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CLC5612IM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CLC5612IM
Beschreibung Dual/ High Output/ Programmable Gain Buffer
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
CLC5612IM Datasheet, Funktion
N
CLC5612
Dual, High Output, Programmable Gain Buffer
June 1999
General Description
The CLC5612 is a dual, low-cost, high-speed (90MHz) buffer
which features user-programmable gains of +2, +1, and
-1V/V. The CLC5612 also has a new output stage that delivers
high output drive current (130mA), but consumes minimal
quiescent supply current (1.5mA/ch) from a single 5V supply. Its
current feedback architecture, fabricated in an advanced comple-
mentary 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 CLC5612 offers 0.1dB gain flatness to 18MHz and differen-
tial gain and phase errors of 0.15% and 0.02°. These features are
ideal for professional and consumer video applications.
The CLC5612 offers superior dynamic performance with a
90MHz small-signal bandwidth, 290V/µs slew rate and 6.2ns
rise/fall times (2Vstep). The combination of low quiescent power,
high output current drive, and high-speed performance make
the CLC5612 well suited for many battery-powered personal
communication/computing systems.
The ability to drive low-impedance, highly capacitive loads,
makes the CLC5612 ideal for single ended cable applications.
It also drives low impedance loads with minimum distortion.
The CLC5612 will drive a 100load with only -74/-86dBc
second/third harmonic distortion (Av = +2, Vout = 2Vpp, f = 1MHz).
With a 25load, and the same conditions, it produces only -70/
-67dBc 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
CLC5612 provides excellent -87/-93dBc second/third harmonic
distortion (Av = +2, Vout = 2Vpp, f = 1MHz, RL = 1k) and fast
settling time.
Features
s 130mA output current
s 0.15%, 0.02° differential gain, phase
s 1.5mA/ch supply current
s 90MHz bandwidth (Av = +2)
s -87/-93dBc HD2/HD3 (1MHz)
s 17ns settling to 0.05%
s 290V/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
Differential Line Driver with Load Impedance Conversion
Vd/2
Vin
Rt
1
1k
2 1k-
+
8
7
3 1k1k6
45
CLC5612
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
Rm/2
Req
1:n
Rm/2
-Vd/2
Zo
UTP
Io
RL
+
Vo
-
Rt2
Note: Supplies and bypassing not shown.
OUT1
-IN1
+IN1
-VCC
Pinout
DIP & SOIC
1k
1k-
+
1k1k
+VCC
OUT2
-IN2
+IN2
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CLC5612IM Datasheet, Funktion
±5V Typical Channel Matching Performance (Av = +2, RL = 100, VCC = ± 5V, unless specified)
Channel Matching
Channel 2
Input Referred Crosstalk
-20
Vo = 1Vpp
-40
-60
Pulse Crosstalk
Active Output
Channel
Inactive Output
Channel
-80
Channel 1
-100
1M 10M 100M
Frequency (Hz)
-120
1M
10M
Frequency (Hz)
100M
Time (10ns/div)
CLC5612 Operation
The CLC5612 is a current feedback buffer built in an
advanced complementary bipolar process. The
CLC5612 operates from a single 5V supply or dual ±5V
supplies. Operating from a single 5V supply, the
CLC5612 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 7.5mW of power
s Offers low -79/-81dBc 2nd and 3rd harmonic
distortion
s Provides BW > 50MHz and 1MHz distortion
< -75dBc at Vo = 2Vpp
The CLC5612 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 CLC5612’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
CLC5612 Design Information
Closed Loop Gain Selection
The CLC5612 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 2 and 3 (or 5 and 6) as
described in the chart below.
Gain
Av
-1V/V
+1V/V
+2V/V
Input Connections
Non-Inverting (pins 3,5) Inverting (pins 2,6)
ground
input signal
input signal
input signal
NC (open)
ground
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CLC5612IM pdf, datenblatt
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