XR8051ASO8X データシートの表示（PDF） - Exar Corporation

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XR8051ASO8X

Low Cost, High Speed Rail-to-Rail Amplifers

Exar Corporation 

Data Sheet

Table 1 provides the recommended RS for various capacitive

loads. The recommended RS values result in approximately

<1dB peaking in the frequency response.

Evaluation Board #

Products

CEB006

XR8052 in SOIC

CEB010

XR8052 in MSOP

CEB018

XR8054 in SOIC

CL (Pf)

22pF

47pF

100pF

492pF

Rs (Ω)

0

15

15

6.5

-3db BW (MHz)

120

80

65

40

Evaluation Board Schematics

Evaluation board schematics and layouts are shown in

Figures 10-18. These evaluation boards are built for dual-

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

single-supply application:

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.

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.

Layout Considerations

General layout and supply bypassing play major roles in

high frequency performance. CADEKA 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.

Figure 8. CEB002 & CEB003 Schematic

Evaluation Board Information

The following evaluation boards are available to aid in the

testing and layout of these devices:

Evaluation Board #

Products

CEB002

XR8051 in SOT23

CEB003

XR8051 in SOIC

©2013 Exar Corporation

19/23

Rev 1A

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