AD7477AARMZ datasheet(8/28 Pages) AD

8 / 28 page

AD7476A/AD7477A/AD7478A

Rev. F | Page 8 of 28

TIMING SPECIFICATIONS

VDD = 2.35 V to 5.25 V; TA = TMIN to TMAX, unless otherwise noted.1

Table 4.

Parameter

Limit at TMIN, TMAX

Unit

Description

fSCLK2

kHz min3

A, B grades

kHz min3

Y grade

MHz max

tCONVERT

16 × tSCLK

AD7476A

14 × tSCLK

AD7477A

12 × tSCLK

AD7478A

tQUIET

ns min

Minimum quiet time required between bus relinquish

and start of next conversion

ns min

Minimum CS pulse width

ns min

CS to SCLK setup time

t34

ns max

Delay from CS until SDATA three-state disabled

t44

ns max

Data access time after SCLK falling edge

0.4 tSCLK

ns min

SCLK low pulse width

0.4 tSCLK

ns min

SCLK high pulse width

t75

SCLK to data valid hold time

ns min

VDD ≤ 3.3 V

9.5

ns min

3.3 V < VDD ≤ 3.6 V

ns min

VDD > 3.6 V

t86

ns max

SCLK falling edge to SDATA high impedance

t7 values also apply to t8 minimum values

ns min

SCLK falling edge to SDATA high impedance

tPOWER-UP7

μs max

Power-up time from full power-down

Guaranteed by characterization. All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V.

Mark/space ratio for the SCLK input is 40/60 to 60/40.

Minimum fSCLK at which specifications are guaranteed.

Measured with the load circuit shown in Figure 2, and defined as the time required for the output to cross 0.8 V or 1.8 V when VDD = 2.35 V, and

0.8 V or 2.0 V for VDD > 2.35 V.

Measured with a 50 pF load capacitor.

t8 is derived from the measured time taken by the data outputs to change 0.5 V when loaded with the circuit shown in Figure 2. The measured number is then

extrapolated back to remove the effects of charging or discharging the 50 pF capacitor. Therefore, the time, t8, quoted in the timing characteristics is the true bus

relinquish time of the part and is independent of the bus loading.

See the Power-Up Time section.

AD7477AARMZ Datasheet(PDF) 8 Page - Analog Devices

AD7477AARMZ Datasheet(HTML) 8 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Datasheet Download

Link URL