AD9042DSLASHPCB datasheet(7/24 Pages) AD

7 / 24 page

DIGITAL

OUTPUTS

(D11–D0)

N – 1

N – 2

tA = –250 PS TYP

N + 1

tOD = 9ns TYP

ANALOG

INPUT

(AIN)

ENCODE

INPUTS

(ENCODE)

Figure 1. Timing Diagram

REV. A

–7–

REV. A

–7–

Equivalent Circuits–AD9042

VOFFSET

200

Ω

6pF

250

Ω

250

Ω

AVCC

AIN

250µA

+3.5V

AVCC

250µA

AVCC

+1.5V

Figure 2. Analog Input Stage

AVCC

TIMING

CIRCUITS

Ω

17k

Ω

17k

Ω

ENCODE

AVCC

Figure 3. Encode Inputs

AVCC

(PIN 10

CURRENT

MIRROR

VREF

AVCC

*AD9042AST ONLY

INTERNAL NODE ON AD9042AD

Figure 4. Compensation Pin, C1

VREF

DVCC

CURRENT

MIRROR

CURRENT

MIRROR

D0–D11

Figure 5. Digital Output Stage

VREF

AVCC

0.5mA

2.4V

AVCC

Figure 6. 2.4 V Reference

+5V

2,12,14

10k

Ω

200kHz

SINEWAVE

TTL CLOCK OSC.

0.1µF

49.9

Ω

NOTE: ALL +5V SUPPLY PINS & VREF PIN BYPASSED TO GND

WITH A 0.1µF CAPACITOR. PINS 15,16 ARE NOT CONNECTED.

1,3,6,7,11,13

ENCODE

AIN

VOFFSET

VREF

D11

Figure 7. AD9042AD Burn-In Diagram

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