LTC1863/LTC1867
5
18637fc
For more information www.linear.com/LTC1863
TIMING CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS
LTC1863/LTC1867/LTC1867A
UNITSMIN TYP MAX
f
SAMPLE
Maximum Sampling Frequency
l
200 kHz
t
CONV
Conversion Time
l
3 3.5 µs
t
ACQ
Acquisition Time
l
1.5 1.1 µs
f
SCK
SCK Frequency 40 MHz
t
1
CS/CONV High Time Short CS/CONV Pulse Mode
l
40 100 ns
t
2
SDO Valid After SCK↓ C
L
= 25pF (Note 11)
l
13 22 ns
t
3
SDO Valid Hold Time After SCK↓ C
L
= 25pF
l
5 11 ns
t
4
SDO Valid After CS/CONV↓ C
L
= 25pF
l
10 30 ns
t
5
SDI Setup Time Before SCK↑
l
15 –6 ns
t
6
SDI Hold Time After SCK↑
l
10 4 ns
t
7
SLEEP Mode Wake-Up Time C
REFCOMP
= 10µF, C
VREF
= 2.2µF 60 ms
t
8
Bus Relinquish Time After CS/CONV↑ C
L
= 25pF
l
20 40 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 V
DD
, 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 V
DD
.
Note 5: V
DD
= 5V, f
SAMPLE
= 200ksps at 25°C, t
r
= t
f
= 5ns and
V
IN
– = 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 V
IN
– = 2.5V.
Note 10: Guaranteed by design, not subject to test.
Note 11: t
2
of 25ns maximum allows f
SCK
up to 20MHz for rising capture
with 50% duty cycle and f
SCK
up to 40MHz for falling capture (with 3ns
setup time for the receiving logic).
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
