clc407 National Semiconductor Corporation, clc407 Datasheet

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clc407

Manufacturer Part Number
clc407
Description
Low-cost, Low-power Programmable Gain Buffer With Disable
Manufacturer
National Semiconductor Corporation
Datasheet

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Comlinear CLC407
Low-Cost, Low-Power
Programmable Gain Buffer with Disable
© 1996 National Semiconductor Corporation
Printed in the U.S.A.
N
General Description
The Comlinear CLC407 is a low-cost, high-speed (110MHz)
buffer which features user-programmable gains of +2, +1, and -1
V/V. This high-performance part has the added versatility of a
TTL-compatible disable which quickly switches the buffer off in
18ns and back on in 40ns. The CLC407’s high 60mA output
current, coupled with its ultra-low 35mW power consumption
makes it the ideal choice for demanding applications that are
sensitive to both power and cost.
Utilizing Comlinear’s proven architectures, this current feedback
amplifier surpasses the performance of alternate solutions with a
closed-loop design that produces new standards for buffers in
gain accuracy, input impedance, and input bias currents. The
CLC407’s internal feedback network provides an excellent gain
accuracy of 0.1%.
benefit from the CLC407’s 6M
exceptionally low 100nA input bias current.
With 0.1dB flatness to 30MHz and low differential gain and phase
errors, the CLC407 is very useful for professional video process-
ing and distribution. A 110MHz -3dB bandwidth coupled with a
350V/ s slew rate also make the CLC407 a perfect choice in
cost-sensitive applications such as video monitors, fax machines,
copiers, and CATV systems. Back-terminated video applications
will especially appreciate +2 gains which require no external gain
components reducing inventory costs and board space.
High source impedance applications will
Typical Application
NOTE: All necessary components are shown.
2:1 Mux Cable Driver
input impedance along with its
Features
Applications
Low-cost
High output current: 60mA
High input impedance: 6M
Gains of + 1, +2 with no external components
Low power: I
Ultra-fast enable/disable times
Very low input bias currents: 100nA
Excellent gain accuracy: 0.1%
High speed: 110MHz -3dB BW
Desktop video systems
Multiplexers
Video distribution
Flash A/D driver
High-speed switch/driver
High-source impedance applications
Peak detector circuits
Professional video processing
High resolution monitors
Frequency Response (A
DIP & SOIC
Pinout
cc
= 3.5mA
V
= +2V/V)
http://www.national.com
August 1996

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clc407 Summary of contents

Page 1

... With 0.1dB flatness to 30MHz and low differential gain and phase errors, the CLC407 is very useful for professional video process- ing and distribution. A 110MHz -3dB bandwidth coupled with a 350V/ s slew rate also make the CLC407 a perfect choice in cost-sensitive applications such as video monitors, fax machines, copiers, and CATV systems. Back-terminated video applications will especially appreciate +2 gains which require no external gain components reducing inventory costs and board space ...

Page 2

... CLC407 Electrical Characteristics PARAMETERS CONDITIONS Ambient Temperature CLC407AJ FREQUENCY DOMAIN RESPONSE -3dB bandwidth V out V out ±0.1dB bandwidth V out gain flatness V out peaking DC to 200MHz rolloff <30MHz linear phase deviation <20MHz differential gain NTSC, RL=150 NTSC, RL=150 (Note 2) differential phase NTSC, RL=150 ...

Page 3

... CLC407 Typical Performance Characteristics Frequency Response Gain Phase 100 Frequency (MHz) Frequency Response vs +1) out v V =0. =1V Gain = = Phase - -90 V =0.2V ...

Page 4

... Time (ns) Closed Loop Gain Selection The CLC407 is a current feedback op amp with 250 on chip (in the package). Select from f g three closed loop gains without using any external gain or feedback resistors. Implement gains of +2, +1, and -1V/V by connecting pins 2 and 3 as described in the chart below ...

Page 5

... I Tail CLC407 NOTE: Pins are external Figure 2 Figure 2 illustrates the internal enable/disable operation of the CLC407. When pin 8 is left floating or is tied and pulls tail current through cc 1 the CLC407 circuitry. When pin 8 is less than 0.8V above the supply mid-point, Q ...

Page 6

... IN Input R 50 407 Fig 3 (Right) N:1 Mux Cable Driver The CLC407 is capable of multiplexing several signals on a single analog output bus. The front page shows how a 2 multiplexer is implemented. An N:1 multiplexer is implement analogous fashion by using an N:1 decoder to enable/disable the appropriate number of CLC407’s. ...

Page 7

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Page 8

... 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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