DAC0890 datasheet(3/12 Pages) NSC

3 / 12 page

Electrical Characteristics (Continued)

The following specifications apply for Va ea5V and Va ea15V and AGND e DGND e 0V unless otherwise specified

Boldface limits apply for TA e TJ e TMIN to TMAX all other limits TA e TJ e 25 C

Symbol

Parameter

Conditions

(Note 7)

Typical

Limit

Units

(Note 8)

VIHC

Control Logic High

V (min)

Threshold

Digital Input Current

(Note 17)

A (max)

tWR

Write Time

ns (min)

tDS

Data Setup Time

ns (min)

tDH

Data Hold Time

ns (max)

tCS

Control Setup Time

ns (min)

tCH

Control Hold Time

ns (max)

Note 1

Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating

the device beyond its specified operating ratings Operating Ratings indicate conditions for which the device is functional but do not guarantee performance limits

For guaranteed specifications and test conditions see the Electrical Characteristics The guaranteed specifications apply only for the test conditions listed Some

performance characteristics may degrade when the device is not operated under the listed test conditions

Note 2

All voltages are measured with respect to AGND unless otherwise specified

Note 3

When the input voltage (VIN) at any pin exceeds the power supply rails (VIN k AGND or VIN l Va) the absolute value of current at that pin should be

limited to 5 mA or less

Note 4

The sum of the currents at all pins that are driven beyond the power supply voltages should not exceed 20 mA

Note 5

The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX iJA and the ambient temperature TA The maximum

allowable power dissipation at any temperature is PD e (TJMAX -TA) iJA or the number given in the Absolute Maximum Ratings whichever is lower The

TJMAX( C) and iJA( CW) for the DAC0890CIJ are 125 C and 53 CW respectively

Part Number

TJMAX( C)

iJA( CW)

DAC0890CIJ

125

Note 6

Human body model 100 pF discharged through a 15 kX resistor

Note 7

Typicals are at 25 C unless otherwise specified and represent the most likely parametric norm

Note 8

Guaranteed to National’s AOQL (Average Outgoing Quality Level)

Note 9

Full Scale DAC-to-DAC Tracking is defined as the change in the voltage difference between the full scale output levels of DAC1 and DAC2 The result is

expressed in LSBs and it referred to the full-scale voltage difference at 25 C

Note 10

Analog Crosstalk is a measure of the change in one DAC’s full scale output voltage as the second DAC’s output voltage changes value It is measured as

the voltage change in one DAC’s full scale output voltage divided by the voltage range through which the second DAC’s output has changed (zero to full scale)

This ratio is then expressed in dB

Note 11

Glitch Energy is a worst case measurement over the entire input code range of transients that occur when changing code The positive and negative

areas of the transient waveforms are summed together to obtain the value listed

Note 12

Digital Feedthrough is measured with both DAC outputs latched at full scale and a 2 ns 5V step applied to all 8 data inputs This gives the worst case

digital feedthrough for the DAC0890

Note 13

Settling Time is specified for a positive full scale step to g

LSB Settling time for negative steps will be slower but may be improved with an external

pull-down resistor Negative settling time to g

LSB can be calculated for each range where tS e 623 (CLOAD)(RLOAD 10 kX) for the high range and tS e623

(CLOAD)(RLOAD 25 kX) for the low range

Note 14

Output Current Drive Capability is the minimum current that can be sourced by the output amplifiers with less than

LSB reduction in full scale Current

sinking capability is provided by a passive internal resistance of 10 kX in the high range and 25 kX in the low range

Note 15

Output Short Circuit Current is measured with the output at full-scale and shorted to AGND

Note 16

Power Supply Rejection Ratio is a measure of how much the output voltage changes (in parts-per-million) per change (in percent) in the power supply

voltage

Note 17

Digital Input Current is measured with 0V and Va input levels The limit specified is the higher of these two measurements

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