December 1996
N
Comlinear CLC453
Single Supply, Low-Power, High Output,
Programmable Buffer
General Description
Features
■
The Comlinear CLC453 is a low cost, high speed (110MHz)
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 (3.0mA) from a single 5V supply. Its current feedback
architecture, fabricated in an advanced complementary bipolar
process, maintains consistent 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 CLC453’s
internal feedback network provides an excellent gain accuracy
of 0.3%
100mA output current
■
3.0mA supply current
■
110MHz bandwidth (A = +2)
v
■
■
■
■
■
■
-65/-84dBc HD2/HD3 (1MHz)
25ns settling to 0.05%
370V/µs slew rate
Stable for capacitive loads up to 1000pF
Single 5V to ±5V supplies
Available in Tiny SOT23-5 package
Applications
■
Coaxial cable driver
The CLC453 offers superior dynamic performance with a 110MHz
■
Twisted pair driver
small-signal bandwidth, 370V/µs slew rate and 4.8ns rise/fall
■
Transformer/Coil Driver
times (2V
). The combination of the small SOT23-5 package,
■
High capacitive load driver
step
low quiescent power, high output current drive, and high-speed
performance make the CLC453 well suited for many battery-
powered personal communication/computing systems.
■
Video line driver
Portable/battery-powered applications
A/D driver
■
■
Maximum Output Voltage vs. RL
The ability to drive low-impedance, highly capacitive loads,
makes the CLC453 ideal for single ended cable applications. It
also drives low impedance loads with minimum distortion. The
CLC453 will drive a 100Ω load with only -72/-74dBc second/third
10
9
8
VCC = ±5V
7
harmonic distortion (A = +2, V = 2V , f = 1MHz). With a 25Ω
v
out
pp
6
5
4
load, and the same conditions, it produces only -65/-77dBc
second/third harmonic distortion. It is also optimized for driving
high currents into single-ended transformers and coils.
3
2
1
Vs = +5V
When driving the input of high-resolution A/D converters, the
CLC453 provides excellent -65/-84dBc second/third harmonic
10
100
1000
distortion (A = +2, V
= 2V , f = 1MHz, R = 1kΩ) and fast
v
out
pp L
RL (Ω)
settling time.
Response After 10m of Cable
Typical Application
Single Supply Cable Driver
+5V
Vin = 10MHz, 0.5Vpp
6.8µF
+
+5V
1
8
7
6
5
1kΩ
1kΩ
5kΩ
0.1µF
2
10m of 75Ω
Coaxial Cable
0.1µF
0.1µF
75Ω
Vin
Vo
3
0.1µF
CLC453
75Ω
4
5kΩ
20ns/div
Vo
VCC
1kΩ
1kΩ
Pinout
Pinout
1kΩ
SOT23-5
DIP & SOIC
+
-
VEE
1kΩ
VEE
Vnon-inv
Vinv
© 1996 National Semiconductor Corporation
http://www.national.com