CLC451 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – Single Supply, Low-Power, High Output, Programmable Buffer

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 (2V_step). 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 (A_v = +2, V_out = 2V_pp, 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 (A_v = +2, V_out = 2V_pp, f = 1MHz, R_L = 1kΩ) and fast
settling time.
Features
s 100mA output current
s 1.5mA supply current
s 85MHz bandwidth (A_v = +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
1000
RL (Ω)
+5V
5kΩ
Vin ^{0.1µF 0.1µF}
5kΩ
1
1kΩ
1kΩ
2
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
Vo
Pinout
SOT23-5
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