Datasheet LTC1090 (Analog Devices) - 4

LTC1090
U DIGITAL A D DC ELECTRICAL CHARACTERISTICS The
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denotes specifications which apply over the full operating temperature range, otherwise specification are TA = 25
°
C. (Note 3) LTC1090/LTC1090A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH High Level lnput Voltage VCC = 5.25V ● 2.0 V VIL Low Level Input Voltage VCC = 4.75V ● 0.8 V IIH High Level lnput Current VIN = VCC ● 2.5 µA IIL Low Level Input Current VIN = 0V ● –2.5 µA VOH High Level Output Voltage VCC = 4.75V, lO = 10µA 4.7 V VCC = 4.75V, lO = 360µA ● 2.4 4.0 V VOL Low Level Output Voltage VCC = 4.75V, lO = 1.6mA ● 0.4 V IOZ Hi-Z Output Leakage VOUT = VCC, CS High ● 3 µA VOUT = 0V, CS High ● –3 µA ISOURCE Output Source Current VOUT = 0V –10 mA ISINK Output Sink Current VOUT = VCC 10 mA ICC Positive Supply Current CS High, REF+ Open ● 1.0 2.5 mA IREF Reference Current VREF = 5V ● 0.5 1.0 mA I– Negative Supply Current CS High, V– = – 5V ● 1 50 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life below V– or one diode drop above VCC. Be careful during testing at low of a device may be impaired. VCC levels (4.5V), as high level reference or analog inputs (5V) can cause
Note 2:
All voltage values are with respect to ground with DGND, AGND this input diode to conduct, especially at elevated temperatures, and cause and REF– wired together (unless otherwise noted). errors for inputs near full-scale. This spec allows 50mV forward bias of
Note 3:
VCC = 5V, VREF + = 5V, VREF – = 0V, V– = 0V for unipolar mode and either diode. This means that as long as the reference or analog input does –5V for bipolar mode, ACLK = 2.0MHz, SCLK = 0.5MHz unless otherwise not exceed the supply voltage by more than 50mV, the output code will be specified. correct. To achieve an absolute 0V to 5V input voltage range will therefore
Note 4:
These specs apply for both unipolar and bipolar modes. In bipolar require a minimum supply voltage of 4.950V over initial tolerance, mode, one LSB is equal to the bipolar input span (2VREF) divided by 1024. temperature variations and loading. For example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/1024 = 9.77mV.
Note 8:
Channel leakage current is measured after the channel selection.
Note 5:
Linearity error is specified between the actual end points of the
Note 9:
To minimize errors caused by noise at the chip select input, the A/D transfer curve. internal circuitry waits for two ACLK falling edges after a chip select falling
Note 6:
Total unadjusted error includes offset, gain, linearity, multiplexer edge is detected before responding to control input signals. Therefore, no and hold step errors. attempt should be made to clock an address in or data out until the
Note 7:
Two on-chip diodes are tied to each reference and analog input minimum chip select setup time has elapsed. which will conduct for reference or analog input voltages one diode drop 1090fc 4