CLC2005ISO8X datasheet(14/19 Pages) EXAR

14 / 19 page

14 / 19

exar.com/CLC1005

Rev 2D

CLC1005, CLC1015, CLC2005

0.5

1.5

-40

-20

Ambient Temperature (°C)

MSOP-8

SOIC-8

TSOT-5

TSOT-6

Figure 7. Maximum Power Derating

Driving Capacitive Loads

Increased phase delay at the output due to capacitive loading

can cause ringing, peaking in the frequency response, and

possible unstable behavior. Use a series resistance, RS,

between the amplifier and the load to help improve stability

and settling performance. Refer to Figure 8.

Input

Output

Figure 8. Addition of RS for Driving Capacitive Loads

Table 1 provides the recommended RS for various capacitive

loads. The recommended RS values result in approximately

<1dB peaking in the frequency response.

CL (pF)

RS (Ω)

-3dB BW (MHz)

22pF

118

47pF

112

100pF

492pF

6.5

Table 1: Recommended RS vs. CL

For a given load capacitance, adjust RS to optimize the

tradeoff between settling time and bandwidth. In general,

reducing RS will increase bandwidth at the expense of

additional overshoot and ringing.

Layout Considerations

General layout and supply bypassing play major roles in

high frequency performance. Exar has evaluation boards to

use as a guide for high frequency layout and as an aid in

device testing and characterization. Follow the steps below

as a basis for high frequency layout:

■

Include 6.8µF and 0.1µF ceramic capacitors for power supply

decoupling

■

Place the 6.8µF capacitor within 0.75 inches of the power pin

■

Place the 0.1µF capacitor within 0.1 inches of the power pin

■

Remove the ground plane under and around the part,

especially near the input and output pins to reduce parasitic

capacitance

■

Minimize all trace lengths to reduce series inductances

Refer to the evaluation board layouts below for more

information.

Evaluation Board Information

The following evaluation boards are available to aid in the

testing and layout of these devices:

Evaluation Board #

Products

CEB002

CLC1005 and CLC1015 in TSOT

CEB003

CLC1005 in SOIC

CEB006

CLC2005 in SOIC

CEB010

CLC2005 in MSOP

Evaluation Board Schematics

Evaluation board schematics and layouts are shown in

Figures 9-18. These evaluation boards are built for dual-

supply operation. Follow these steps to use the board in a

single-supply application:

1. Short -VS to ground.

2. Use C3 and C4, if the -VS pin of the amplifier is not

directly connected to the ground plane.

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