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AD7781BRUZ Datenblatt(PDF) 5 Page - Analog Devices

Teilenummer AD7781BRUZ
Bauteilbeschribung  20-Bit, Pin-Programmable, Low Power Sigma-Delta ADC
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
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AD7781BRUZ Datenblatt(HTML) 5 Page - Analog Devices

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AD7781
Rev. 0 | Page 5 of 16
TIMING CHARACTERISTICS
AVDD = 2.7 V to 5.25 V, DVDD = 2.7 V to 5.25 V, GND = 0 V, Input Logic 0 = 0 V, Input Logic 1 = DVDD, unless otherwise noted.
Table 3.
Parameter1
Limit at TMIN, TMAX
Unit
Test Conditions/Comments
Read2
t1
100
ns min
SCLK high pulse width
t2
100
ns min
SCLK low pulse width
t33
0
ns min
SCLK active edge to data valid delay4
60
ns max
DVDD = 4.75 V to 5.25 V
80
ns max
DVDD = 2.7 V to 3.6 V
t4
10
ns min
SCLK inactive edge to DOUT/RDY high
130
ns max
Reset
t5
100
ns min
PDRST low pulse width
t65
FILTER/GAIN change to data valid delay
120
ms typ
Update rate = 16.7 Hz
300
ms typ
Update rate = 10 Hz
1 Sample tested during initial release to ensure compliance. All input signals are specified with tR = tF = 5 ns (10% to 90% of DVDD) and timed from a voltage level of 1.6 V.
2 See Figure 3.
3 The values of t3 are measured using the load circuit of Figure 2 and are defined as the time required for the output to cross the VOL or VOH limits.
4 SCLK active edge is falling edge of SCLK.
5 The PDRST high to data valid delay is typically 1 ms longer than t6 because the internal oscillator requires time to power up and settle.
Circuit and Timing Diagrams
ISINK (1.6mA WITH DVDD = 5V,
100µA WITH DVDD = 3V)
ISOURCE (200µA WITH DVDD = 5V,
100µA WITH DVDD = 3V)
1.6V
TO
OUTPUT
PIN
50pF
PDRST
(INPUT)
t5
DOUT/RDY
(OUTPUT)
GAIN OR FILTER
(INPUT)
Figure 2. Load Circuit for Timing Characterization
DOUT/RDY
(OUTPUT)
MSB
LSB
SCLK
(INPUT)
t3
t1
t4
t2
Figure 3. Read Cycle Timing Diagram
Figure 4. Resetting the AD7781
t6
DOUT/RDY
(OUTPUT)
Figure 5. Changing Gain or Filter Option


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