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PDF NCS2535 Data sheet ( Hoja de datos )
| Número de pieza | NCS2535 | |
| Descripción | Triple 1.0 GHz Current Feedback Op Amp | |
| Fabricantes | ON Semiconductor | |
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NCS2535
Product Preview
Triple 1.0 GHz Current
Feedback Op Amp with
Enable Feature
NCS2535 is a triple 1.0 GHz current feedback monolithic
operational amplifier featuring high slew rate and low differential gain
and phase error. The current feedback architecture allows for a
superior bandwidth and low power consumption. This device features
an enable pin.
Features
• −3.0 dB Small Signal BW (AV = +2.0, VO = 0.5 Vp−p) 1.0 GHz Typ
• Slew Rate 1500 V/ms
• Supply Current 8.5 mA
• Input Referred Voltage Noise 6.0 nV/ǸHz
• THD −60 dBc (f = 5.0 MHz, VO = 2.0 Vp−p)
• Output Current 150 mA
• Enable Pin Available
• These are Pb−Free Devices*
Applications
• High Resolution Video
• Line Driver
• High−Speed Instrumentation
• Wide Dynamic Range IF Amp
3
Gain = +2
2 VS = ±5V
1 RF = 400W
RL = 150W
0
−1
−2
VOUT = 2.0V
−3
−4
−5
−6
0.01
VOUT = 1.0V
VOUT = 0.5V
0.1 1 10 100 1000
FREQUENCY (MHz)
Figure 1. Frequency Response:
Gain (dB) vs. Frequency
Av = +2.0
10k
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MARKING
DIAGRAM
16
TSSOP−16
NCS
DT SUFFIX
2535
CASE 948F
ALYW
1
2535 = NCS2535
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
TSSOP−16 PINOUT
−IN1
+IN1
VEE1
−IN2
+IN2
VEE2
−IN3
+IN3
1
2
3
4
5
6
7
8
−
+
−
+
−
+
16 EN1
15 OUT1
14 VCC1
13 EN2
12 OUT2
11 VCC2
10 OUT3
9 EN3
(Top View)
ORDERING INFORMATION
Device
Package
Shipping†
NCS2535DTG
TSSOP−16 96 Units/Rail
NCS2535DTR2G TSSOP−16 2500 Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
*For additional information on our Pb−Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting
Techniques Reference Manual, SOLDERRM/D.
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
© Semiconductor Components Industries, LLC, 2005
July, 2005 − Rev. P0
1
Publication Order Number:
NCS2535/D
1 page  
NCS2535
DC ELECTRICAL CHARACTERISTICS (VCC = +5.0 V, VEE = −5.0 V, TA = −40°C to +85°C, RL = 100 W to GND, RF = 1.2 kW,
AV = +2.0, Enable is left open, unless otherwise specified).
Symbol
Characteristic
Conditions
Min Typ Max Unit
DC PERFORMANCE
VIO Input Offset Voltage
DVIO/DT
Input Offset Voltage
Temperature Coefficient
IIB Input Bias Current
DIIB/DT
VIH
Input Bias Current
Temperature Coefficient
Input High Voltage (Enable)
(Note 4)
+Input (Non−Inverting), VO = 0 V
−Input (Inverting), VO = 0 V (Note 4)
+Input (Non−Inverting), VO = 0 V
−Input (Inverting), VO = 0 V
2.5
0
6.0
"3.0
"6.0
+40
−10
"5.0
mV
mV/°C
mA
nA/°C
V
VIL Input Low Voltage (Enable)
(Note 4)
−2.5
V
INPUT CHARACTERISTICS
VCM
Input Common Mode Voltage
Range
"3.0
V
CMRR
RIN
CIN
Common Mode Rejection
Ratio
Input Resistance
Differential Input
Capacitance
(See Graph)
+Input (Non−Inverting)
−Input (Inverting)
55 dB
100 MW
50 W
1.0 pF
OUTPUT CHARACTERISTICS
ROUT
VO
Output Resistance
Output Voltage Range
IO Output Current
POWER SUPPLY
VS Operating Voltage Supply
Range
"90
0.1
"3.0
"120
10
W
V
mA
V
IS,ON
Power Supply Current −
Enabled per amplifier
VO = 0 V
8.5 mA
IS,OFF
Power Supply Current −
Disabled per amplifier
VO = 0 V
Crosstalk
Channel to Channel, f = 5.0 MHz
PSRR
Power Supply Rejection
Ratio
(See Graph)
