LTC1289 Linear Technology, LTC1289 Datasheet - Page 4

• Manufacturer Part Number: LTC1289
• Description: 3 Volt Single Chip 12-Bit Data Acquisition System
• Manufacturer: Linear Technology

LTC1289
DIGITAL A D
SYMBOL
V
V
I
I
V
V
I
I
I
I
I
I
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 impared.
Note 2: All voltage values are with respect to ground with DGND, AGND
and REF
Note 3: V
and – 3V for bipolar mode, ACLK = 2.0MHz 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
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 analog input which will
conduct for analog voltages one diode drop below GND or one diode drop
above V
4
IH
IL
OZ
SOURCE
SINK
CC
REF
–
IH
IL
OH
OL
–
= – 2.7V for bipolar mode.
denotes specifications which apply over the operating temperature
CC
–
wired together (unless otherwise noted).
CC
. Be careful during testing at low V
= 3V, V
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
Negative Supply Current
REF
REF
+ = 2.5V, V
U
= 2.5V, 1LSB(bipolar) = 2(2.5)/4096 = 1.22mV.
DC
REF
A
– = 0V, V
= 25 C.
ELECTRICAL C
CC
–
levels, as high level analog
= 0V for unipolar mode
REF
) divided by 4096.
CONDITIONS
V
V
V
V
V
V
V
V
V
V
CS High
CS High, Power Shutdown, ACLK Off
V
CS High
CC
CC
IN
IN
CC
CC
OUT
OUT
OUT
OUT
REF
I
I
I
I
O
O
O
O
= V
= 0V
= 3.6V
= 3.0V
= 3.0V
= 3.0V
= 20 A
= 400 A
= 20 A
= 400 A
= 2.5V
= V
= 0V, CS High
= 0V
= V
CC
CC
CC
HARA TER STICS
, CS High
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: 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 set-up time has elasped. See Typical Peformance
Characteristics curves for additional information (t
Note 10: Increased leakage currents at elevated temperatures cause the
S/H to droop, therefore it's recommended that f
f
ACLK
C
15kHz at 25 C.
I
(Note 3)
MIN
2.1
2.7
LTC1289B
LTC1289C
2.90
2.85
0.05
0.10
TYP
–10
1.5
1.0
10
9
1
ACLK
suCS
MAX
0.45
– 2.5
2.5
0.3
– 3
10
50
50
3
5
125kHz at 85 C and
vs V
CC
).
UNITS
mA
mA
mA
V
V
A
A
V
V
A
A
A
A
A