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參數資料
| 型號： | 522923D |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | 集成電路 |
| 文件頁數： | 4/24頁 |
| 文件大?。?/td> | 418K |
| 代理商： | 522923D |
4
LTC1286/LTC1298
SYMBOL
t
SMPL
f
SMPL(MAX)
PARAMETER
Analog Input Sample Time
Maximum Sampling Frequency
CONDITIONS
See Operating Sequence
LTC1286
LTC1298
See Operating Sequence
See Test Circuits
See Test Circuits
See Test Circuits
C
LOAD
= 100pF
See Test Circuits
See Test Circuits
Analog Inputs, On Channel
Analog Inputs, Off Channel
Digital Input
MIN
TYP
1.5
MAX
UNITS
CLK Cycles
G
G
12.5
11.1
kHz
kHz
t
CONV
t
dDO
t
dis
t
en
t
hDO
t
f
t
r
C
IN
Conversion Time
Delay Time, CLK
↓
to D
OUT
Data Valid
Delay Time, CS
↑
to D
OUT
Hi-Z
Delay Time, CLK
↓
to D
OUT
Enable
Time Output Data Remains Valid After CLK
↓
D
OUT
Fall Time
D
OUT
Rise Time
Input Capacitance
12
250
135
75
230
20
20
20
5
5
CLK Cycles
G
600
300
200
ns
ns
ns
ns
ns
ns
pF
pF
pF
G
G
G
75
75
G
AC CHARACTERISTICS
(Note 5)
The
G
denotes specifications which apply over the full operating
temperature range.
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 GND.
Note 3:
These devices are specified at 5V. For 3V specified devices, see
LTC1285 and LTC1288.
Note 4:
Increased leakage currents at elevated temperatures cause the S/H
to droop, therefore it is recommended that f
CLK
≥
120kHz at 85
°
C, f
CLK
≥
75kHz at 70
°
and f
CLK
≥
1kHz at 25
°
C.
Note 5:
V
CC
= 5V, V
REF
= 5V and CLK = 200kHz unless otherwise specified.
Note 6:
Linearity error is specified between the actual end points of the
A/D transfer curve.
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 GND or one diode drop above V
CC
. This spec allows 50mV forward
bias of either diode for 4.5V
≤
V
CC
≤
5.5V. 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. For 5.5V
< V
CC
≤
9V, reference and analog input range cannot exceed 5.55V. If
reference and analog input range are greater than 5.55V, the output code
will not be guaranteed to be correct.
Note 8:
The supply voltage range for the LTC1286 is from 4.5V to 9V, but
the supply voltage range for the LTC1298 is only from 4.5V to 5.5V.
Note 9:
Recommended operating conditions
Note 10:
Channel leakage current is measured after the channel selection.
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
Shutdown Supply Current vs Clock
Rate with CS High and CS Low
Supply Current vs Sample Rate
SAMPLE RATE (kHz)
0.1k
1
10
100
1000
1k
10k
100k
LT1286/98 G03
S
T
A
= 25°C
V
CC
= V
= 5V
f
CLK
= 200kHz
LTC1286
LTC1298
Supply Current vs Temperature
TEMPERATURE (°C)
–55
200
S
250
350
400
450
–15
25
45
125
LT1286/98 G04
300
–35
5
65
85 105
T
A
= 25°C
V
CC
= V
= 5V
f
CLK
= 200kHz
LTC1298 f
SMPL
=11.1kHz
LTC1286 f
SMPL
=12.5kHz
FREQUENCY (kHz)
1
0.002
S
5
1
0
15
20
25
35
20
100
140
LT1286/98 G01
10
30
80
180 200
40 60
120
160
CS = 0
(AFTER CONVERSION)
T
A
= 25°C
V
CC
= V
REF
= 5V
CS = V
CC
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