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AD7707 Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer AD7707
Bauteilbeschribung  3-Channel 16-Bit, Sigma-Delta ADC
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7707 Datenblatt(HTML) 8 Page - Analog Devices

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AD7707
Rev. B | Page 8 of 52
TIMING CHARACTERISTICS
AVDD = DVDD = 2.7 V to 5.25 V, AGND = DGND = 0 V; fCLKIN = 2.4576 MHz; input logic = 0, Logic 1 = DVDD, unless otherwise noted.
Table 4.
Parameter1, 2
Limit at TMIN, TMAX
(B Version)
Unit
Conditions/Comments
fCLKIN3, 4
400
kHz min
Master clock frequency: crystal oscillator or externally supplied for specified performance
5
MHz max
tCLKIN LO
0.4 × tCLKIN
ns min
Master clock input low time, tCLKIN = 1/fCLKIN
tCLKIN HI
0.4 × tCLKIN
ns min
Master clock input high time
t1
500 × tCLKIN
ns nom
DRDY high time
t2
100
ns min
RESET pulse width
Read Operation
t3
0
ns min
DRDY to CS setup time
t4
120
ns min
CS falling edge to SCLK rising edge setup time
t55
0
ns min
SCLK falling edge to data valid delay
80
ns max
DVDD = 5 V
100
ns max
DVDD = 3.0 V
t6
100
ns min
SCLK high pulse width
t7
100
ns min
SCLK low pulse width
t8
0
ns min
CS rising edge to SCLK rising edge hold time
t96
10
ns min
Bus relinquish time after SCLK rising edge
60
ns max
DVDD = 5 V
100
ns max
DVDD = 3.0 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 pulse width
t15
100
ns min
SCLK low pulse width
t16
0
ns min
CS rising edge to SCLK rising edge hold time
1 Sample tested at +25°C 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 20 and Figure 21.
3 fCLKIN duty cycle range is 45% to 55%. fCLKIN must be supplied whenever the AD7707 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.
4 The AD7707 is production tested with fCLKIN at 2.4576 MHz (1 MHz for some IDD tests). It is guaranteed by characterization to operate at 400 kHz.
5 These numbers are measured with the load circuit of Figure 2 and defined as the time required for the output to cross the VOL or VOH limits.
6 These numbers are derived from the measured time taken by the data output to change 0.5 V when loaded with the circuit of Figure 2. 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.
TO OUTPUT
PIN
50pF
ISINK (800µA AT VDD = 5V
100µA AT VDD = 3V)
1.6V
ISOURCE (200µA AT VDD = 5V
100µA AT VDD = 3V)
Figure 2. Load Circuit for Access Time and Bus Relinquish Time


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