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Número de pieza | CLC452 | |
Descripción | Single Supply/ Low-Power/ High Output/ Current Feedback Amplifier | |
Fabricantes | National Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de CLC452 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
No Preview Available ! June 1999
N
CLC452
Single Supply, Low-Power, High Output,
Current Feedback Amplifier
General Description
The CLC452 has a new output stage that delivers high output
drive current (100mA), but consumes minimal quiescent supply
current (3.0mA) 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 CLC452 offers superior dynamic performance with a
130MHz small-signal bandwidth, 400V/µs slew rate and 4.5ns
rise/fall times (2Vstep). The combination of low quiescent power,
high output current drive, and high-speed performance make
the CLC452 well suited for many battery-powered personal
communication/computing systems.
The ability to drive low-impedance, highly capacitive loads,
makes the CLC452 ideal for single ended cable applications. It
also drives low impedance loads with minimum distortion. The
CLC452 will drive a 100Ω load with only -75/-74dBc second/third
harmonic distortion (Av = +2, Vout = 2Vpp, f = 1MHz). With a 25Ω
load, and the same conditions, it produces only -65/-77dBc 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
CLC452 provides excellent -78/-85dBc second/third harmonic
distortion (Av = +2, Vout = 2Vpp, f = 1MHz, RL = 1kΩ) and fast
settling time.
Available in SOT23-5, the CLC452 is ideal for applications where
space is critical.
Features
s 100mA output current
s 3.0mA supply current
s 130MHz bandwidth (Av = +2)
s -78/-85dBc HD2/HD3 (1MHz)
s 25ns settling to 0.05%
s 400V/µs slew rate
s Stable for capacitive loads up to 1000pF
s Single 5V to ±5V supplies
s Available in Tiny SOT23-5 package
Applications
s Coaxial cable driver
s Twisted pair driver
s Transformer/Coil Driver
s High capacitive load driver
s Video line 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 (Ω)
1000
+5V
6.8µF
+
Typical Application
Single Supply Cable Driver
Response After 10m of Cable
Vin = 10MHz, 0.5Vpp
5kΩ
Vin 0.1µF
5kΩ
3 + 7 0.1µF
CLC452 6
75Ω
2-
4 1kΩ
0.1µF
10m of 75Ω
Coaxial Cable
Vo
75Ω
1kΩ
0.1µF
Vo
Pinout
SOT23-5
VEE
VCC
Pinout
DIP & SOIC
20ns/div
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
Vnon-inv
Vinv
VEE
http://www.national.com
1 page +5V Typical Performance (Av = +2, Rf = 1kΩ, RL = 100Ω, Vs = + 5V1, Vcm = VEE + (Vs/2), RL tied to Vcm, unless specified)
Closed Loop Output Resistance
100
10
1
0.1
0.01
10k
100k 1M 10M
Frequency (Hz)
100M
Recommended Rs vs. CL
70
+
60
-
1k
50 1k
40
30
20
10
0
10 100
CL (pF)
Rs
CL
1k
1000
Large & Small Signal Pulse Response
Large Signal
Small Signal
Time (10ns/div)
PSRR & CMRR
60
PSRR
50
CMRR
40
30
20
10
0
1k 10k 100k 1M 10M
Frequency (Hz)
100M
IBN, Vos vs. Temperature
-0.6
6
-0.7 5
IBN Vos
-0.8 4
-0.9 3
-1 2
-1.1
-100
-50 0
50 100
Temperature (°C)
1
150
Maximum Output Voltage vs. RL
4.8
4.4
4
3.6
3.2
2.8
2.4
2
1.6
10
100
RL (Ω)
1000
±5V Typical Performance (Av = +2, Rf = 1kΩ, RL = 100Ω, VCC = ± 5V, unless specified)
Non-Inverting Frequency Response
Vo = 1Vpp
Gain
Av = +2
Rf = 750Ω
Phase
Av = +1
Rf = 1kΩ
Av = +5
Rf = 402
Av = +10
Rf = 249Ω
1M 10M 100M
Frequency (Hz)
0
-45
-90
-135
-180
-225
Frequency Response vs. Vo
Inverting Frequency Response
Vo = 1Vpp
Gain
Av = -2
Rf = 604Ω
Phase
Av = -1
Rf = 681Ω
Av = -5
Rf = 453Ω
Av = -10
Rf = 402Ω
1M 10M 100M
Frequency (Hz)
-180
-225
-270
-315
-360
-425
Frequency Response vs. CL
Frequency Response vs. RL
Vo = 1Vpp
Gain
RL = 1kΩ
RL = 100Ω
Phase
RL = 25Ω
1M 10M 100M
Frequency (Hz)
Gain Flatness
0
-90
-180
-270
-360
-450
Vo = 0.1Vpp
Vo = 1Vpp
Vo = 5Vpp
Vo = 2Vpp
1M 10M 100M
Frequency (Hz)
Vo = 1Vpp
CL = 10pF
Rs = 68.1Ω
CL = 100pF
Rs = 17.4Ω
CL = 1000pF
Rs = 6.7Ω
+
-
1k
1k
Rs
CL
1k
1M 10M 100M
Frequency (Hz)
0 5 10 15 20 25 30
Frequency (MHz)
5 http://www.national.com
5 Page Where Req is the transformed value of the load imped-
ance, (RL), and is approximated by:
Req
=
RL
n2
Select the transformer so that it loads the line with a
value close to Zo, over the desired frequency range. The
output impedance, Ro, of the CLC452 varies with
frequency and can also affect the return loss. The return
loss, shown below, takes into account an ideal
transformer and the value of Ro.
Return Loss(dB) ≈ − 20log10
n2 ⋅ Ro
Zo
The load current (IL) and voltage (Vo) are related to the
CLC452’s maximum output voltage and current by:
Vo ≤ n ⋅ Vmax
IL
≤
I max
n
From the above current relationship, it is obvious that an
amplifier with high output drive capability is required.
11 http://www.national.com
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet CLC452.PDF ] |
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