AD7294 datasheet(10/48 Pages) AD

10 / 48 page

Data Sheet

AD7294

Rev. I | Page 9 of 47

TIMING CHARACTERISTICS

I2C Serial Interface

AVDD = DVDD = 4.5 V to 5.5 V, AGND = DGND = 0 V, VREF = 2.5 V internal or external; VDRIVE = 2.7 V to 5.5 V; VPP = AVDD to 59.4 V;

DAC OUTV+ AB and DAC OUTV+ CD = 4.5 V to 16.5 V; OFFSET IN x is floating, therefore, DAC output span = 0 V to 5 V; TA =

−40°C to +105°C, unless otherwise noted.

Table 4.

Parameter1

Limit at TMIN, TMAX

Unit

Description

fSCL

400

kHz max

SCL clock frequency

2.5

μs min

SCL cycle time

0.6

μs min

tHIGH, SCL high time

1.3

μs min

tLOW, SCL low time

0.6

μs min

tHD,STA, start/repeated start condition hold time

100

ns min

tSU,DAT, data setup time

0.9

μs max

tHD,DAT, data hold time

μs min

tHD,DAT, data hold time

0.6

μs min

tSU,STA, setup time for repeated start

0.6

μs min

tSU,STO, stop condition setup time

1.3

μs min

tBUF, bus free time between a stop and a start condition

t10

300

ns max

tR, rise time of SCL and SDA when receiving

ns min

tR, rise time of SCL and SDA when receiving (CMOS compatible)

t11

300

ns max

tF, fall time of SDA when transmitting

ns min

tF, fall time of SDA when receiving (CMOS compatible)

300

ns max

tF, fall time of SCL and SDA when receiving

20 + 0.1Cb2

ns min

tF, fall time of SCL and SDA when transmitting

400

pF max

Capacitive load for each bus line

1 See Figure 2.

2 Cb is the total capacitance in pF of one bus line. tR and tF are measured between 0.3 DVDD and 0.7 DVDD.

Timing and Circuit Diagrams

START

CONDITION

REPEATED

START

CONDITION

STOP

CONDITION

t11

t10

SDA

SCL

Figure 2. I2C-Compatible Serial Interface Timing Diagram

50pF

TO OUTPUT PIN

VOH (MIN) OR

VOL (MAX)

200µA

IOL

IOH

Figure 3. Load Circuit for Digital Output

AD7294 Datasheet(PDF) 10 Page - Analog Devices

AD7294 Datasheet(HTML) 10 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 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Datasheet Download

Link URL