XRD6415 查看數據表（PDF） - Exar Corporation

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XRD6415

CMOS 10-Bit, 20 MSPS, High Speed Analog-to-Digital Converter

Exar Corporation 

Power Supply Sequencing

There are no power supply sequencing issues if DVDD

and VDD of the XRD6415 are driven from the same

supply. Best parametric results, however, are obtained

when DVDD and VDD are driven from separate supplies.

When DVDD and VDD are driven separately, VDD must

come up at the same time or before DVDD, and go down at

the same time or after DVDD. If the power supply

sequencing in this case is not followed, then damage may

occur to the product due to current flow through the

source-body junction diodes between DVDD and VDD. An

external diode (5082-2235) layed out close to the

converter from DVDD to VDD prevents damage from

occurring when power is cycled incorrectly.

XRD6415

PD

High

Low

Device Status

Off (Not Operating)

On (Operating)

Table 2. Power Down

Figure 6. Crossplot Staircase Output

CLK = (15MSPS, trf = 15ns), VDD = 3V,

VREF = 2V

VDD DVDD

RS

VIN

CIN

XRD6415

Latch

10

10

100pF

GND

DGND

Figure 7. FFT Test Circuit

(Refer to XRD6415 Application Board

Note for Details)

Rev. 1.00

11

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