DS4424 datasheet(3/10 Pages) MAXIM

3 / 10 page

Two-/Four-Channel, I2C, 7-Bit Sink/Source

Current DAC

_______________________________________________________________________________________

Note 1:

All voltages with respect to ground. Currents entering the IC are specified positive, and currents exiting the IC are negative.

Note 2:

Input resistors (RFS) must be between the speciifed values to ensure the device meets its accuracy and linearity specifications.

Note 3:

Supply current specified with all outputs set to zero current setting. A0 and A1 are connected to GND. SDA and SCL are con-

nected to VCC. Excludes current through RFS resistors (IRFS). Total current including IRFS is ICC + (2 x IRFS).

Note 4:

The output-voltage range must be satisfied to ensure the device meets its accuracy and linearity specifications.

Note 5:

Temperature drift excludes drift caused by external resistor.

Note 6:

Differential linearity is defined as the difference between the expected incremental current increase with respect to position

and the actual increase. The expected incremental increase is the full-scale range divided by 127.

Note 7:

Guaranteed by design.

Note 8:

Integral linearity is defined as the difference between the expected value as a function of the setting and the actual value.

The expected value is a straight line between the zero and the full-scale values proportional to the setting.

Note 9:

Timing shown is for fast-mode (400kHz) operation. This device is also backward compatible with I2C standard-mode timing.

Note 10: CB—total capacitance of one bus line in pF.

OUTPUT CURRENT SOURCE CHARACTERISTICS (continued)

(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DC source

0.32

Output Current Variation Due to

Power-Supply Change

DC sink

0.42

%/V

DC source, VOUT measure at 1.2V

0.16

Output Current Variation Due to

Output-Voltage Change

DC sink, VOUT measure at 1.2V

0.16

%/V

Output Leakage Current at Zero

Current Setting

IZERO

-1

μA

Output Current Differential

Linearity

DNL

(Notes 6, 7)

-0.5

+0.5

LSB

Output Current Integral Linearity

INL

(Notes 7, 8)

-1

LSB

AC ELECTRICAL CHARACTERISTICS

(VCC = +2.7V to +5.5V, TA = -40°C to +85°C.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Clock Frequency

fSCL

(Note 9)

400

kHz

Bus Free Time Between STOP

and START Conditions

tBUF

1.3

μs

Hold Time (Repeated) START

Condition

tHD:STA

0.6

μs

Low Period of SCL

tLOW

1.3

μs

High Period of SCL

tHIGH

0.6

μs

Data Hold Time

tDH:DAT

0.9

μs

Data Setup Time

tSU:DAT

100

START Setup Time

tSU:STA

0.6

μs

SDA and SCL Rise Time

(Note 10)

20 + 0.1CB

300

SDA and SCL Fall Time

(Note 10)

20 + 0.1CB

300

STOP Setup Time

tSU:STO

0.6

μs

SDA and SCL Capacitive

(Note 10)

400

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