ADS7809

6

SBAS017C

www.ti.com

TABLE II. Conversion and Data Timing. TA = –40°C to +85°C.

FIGURE 2. Serial Data Timing Using Internal Clock. (CS , EXT/INT and TAG Tied LOW.)

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

t1

Convert Pulse Width

40

6000

ns

t2

BUSY Delay

65

ns

t3

BUSY LOW

8

µs

t4

BUSY Delay After End of Conversion

220

ns

t5

Aperture Delay

40

ns

t6

Conversion Time

7.6

8

µs

t7

Acquisition Time

2

µs

t6 + t7

Throughput Time

9

10

µs

t8

R/C LOW to DATACLK Delay

450

ns

t9

DATACLK Period

440

ns

t10

Data Valid to DATACLK HIGH Delay

20

75

ns

t11

Data Valid After DATACLK LOW Delay

100

125

ns

t12

External DATACLK

100

ns

t13

External DATACLK HIGH

20

ns

t14

External DATACLK LOW

30

ns

t15

DATACLK HIGH Setup Time

20

t12 + 5

ns

t16

R/C to CS Setup Time

10

ns

t17

SYNC Delay After DATACLK HIGH

15

35

ns

t18

Data Valid Delay

25

55

ns

t19

CS to Rising Edge Delay

25

ns

t20

Data Available after CS LOW

6

µs

1

MSB Valid

R/C

DATACLK

SDATA

t

8

t

11

t

10

t

9

2

3

15

16

Bit 14 Valid

Bit 1 Valid

Bit 13 Valid

LSB Valid

t

2

t

3

BUSY

t

1