CLC423 datasheet(4/8 Pages) NSC

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CLC423 OPERATIONS

Description

The CLC423 is a voltage feedback amplifier designed for

single supply operation. The CLC423 is a single version

of the CLC427 with the following features:

Operates from a single +5V supply

Maintains near rail-to-rail performance

Includes the negative rail (0V) in the Common

Mode Input Range (CMIR)

Offers low -74/-94dBc 2nd and 3rd harmonic

distortion

Provides BW > 20MHz and 1MHz distortion

< -50dBc at Vo = 4Vpp

Single Supply Operation (VCC = +5V, VEE = GND)

The CLC423 is designed to operate from 0 and 5V

supplies. The specifications given in the

Electrical

Characteristics table are measured with a common

mode voltage (Vcm) of 2.5V. Vcm is the voltage around

which the inputs are applied and the output voltages are

specified.

Operating from a single +5V supply, the CMIR of the

CLC423 is typically 0V to +3.7V. The typical output range

with RL = 150Ω is +0.35V to +4.5V.

For DC coupled single supply operation, it is recom-

mended that input signal levels remain above ground.

For input signals that drop below ground, AC coupling

and level shifting the signal are possible remedies.

For input signals that remain above ground, no

adjustments need to be made. The non-inverting and

inverting configurations for both input conditions are

illustrated in the following 2 sections.

DC Coupled Single Supply Operation

Figures 1 and 2 show the recommended non-inverting

and inverting configurations for purely positive input

signals.

Figure 1: Non-inverting Configuration

Figure 2: Inverting Configuration

AC Coupled Single Supply Operation

Figures 3 and 4 show possible non-inverting and

inverting configurations for input signals that go below

ground. The input is AC coupled to prevent the need

for level shifting the input signal at the source.

The

resistive voltage divider biases the non-inverting input to

VCC ÷ 2 = 2.5V.

Figure 3: AC Coupled Non-inverting Configuration

Figure 4: AC Coupled Inverting Configuration

CLC423

0.1

µF

6.8

µF

Vin

+5V

CLC423

0.1

µF

6.8

µF

Vin

+5V

=−

Select R to yield

desired R

R || R

CLC423

0.1

µF

6.8

µF

Vin

+5V

2.5











 +

low frequency cutoff

2R C

, where: R

2.5V

RRsource

CLC423

0.1

µF

6.8

µF

Vin

+5V

2.5

=−











 +

low frequency cutoff

2R C

2.5V

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