Datasheet LTC1091, LTC1092, LTC1093, LTC1094 (Analog Devices) - 4

LTC1091/LTC1092 LTC1093/LTC1094
AC CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. (Note 3) LTC1091A/LTC1092A/LTC1093A/LTC1094A LTC1091/LTC1092/LTC1093/LTC1094 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
tSMPL Analog Input Sample Time See Operating Sequence 1.5 CLK Cycles tCONV Conversion Time See Operating Sequence 10 CLK Cycles tdDO Delay Time, CLK↓ to DOUT Data Valid See Test Circuits ● 400 850 ns tdis Delay Time, CS↑ to DOUT Hi-Z See Test Circuits ● 180 450 ns ten Delay Time, CLK↓ to DOUT Enabled See Test Circuits ● 160 450 ns thDO Time Output Data Remains Valid After SCLK↓ 150 ns tf DOUT Fall Time See Test Circuits ● 90 300 ns tr DOUT Rise Time See Test Circuits ● 60 300 ns CIN Input Capacitance Analog Inputs On-Channel 65 pF Analog Inputs Off-Channel 5 pF Digital Inputs 5 pF
U DIGITAL A D DC ELECTRICAL CH C ARA TER S I TICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. (Note 3) LTC1091A/LTC1092A/LTC1093A/LTC1094A LTC1091/LTC1092/LTC1093/LTC1094 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, IOUT = 10µA 4.7 V VCC = 4.75V, IOUT = 360µA ● 2.4 4.0 V VOL Low Level Output Voltage VCC = 4.75V, IOUT = 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 LTC1091, CS High ● 1.5 3.5 mA LTC1092/LTC1093/LTC1094, CS High, REF + Open ● 1.0 2.5 mA IREF Reference Current LTC1092/LTC1093/LTC1094, VREF = 5V ● 0.5 1.0 mA I – Negative Supply Current LTC1093/LTC1094, CS High, V – = – 5V ● 1 50 µA
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 6:
Total unadjusted error includes offset, full scale, linearity, of a device may be impaired. multiplexer and hold step errors.
Note 2:
All voltage values are with respect to ground with DGND, AGND,
Note 7:
Two on-chip diodes are tied to each reference and analog input GND and REF– wired together (unless otherwise noted). REF– is internally which will conduct for reference or analog input voltages one diode drop connected to the AGND pin on the LTC1093. DGND, AGND, REF– and V– below V – or one diode drop above VCC. Be careful during testing at low are internally connected to the GND pin on the LTC1091/LTC1092. VCC levels (4.5V), as high level reference or analog inputs (5V) can cause
Note 3:
V + – this input diode to conduct, especially at elevated temperatures, and cause CC = 5V, VREF = 5V, VREF = 0V, V – = 0V for unipolar mode and – 5V for bipolar mode, CLK = 0.5MHz unless otherwise specified. errors for inputs near full scale. This spec allows 50mV forward bias of either diode. This means that as long as the reference or analog input does
Note 4:
These specs apply for both unipolar (LTC1091/LTC1092/LTC1093/ not exceed the supply voltage by more than 50mV, the output code will be LTC1094) and bipolar (LTC1093/LTC1094 only) modes. In bipolar mode, correct. To achieve an absolute 0V to 5V input voltage range will therefore one LSB is equal to the bipolar input span (2VREF) divided by 1024. For require a minimum supply voltage of 4.950V over initial tolerance, example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/1024 = 9.77mV. temperature variations and loading.
Note 5:
Linearity error is specified between the actual end points of the
Note 8:
Channel leakage current is measured after the channel selection. A/D transfer curve. 4