AD7729 Analog Devices, AD7729 Datasheet - Page 4

• Manufacturer Part Number: AD7729
• Description: 3 V, Dual Sigma-Delta ADC with Auxiliary DAC
• Manufacturer: Analog Devices

Specifications of AD7729

• Resolution (bits): 15bit
• # Chan: 2
• Sample Rate: 13MSPS
• Interface: Ser
• Analog Input Type: Diff-Uni,SE-Uni
• Ain Range: (2Vref) p-p
• Adc Architecture: Sigma-Delta
• Pkg Type: SOIC,SOP

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