AD9255 datasheet(9/45 Pages) AD

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AD9255

Data Sheet

Rev. C | Page 8 of 44

SWITCHING SPECIFICATIONS

AVDD = 1.8 V, DRVDD = 1.8 V, SVDD = 1.8 V, maximum sample rate, VIN = −1.0 dBFS differential input, 1.0 V internal reference, and

DCS enabled, unless otherwise noted.

Table 4.

AD9255BCPZ-801

AD9255BCPZ-1051

AD9255BCPZ-1251

Parameter

Temp

Min

Typ

Max

Min

Typ

Max

Min

Typ

Max

Unit

CLOCK INPUT PARAMETERS

Input Clock Rate

Full

625

MHz

Conversion Rate2

DCS Enabled

Full

105

125

MSPS

DCS Disabled

Full

105

125

MSPS

CLK Period—Divide-by-1 Mode (tCLK)

Full

12.5

9.5

CLK Pulse Width High (tCH)

Divide-by-1 Mode

DCS Enabled

Full

3.75

6.25

8.75

2.85

4.75

6.65

2.4

5.6

DCS Disabled

5.9

6.25

6.6

4.5

4.75

5.0

3.8

4.2

Divide-by-3 Mode, Divide-by-5 Mode, and

Divide-by-7 Mode, DCS Enabled3

Full

0.8

Divide-by-2 Mode, Divide-by-4 Mode, Divide-

by-6 Mode, and Divide-by-8 Mode, DCS

Enabled or DCS Disabled3

Full

0.8

Aperture Delay (tA)

Full

1.0

Aperture Uncertainty (Jitter, tJ)

Full

0.07

ps rms

DATA OUTPUT PARAMETERS

CMOS Mode

Data Propagation Delay (tPD)

Full

2.4

2.8

3.4

2.4

2.8

3.4

2.4

2.8

3.4

DCO Propagation Delay (tDCO)4

Full

2.7

3.4

4.2

2.7

3.4

4.2

2.7

3.4

4.2

DCO to Data Skew (tSKEW)

Full

0.3

0.6

0.9

0.3

0.6

0.9

0.3

0.6

0.9

Pipeline Delay (Latency)

Full

Cycles

LVDS Mode

Data Propagation Delay (tPD)

Full

2.6

3.4

4.2

2.6

3.4

4.2

2.6

3.4

4.2

DCO Propagation Delay (tDCO)4

Full

3.3

3.8

4.3

3.3

3.8

4.3

3.3

3.8

4.3

DCO to Data Skew (tSKEW)

−0.3

+0.4

+1.2

−0.3

+0.4

+1.2

−0.3

+0.4

+1.2

Pipeline Delay (Latency)

Full

12.5

Cycles

Wake-Up Time5

Full

500

μs

OUT-OF-RANGE RECOVERY TIME

Full

Cycles

1 The suffix following the part number refers to the model found in the Ordering Guide section.

2 Conversion rate is the clock rate after the divider.

3 See the Input Clock Divider section for additional information on using the DCS with the input clock divider.

4 Additional DCO delay can be added by writing to Bit 0 through Bit 4 in SPI Register 0x17 (see Table 17).

5 Wake-up time is defined as the time required to return to normal operation from power-down mode.

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