4. Guaranteed by design and/or characterization.
0.11
60
40
mA
dB
dB
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5
5 Page 
NCS2535
General Design Considerations
The current feedback amplifier is optimized for use in
high performance video and data acquisition systems. For
current feedback architecture, its closed−loop bandwidth
depends on the value of the feedback resistor. The
closed−loop bandwidth is not a strong function of gain, as is
for a voltage feedback amplifier, as shown in Figure 20.
10
RF = 300 W
5
RF = 400 W
0 RF = 500 W
RF = 600 W
−5
−10
AV = +2
−15 VCC = +5 V
VEE = −5 V
−20
0.1
1.0 10 100 1000
FREQUENCY (MHz)
Figure 20. Frequency Response vs. RF
10000
The −3.0 dB bandwidth is, to some extent, dependent on
the power supply voltages. By using lower power supplies,
the bandwidth is reduced, because the internal capacitance
increases. Smaller values of feedback resistor can be used at
lower supply voltages, to compensate for this affect.
Feedback and Gain Resistor Selection for Optimum
Frequency Response
A current feedback operational amplifier’s key advantage
is the ability to maintain optimum frequency response
independent of gain by using appropriate values for the
feedback resistor. To obtain a very flat gain response, the
feedback resistor tolerance should be considered as well.
Resistor tolerance of 1% should be used for optimum
flatness. Normally, lowering RF resistor from its
recommended value will peak the frequency response and
extend the bandwidth while increasing the value of RF
resistor will cause the frequency response to roll off faster.
Reducing the value of RF resistor too far below its
recommended value will cause overshoot, ringing, and
eventually oscillation.
Since each application is slightly different, it is worth
some experimentation to find the optimal RF for a given
circuit. A value of the feedback resistor that produces
X0.1 dB of peaking is the best compromise between
stability and maximal bandwidth. It is not recommended to
use a current feedback amplifier with the output shorted
directly to the inverting input.
Printed Circuit Board Layout Techniques
Proper high speed PCB design rules should be used for all
wideband amplifiers as the PCB parasitics can affect the
overall performance. Most important are stray capacitances
at the output and inverting input nodes as it can effect
peaking and bandwidth. A space (3/16″ is plenty) should be
left around the signal lines to minimize coupling. Also,
signal lines connecting the feedback and gain resistors
should be short enough so that their associated inductance
does not cause high frequency gain errors. Line lengths less
than 1/4″ are recommended.
Video Performance
This device designed to provide good performance with
NTSC, PAL, and HDTV video signals. Best performance is
obtained with back terminated loads as performance is
degraded as the load is increased. The back termination
reduces reflections from the transmission line and
effectively masks transmission line and other parasitic
capacitances from the amplifier output stage.
ESD Protection
All device pins have limited ESD protection using internal
diodes to power supplies as specified in the attributes table
(see Figure 21). These diodes provide moderate protection
to input overdrive voltages above the supplies. The ESD
diodes can support high input currents with current limiting
series resistors. Keep these resistor values as low as possible
since high values degrade both noise performance and
frequency response. Under closed−loop operation, the ESD
diodes have no effect on circuit performance. However,
under certain conditions the ESD diodes will be evident. If
the device is driven into a slewing condition, the ESD diodes
will clamp large differential voltages until the feedback loop
restores closed−loop operation. Also, if the device is
powered down and a large input signal is applied, the ESD
diodes will conduct.
NOTE: Human Body Model for +IN and –IN pins are
rated at 0.8kV while all other pins are rated at
2.0kV.
VCC
External
Pin
Internal
Circuitry
VEE
Figure 21. Internal ESD Protection
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NCS2535.PDF ] | |
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