Datasheet

PARAMETER MEASUREMENT INFORMATION
CLKOUT
OUTx
t
C1
t
W2
t
D4
t
D3
t
C2
t
W1
t
D1
t
D2
CLKIN
TIMING REQUIREMENTS: 5.0V
(1)
TIMING REQUIREMENTS: 3.0V
(1)
ADS1204
SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 ........................................................................................................................................... www.ti.com
Figure 1. ADS1204 Timing Diagram
Over recommended operating free-air temperature range at – 40 ° C to +105 ° C, AV
DD
= 5V, and BV
DD
= 5V, unless otherwise
noted.
PARAMETER MIN MAX UNIT
t
C1
CLKIN period 41.6 1000 ns
t
W1
CLKIN high time 10 t
C1
– 10 ns
t
C2
CLKOUT period using internal oscillator (CLKSEL = 1) 83 125 ns
CLKOUT period using external clock (CLKSEL = 0) 2 × t
C1
ns
t
W2
CLKOUT high time (t
C2
/2) – 5 (t
C2
/2) + 5 ns
t
D1
CLKOUT rising edge delay after CLKIN rising edge 0 10 ns
t
D2
CLKOUT falling edge delay after CLKIN rising edge 0 10 ns
t
D3
Data valid delay after rising edge of CLKOUT (CLKSEL = 1) (t
C2
/4) – 8 (t
C2
/4) + 8 ns
t
D4
Data valid delay after rising edge of CLKOUT (CLKSEL = 0) t
W1
– 3 t
W1
+ 7 ns
(1) Applicable for 5.0V nominal supply: BV
DD
(min) = 4.5V and BV
DD
(max) = 5.5V. All input signals are specified with t
R
= t
F
= 5ns (10% to
90% of BV
DD
) and timed from a voltage level of (V
IL
+ V
IH
)/2. See Figure 1 .
Over recommended operating free-air temperature range at – 40 ° C to +105 ° C, AV
DD
= 5V, and BV
DD
= 5V, unless otherwise
noted.
PARAMETER MIN MAX UNIT
t
C1
CLKIN period 41.6 1000 ns
t
W1
CLKIN high time 10 t
C1
– 10 ns
t
C2
CLKOUT period using internal oscillator (CLKSEL = 1) 83 125 ns
CLKOUT period using external clock (CLKSEL = 0) 2 × t
C1
ns
t
W2
CLKOUT high time (t
C2
/2) – 5 (t
C2
/2) + 5 ns
t
D1
CLKOUT rising edge delay after CLKIN rising edge 0 10 ns
t
D2
CLKOUT falling edge delay after CLKIN rising edge 0 10 ns
t
D3
Data valid delay after rising edge of CLKOUT (CLKSEL = 1) (t
C2
/4) – 8 (t
C2
/4) + 8 ns
t
D4
Data valid delay after rising edge of CLKOUT (CLKSEL = 0) t
W1
– 3 t
W1
+ 7 ns
(1) Applicable for 3.0V nominal supply: BV
DD
(min) = 2.7V and BV
DD
(max) = 3.6V. All input signals are specified with t
R
= t
F
= 5ns (10% to
90% of BV
DD
) and timed from a voltage level of (V
IL
+ V
IH
)/2. See Figure 1 .
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