AD8021 datasheet(5/28 Pages) AD

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Data Sheet

AD5444/AD5446

Rev. E | Page 5 of 28

TIMING CHARACTERISTICS

All input signals are specified with tr = tf = 1 ns (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2. VDD = 2.5 V to 5.5 V,

VREF = 10 V, IOUT2 = 0 V, temperature range for Y version: −40°C to +125°C; all specifications TMIN to TMAX, unless otherwise noted.

Table 2.

Parameter1

VDD = 4.5 V to

5.5 V

VDD = 2.5 V to

5.5 V

Unit

Conditions/Comments

fSCLK

MHz max

Maximum clock frequency.

ns min

SCLK cycle time.

ns min

SCLK high time.

ns min

SCLK low time.

ns min

SYNC falling edge to SCLK active edge setup time.

ns min

Data setup time.

4.5

ns min

Data hold time.

ns min

SYNC rising edge to SCLK active edge setup time

ns min

Minimum SYNC high time.

ns min

SCLK active edge to SDO valid.

Update Rate

2.7

MSPS

Consists of cycle time, SYNC high time, data setup time and output

voltage settling time.

1 Guaranteed by design and characterization; not subject to production test.

DB15

DB0

SCLK

SYNC

SDIN

Figure 2. Standalone Timing Diagram

DB15 (N)

DB0 (N)

DB15

(N + 1)

DB0

(N + 1)

SCLK

SDIN

SDO

NOTES

ALTERNATIVELY, DATA CAN BE CLOCKED INTO INPUT SHIFT REGISTER ON RISING EDGE OF SCLK AS

DETERMINED BY CONTROL BITS. IN THIS CASE, DATA IS CLOCKED OUT OF SDO ON FALLING

EDGE OF SCLK. TIMING AS ABOVE, WITH SCLK INVERTED.

DB15 (N)

DB0 (N)

SYNC

Figure 3. Daisy-Chain Timing Diagram

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