Datasheet

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TIMING REQUIREMENTS, T
A
= –40 °C to 85 °C
V
DIG
V
ANA
BUSY
CS
R/C
TAG
DATA
DATACLK
SYNC
R1
IN
AGND1
REF
CAP
AGND2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DW PACKAGE
R2
IN
R3
IN
SB/BTC
EXT/INT
DGND
PWRD
(TOP VIEW)
ADS8508
SLAS433 – SEPTEMBER 2005
PARAMETER MIN TYP MAX UNIT
t
w1
Pulse duration, convert 40 ns
t
d1
Delay time, BUSY from R/ C low 6 20 ns
t
w2
Pulse duration, BUSY low 2.2 µs
t
d2
Delay time, BUSY, after end of conversion 5 ns
t
d3
Delay time, aperture 5 ns
t
conv
Conversion time 2.2 µs
t
acq
Acquisition time 1.8 µs
t
conv
+ t
acq
Cycle time 4 µs
t
d4
Delay time, R/ C Low to internal DATACLK output 270 ns
t
c1
Cycle time, internal DATACLK 110 ns
t
d5
Delay time, data valid to internal DATACLK high 15 35 ns
t
d6
Delay time, data valid after internal DATACLK low 20 35 ns
t
c2
Cycle time, external DATACLK 35 ns
t
w3
Pulse duration, external DATACLK high 15 ns
t
w4
Pulse duration, external DATACLK low 15 ns
t
su1
Setup time, R/ C rise/fall to external DATACLK high 15 t
C2
+ 5 ns
t
su2
Setup time, R/ C transition to CS transition 10 ns
t
d7
Delay time, SYNC, after external DATACLK high 3 35 ns
t
d8
Delay time, data valid 2 20 ns
t
d9
Delay time, CS to rising edge 10 ns
t
d10
Delay time, previous data available after CS, R/ C low 2 µs
t
su3
Setup time, BUSY transition to first external DATACLK 5 ns
t
d11
Delay time, final external DATACLK to BUSY falling edge 1 µs
t
su3
Setup time, TAG valid 0 ns
t
h1
Hold time, TAG valid 2 ns
5