LTC1857 LINEAR [Linear Integrated Systems], LTC1857 Datasheet - Page 5

• Manufacturer Part Number: LTC1857
• Description: 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown
• Manufacturer: LINEAR [Linear Integrated Systems]

Note 1: Absolute maximum ratings are those values beyond which the life
of a device may be impaired.
Note 2: All voltage values are with respect to ground with DGND, AGND1,
AGND2 and AGND3 wired together unless otherwise noted.
Note 3: When these pin voltages are taken below ground or above AV
DV
can handle currents of greater than 100mA below ground or above V
without latchup.
Note 4: When these pin voltages are taken below ground they will be
clamped by internal diodes. This product can handle currents of greater
than 100mA below ground without latchup. These pins are not clamped
to V
Note 5: V
specified.
Note 6: Linearity, offset and full-scale specifications apply for a single-
ended analog MUX input with respect to ground or ADC
ADC
Note 7: Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual end points of the transfer curve.
The deviation is measured from the center of the quantization band.
TI I G CHARACTERISTICS
range, otherwise specifications are at T
SYMBOL
f
t
t
f
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
SAMPLE(MAX)
CONV
ACQ
SCK
r
f
1
2
3
4
5
6
7
8
9
10
11
12
13
DD
W
DD
–
= OV
tied to ground.
.
DD
U
DD
= 5V, f
= V
PARAMETER
Maximum Sampling Frequency
Conversion Time
Acquisition Time
SCK Frequency
SDO Rise Time
SDO Fall Time
CONVST High Time
CONVST to BUSY Delay
SCK Period
SCK High
SCK Low
Delay Time, SCK↓ to SDO Valid
Time from Previous SDO Data Remains
Valid After SCK↓
SDO Valid After RD↓
RD↓ to SCK Setup Time
SDI Setup Time Before SCK↑
SDI Hold Time After SCK↑
SDO Valid Before BUSY↑
Bus Relinquish Time
DD
SAMPLE
, they will be clamped by internal diodes. This product
= 100kHz, t
r
= t
f
= 5ns unless otherwise
A
= 25°C. (Note 5)
+
with respect to
CONDITIONS
Through CH0 to CH7 Inputs
Through ADC
Through CH0 to CH7 Inputs
Through ADC
(Note 14)
See Test Circuits
See Test Circuits
C
C
C
C
RD = Low, C
See Test Circuits
The
L
L
L
L
= 25pF, See Test Circuits
= 25pF, See Test Circuits
= 25pF, See Test Circuits
= 25pF, See Test Circuits
●
denotes the specifications which apply over the full operating temperature
DD
DD
L
+
+
= 25pF, See Test Circuits
=
, ADC
, ADC
–
–
Only
Only
Note 8: Bipolar zero error is the offset voltage measured from – 0.5LSB
when the output code flickers between 0000 0000 0000 0000 and 1111
1111 1111 1111 for the LTC1859, between 00 0000 0000 0000 and 11
1111 1111 1111 for the LTC1858 and between 0000 0000 0000 and 1111
1111 1111 for the LTC1857. Unipolar zero error is the offset voltage
measured from 0.5LSB when the output codes flicker between 0000 0000
0000 0000 and 0000 0000 0000 0001 for the LTC1859, between 00 0000
0000 0000 and 00 0000 0000 0001 for the LTC1858 and between 0000
0000 0000 and 0000 0000 0001 for the LTC1857.
Note 9: Guaranteed by design, not subject to test.
Note 10: Recommended operating conditions.
Note 11: Full-scale bipolar error is the worst case of –FS or +FS
untrimmed deviation from ideal first and last code transitions, divided by
the full-scale range, and includes the effect of offset error. For unipolar
full-scale error, the deviation of the last code transition from ideal, divided
by the full-scale range, and includes the effect of offset error.
Note 12: All Specifications in dB are referred to a full-scale ±10V input.
Note 13: Recovers to specified performance after (2 • FS) input
overvoltage.
Note 14: t
with 50% duty cycle and f
setup time for the receiving logic).
Note 15: The specification is referred to the ±10V input range.
LTC1857/LTC1858/LTC1859
6
of 45ns maximum allows f
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
SCK
MIN
100
40
50
10
10
20
0
5
0
7
5
up to 20MHz for falling capture (with 5ns
SCK
up to 10MHz for rising capture
TYP
166
15
25
20
11
20
10
4
1
6
6
MAX
20
30
45
30
30
5
4
UNITS
185789f
5
MHz
kHz
kHz
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns