Datasheet LTC1290 (Analog Devices) - 5

LTC1290
U DIGITAL A D DC ELECTRICAL CH C ARA TER S I TICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. (Note 3) LTC1290B/LTC1290C/LTC1290D SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIH High Level Input Voltage VCC = 5.25V ● 2.0 V VIL Low Level Input Voltage VCC = 4.75V ● 0.8 V IIH High Level Input Current VIN = VCC ● 2.5 µA IIL Low Level Input Current VIN = 0V ● – 2.5 µA VOH High Level Output Voltage VCC = 4.75V IO = 10µA 4.7 V IO = 360µA ● 2.4 4.0 V VOL Low Level Output Voltage VCC = 4.75V IO = 1.6mA ● 0.4 V IOZ High-Z Output Leakage VOUT = VCC, CS High ● 3 µA VOUT = 0V, CS High ● – 3 µA ISOURCE Output Source Current VOUT = 0V –20 mA ISINK Output Sink Current VOUT = VCC 20 mA ICC Positive Supply Current CS High ● 6 12 mA CS High LTC1290BC, LTC1290CC ● 5 10 µA Power Shutdown LTC1290DC, LTC1290BI ACLK Off LTC1290CI, LTC1290DI LTC1290BM, LTC1290CM ● 5 15 µA LTC1290DM
(OBSOLETE)
IREF Reference Current VREF = 5V ● 10 50 µA I– Negative Supply Current CS High ● 1 50 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life VCC levels (4.5V), as high level reference or analog inputs (5V) can cause of a device may be impaired. this input diode to conduct, especially at elevated temperatures and cause errors for inputs near full scale. This spec allows 50mV forward bias of
Note 2:
All voltage values are with respect to ground with DGND, AGND either diode. This means that as long as the reference or analog input does and REF– wired together (unless otherwise noted). not exceed the supply voltage by more than 50mV, the output code will be
Note 3:
VCC = 5V, VREF+ = 5V, VREF – = 0V, V– = 0V for unipolar mode and correct. To achieve an absolute 0V to 5V input voltage range will therefore – 5V for bipolar mode, ACLK = 4.0MHz unless otherwise specified. require a minimum supply voltage of 4.950V over initial tolerance,
Note 4:
These specs apply for both unipolar and bipolar modes. In bipolar temperature variations and loading. mode, one LSB is equal to the bipolar input span (2VREF) divided by 4096.
Note 8:
Channel leakage current is measured after the channel selection. For example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/4096 = 2.44mV.
Note 9:
To minimize errors caused by noise at the chip select input, the
Note 5:
Integral nonlinearity is defined as the deviation of a code from a internal circuitry waits for two ACLK falling edge after a chip select falling straight line passing through the actual endpoints of the transfer curve. edge is detected before responding to control input signals. Therefore, no The deviation is measured from the center of the quantization band. attempt should be made to clock an address in or data out until the
Note 6:
Recommended operating conditions. minimum chip select setup time has elapsed.
Note 7:
Two on-chip diodes are tied to each reference and analog input
Note 10:
Increased leakage currents at elevated temperatures cause the which will conduct for reference or analog input voltages one diode drop S/H to droop, therefore it's recommended that fACLK ≥ 125kHz at 85°C and below V – or one diode drop above VCC. Be careful during testing at low fACLK ≥ 15kHz at 25°C. 1290fe 5