ADS5231
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SBAS295A–JULY 2004–REVISED JANUARY 2007
TIMING CHARACTERISTICS(1)
Typical values at TA = +25°C, AVDD = VDRV = 3.3V, sampling rate and PLL state are as indicated, input clock at 50% duty
cycle, and total capacitive loading = 10pF, unless otherwise noted.
PARAMETER
MIN
TYP
MAX
UNITS
40MSPS With PLL ON
tA Aperture Delay
Aperture Jitter
2.1
1.0
5.5
13.5
6
ns
ps
t1 Data Setup Time(2)
t2 Data Hold Time(3)
3.7
ns
11.5
ns
tD Data Latency
Clocks
ns
tDR, tDF Data Rise/Fall Time(4)
Data Valid (DV) Duty Cycle
tDV Input Clock Rising to DV Fall Edge
0.5
2
3
30
13.5
40
16
55
%
18.5
ns
30MSPS With PLL OFF
tA Aperture Delay
Aperture Jitter
2.1
1.0
10
19
6
ns
ps
t1 Data Setup Time
8
ns
t2 Data Hold Time
14
ns
tD Data Latency
Clocks
ns
tDR, tDF Data Rise/Fall Time
Data Valid (DV) Duty Cycle
tDV Input Clock Rising to DV Fall Edge
0.5
2
3.5
55
21
30
16
45
19
%
ns
20MSPS With PLL ON
tA Aperture Delay
Aperture Jitter
2.1
1.0
12
25
6
ns
ps
t1 Data Setup Time
10
20
ns
t2 Data Hold Time
ns
tD Data Latency
Clocks
ns
tDR, tDF Data Rise/Fall Time
Data Valid (DV) Duty Cycle
tDV Input Clock Rising to DV Fall Edge
0.5
2
3.5
55
30
30
20
45
25
%
ns
20MSPS With PLL OFF
tA Aperture Delay
Aperture Jitter
2.1
1.0
12
25
6
ns
ps
t1 Data Setup Time
10
20
ns
t2 Data Hold Time
ns
tD Data Latency
Clocks
ns
tDR, tDF Data Rise/Fall Time
Data Valid (DV) Duty Cycle
tDV Input Clock Rising to DV Fall Edge
0.5
2
3.5
55
30
30
20
45
25
%
ns
2MSPS With PLL OFF
tA Aperture Delay
Aperture Jitter
2.1
1.0
200
250
6
ns
ps
t1 Data Setup Time
150
200
ns
t2 Data Hold Time
ns
tD Data Latency
Clocks
ns
tDR, tDF Data Rise/Fall Time
Data Valid (DV) Duty Cycle
tDV Input Clock Rising to DV Fall Edge
0.5
30
2
3.5
55
45
%
200
225
250
ns
(1) Specifications assured by design and characterization; not production tested.
(2) Measured from data becoming valid (at a high level = 2.0V and a low level = 0.8V) to the 50% point of the falling edge of DV.
(3) Measured from the 50% point of the falling edge of DV to the data becoming invalid.
(4) Measured between 20% to 80% of logic levels.
7
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