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AD7908 Folha de dados(PDF) 9 Page - Analog Devices

Nome de Peças AD7908
Descrição Electrónicos  8-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 20-Lead TSSOP
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

AD7908 Folha de dados(HTML) 9 Page - Analog Devices

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Data Sheet
AD7908/AD7918/AD7928
Rev. E | Page 9 of 28
TIMING SPECIFICATIONS
AVDD = 2.7 V to 5.25 V, VDRIVE ≤ AVDD, REFIN = 2.5 V, TA = TMIN to TMAX, unless otherwise noted.1
Table 4.
Limit at TMIN, TMAX AD7908/AD7918/AD7928
Parameter
AVDD = 3 V
AVDD = 5 V
Unit
Description
fSCLK2
10
10
kHz min
20
20
MHz max
tCONVERT
16 × tSCLK
16 × tSCLK
tQUIET
50
50
ns min
Minimum quiet time required between CS rising edge and start of
next conversion
t2
10
10
ns min
CS to SCLK setup time
t33
35
30
ns max
Delay from CS until DOUT three-state disabled
t43
40
40
ns max
Data access time after SCLK falling edge
t5
0.4 × tSCLK
0.4 × tSCLK
ns min
SCLK low pulse width
t6
0.4 × tSCLK
0.4 × tSCLK
ns min
SCLK high pulse width
t7
10
10
ns min
SCLK to DOUT valid hold time
t84
15/45
15/35
ns min/max
SCLK falling edge to DOUT high impedance
t9
10
10
ns min
DIN setup time prior to SCLK falling edge
t10
5
5
ns min
DIN hold time after SCLK falling edge
t11
20
20
ns min
16th SCLK falling edge to CS high
t12
1
1
μs max
Power-up time from full power-down/auto shutdown mode
1
Sample tested at 25°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of AVDD) and timed from a voltage level of 1.6 V. See Figure 2.
The 3 V operating range spans from 2.7 V to 3.6 V. The 5 V operating range spans from 4.75 V to 5.25 V.
2
Mark/space ratio for the SCLK input is 40/60 to 60/40.
3
Measured with the load circuit of Figure 2 and defined as the time required for the output to cross 0.4 V or 0.7 × VDRIVE.
4
t8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 2. The measured number is then extrapolated
back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t8, quoted in the timing characteristics is the true bus relinquish
time of the part and is independent of the bus loading.
TO
OUTPUT
PIN
50pF
IOH
IOL
CL
200µA
200µA
1.6V
Figure 2. Load Circuit for Digital Output Timing Specifications


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