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AD7715AN-5 датащи(PDF) 5 Page - Analog Devices

номер детали AD7715AN-5
подробное описание детали  3 V/5 V, 450 uA 16-Bit, Sigma-Delta ADC
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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AD7715AN-5 датащи(HTML) 5 Page - Analog Devices

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AD7715
–5–
REV. C
TIMING CHARACTERISTICS1, 2
Limit at TMIN, TMAX
Parameter
(A Version)
Unit
Conditions/Comments
fCLKIN
3, 4
400
kHz min
Master Clock Frequency: Crystal Oscillator or Externally Supplied
2.5
MHz max
for Specified Performance
tCLK IN LO
0.4
× t
CLK IN
ns min
Master Clock Input Low Time. tCLK IN = 1/fCLK IN
tCLK IN HI
0.4
× t
CLK IN
ns min
Master Clock Input High Time
t1
500
× t
CLK IN
ns nom
DRDY High Time
t2
100
ns min
RESET Pulsewidth
Read Operation
t3
0
ns min
DRDY to CS Setup Time
t4
120
ns min
CS Falling Edge to SCLK Rising Edge Setup Time
t5
5
0
ns min
SCLK Falling Edge to Data Valid Delay
80
ns max
DVDD = +5 V
100
ns max
DVDD = +3.3 V
t6
100
ns min
SCLK High Pulsewidth
t7
100
ns min
SCLK Low Pulsewidth
t8
0
ns min
CS Rising Edge to SCLK Rising Edge Hold Time
t9
6
10
ns min
Bus Relinquish Time after SCLK Rising Edge
60
ns max
DVDD = +5 V
100
ns max
DVDD = +3.3 V
t10
100
ns max
SCLK Falling Edge to
DRDY High7
Write Operation
t11
120
ns min
CS Falling Edge to SCLK Rising Edge Setup Time
t12
30
ns min
Data Valid to SCLK Rising Edge Setup Time
t13
20
ns min
Data Valid to SCLK Rising Edge Hold Time
t14
100
ns min
SCLK High Pulsewidth
t15
100
ns min
SCLK Low Pulsewidth
t16
0
ns min
CS Rising Edge to SCLK Rising Edge Hold Time
NOTES
1Sample tested at +25
°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of D V
DD) and timed from a voltage level of 1.6 V.
2See Figures 6 and 7.
3CLKIN Duty Cycle range is 45% to 55%. CLKIN must be supplied whenever the AD7715 is not in Standby mode. If no clock is present in this case, the
device can draw higher current than specified and possibly become uncalibrated.
4The AD7715 is production tested with f
CLKIN at 2.4576 MHz (1 MHz for some IDD tests). It is guaranteed by characterization to operate at 400 kHz.
5These numbers are measured with the load circuit of Figure 1 and defined as the time required for the output to cross the V
OL or VOH limits.
6These numbers are derived from the measured time taken by the data output to change 0.5 V when loaded with the circuit of Figure 1. The measured number is
then extrapolated back to remove effects of charging or discharging the 50 pF capacitor. This means that the times quoted in the timing characteristics are the
true bus relinquish times of the part and as such are independent of external bus loading capacitances.
7
DRDY returns high after the first read from the device after an output update. The same data can be read again, if required, while DRDY is high although care
should be taken that subsequent reads do not occur close to the next output update.
Specifications subject to change without notice.
TO
OUTPUT
PIN
+1.6V
ISINK (800 A AT DVDD = 5V
100 A AT DVDD = 3.3V)
50pF
ISOURCE (200 A AT DVDD = 5V
100 A AT DVDD = 3.3V)
Figure 1. Load Circuit for Access Time and Bus Relinquish Time
(DVDD = +3 V to +5.25 V; AVDD = +3 V to +5.25 V; AGND = DGND = 0 V; fCLKIN = 2.4576 MHz;
Input Logic 0 = 0 V, Logic 1 = DVDD, unless otherwise noted)


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