Datasheet LTC1282 (Analog Devices) - 4

LTC1282
W U TI I G CHARACTERISTICS (Note 5) LTC1282A/LTC1282B SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
fSAMPLE(MAX) Maximum Sampling Frequency Commercial (Note 13) ● 140 kHz Military (Note 13) ● 120 kHz tCONV Conversion Time Commercial ● 6.0 µs Military ● 6.5 µs t1 CS to RD Setup Time ● 0 ns t2 RD↓ to BUSY↓ Delay CL = 50pF 140 200 ns Commercial ● 230 ns Military ● 260 ns t3 Data Access Time After RD↓ CL = 20pF (Note 13) 100 180 ns Commercial ● 200 ns Military ● 220 ns CL = 100pF (Note 13) 110 200 ns Commercial ● 240 ns Military ● 260 ns t4 RD Pulse Width (Note 13) ● t3 ns t5 CS to RD Hold Time (Note 13) ● 0 ns t6 Data Setup Time After BUSY↑ (Note 13) 60 85 ns Commercial ● 110 ns Military ● 120 ns t7 Bus Relinquish Time (Note 13) 40 60 120 ns Commercial ● 40 130 ns Military ● 40 150 ns t8 HBEN to RD Setup Time (Note 13) ● 0 ns t9 HBEN to RD Hold Time (Note 13) ● 0 ns t10 Delay Between RD Operations ● 40 ns t11 Delay Between Conversions Commercial (Note 13) ● 1140 450 ns Military (Note 13) ● 1500 ns t12 Aperture Delay of Sample-and-Hold 30 ns The ● indicates specifications which apply over the full operating
Note 8:
Bipolar offset is the different voltage measured from – 0.5LSB temperature range; all other limits and typicals TA = 25°C. when the output code flickers between 0000 0000 0000 and 1111 1111 1111.
Note 1:
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 9:
Full-scale change when VSS = 0V (Unipolar Mode) or – 3V (Bipolar Mode).
Note 2:
All voltage values are with respect to ground with DGND and AGND wired together (unless otherwise noted).
Note 10:
Full-scale change when VDD = 3V.
Note 3:
When these pin voltages are taken below VSS or above VDD, they
Note 11:
The LTC1282 can perform unipolar and bipolar conversions. will be clamped by internal diodes. This product can handle input currents When VSS is grounded (i.e. – 0.1V ≤ VSS), the ADC will convert in unipolar greater than 60mA below VSS or above VDD without latchup. mode with input voltage of 0V to 2.5V. When VSS is taken negative (i.e. VSS
Note 4:
When these pin voltages are taken below V ≤ –2.5V), the ADC will convert in bipolar mode with an input voltage of SS they will be clamped by internal diodes. This product can handle input currents greater than ±1.25V. AIN must not exceed VDD or fall below VSS by more than 50mV for specified accuracy. 60mA below VSS without latchup. These pins are not clamped to VDD.
Note 12:
Guaranteed by design, not subject to test.
Note 5:
VDD = 3V, VSS = 0V for unipolar mode and VSS = – 3V for bipolar mode, fSAMPLE = 140kHz, tr = tf = 5ns unless otherwise specified.
Note 13:
Recommended operating conditions.
Note 6:
Linearity, offset and full-scale specifications apply for unipolar and
Note 14:
Commercial grade parts are designed to operate over the bipolar modes. temperature range of – 40°C to 85°C but are neither tested nor guaranteed beyond 0
Note 7:
Integral nonlinearity is defined as the deviation of a code from a °C to 70°C. Industrial grade parts specified and tested over – 40 straight line passing through the actual endpoints of the transfer curve. °C to 85°C are available on special request. Consult factory. The deviation is measured from the center of the quantization band. 4