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PDF CLC451 Data sheet ( Hoja de datos )
| Número de pieza | CLC451 | |
| Descripción | Single Supply/ Low-Power/ High Output/ Programmable Buffer | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1999
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/µs slew rate and 6.5ns rise/fall
times (2Vstep). The combination of the small SOT23-5 package,
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 100Ω load with only -78/-65dBc second/third
harmonic distortion (Av = +2, Vout = 2Vpp, f = 1MHz). With a 25Ω
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 (Av = +2, Vout = 2Vpp, f = 1MHz, RL = 1kΩ) and fast
settling time.
Features
s 100mA output current
s 1.5mA supply current
s 85MHz bandwidth (Av = +2)
s -66/-75dBc HD2/HD3 (1MHz)
s 25ns settling to 0.05%
s 260V/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
5kΩ
Vin 0.1µF 0.1µF
5kΩ
1
1kΩ
2
1kΩ
3
CLC451
4
+5V
6.8µF
+
8
7 0.1µF
75Ω
6
0.1µF
5
Typical Application
Single Supply Cable Driver
10m of 75Ω
Coaxial Cable
Vo
75Ω
Response After 10m of Cable
Vin = 10MHz, 0.5Vpp
20ns/div
Pinout
SOT23-5
Vo
VEE
Vnon-inv
1kΩ
+-
1kΩ
VCC
Vinv
Pinout
DIP & SOIC
VEE
1kΩ
1kΩ
© 1999 National Semiconductor Corporation
Printed in the U.S.A.
http://www.national.com
1 page  
+5V Typical Performance (Av = +2, RL = 100Ω, Vs = + 5V1, Vcm = VEE + (Vs/2), RL tied to Vcm, unless specified)
Closed Loop Output Resistance
100
10
1
Recommended Rs vs. CL
50
+
40
-
1k
1k
30
Rs
CL
1k
20
Large & Small Signal Pulse Response
Large Signal
Small Signal
0.1 10
0.01
10k
100k 1M 10M
Frequency (Hz)
100M
PSRR & CMRR
60
PSRR
50
CMRR
40
30
20
10
0
1k
10k 100k 1M 10M
Frequency (Hz)
100M
0
10 100
CL (pF)
IBN, Vos vs. Temperature
-0.6
1000
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
Time (10ns/div)
Maximum Output Voltage vs. RL
5
4.5
4
3.5
3
2.5
2
1.5
1
10 100
RL (Ω)
1000
±5V Typical Performance (Av = +2, RL = 100Ω, VCC = ± 5V, unless specified)
Frequency Response
Vo = 1Vpp
Gain
Phase
Av = +1
Av = 2
1M 10M
Frequency (Hz)
Av = -1
100M
0
-45
-90
-135
-180
-225
Frequency Response vs. Vo (Av = +1)
Vo = 1Vpp
Frequency Response vs. RL
Vo = 1Vpp
Gain
RL = 1kΩ
RL = 100Ω
Phase
RL = 25Ω
1M 10M 100M
Frequency (Hz)
Frequency Response vs. Vo (Av = -1)
0
-90
-180
-270
-360
-450
Vo = 2Vpp
Vo = 2Vpp
Vo = 0.1Vpp
Vo = 5Vpp
Vo = 1Vpp
Vo = 0.1Vpp
1M 10M 100M
Frequency (Hz)
1M 10M 100M
Frequency (Hz)
Frequency Response vs. Vo (Av = 2)
Vo = 1Vpp
Vo = 2Vpp
Vo = 0.1Vpp
Vo = 5Vpp
1M 10M
Frequency (Hz)
Frequency Response vs. CL
100M
Vo = 1Vpp
CL = 10pF
Rs = 49.9Ω
CL = 100pF
Rs = 17.4Ω
CL = 1000pF
Rs = 6.7Ω
+
-
1k
1k
Rs
CL
1k
1M 10M
Frequency (Hz)
100M
5 http://www.national.com
5 Page 
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.
18
1kΩ
Vin
1kΩ
2
3
7 V = Av Vin Rm
6
1:n
V
=
n
4
A v Vin
Zo
IL
+
Rt
CLC451
45
UTP
RL Vo
-
6.8µF
+
0.1µF
Av = 2
Req
V
=
-n
4
A v Vin
Vo
=
1n
2
A v Vin
VEE
Figure 13: Twisted Pair Driver
To match the line’s characteristic impedance (Zo) set:
s RL = Zo
s Rm = Req
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 CLC451 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
CLC451’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 CLC451.PDF ] | |
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