CLC503 Datasheet, PDF (1/6 Pages) National Semiconductor (TI) – Comlinear CLC503 180MHz, Differential-Output Amplifier

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Comlinear CLC503
180MHz, Differential-Output Amplifier
August 1996
General Description
The Comlinear CLC503 is a single-ended to differential amplifier.
It utilizes a pair of closed-loop transconductance amplifiers to
provide wideband, high fidelity, differential output signals. Internal
resistors set the differential gain to 2V/V. With a ground-centered
2V_pp input signal, the CLC503 will produce a 4V_pp differential
output signal. This differential output signal is centered around an
adjustable common mode voltage. An independent input controls
the common mode output voltage. The CLC503 has harmonic
distortion products of -77dBc or less, and a signal to noise ratio of
72dB. The output stage is optimized for loads with signal ranges
between +0.7 and +3.9 volts, such as those found on single
supply CMOS ADCs. Overdrive recovery time of the CLC503
and following circuitry is optimized by the output limiting of the
CLC503. The power down pin (P_DN) allows for power savings
in applications where unused circuitry is placed in a low
power mode.
Features
s -77dBc distortion (10MHz, 4V_pp)
s 72dB SNR (4V_pp)
s 15ns settling (0.1%)
s 180MHz bandwidth
Applications
s Single-to-differential conversion
s Single supply ADC signal conditioner
Harmonic Distortion vs. Amplitude
-60
RL = 2kΩ
-65
-70
10MHz
5MHz
-75
The CLC503 is an ideal amplifier to drive the differential inputs
of the Comlinear CLC949, 12-bit, 20MSPS, analog-to-digital
converter. It is tailored for driving single supply, differential
input, analog-to-digital converters which require fast settling, high
fidelity inputs.
-80
1MHz
-85
2MHz
-90
0
1
2
3
4
5
Output Amplitude (Vpp)
Typical Application Diagram
ADC Clock
Power Down
74AC04
Vin
0.1µF
6.8µF
CLC503
PDN
Vin
GND
VEE
Vcm
+Vo
-Vo
VCC
-5V
0.1µF
VREFMO BIASC
CLK
0.1µF
6.8µF
+5V
VINP
VINN
CLC949
12b/20MSPS ADC
VCC GND
0.1µF
Pinout
SOIC
PDN
Vin
GND
VEE
2K
AMP
2K ^CORE
Vcm
+Vo
-Vo
VCC
© 1996 National Semiconductor Corporation
Printed in the U.S.A.
http://www.national.com