CLC416 datasheet(4/6 Pages) NSC

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CLC416 Typical Performance Characteristics (Vcc = ±5V, Av = +2, R

f = 348Ω

Ω,, R

L = 100Ω

Ω; unless specified)

CLC416 OPERATION

Description

The CLC416 is a dual current feedback amplifier with

the following features:

Differential gain and phase errors of 0.01%

and 0.03° into a 150

Ω load

Low, 3.9mA, supply current per amplifier

The professional video quality differential gain and

phase errors and low power capabilities of the CLC416

make this product a good choice for video applications.

Gain

The non-inverting and inverting gain equations for the

CLC416 are as follows:

Non-inverting Gain:

Inverting Gain:

Where Rf is the feedback resistor and Rg is the gain

setting resistor. Figure 1 shows the general non-invert-

ing gain configuration including the recommended

bypass capacitors.

Figure 1: Recommended Non-Inverting Gain Circuit

Feedback Resistor Selection

The feedback resistor, Rf, determines the loop gain

and frequency response of a current feedback

amplifier. Optimum performance of the CLC416, at a

gain of +2V/V, is achieved with Rf equal to 348Ω. The

frequency response plots in the typical performance

section illustrate the recommended Rf for several

gains. Within limits, Rf can be adjusted to optimize the

frequency response.

Decrease Rf to peak frequency response and

extend bandwidth

Increase Rf to roll off frequency response and

reduce bandwidth

As a rule of thumb, if the recommended Rf is doubled,

the bandwidth will be cut in half.

Channel Matching

Channel matching and crosstalk efficiency are largely

dependent on board layout.

The layout of National’s

dual amplifier evaluation boards are designed to produce

optimum channel matching and isolation.

Typical

channel matching for the CLC416 is shown in Figure 2.

Figure 2: Channel Matching

The CLC416’s channel-to-channel isolation is better

than 70dB for input frequencies of 4MHz. Input

referred crosstalk vs. frequency is illustrated in Figure 3.

Typical DC Errors vs. Temperature

Temperature (

°C)

-50

100

IBN

-1

-2

-3

IBI

VIO

Equivalent Input Noise

Frequency (Hz)

100

10k

100k

10M

100

Inverting Current = 12pA/

√Hz

Voltage = 5nV/

√Hz

Non-Inverting Current = 3pA/

√Hz

Power Derating Curves

Ambient Temperature (

°C)

0.8

1.0

0.6

100

120 140

160 180

0.4

0.2

AJE

AJP

−

CLC416

0.1

µF

6.8

µF

Vin

+Vcc

0.1

µF

6.8

µF

-Vcc

Rin

Frequency (MHz)

100

Av = +2

RL = 100Ω

Vo = 2Vpp

-450

-360

-270

-180

-90

Channel B

Channel A

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