LTC1287 LINER [Linear Technology], LTC1287 Datasheet - Page 3

• Manufacturer Part Number: LTC1287
• Description: 3V Single Chip 12-Bit Data Acquisition System
• Manufacturer: LINER [Linear Technology]

SYMBOL
t
t
t
t
t
t
t
t
C
The
range; all other limits and typicals T
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 (unless otherwise
noted).
Note 3: V
Note 4: One LSB is equal to V
= 2.5V, 1LSB = 2.5V/4096 = 0.61mV.
Note 5: Integral nonlinearity error 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.
AC CHARACTERISTICS
DIGITAL A D
hDO
f
r
WHCLK
WLCLK
suCS
WHCS
WLCS
SYMBOL
V
V
I
I
V
V
I
I
I
I
I
IN
IH
IL
OZ
SOURCE
SINK
CC
REF
IH
IL
OH
OL
denotes specifications which apply over the operating temperature
CC
= 3V, V
PARAMETER
Time Output Data Remains Valid After CLK
D
D
CLK High Time
CLK Low Time
Setup Time, CS Before CLK
CS High Time Between Data Transfer Cycles
CS Low Time During Data Transfer
Input Capacitance
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
Low Level Output Voltage
High Z Output Leakage
Output Source Current
Output Sink Current
Positive Supply Current
Reference Current
OUT
OUT
Fall Time
Rise Time
REF
= 2.5V, CLK = 500kHz unless otherwise specified.
U
REF
DC
divided by 4096. For example, when V
A
= 25 C.
ELECTRICAL C
(Note 3)
CONDITIONS
See Test Circuits
V
V
V
V
V
Analog Inputs On Channel
Analog Inputs Off Channel
Digital Inputs
See Test Circuits
CONDITIONS
V
V
V
V
V
V
V
V
V
V
CS High
V
CC
CC
CC
CC
CC
CC
CC
IN
IN
CC
CC
OUT
OUT
OUT
OUT
REF
HARA TER STICS
= 3V (Note 6)
= 3V (Note 6)
= 3V (Note 6)
= 3V (Note 6)
= 3V (Note 6)
= V
= 0V
= 3.6V
= 3.0V
= 3.0V, I
= 3.0V, I
= 2.5V
REF
= V
= 0V, CS High
= 0V
= V
CC
CC
CC
, CS High
I
I
O
O
O
O
Note 6: Recommended operating conditions.
Note 7: Two on-chip diodes are tied to each analog input which will
conduct for analog voltages one diode drop below GND or one diode drop
above V
inputs can cause this input diode to conduct, especially at elevated
temperature, and cause errors for inputs near full scale. This spec allows
50mV forward bias of either diode. This means that as long as the analog
input does not exceed the supply voltage by more than 50mV, the output
code will be correct.
Note 8: Channel leakage current is measured after the channel selection.
Note 9: Increased leakage currents at elevated temperatures cause the S/
H to droop, therefore it is recommended that f
f
= 400 A
= 20 A
= 400 A
= 20 A
CLK
C
3kHz at 25 C.
CC
. Be careful during testing at low V
I
(Note 3)
LTC1287B/LTC1287C
MIN
600
800
100
5.0
LTC1287B/LTC1287C
MIN
14
2.1
2.7
TYP
100
2.90
2.85
0.05
0.10
50
40
40
TYP
–10
1.5
CC
5
5
10
9
CLK
levels, as high level analog
30kHz at 85 C and
MAX
100
100
MAX
0.45
–2.5
2.5
0.3
–3
50
3
5
LTC1287
CLK Cycles
UNITS
UNITS
3
mA
mA
mA
ns
ns
ns
ns
ns
ns
pF
pF
pF
s
V
V
A
A
V
V
V
V
A
A
A