15 MΩ
1.5 pF
−0.9 +2.2 V
−0.7 to +2.1
−1 to +2.3
15
18
V
ns
mA
1.25 V
1.35 V
−0.1 +0.1 µA
0.5 µs
2 µs
3 5.5 V
14 17 20 mA
19 mA
0.15 0.25 0.3 mA
2 mA
−54 −50 dB
−50 −47 dB
−2.1 −2 −1.8 V
45 mA
Rev. A | Page 4 of 16
5 Page 
ADA4859-3
5 2.5
VIN
4 2.0
3 1.5
2 1.0
1 0.5
00
–1
VOUT
–2
–0.5
–1.0
–3 –1.5
TIME (20ns/DIV)
Figure 22. Output Overdrive Recovery
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
–2.0
–5
0
OUTPUT
INPUT
ERROR
5 10 15 20 25 30
TIME (ns)
Figure 23. Settling Time (Rise)
35
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
40
0 24
–0.4
CHARGE
PUMP CURRENT
–0.8
22
20
–1.2 18
–1.6 16
AMPLIFIER
CURRENT
–2.0
14
–2.4 12
OUTPUT
–2.8 VOLTAGE 10
–3.2 8
2.5 3.0 3.5 4.0 4.5 5.0
CHARGE PUMP SUPPLY VOLTAGE (V)
Figure 24. Charge Pump Voltage and Current vs. Supply Voltage
Data Sheet
3.0
VS = 3.3V
2.5
VIN
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
VOUT
–2.0
TIME (20ns/DIV)
Figure 25. Output Overdrive Recovery
1.5
1.0
0.5
0
–0.5
–1.0
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
–2.0
–5
0
0.5
0.4
0.3
ERROR
0.2
0.1
0
–0.1
INPUT
–0.2
OUTPUT
–0.3
–0.4
–0.5
5 10 15 20 25 30 35 40
TIME (ns)
Figure 26. Settling Time, (Fall)
1.5
VPD
1.0
0.5
0
–0.5
–1.0
–1.5
VOUT
TIME (400ns/DIV)
Figure 27. Enable/Power-Down Time
6
5
4
3
2
1
0
Rev. A | Page 10 of 16
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ADA4859-3.PDF ] | |
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