AD9858_15 datasheet(5/32 Pages) AD

Part #	AD9858

Description	1 GSPS Direct Digital Synthesizer

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Manufacturer	AD [Analog Devices]

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AD9858

Rev. C | Page 5 of 32

Parameter

Temp

Test Level

Min

Typ

Max

Unit

TIMING CHARACTERISTICS

Serial Control Bus

Maximum Frequency

Full

IV

10

MHz

Minimum Clock Pulse Width Low (tPWL)

Full

IV

5.5

ns

Minimum Clock Pulse Width High (tPWH)

Full

IV

15

ns

Maximum Clock Rise/Fall Time

Full

IV

1

ns

Minimum Data Setup Time (tDS)

Full

IV

7

ns

Minimum Data Hold Time (tDH)

Full

IV

0

ns

Maximum Data Valid Time (tDV)

Full

IV

20

ns

Parallel Control Bus10

WR Minimum Low Time (tWRLOW)

Full

IV

3

ns

WR Minimum High Time (tWRHIGH)

Full

IV

6

ns

WR Minimum Period (tWR)

Full

IV

9

ns

Address to WR Setup (tASU)

Full

IV

3

ns

Address to WR Hold (tAHU)

Full

IV

0

ns

Data to WR Setup (tDSU)

Full

IV

3.5

ns

Data to WR Hold (tDHU)

Full

IV

0

ns

Miscellaneous Timing Specifications

REFCLK to SYNCLK

Full

V

2.5

ns

FUD/PS[1:0] to SYNCLK Setup Time11

Full

IV

4

ns

FUD/PS[1:0] to SYNCLK Hold Time11

Full

IV

0

ns

REFCLK to SYNCLK Delay

Full

IV

2.5

3

ns

DATA LATENCY (PIPELINE DELAY)

FTW/POW to DAC Output

25°C

IV

83

SYSCLK

cycles12

DFTW to DAC Output

25°C

IV

99

SYSCLK

cycles12

1 REFCLK input is internally dc biased. AC coupling should be used.

2 Reference clock frequency is selected to ensure that the second harmonic is out of the bandwidth of interest.

3 PD inputs set at 400 MHz with divide-by-4 enabled.

4 The charge pump current is programmable in eight discrete steps; minimum value assumes current sharing.

5 For 0.75 V < VCP < CPVDD − 0.75 V.

6 These differential inputs are internally dc biased. AC coupling should be used.

7 The charge pump supply voltage can range from 4.75 V to 5.25 V.

8 DAC output is differential open collector.

9 For 1 dB output compression; input power measured at 50 Ω.

10 See Figure 35 and Figure 36 for timing diagrams.

11 See Figure 34 for timing diagram.

12 SYSCLK = REFCLK/x, where x is 1 or 2, as set using CFR[6].

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