AD7904 Datasheet, PDF (8/24 Pages) Analog Devices – 4-Channel, 1 MSPS, 8-/10-/12-Bit ADCs with Sequencer in 16-Lead TSSOP

AD7904/AD7914/AD7924
TIMING SPECIFICATIONS1
(V_DD = 2.7 V to 5.25 V, V_DRIVE Յ V_DD, REF_IN = 2.5 V, T_A = T_MIN to T_MAX, unless otherwise noted.)
Parameter
f_SCLK2
t_CONVERT
t_QUIET
t₂
t₃₃
t₄₃
t₅
t₆
t₇
t₈₄
t₉
t₁₀
t₁₁
t₁₂
Limit at T_MIN, T_MAX AD7904/AD7914/AD7924
V_DD = 3 V
V_DD = 5 V
Unit
10
20
16 × t_SCLK
50
10
20
16 × t_SCLK
50
kHz min
MHz max
ns min
10
35
40
0.4 × t_SCLK
0.4 × t_SCLK
10
15/45
10
5
20
1
10
30
40
0.4 × t_SCLK
0.4 × t_SCLK
10
15/35
10
5
20
1
ns min
ns max
ns max
ns min
ns min
ns min
ns min/max
ns min
ns min
ns min
µs max
Description
Minimum Quiet Time Required Between CS Rising Edge
and Start of Next Conversion
CS to SCLK Setup Time
Delay from CS until DOUT Three-State Disabled
Data Access Time after SCLK Falling Edge
SCLK Low Pulsewidth
SCLK High Pulsewidth
SCLK to DOUT Valid Hold Time
SCLK Falling Edge to DOUT High Impedance
DIN Setup Time Prior to SCLK Falling Edge
DIN Hold Time after SCLK Falling Edge
Sixteenth SCLK Falling Edge to CS High
Power-Up Time from Full Power-Down/Auto
Shutdown Modes
NOTES
1_{Sample tested at 25°C to ensure compliance. All input signals are specified with tr = tf = 5 ns (10% to 90% of V DD) and timed from a voltage level of 1.6 V.}
See Figure 1. 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 1 and defined as the time required for the output to cross 0.4 V or 0.7 × VDRIVE.}
4_{t8 is derived form the measured time taken by the data outputs to change 0.5 V when loaded with the circuit of Figure 1. The measured number is then extrapolated}
back to remove the effects of charging or discharging the 50 pF capacitor. This means that the time, t ₈, quoted in the timing characteristics is the true bus relinquish
time of the part and is independent of the bus loading.
Specifications subject to change without notice.
–8–
REV. 0