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EL2450CS-T7 Schematic ( PDF Datasheet ) - Elantec Semiconductor

Teilenummer EL2450CS-T7
Beschreibung 125MHz Single Supply Dual/Quad Op Amps
Hersteller Elantec Semiconductor
Logo Elantec Semiconductor Logo 




Gesamt 17 Seiten
EL2450CS-T7 Datasheet, Funktion
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
Features
• Specified for +3V, +5V, or ±5V
applications
• Large input common mode range
0V < VCM < VS -1.2V
• Output swings to ground without
saturating
• -3dB bandwidth = 125MHz
• ± 0.1dB bandwidth = 30MHz
• Low supply current = 5mA (per
amplifier)
• Slew rate = 275V/µs
• Low offset voltage = 4mV max
• Output current = ±100mA
• High open loop gain = 80dB
• Differential gain = 0.05%
• Differential phase = 0.05°
Applications
• Video amplifiers
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High speed communications
• RGB printers, FAX, scanners
• Broadcast equipment
• Active filtering
Ordering Information
Part No
EL2250CN
EL2250CS
EL2250CS-T7
EL2250CS-T13
EL2450CN
EL2450CS
EL2450CS-T7
EL2450CS-T13
Package
8-Pin PDIP
8-Pin SO
8-Pin SO
8-Pin SO
14-Pin PDIP
14-Pin SO
14-Pin SO
14-Pin SO
Tape & Reel
-
-
7”
13”
-
-
7”
13”
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
MDP0031
MDP0027
MDP0027
MDP0027
General Description
The EL2250C/EL2450C are part of a family of the electronics indus-
tries fastest single supply op amps available. Prior single supply op
amps have generally been limited to bandwidths and slew rates to that
of the EL2250C/EL2450C. The 125MHz bandwidth, 275V/µs slew
rate, and 0.05%/0.05° differential gain/differential phase makes this
part ideal for single or dual supply video speed applications. With its
voltage feedback architecture, this amplifier can accept reactive feed-
back networks, allowing them to be used in analog filtering
applications. The inputs can sense signals below the bottom supply
rail and as high as 1.2V below the top rail. Connecting the load resistor
to ground and operating from a single supply, the outputs swing com-
pletely to ground without saturating. The outputs can also drive to
within 1.2V of the top rail. The EL2250C/EL2450C will output
±100mA and will operate with single supply voltages as low as 2.7V,
making them ideal for portable, low power applications.
The EL2250C/EL2450C are available in PDIP and SO packages in
industry standard pin outs. Both parts operate over the industrial tem-
perature range of -40°C to +85°C, and are part of a family of single
supply op amps. For single amplifier applications, see the
EL2150C/EL2157C. For dual and triple amplifiers with power down
and output voltage clamps, see the EL2257C/EL2357C.
Connection Diagrams
OUTA 1
8 VS+
INA- 2
-
+
A
7 OUTB
INA+ 3
6 INB-
GND 4
B
-
+
5 INB+
EL2250C
(8-Pin SO & 8-Pin PDIP)
OUTA 1
14 OUTD
INA- 2
INA+ 3
A D 13 IND-
-+ +-
12 IND+
VS+ 4
11 GND
INB+ 5
INB- 6
10 INC+
-+ +-
BC
9 INC-
OUTB 7
8 OUTC
EL2450C
(14-Pin SO & 14-Pin PDIP)
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.






EL2450CS-T7 Datasheet, Funktion
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
Large Signal Step Response, VS = +3V
Large Signal Step Response, VS = +5V
Large Signal Step Response, VS = +12V
Small Signal Step Response
Large Signal Step Response, VS = ±5V
Slew Rate vs Temperature
Settling Time vs Settling Accuracy
Voltage and Current Noise vs Frequency
6

6 Page









EL2450CS-T7 pdf, datenblatt
EL2250C, EL2450C
125MHz Single Supply Dual/Quad Op Amps
Figure 1.
conditions, or package type need to be modified for the
EL2250C/EL2450C to remain in the safe operating area.
The maximum power dissipation allowed in a package is
determined according to [1]:
PDMAX
=
T----J---M-----A----X-----–----T----A----M-----A----X--
θJA
where:
TJMAX = Maximum Junction Temperature
TAMAX = Maximum Ambient Temperature
θJA = Thermal Resistance of the Package
PDMAX = Maximum Power Dissipation in the Package.
The maximum power dissipation actually produced by
an IC is the total quiescent supply current times the total
power supply voltage, plus the power in the IC due to the
load, or [2]
Figure 2.
Short Circuit Current Limit
The EL2250C/EL2450C have internal short circuit pro-
tection circuitry that protect it in the event of its output
being shorted to either supply rail. This limit is set to
around 100mA nominally and reduces with increasing
junction temperature. It is intended to handle temporary
shorts. If an output is shorted indefinitely, the power dis-
sipation could easily increase such that the part will be
destroyed. Maximum reliability is maintained if the out-
put current never exceeds ±90mA. A heat sink may be
required to keep the junction temperature below abso-
lute maximum when an output is shorted indefinitely.
Power Dissipation
With the high output drive capability of the
EL2250C/EL2450C, it is possible to exceed the 150°C
Absolute Maximum junction temperature under certain
load current conditions. Therefore, it is important to cal-
culate the maximum junction temperature for the
application to determine if power-supply voltages, load
P DM A X
=
N
×
V
s
×
ISMAX
+
(VS
VOUT)
×
V-----RO----LU----T--
where:
N = Number of amplifiers
VS = Total Supply Voltage
ISMAX = Maximum Supply Current per amplifier
VOUT = Maximum Output Voltage of the Application
RL = Load Resistance tied to Ground
If we set the two PDMAX equations, [1] & [2], equal to
each other, and solve for VS, we can get a family of
curves for various loads and output voltages according
to [3]:
VS = --R--------L--------×----------(------T-------J----N-(M----I------SA×--------X-×-θ-------J-–R----A-----TL-------)A--------+-M--------V-A--------OX--------U-)----+T-----(---V----O----U----T----)
12

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