LTC1090 Linear Technology, LTC1090 Datasheet - Page 4

• Manufacturer Part Number: LTC1090
• Description: Single Chip 10-Bit Data Acquisition System
• Manufacturer: Linear Technology

DIGITAL A D DC ELECTRICAL CHARACTERISTICS
over the full operating temperature range, otherwise specification are T
LTC1090
SYMBOL
V
V
I
I
V
V
I
I
I
I
I
I
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 = 2.0MHz, SCLK = 0.5MHz unless otherwise
specified.
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: Linearity error is specified between the actual end points of the
A/D transfer curve.
Note 6: Total unadjusted error includes offset, gain, linearity, multiplexer
and hold step errors.
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
4
IH
IL
OZ
SOURCE
SINK
CC
REF
–
IH
IL
OH
OL
–
CC
wired together (unless otherwise noted).
= 5V, V
High Level lnput Voltage
Low Level Input Voltage
High Level lnput Current
Low Level Input Current
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage
Output Source Current
Output Sink Current
Positive Supply Current
Reference Current
Negative Supply Current
PARAMETER
REF
REF
U
+ = 5V, V
= 5V, 1LSB (bipolar) = 2(5V)/1024 = 9.77mV.
REF
– = 0V, V
–
= 0V for unipolar mode and
REF
) divided by 1024.
CONDITIONS
V
V
V
V
V
V
V
V
V
V
V
CS High, REF
V
CS High, V
CC
CC
IN
IN
CC
CC
CC
OUT
OUT
OUT
OUT
REF
= V
= 0V
= 5.25V
= 4.75V
= 4.75V, l
= 4.75V, l
= 4.75V, l
= 5V
= V
= 0V, CS High
= 0V
= V
CC
CC
CC
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 edges 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.
–
, CS High
CC
A
= – 5V
+
= 25°C. (Note 3)
O
O
O
levels (4.5V), as high level reference or analog inputs (5V) can cause
Open
= 10µA
= 360µA
= 1.6mA
–
or one diode drop above V
The
MIN
2.0
2.4
denotes specifications which apply
LTC1090/LTC1090A
CC
. Be careful during testing at low
TYP
–10
4.7
4.0
0.5
10
1.0
1
MAX
–2.5
0.8
2.5
0.4
2.5
1.0
–3
50
3
UNITS
1090fc
mA
mA
mA
mA
µA
µA
µA
µA
µA
V
V
V
V
V