AD7729
–4– REV. 0
TIMING CHARACTERISTICS
Limit at
Parameter T
A
= –40ⴗC to +105ⴗC Units Description
AUXILIARY FUNCTIONS
Clock Signals See Figure 2.
t
1
76 ns min MCLK Period
t
2
30.4 ns min MCLK Width Low
t
3
30.4 ns min MCLK Width High
t
4
t
1
ns min ASCLK Period. See Figures 4 and 6.
t
5
0.4 × t
1
ns min ASCLK Width Low
t
6
0.4 × t
1
ns min ASCLK Width High
t
10
20 ns min ASDI/ASDIFS Setup Before ASCLK Low
t
11
10 ns min ASDI/ASDIFS Hold After ASCLK Low
t
12
15 ns max ASDOFS Delay from ASCLK High
t
13
0 ns min ASDOFS Hold After ASCLK High
t
14
0 ns min ASDO Hold After ASCLK High
t
15
15 ns max ASDO Delay from ASCLK High
t
16
10 ns min ASDIFS Low to ASDI LSB Read by ASPORT
t
17
t
4
+ 15 ns min Interval Between Consecutive ASDIFS Pulses
Receive Section
Clock Signals See Figures 5 and 7.
t
7
t
1
ns min BSCLK Period
t
8
0.4 × t
1
ns min BSCLK Width Low
t
9
0.4 × t
1
ns min BSCLK Width High
t
18
20 ns min BSDI/BSDIFS Setup Before BSCLK Low
t
19
10 ns min BSDI/BSDIFS HoldAfter BSCLK Low
t
20
15 ns max BSDOFS Delay from BSCLK High
t
21
0 ns min BSDOFS Hold After BSCLK High
t
22
0 ns min BSDO Hold After BSCLK High
t
23
15 ns max BSDO Delay from BSCLK High
t
24
10 ns min BSDIFS Low to ASDI LSB Read by BSPORT
t
25
t
7
+ 15 ns min Interval Between Consecutive BSDIFS Pulses
ASCLK = MCLK/(2 × ASCLKRATE). ASCLKRATE can have a value from 0 . . . 1023. When ASCLKRATE = 0, ASCLK = 13 MHz.
BSCLK = MCLK/(2 × BSCLKRATE). BSCLKRATE can have a value from 0 . . . 1023. When BSCLKRATE = 0, BSCLK = 13 MHz.
Specifications subject to change without notice.
(AVDD1 = AVDD2 = +3 V ⴞ 10%; DVDD1 = DVDD2 = +3 V ⴞ 10%; AGND = DGND = 0 V;
T
A
= T
MIN
to T
MAX
, unless otherwise noted)
Table II. Receive Section Signal Ranges
Baseband Section Signal Range
V
REFCAP
1.3 V ± 5%
V
REFOUT
1.3 V ± 10%
ADC
ADC Signal Range 2 V
REFCAP
V
BIAS
Differential Input V
REFCAP
/2 to (AVDD1 – V
REFCAP
/2)
Single-Ended Input V
REFCAP
to (AVDD1 – V
REFCAP
)
Signal Range
Differential V
BIAS
± V
REFCAP
/2
Single-Ended V
BIAS
± V
REFCAP
Table III. Auxiliary Section Signal Ranges
AUXDAC Signal Range
Output Code
Code 000 2/32 × V
REFCAP
Code 3FF 2 V
REFCAP
