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CLC5633IMX Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CLC5633IMX
Beschreibung Triple/ High Output/ Programmable Gain Buffer
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
CLC5633IMX Datasheet, Funktion
N
CLC5633
Triple, High Output, Programmable Gain Buffer
June 1999
General Description
The CLC5633 is a triple, low-cost, high-speed (130MHz) buffer
which features user-programmable gains of +2, +1, and -1V/V.
The CLC5633 also has a new output stage that delivers high
output drive current (130mA), but consumes minimal quiescent
supply current (3.0mA/ch) from a single 5V supply. Its current
feedback architecture, fabricated in an advanced complementary
bipolar process, maintains consistent performance over a wide
range of gains and signal levels, and has a linear-phase response
up to one half of the -3dB frequency.
The CLC5633 offers 0.1dB gain flatness to 20MHz and differen-
tial gain and phase errors of 0.03% and 0.06°. These features are
ideal for professional and consumer video applications.
The CLC5633 offers superior dynamic performance with a
130MHz small-signal bandwidth, 410V/µs slew rate and 5.0ns
rise/fall times (2Vstep). The combination of low quiescent power,
high output current drive, and high-speed performance make
the CLC5633 well suited for many battery-powered personal
communication/computing systems.
The ability to drive low-impedance, highly capacitive loads,
with minimum distortion makes the CLC5633 ideal for cable
applications. The CLC5633 will drive a 100load with only
-73/-92dBc second/third harmonic distortion (Av = +2, Vout =
2Vpp, f = 1MHz). With a 25load, and the same conditions, it
produces only -75/-75dBc second/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
CLC5633 provides excellent -92/-96dBc second/third harmonic
distortion (Av = +2, Vout = 2Vpp, f = 1MHz, RL = 1k) and fast
settling time.
Features
s 130mA output current
s 0.03%, 0.06° differential gain, phase
s 3.0mA/ch supply current
s 130MHz bandwidth (Av = +2)
s -92/-96dBc HD2/HD3 (1MHz)
s 20ns settling to 0.05%
s 410V/µs slew rate
s Stable for capacitive loads up to 1000pf
s Single 5V to ±5V supplies
Applications
s Video line driver
s Coaxial cable driver
s Twisted pair driver
s Transformer/coil driver
s High capacitive load driver
s Portable/battery-powered applications
s A/D driver
Maximum Output Voltage vs. RL
10
9
8
7 VCC = ±5V
6
5
4
3 Vs = +5V
2
1
10 100
RL ()
1000
Typical Application
Single Supply Cable Driver
+5V 1
6.8µF
+2
+5V
Vin 0.1µF 5k
0.1µF
3
4
5
5k
0.1µF
6
7
14
1k
1k13
12
1k- +
1k
11
10
+ - 1k
1k
9
8
CLC5633
Note: Channel 2 and 3 not shown.
10m of 75
75Coaxial Cable
Vo
0.1µF
75
Pinout
DIP & SOIC
NC 1
NC 2
NC 3
+Vs 4
+IN1 5
-IN1 6
OUT1 7
14
1k
1k13
12
1k- +
1k
11
10
+ - 1k
1k
9
8
OUT2
-IN2
+IN2
-Vs
+IN3
-IN3
OUT3
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
http://www.national.com






CLC5633IMX Datasheet, Funktion
±5V Typical Channel Matching Performance (Av = +2, RL = 100, VCC = ± 5V, unless specified)
Channel Matching
Channel 3
Channel 2
All Hostile Crosstalk
-30
-40
-50
Pulse Crosstalk
Active Output
Channel 1
Inactive Output
Channel 2
Channel 1
-60
-70
Inactive Output
Channel 3
1M 10M 100M
Frequency (Hz)
-80
1M
10M
Frequency (Hz)
100M
Time (10ns/div)
CLC5633 Operation
The CLC5633 is a current feedback buffer built in an
advanced complementary bipolar process. The
CLC5633 operates from a single 5V supply or dual ±5V
supplies. Operating from a single 5V supply, the
CLC5633 has the following features:
s Gains of +1, -1, and 2V/V are achievable without
external resistors
s Provides 100mA of output current while
consuming only 15mW of power
s Offers low -84/-95dBc 2nd and 3rd harmonic
distortion
s Provides BW > 90MHz and 1MHz distortion
< -70dBc at Vo = 2Vpp
The CLC5633 performance is further enhanced in ±5V
supply applications as indicated in the ±5V Electrical
Characteristics table and ±5V Typical Performance plots.
If gains other than +1, -1, or +2V/V are required, then the
CLC5602 can be used. The CLC5602 is a current feed-
back amplifier with near identical performance and allows
for external feedback and gain setting resistors.
Current Feedback Amplifiers
Some of the key features of current feedback technology are:
s Independence of AC bandwidth and voltage gain
s Inherently stable at unity gain
s Adjustable frequency response with feedback resistor
s High slew rate
s Fast settling
Current feedback operation can be described using a simple
equation. The voltage gain for a non-inverting or inverting
current feedback amplifier is approximated by Equation 1.
Vo
Vin
=
Av
1+ Rf
Z(jω)
where:
Equation 1
s Av is the closed loop DC voltage gain
s Rf is the feedback resistor
s Z(jω) is the CLC5633’s open loop
transimpedance gain
s Z(jω) is the loop gain
Rf
The denominator of Equation 1 is approximately equal to
1 at low frequencies. Near the -3dB corner frequency, the
interaction between Rf and Z(jω) dominates the circuit
performance. The value of the feedback resistor has a
large affect on the circuits performance. Increasing Rf
has the following affects:
s Decreases loop gain
s Decreases bandwidth
s Reduces gain peaking
s Lowers pulse response overshoot
s Affects frequency response phase linearity
CLC5633 Design Information
Closed Loop Gain Selection
The CLC5633 is a current feedback op amp with
Rf = Rg = 1kon chip (in the package). Select from
three closed loop gains without using any external gain or
feedback resistors. Implement gains of +2, +1,
and -1V/V by connecting pins 5 and 6 (or 9 and 10, or 12
and 13) as described in the chart below.
Gain
Input Connections
Av Non-Inverting (pins 5,10, & 12) Inverting (pins 6,9, & 13)
-1V/V
+1V/V
+2V/V
ground
input signal
input signal
input signal
NC (open)
ground
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CLC5633IMX pdf, datenblatt
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