XRD64L42 datasheet(10/16 Pages) EXAR

Part #	XRD64L42

Description	Dual 10-Bit 40MSPS CMOS ADC

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Manufacturer	EXAR [Exar Corporation]

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XRD64L42

10

Rev. P2.10

APPLICATION SECTION

Voltage References

The top ladder voltage for the XRD64L42 can be

provided from an internal bandgap reference. The

bandgap reference and its feedback path, Pins 1 and

2 respectively, can be used to set the voltage for

VRHF. Select Rf and Ri (if gain is necessary) so that

VRHF=VBG(1+Rf/Ri). The internal bandgap voltage

is 1.24 volts. The XRD64L42 has a low impedence

ladder, therefore, the typical value for Rf and Ri is 10K

(Rf and Ri are recommended to be greater than

5K).See Figure 1. for a simplified diagram.

VBG

Bandgap

VFBK

VRHF

VRLF

XRD64L42

Resistive Ladder

Rf

Ri

External voltage references can be forced at VRHF and

VRLF. If VRHF and VRLF are driven externally, VFBK

should be connected to AVdd, which tri-states the

bandgap reference. Direct inputs or inputs driven by

external amplifiers can be used to drive the ladder

reference voltages of the XRD64L42. See Figure 2. for

a simplified diagram.

Figure 2. Voltage Reference Generated from the

Internal Bandgap Voltage

Figure 3. Voltage Reference Provided by an Ex-

ternal Source as Direct Inputs

VBG

Bandgap

VFBK

VRHF

VRLF

XRD64L42

Resistive Ladder

AVdd

Direct Input

Single-Ended Inputs

The XRD64L42 can be used in either single-ended or

differential input mode. For differential inputs, see the

Differential Inputs Section. Single-ended inputs mini-

mize the amount of external components necessary to

interface with the XRD64L42. The common inputs,

VINA(-) and VINB(-) should be tied to ground. VINA(+)

and VINB(+) can be used to apply direct inputs to the

XRD64L42. Figure 3. is a simplied diagram for single-

ended inputs. Pin 15, DIFF should be held low to select

single-ended inputs.

Figure 4. Single-Ended Inputs for the XRD64L42

Input A

Input B

50

VINA(+)

VINA(-)

VINB(+)

VINB(-)

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