AD9218

Rev. C | Page 6 of 28

SWITCHING SPECIFICATIONS

D

Table 4.

Test

AD9218BST-40/-65

AD9218BST-80/-105

Parameter

Temp

Level

Min

Typ

Max

Min

Typ

Max

Unit

ENCODE INPUT PARAMETERS

Maximum Encode Rate

Full

VI

40/65

80/105

MSPS

Minimum Encode Rate

Full

IV

20/20

20/20

MSPS

Full

IV

7/6

5/3.8

ns

Full

IV

7/6

5/3.8

ns

25°C

V

2

2

ns

Aperture Uncertainty (Jitter)

25°C

V

3

3

ps rms

DIGITAL OUTPUT PARAMETERS

Output Valid Time (tV)

Full

VI

2.5

2.5

ns

1

Output Propagation Delay (tPD)1

Full

VI

4.5

7

4.5

6

ns

25°C

V

1

1.0

ns

25°C

V

1.2

1.2

ns

Out-of-Range Recovery Time

25°C

V

5

5

ns

Transient Response Time

25°C

V

5

5

ns

Recovery Time from Power-Down

25°C

V

10

10

Cycles

Pipeline Delay

Full

IV

5

5

Cycles

V

PD

are measured from the 1.5 level of the ENCODE input to the 50%/50% levels of the digital outputs swing. The digital output load during test is not to exceed

an ac load of 5 pF or a dc current of ±40 μA. Rise and fall times are measured from 10% to 90%.

TIMING DIAGRAMS

SAMPLE N

ENCODE A

ENCODE B

DATA N – 5

DATA N – 4

DATA N – 3

DATA N – 2

DATA N – 1

DATA N

DATA N – 5

DATA N – 4

DATA N – 3

DATA N – 2

DATA N – 1

DATA N

SAMPLE

N + 1

SAMPLE

N + 5

SAMPLE

N + 6

SAMPLE

N + 2

SAMPLE

N + 3

SAMPLE

N + 4

Figure 2. Normal Operation, Same Clock (S1 = 1, S2 = 0) Channel Timing