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LTC1283 Просмотр технического описания (PDF) - Linear Technology

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LTC1283 Datasheet PDF : 24 Pages
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LTC1283
DIGITAL A D DC ELECTRICAL CHARACTERISTICS (Note 3)
SYMBOL
IOZ
PARAMETER
Hi-Z Output Leakage
ISOURCE
ISINK
ICC
IREF
I
Output Source Current
Output Sink Current
Positive Supply Current
Reference Current
Negative Supply Current
CONDITIONS
VOUT = VCC, CS High
VOUT = 0V, CS High
VOUT = 0V
VOUT = VCC
CS High, REF + Open
VREF = 2.5V
CS High, V = – 3V
LTC1283/LTC1283A
MIN TYP MAX
q
3
q
–3
– 4.5
4.5
q
150 350
q
250 500
q
–1
– 50
UNITS
µA
µA
mA
mA
µA
µA
µA
The q denotes specifications which apply over the operating temperature
range; all other limits and typicals TA = 25°C.
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 wired together (unless otherwise noted).
Note 3: VCC = 3V, VREF+ = 2.5V, VREF– = 0V, V = 0V for unipolar mode
and – 3V for bipolar mode, ACLK = 1MHz, SCLK = 0.25MHz unless
otherwise specified.
Note 4: These specifications apply for both unipolar and bipolar modes. In
bipolar mode, one LSB is equal to the bipolar input span (2VREF) divided
by 1024. For example, when VREF = 2.5V, 1LSB (bipolar) = 2(2.5V)/1024 =
4.88mV.
Note 5: Linearity error is the deviation from ideal of the slope between the
two end points of the transfer curve.
Note 6: Two on-chip diodes are tied to each reference and analog input
which will conduct for reference or analog input voltages one diode drop
below V or one diode drop above VCC. Be careful during testing at low
VCC levels, as high level reference or analog inputs can cause 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.
Note 7: Channel leakage current is measured after the channel selection.
Note 8: 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.
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Temperature
250
REF+ OPEN
ACLK = 500kHz
200 VCC = CS = 3V
150
100
50
0
–50 –25 0 25 50 75 100 125
AMBIENT TEMPERATURE (°C)
LTC1283 • G01
Reference Current vs Temperature
500
VCC = 3V
VREF = 2.5V
400
300
200
100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC1283 • G02
Unadjusted Offset Error
vs Reference Voltage
10
9
VCC = 3V
ACLK = 500kHz
8
7
6
5
4
3
2
1
0
0
0.5 1.0 1.5 2.0 2.5
REFERENCE VOLTAGE (V)
LTC1283 • G03
4

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