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PDF ADA4850-2 Data sheet ( Hoja de datos )
| Número de pieza | ADA4850-2 | |
| Descripción | (ADA4850-1/-2) Op Amp | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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High Speed, Rail-to-Rail Output,
Op Amp with Ultralow Power-Down
ADA4850-1/ADA4850-2
FEATURES
Ultralow power-down current: 150 nA/amp max
Low quiescent current: 2.4 mA/amp
High speed
175 MHz −3 dB bandwidth
220 V/µs slew rate
85 ns settling time to 0.1%
Excellent video specifications
0.1 dB flatness: 14 MHz
Differential gain: 0.12%
Differential phase: 0.09°
Single-supply operation: 2.7 V to 6 V
Rail-to-rail output
Output swings to within 80 mV of either rail
Low voltage offset: 0.6 mV
APPLICATIONS
Portable multimedia players
Video cameras
Digital still cameras
Consumer video
GENERAL DESCRIPTION
The ADA4850-1, ADA4850-21 are low price, high speed,
voltage feedback 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 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.
The ADA4850 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.
With its combination of low price, excellent differential gain
(0.12%), differential phase (0.09º), and 0.1 dB flatness out to
14 MHz, these amplifiers are ideal for video applications.
Rev. A
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.
PIN CONFIGURATIONS
POWER DOWN 1
NC 2
–IN 3
+IN 4
ADA4850-1
8 +VS
7 OUTPUT
6 NC
5 –VS
NC = NO CONNECT
Figure 1. 8-Lead, 3 mm × 3 mm LFCSP
VOUT1 1
–IN1 2
+IN1 3
–VS 4
ADA4850-2
12 +VS
11 VOUT2
10 –IN2
9 +IN2
NC = NO CONNECT
Figure 2. 16-Lead, 3 mm × 3 mm LFCSPP
The ADA4850-1/ADA4850-2 are designed to work in the
extended temperature range of −40°C to +125°C.
2
1
0
–1
–2
–3
–4
G = +1
–5
VS = 5V
RL = 1kΩ
VOUT = 0.1V p-p
–6
1
10
100
FREQUENCY (MHz)
Figure 3. Small Signal Frequency Response
1000
1 Patent pending.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.
1 page  
ADA4850-1/ADA4850-2
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Power Dissipation
Power Down Pin Voltage
Common-Mode Input Voltage
Differential Input Voltage
Storage Temperature
Operating Temperature Range
Lead Temperature Range
(Soldering 10 sec)
Junction Temperature
Rating
12.6 V
See Figure 4
(−VS + 6) V
(−VS − 0.5 ) V to (+VS + 0.5) V
+VS to −VS
−65°C to +125°C
−40°C to +125°C
300°C
150°C
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.
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.
Table 4. Thermal Resistance
Package Type
16-Lead LFCSP
8-Lead LFCSP
θJA
91
80
Unit
°C/W
°C/W
Maximum Power Dissipation
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.
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).
PD = Quiescent Power + (Total Drive Power − Load Power)
( )PD =
VS × IS
+
⎜⎜⎝⎛
VS
2
× VOUT
RL
⎟⎟⎠⎞ –
VOUT 2
RL
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.
PD
=
(VS
×
IS
)+
(VS/4)2
RL
In single-supply operation with RL referenced to −VS, the worst
case is VOUT = VS/2.
Airflow increases heat dissipation, effectively reducing θJA.
Also, more metal directly in contact with the package leads and
exposed paddle from metal traces, through holes, ground, and
power planes reduce θJA.
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.
2.5
2.0
LFCSP-16
1.5
LFCSP-8
1.0
0.5
0
–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
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. A | Page 5 of 16
5 Page 
0
VS = 5V
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
100
1k
+PSR
–PSR
10k 100k 1M
FREQUENCY (Hz)
10M 100M
Figure 35. Power Supply Rejection (PSR) vs. Frequency
0.7
0.6
0.5
VS = 5V
0.4
0.3
VS = 3V
0.2
0.1
0
–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
ADA4850-1/ADA4850-2
–20
VS = 5V
–30
–40
–50
CHANNEL 1
–60
–70 CHANNEL 2
–80
–90
–100
–110
–120
1k
10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 37. Common-Mode Rejection Ratio (CMRR) vs. Frequency
Rev. A | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADA4850-2.PDF ] | |
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