參數(shù)資料
型號： LTC1291BI
廠商： Linear Technology Corporation
英文描述： Single Chip 12-Bit Data Acquisition System
中文描述： 單芯片12位數(shù)據(jù)采集系統(tǒng)
文件頁數(shù)： 3/20頁
文件大?。?/td> 376K
代理商： LTC1291BI
3
LTC1291
SYMBOL
t
dis
t
en
t
hDI
t
hDO
t
WHCLK
t
WLCLK
t
f
t
r
t
suDI
t
suCS
t
WHCS
t
WLCS
C
IN
PARAMETER
Delay Time, CS
↑
to D
OUT
Hi-Z
Delay Time, CLK
↓
to D
OUT
Enabled
Hold Time, D
IN
after CLK
↑
Time Output Data Remains Valid after CLK
↓
CLK High Time
CLK Low Time
D
OUT
Fall Time
D
OUT
Rise Time
Setup Time, D
IN
Stable before CLK
↑
Setup Time, CS
↓
before CLK
↑
CS High Time During Conversion
CS Low Time During Data Transfer
Input Capacitance
CONDITIONS
See Test Circuits
See Test Circuits
V
CC
= 5V (Note 6)
MIN
TYP
80
80
MAX
150
200
UNITS
G
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
G
50
130
V
CC
= 5V (Note 6)
V
CC
= 5V (Note 6)
See Test Circuits
See Test Circuits
V
CC
= 5V (Note 6)
V
CC
= 5V (Note 6)
V
CC
= 5V (Note 6)
V
CC
= 5V (Note 6)
Analog Inputs On Channel
Analog Inputs Off Channel
Digital Inputs
300
400
G
65
25
130
50
G
50
50
500
18
CLK Cycles
100
5
5
pF
pF
pF
AC CHARACTERISTICS
(Note 3)
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
CC
. Be careful during testing at low V
CC
levels (4.5V), as high level
analog inputs (5V) 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:
Increased leakage currents at elevated temperatures cause the
S/H to droop, therefore it is recommended that f
CLK
≥
125kHz at 125
°
C,
f
CLK
≥
30kHz at 85
°
C and f
CLK
≥
3kHz at 25
°
C.
The
G
denotes specifications which apply over the operating temperature
range; all other limits and typicals T
A
= 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 (unless otherwise
noted).
Note 3:
V
CC
= 5V, CLK = 1.0MHz unless otherwise specified.
Note 4:
One LSB is equal to V
CC
divided by 4096. For example, when V
CC
=
5V, 1LSB = 5V/4096 = 1.22mV.
Note 5:
Linearity error is specified between the actual end points of the
A/D transfer curve. The deviation is measured from the center of the
quantization band.
Note 6:
Recommended operating conditions.
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
OH
PARAMETER
High Level Input Voltage
Low Level Input Voltage
High Level Input Current
Low Level Input Current
High Level Output Voltage
CONDITIONS
V
CC
= 5.25V
V
CC
= 4.75V
V
IN
= V
CC
V
IN
= 0V
V
CC
= 4.75V, I
OUT
= –10
μ
A
V
CC
= 4.75V, I
OUT
= –360
μ
A
V
CC
= 4.75V, I
OUT
= 1.6mA
V
OUT
= V
CC
, CS High
V
OUT
= 0V, CS High
V
OUT
= 0V
V
OUT
= V
CC
CS High
MIN
2.0
TYP
MAX
UNITS
G
V
V
G
0.8
2.5
–2.5
G
μ
A
μ
A
V
V
V
μ
A
μ
A
mA
mA
mA
μ
A
μ
A
G
4.7
4.0
G
2.4
V
OL
I
OZ
Low Level Output Voltage
High Z Output Leakage
G
0.4
3
–3
G
G
I
SOURCE
I
SINK
I
CC
Output Source Current
Output Sink Current
Positive Supply Current
–20
20
6
5
5
G
12
10
15
LTC1291BC, LTC1291CC, LTC1291DC
LTC1291BI, LTC1291CI, LTC1291DI,
LTC1291BM, LTC1291CM, LTC1291DM
G
G
LTC1291B/LTC1291C/LTC1291D
(Note 3)
ELECTRICAL C
HARA TER STICS
DIGITAL A D
U
DC
LTC1291B/LTC1291C/LTC1291D
CS High
Power shutdown
CLK Off
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