AD1939 datasheet(8/33 Pages) AD

Part #	AD1939

Description	4 ADC/8 DAC with PLL

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Data Sheet

AD1939

Rev. E | Page 7 of 32

Parameter

Condition

Comments

Min

Max

Unit

SPI PORT

See Figure 11

tCCH

CCLK high

35

ns

tCCL

CCLK low

35

ns

fCCLK

CCLK frequency

fCCLK = 1/tCCP; only tCCP shown in Figure 11

10

MHz

tCDS

CIN setup

To CCLK rising

10

ns

tCDH

CIN hold

From CCLK rising

10

ns

tCLS

CLATCH setup

To CCLK rising

10

ns

tCLH

CLATCH hold

From CCLK falling

10

ns

tCLHIGH

CLATCH high

Not shown in Figure 11

10

ns

tCOE

COUT enable

From CCLK falling

30

ns

tCOD

COUT delay

From CCLK falling

30

ns

tCOH

COUT hold

From CCLK falling, not shown in Figure 11

30

ns

tCOTS

COUT tristate

From CCLK falling

30

ns

DAC SERIAL PORT

See Figure 24

tDBH

DBCLK high

Slave mode

10

ns

tDBL

DBCLK low

Slave mode

10

ns

tDLS

DLRCLK setup

To DBCLK rising, slave mode

10

ns

tDLH

DLRCLK hold

From DBCLK rising, slave mode

5

ns

tDLS

DLRCLK skew

From DBCLK falling, master mode

−8

+8

ns

tDDS

DSDATA setup

To DBCLK rising

10

ns

tDDH

DSDATA hold

From DBCLK rising

5

ns

ADC SERIAL PORT

See Figure 25

tABH

ABCLK high

Slave mode

10

ns

tABL

ABCLK low

Slave mode

10

ns

tALS

ALRCLK setup

To ABCLK rising, slave mode

10

ns

tALH

ALRCLK hold

From ABCLK rising, slave mode

5

ns

tALS

ALRCLK skew

From ABCLK falling, master mode

−8

+8

ns

tABDD

ASDATA delay

From ABCLK falling

18

ns

AUXILIARY INTERFACE

tAXDS

AAUXDATA setup

To AUXBCLK rising

10

ns

tAXDH

AAUXDATA hold

From AUXBCLK rising

5

ns

tDXDD

DAUXDATA delay

From AUXBCLK falling

18

ns

tXBH

AUXBCLK high

10

ns

tXBL

AUXBCLK low

10

ns

tDLS

AUXLRCLK setup

To AUXBCLK rising

10

ns

tDLH

AUXLRCLK hold

From AUXBCLK rising

5

ns

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