LTC1093CSW Просмотр технического описания (PDF) - Linear Technology
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LTC1093CSW Datasheet PDF : 32 Pages
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LTC1091/LTC1092
LTC1093/LTC1094
AC CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)
SYMBOL PARAMETER
CONDITIONS
LTC1091A/LTC1092A/LTC1093A/LTC1094A
LTC1091/LTC1092/LTC1093/LTC1094
MIN
TYP
MAX
UNITS
tSMPL Analog Input Sample Time
See Operating Sequence
1.5
CLK Cycles
tCONV Conversion Time
See Operating Sequence
10
CLK Cycles
tdDO
Delay Time, CLK↓ to DOUT Data Valid
See Test Circuits
q
400
850
ns
tdis
Delay Time, CS↑ to DOUT Hi-Z
See Test Circuits
q
180
450
ns
ten
Delay Time, CLK↓ to DOUT Enabled
See Test Circuits
q
160
450
ns
thDO
Time Output Data Remains Valid After SCLK↓
150
ns
tf
DOUT Fall Time
See Test Circuits
q
90
300
ns
tr
DOUT Rise Time
See Test Circuits
q
60
300
ns
CIN
Input Capacitance
Analog Inputs On-Channel
65
pF
Analog Inputs Off-Channel
5
pF
Digital Inputs
5
pF
DIGITAL A D DC ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)
SYMBOL PARAMETER
CONDITIONS
LTC1091A/LTC1092A/LTC1093A/LTC1094A
LTC1091/LTC1092/LTC1093/LTC1094
MIN
TYP
MAX
UNITS
VIH
High Level Input Voltage VCC = 5.25V
q
2.0
VIL
Low Level Input Voltage VCC = 4.75V
q
IIH
High Level Input Current VIN = VCC
q
IIL
Low Level Input Current VIN = 0V
q
VOH
High Level Output Voltage VCC = 4.75V, IOUT = 10µA
VCC = 4.75V, IOUT = 360µA
4.7
q
2.4
4.0
VOL
Low Level Output Voltage VCC = 4.75V, IOUT = 1.6mA
q
IOZ
Hi-Z Output Leakage
VOUT = VCC, CS High
q
VOUT = 0V, CS High
q
ISOURCE Output Source Current
VOUT = 0V
–10
ISINK Output Sink Current
VOUT = VCC
10
ICC
Positive Supply Current LTC1091, CS High
q
1.5
LTC1092/LTC1093/LTC1094, CS High, REF + Open q
1.0
V
0.8
V
2.5
µA
–2.5
µA
V
V
0.4
V
3
µA
–3
µA
mA
mA
3.5
mA
2.5
mA
IREF
Reference Current
LTC1092/LTC1093/LTC1094, VREF = 5V
q
I–
Negative Supply Current LTC1093/LTC1094, CS High, V – = – 5V
q
0.5
1.0
mA
1
50
µA
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,
GND and REF– wired together (unless otherwise noted). REF– is internally
connected to the AGND pin on the LTC1093. DGND, AGND, REF– and V–
are internally connected to the GND pin on the LTC1091/LTC1092.
Note 3: VCC = 5V, VREF+ = 5V, VREF – = 0V, V – = 0V for unipolar mode and
– 5V for bipolar mode, CLK = 0.5MHz unless otherwise specified.
Note 4: These specs apply for both unipolar (LTC1091/LTC1092/LTC1093/
LTC1094) and bipolar (LTC1093/LTC1094 only) modes. In bipolar mode,
one LSB is equal to the bipolar input span (2VREF) divided by 1024. For
example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/1024 = 9.77mV.
Note 5: Linearity error is specified between the actual end points of the
A/D transfer curve.
Note 6: Total unadjusted error includes offset, full scale, 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
below V – or one diode drop above VCC. Be careful during testing at low
VCC levels (4.5V), as high level reference or analog inputs (5V) 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. 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.
4
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