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LTC1863CGN

12-/16-Bit, 8-Channel 200ksps ADCs

Linear Technology 

LTC1863/LTC1867

TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature

range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL

fSAMPLE

tCONV

tACQ

fSCK

t1

t2

t3

t4

t5

t6

t7

t8

PARAMETER

Maximum Sampling Frequency

Conversion Time

Acquisition Time

SCK Frequency

CS/CONV High Time

SDO Valid After SCK↓

SDO Valid Hold Time After SCK↓

SDO Valid After CS/CONV↓

SDI Setup Time Before SCK↑

SDI Hold Time After SCK↑

SLEEP Mode Wake-Up Time

Bus Relinquish Time After CS/CONV↑

CONDITIONS

Short CS/CONV Pulse Mode

CL = 25pF (Note 11)

CL = 25pF

CL = 25pF

CREFCOMP = 10µF, CVREF = 2.2µF

CL = 25pF

LTC1863/LTC1867/LTC1867A

MIN

TYP

MAX

l

200

l

3

3.5

l

1.5

1.1

40

l

40

100

l

13

22

l

5

11

l

10

30

l

15

–6

l

10

4

60

l

20

40

UNITS

kHz

µs

µs

MHz

ns

ns

ns

ns

ns

ns

ms

ns

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime

Note 2: All voltage values are with respect to GND (unless otherwise noted).

Note 3: When these pin voltages are taken below GND or above VDD, they

will be clamped by internal diodes. This product can handle input currents

up to 100mA without latchup.

Note 4: When these pin voltages are taken below GND, they will be

clamped by internal diodes. This product can handle input currents up to

100mA below GND without latchup. These pins are not clamped to VDD.

Note 5: VDD = 5V, fSAMPLE = 200ksps at 25°C, tr = tf = 5ns and

VIN– = 2.5V for bipolar mode unless otherwise specified.

Note 6: Linearity, offset and gain error specifications apply for both

unipolar and bipolar modes. The INL and DNL are tested in bipolar mode.

Note 7: Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 8: Unipolar offset is the offset voltage measured from +1/2LSB

when the output code flickers between 0000 0000 0000 0000 and

0000 0000 0000 0001 for LTC1867 and between 0000 0000 0000 and

0000 0000 0001 for LTC1863. Bipolar offset is the offset voltage measured

from –1/2LSB when output code flickers between 0000 0000 0000 0000

and 1111 1111 1111 1111 for LTC1867, and between

0000 0000 0000 and 1111 1111 1111 for LTC1863.

Note 9: Recommended operating conditions. The input range of ±2.048V

for bipolar mode is measured with respect to VIN– = 2.5V.

Note 10: Guaranteed by design, not subject to test.

Note 11: t2 of 25ns maximum allows fSCK up to 20MHz for rising capture

with 50% duty cycle and fSCK up to 40MHz for falling capture (with 3ns

setup time for the receiving logic).

For more information www.linear.com/LTC1863

18637fc

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