AD6640 データシートの表示（PDF） - Analog Devices

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AD6640

12-Bit, 65 MSPS IF Sampling A/D Converter

Analog Devices 

Equivalent Circuits–AD6640

tA

AIN

N

ANALOG

INPUTS

AIN

ENCODE INPUTS

(ENCODE)

N+1

DIGITAL OUTPUTS

(D11–D0)

N–2

tOD

N–1

N

Figure 1. Timing Diagram

VCH AVCC

AIN

BUF

450⍀

VCL

VCH AVCC

450⍀

BUF

AIN

BUF

T/H

VREF

T/H

VCL

Figure 2. Analog Input Stage

DVCC

CURRENT

MIRROR

VREF

DVCC

D0–D11

AVCC

ENCODE

AVCC

R1

17k⍀

R2

8k⍀

TIMING

CIRCUITS

R1

17k⍀

R2

8k⍀

AVCC

ENCODE

Figure 3. ENCODE Inputs

AVCC

VREF

AVCC

AVCC

CURRENT

MIRROR

C1

Figure 4. Compensation Pin, C1

CURRENT

MIRROR

Figure 5. Digital Output Stage

2.4V

AVCC

AVCC

0.5mA

VREF

Figure 6. 2.4 V Reference

REV. A

–7–

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