LTC1290BI LINER [Linear Technology], LTC1290BI Datasheet - Page 4

• Manufacturer Part Number: LTC1290BI
• Description: Single Chip 12-Bit Data Acquisition System
• Manufacturer: LINER [Linear Technology]

LTC1290
DIGITAL A D
SYMBOL
I
I
I
I
The
temperature 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 with DGND, AGND
and REF
Note 3: V
– 5V for bipolar mode, ACLK = 4.0MHz unless otherwise speicfied.
Note 4: These specs apply for both unipolar and bipolar modes. In bipolar
mode, one LSB is equal to the bipolar input span (2V
For example, when V
Note 5: 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 6: Recommended operating conditions.
Note 7: Two on-chip diodes are tied to each reference and analog input
which will conduct for reference or analog input voltages one diode drop
TYPICAL PERFOR
4
SINK
CC
REF
–
26
22
18
14
10
6
2
denotes specifications which apply over the full operating
4
Supply Current vs Supply Voltage
–
CC
wired together (unless otherwise noted).
ACLK = 4MHz
T
A
= 5V, V
= 25 C
PARAMETER
Output Sink Current
Positive Supply Current
Reference Current
Negative Supply Current
SUPPLY VOLTAGE, V
REF +
REF
6
U
= 5V, 1LSB (bipolar) = 2(5V)/4096 = 2.44mV.
= 5V, V
DC
REF –
8
CC
(V)
W
= 0V, V
ELECTRICAL C
1290 • TPC01
A
–
U
= 0V for unipolar mode and
10
CE
A
= 25 C.
REF
C
) divided by 4096.
HARA TERISTICS
CONDITIONS
V
CS High
CS High
Power Shutdown LTC1290DC, LTC1290BI
ACLK Off
V
CS High
10
9
8
7
6
5
4
3
OUT
REF
–50
Supply Current vs Temperature
= 5V
= V
ACLK = 4MHz
V
–30
CC
CC
AMBIENT TEMPERATURE, T
= 5V
C
HARA TER STICS
–10
10
LTC1290BC, LTC1290CC
LTC1290CI, LTC1290DI
LTC1290BM, LTC1290CM
LTC1290DM
30
below V
V
this input diode to conduct, especially at elevated temperatures and cause
errors for inputs near full scale. This spec allows 50mV forward bias of
either diode. This means that as long as the reference or analog input does
not exceed the supply voltage by more than 50mV, the output code will be
correct. To achieve an absolute 0V to 5V input voltage range will therefore
require a minimum supply voltage of 4.950V over initial tolerance,
temperature variations and loading.
Note 8: Channel leakage current is measured after the channel selection.
Note 9: To minimize errors caused by noise at the chip select input, the
internal circuitry waits for two ACLK falling edge after a chip select falling
edge is detected before responding to control input signals. Therefore, no
attempt should be made to clock an address in or data out until the
minimum chip select setup time has elapsed.
Note 10: Increased leakage currents at elevated temperatures cause the
S/H to droop, therefore it's recommended that f
f
ACLK
C
CC
50
levels (4.5V), as high level reference or analog inputs (5V) can cause
70
125kHz at 85 C and f
–
or one diode drop above V
A
I
90 110 130
( C)
LT1290 • TPC02
(Note 3)
ACLK
LTC1290B/LTC1290C/LTC1290D
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
MIN
1
Unadjusted Offset Voltage vs
Reference Voltage
15kHz at 25 C.
CC
. Be careful during testing at low
REFERENCE VOLTAGE, V
TYP
20
10
2
6
5
5
1
V
ACLK
OS
V
OS
= 0.25mV
= 0.125mV
MAX
12
10
15
50
50
500kHz at 125 C,
3
REF
4
V
(V)
CC
UNITS
1290 • TPC03
= 5V
mA
mA
A
A
A
A
5