clc451 National Semiconductor Corporation, clc451 Datasheet

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clc451

Manufacturer Part Number
clc451
Description
Single Supply, Low-power, High Output, Programmable Buffer
Manufacturer
National Semiconductor Corporation
Datasheet
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
N
CLC451
Single Supply, Low-Power, High Output,
Programmable Buffer
General Description
The CLC451 is a low cost, high speed (85MHz) buffer that
features user-programmable gains of +2, +1, and -1V/V. It has a
new output stage that delivers high output drive current (100mA),
but consumes minimal quiescent supply current (1.5mA) from a
single 5V supply. Its current feedback architecture, fabricated in
an advanced complementary bipolar process, maintains consis-
tent performance over a programmable range of gains and wide
signal levels, and has a linear-phase response up to one half of
the -3dB frequency. The CLC451’s internal feedback network
provides an excellent gain accuracy of 0.3%
The CLC451 offers superior dynamic performance with a 85MHz
small-signal bandwidth, 260V/ s slew rate and 6.5ns rise/fall
times (2V
low quiescent power, high output current drive, and high-speed
performance make the CLC451 well suited for many battery-
powered personal communication/computing systems.
The ability to drive low-impedance, highly capacitive loads,
makes the CLC451 ideal for single ended cable applications. It
also drives low impedance loads with minimum distortion. The
CLC451 will drive a 100
harmonic distortion (A
load, and the same conditions, it produces only -55/-60dBc sec-
ond/third harmonic distortion. It is also optimized for driving high
currents into single-ended transformers and coils.
When driving the input of high-resolution A/D converters, the
CLC451 provides excellent -66/-75dBc second/third harmonic
distortion (A
settling time.
V
in
0.1 F
+5V
step
5k
0.1 F
5k
v
). The combination of the small SOT23-5 package,
= +2, V
2
3
1
4
out
v
= +2, V
1k
CLC451
= 2V
load with only -78/-65dBc second/third
1k
SOT23-5
pp
Pinout
out
, f = 1MHz, R
= 2V
6
8
7
5
+5V
pp
0.1 F
V
non-inv
, f = 1MHz). With a 25
V
6.8 F
0.1 F
+
V
EE
o
75
L
= 1k ) and fast
Coaxial Cable
Single Supply Cable Driver
+
10m of 75
Typical Application
-
1k
1k
V
V
75
CC
inv
V
o
Features
Applications
100mA output current
1.5mA supply current
85MHz bandwidth (A
-66/-75dBc HD2/HD3 (1MHz)
25ns settling to 0.05%
260V/ s slew rate
Stable for capacitive loads up to 1000pF
Single 5V to ±5V supplies
Available in Tiny SOT23-5 package
Coaxial cable driver
Twisted pair driver
Transformer/Coil Driver
High capacitive load driver
Video line driver
Portable/battery-powered applications
A/D driver
10
DIP & SOIC
9
8
7
6
5
4
3
2
1
Pinout
Maximum Output Voltage vs. R
10
Response After 10m of Cable
V
in
V
= 10MHz, 0.5V
R
EE
L
100
V
V
( )
CC
s
v
= +5V
= 5V
= +2)
pp
1k
20ns/div
http://www.national.com
L
1k
June 1999
1000

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clc451 Summary of contents

Page 1

... Single Supply, Low-Power, High Output, Programmable Buffer General Description The CLC451 is a low cost, high speed (85MHz) buffer that features user-programmable gains of +2, +1, and -1V/V. It has a new output stage that delivers high output drive current (100mA), but consumes minimal quiescent supply current (1.5mA) from a single 5V supply ...

Page 2

... Electrical Characteristics PARAMETERS CONDITIONS Ambient Temperature CLC451AJ FREQUENCY DOMAIN RESPONSE -3dB bandwidth -0.1dB bandwidth V o gain peaking <200MHz, V gain rolloff <30MHz, V linear phase deviation <30MHz, V TIME DOMAIN RESPONSE rise and fall time 2V step settling time to 0.05% 1V step overshoot ...

Page 3

... Model CLC451AJP CLC451AJE CLC451AJM5 CLC451ALC JA ° 155 C/W ° 175 C/W ° 210 C/W – 3 GUARANTEED MIN/MAX UNITS 0 to 70°C -40 to 85° MHz 42 40 MHz 13 13 MHz 0.9 1.0 dB ...

Page 4

Typical Performance (A Frequency Response 0. Gain Phase 10M 100M ...

Page 5

Typical Performance (A Closed Loop Output Resistance 100 10 1 0.1 0.01 10k 100k 1M 10M 100M Frequency (Hz) PSRR & CMRR 60 PSRR 50 CMRR 10k 100k 1M 10M 100M Frequency (Hz) ...

Page 6

Typical Performance (A Gain Flatness Frequency (MHz) 2nd Harmonic Distortion -30 10MHz -35 5MHz -40 -45 2MHz -50 -55 1MHz - ...

Page 7

... The CLC451 is a current feedback buffer built in an advanced complementary bipolar process. The CLC451 operates from a single 5V supply or dual ±5V supplies. Operating from a single 5V supply, the CLC451 has the following features: Gains of +1, -1, and 2V/V are achievable without external resistors Provides 100mA of output current while consuming only 7 ...

Page 8

... Figure 6: AC Coupled Dual Supply Operation cm The CLC451 operates on dual supplies as well as single supplies. The non-inverting and inverting configurations are shown in Figures 7, 8 and 6 0 Figure 7: Dual Supply +5V) ...

Page 9

... Driving Cables and Capacitive Loads When driving cables, double termination is used to prevent reflections. For capacitive load applications, a small series resistor at the output of the CLC451 will improve stability and settling performance. The Frequency Response vs. C and Recommended R L vs. C plots, in the typical performance section, give the ...

Page 10

... Application Circuits Single Supply Cable Driver The typical application shown on the front page shows the CLC451 driving 10m of 75 CLC451 is set for a gain of +2V/V to compensate for the divide-by-two voltage drop yield desired input impedance t ...

Page 11

... Twisted Pair Driver The high output current and low distortion, of the CLC451, make it well suited for driving transformers. Figure 13 illustrates a typical twisted pair driver utilizing the CLC451 and a transformer. The transformer provides the signal and its inversion for the twisted pair. ...

Page 12

... National’s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of National Semiconductor Corporation. As used herein: 1. Life support devices or systems are devices or systems which, a) are intended for surgical implant into the body support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user ...

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