參數(shù)資料
型號: AD1556
廠商: Analog Devices, Inc.
英文描述: 24-Bit ADC WITH LOW NOISE PGA
中文描述: 24位ADC與低噪聲PGA巡回
文件頁數(shù): 5/24頁
文件大?。?/td> 429K
代理商: AD1556
REV. B
–5–
AD1555/AD1556
TIMING SPECIFICATIONS
Symbol
Min
Typ
Max
Unit
CLKIN Frequency
1
CLKIN Duty Cycle Error
MCLK Output Frequency
1
f
CLKIN
0.975
45
1.024
1.075
55
MHz
%
f
CLKIN
/4
SYNC Setup Time
SYNC Hold Time
CLKIN Rising to MCLK Output Falling on SYNC
CLKIN Falling to MCLK Output Rising
CLKIN Falling to MCLK Output Falling
MCLK Input Falling to MDATA Falling
MCLK Input Rising to MDATA and MFLG Valid
TDATA Setup Time after SYNC
TDATA Hold Time
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
t
13
t
14
t
15
t
16
t
17
t
18
t
19
t
20
t
21
t
22
t
23
t
24
t
25
t
26
t
27
t
28
t
29
t
30
t
31
t
32
t
33
10
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
20
20
20
30
100
5
5
RESET Setup Time
RESET Hold Time
15
15
ns
ns
CLKIN Falling to DRDY Rising
CLKIN Rising to DRDY Falling
2
CLKIN Rising to
ERROR
Falling
20
20
50
ns
ns
ns
RSEL to Data Valid
RSEL Setup to SCLK Falling
DRDY to Data Valid
DRDY High Setup to SCLK Falling
R/
W
to Data Valid
R/
W
High Setup to SCLK Falling
CS
to Data Valid
CS
Low Setup to SCLK Falling
SCLK Rising to DOUT Valid
SCLK High Pulsewidth
SCLK Low Pulsewidth
SCLK Period
SCLK Falling to DRDY Falling
2
CS
High or R/
W
Low to DOUT Hi-Z
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
10
25
10
25
10
25
10
25
25
25
70
20
20
R/
W
Low Setup to SCLK Falling
CS
Low Setup to SCLK Falling
Data Setup Time to SCLK Falling
Data Hold Time after SCLK Falling
R/
W
Hold Time after SCLK Falling
10
10
10
10
10
ns
ns
ns
ns
ns
NOTES
1
The gain of the modulator is proportional to f
and MCLK frequency.
2
With DRDYBUF low only. When DRDYBUF is high, this timing also depends on the value of the external pull-down resistor.
Specifications subject to change without notice.
(+V
A
= +5 V 5%; –V
A
= –5 V 5%; AD1555 V
L
= 5 V
5%, AD1556 V
L
= 2.85 V to 5.25 V;
CLKIN = 1.024 MHz; AGND = DGND = 0 V; C
L
= 50 pF; T
A
= T
MIN
to T
MAX
, unless otherwise noted)
I
OH
I
OL
TO OUTPUT
PIN
1.4V
C
L
50pF
500 A
1.6mA
Figure 2. Load Circuit for Digital Interface Timing
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