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ADA4891-4 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4891-4
Beschreibung Rail-to-Rail Amplifiers
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 24 Seiten
ADA4891-4 Datasheet, Funktion
Low Cost CMOS, High Speed,www.DataSheet4U.com
Rail-to-Rail Amplifiers
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
FEATURES
High speed and fast settling
−3 dB bandwidth: 220 MHz (G = +1)
Slew rate: 170 V/μs
Settling time to 0.1%: 28 ns
Video specifications (G = +2, RL = 150 Ω)
0.1 dB gain flatness: 25 MHz
Differential gain error: 0.05%
Differential phase error: 0.25°
Single-supply operation
Wide supply range: 2.7 V to 5.5 V
Output swings to within 50 mV of supply rails
Low distortion: 79 dBc SFDR at 1 MHz
Linear output current: 125 mA at −40 dBc
Low power: 4.4 mA per amplifier
APPLICATIONS
Imaging
Consumer video
Active filters
Coaxial cable drivers
Clock buffers
Photodiode preamp
Contact image sensor and buffers
GENERAL DESCRIPTION
The ADA4891-1 (single), ADA4891-2 (dual), ADA4891-3 (triple),
and ADA4891-4 (quad) are CMOS, high speed amplifiers that
offer high performance at a low cost. The amplifiers feature true
single-supply capability, with an input voltage range that extends
300 mV below the negative rail.
In spite of their low cost, the ADA4891 family provides high
performance and versatility. The rail-to-rail output stage enables
the output to swing to within 50 mV of each rail, enabling maxi-
mum dynamic range.
The ADA4891 family of amplifiers is ideal for imaging applica-
tions, such as consumer video, CCD buffers, and contact image
sensor and buffers. Low distortion and fast settling time also
make them ideal for active filter applications.
The ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 are avail-
able in a wide variety of packages. The ADA4891-1 is available
in 8-lead SOIC and 5-lead SOT-23 packages. The ADA4891-2
is available in 8-lead SOIC and 8-lead MSOP packages. The
ADA4891-3 and ADA4891-4 are available in 14-lead SOIC and
14-lead TSSOP packages. The amplifiers are specified to operate
over the extended temperature range of −40°C to +125°C.
CONNECTION DIAGRAMS
ADA4891-1
NC 1
–IN 2
+IN 3
–VS 4
8 NC
7 +VS
6 OUT
5 NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC_N (R-8)
ADA4891-1
OUT 1
–VS 2
+IN 3
5 +VS
4 –IN
Figure 2. 5-Lead SOT-23 (RJ-5)
ADA4891-2
OUT1 1
–IN1 2
+IN1 3
–VS 4
8 +VS
7 OUT2
6 –IN2
5 +IN2
NC = NO CONNECT
Figure 3. 8-Lead SOIC_N (R-8) and 8-Lead MSOP (RM-8)
ADA4891-3
PD1 1
14 OUT2
PD2 2
13 –IN2
PD3 3
+VS 4
+IN1 5
12 +IN2
11 –VS
10 +IN3
–IN1 6
9 –IN3
OUT1 7
8 OUT3
Figure 4. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
ADA4891-4
OUT1 1
–IN1 2
+IN1 3
+VS 4
+IN2 5
–IN2 6
OUT2 7
14 OUT4
13 –IN4
12 +IN4
11 –VS
10 +IN3
9 –IN3
8 OUT3
Figure 5. 14-Lead SOIC_N (R-14) and 14-Lead TSSOP (RU-14)
Rev. B
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
©2010 Analog Devices, Inc. All rights reserved.






ADA4891-4 Datasheet, Funktion
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Input Voltage (Common Mode)
Differential Input Voltage
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10 sec)
Rating
6V
−VS − 0.5 V to +VS
±VS
−65°C to +125°C
−40°C to +125°C
300°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.
MAXIMUM POWER DISSIPATION
The maximum power that can be safely dissipated by the
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4 is limited
by the associated rise in junction temperature. The maximum
safe junction temperature for plastic encapsulated devices is
determined by the glass transition temperature of the plastic,
approximately 150°C. Temporarily exceeding this limit can
cause a shift in parametric performance due to a change in the
stresses exerted on the die by the package. Exceeding a junction
temperature of 175°C for an extended period can result in
device failure.
The still-air thermal properties of the package (θJA), the ambient
temperature (TA), and the total power dissipated in the package
(PD) can be used to determine the junction temperature of the die.
The junction temperature can be calculated as
TJ = TA + (PD × θJA)
(1)
The power dissipated in the package (PD) is the sum of the
quiescent power dissipation and the power dissipated in the
package due to the load drive for all outputs. It can be calculated by
PD = (VT × IS) + (VS VOUT) × (VOUT/RL)
(2)
where:
VT is the total supply rail.
IS is the quiescent current.
VS is the positive supply rail.
VOUT is the output of the amplifier.
RL is the output load of the amplifier.
To ensure proper operation, it is necessary to observe the maxi-
mum power derating curves shown in Figure 6. These curves
are derived by setting TJ = 150°C in Equation 1. Figure 6 shows
the maximum safe power dissipation in the package vs. the
ambient temperature on a JEDEC standard 4-layer board.
2.0
TJ = 150°C
14-LEAD TSSOP
1.5
8-LEAD SOIC_N
1.0
8-LEAD MSOP
5-LEAD SOT-23
0.5
14-LEAD SOIC_N
0
–55 –35 –15 5 25 45 65 85 105 125
AMBIENT TEMPERATURE (°C)
Figure 6. Maximum Power Dissipation vs. Ambient Temperature
Table 4 lists the thermal resistance (θJA) for each ADA4891-1/
ADA4891-2/ADA4891-3/ADA4891-4 package.
Table 4.
Package Type
5-Lead SOT-23
8-Lead SOIC_N
8-Lead MSOP
14-Lead SOIC_N
14-Lead TSSOP
θJA Unit
146 °C/W
115 °C/W
133 °C/W
162 °C/W
108 °C/W
ESD CAUTION
Rev. B | Page 6 of 24

6 Page









ADA4891-4 pdf, datenblatt
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
www.DataSheet4U.com
0.30
0.20
0.10
VGS==+52V
RVOL U=T1=502V p-p
0
–0.10
–0.20
–0.30
0
25 30 35 40
TIME (ns)
Figure 37. Short-Term Settling Time to 0.1%
45
200
VS = 5V
G = +2
190 RL = 150
180
FALLING EDGE
170
160
RISING EDGE
150
140
1.0
1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT STEP (V)
Figure 40. Slew Rate vs. Output Step
4.5
5.0
3
INPUT
2 OUTPUT
VGS==+±12.5V
RL = 1k
1
0
1V/DIV
–1
5ns/DIV
Figure 38. Input Overdrive Recovery from Positive Rail
1
VGS==+±12.5V
RL = 1k
0
INPUT
–1
OUTPUT
–2
1V/DIV
–3
5ns/DIV
Figure 41. Input Overdrive Recovery from Negative Rail
3
OUTPUT
2
VGS==–±22.5V
RL = 1k
1
INPUT
0
–1
–2
1V/DIV
–3
5ns/DIV
Figure 39. Output Overdrive Recovery from Positive Rail
3
INPUT
2
VGS==–±22.5V
RL = 1k
1
0
–1
–2 OUTPUT
1V/DIV
–3
5ns/DIV
Figure 42. Output Overdrive Recovery from Negative Rail
Rev. B | Page 12 of 24

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