tSMPL Analog Input Sample Time See Oper" />
參數(shù)資料
型號(hào)： LTC1286IN8#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 19/24頁(yè)
文件大小： 0K
描述： IC A/D CONV SAMPLING 12BIT 8-DIP
標(biāo)準(zhǔn)包裝： 50
位數(shù)： 12
采樣率（每秒）： 12.5k
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 1.25mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 通孔
封裝/外殼： 8-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 8-PDIP
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)差分，單極
4
LTC1286/LTC1298
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tSMPL
Analog Input Sample Time
See Operating Sequence
1.5
CLK Cycles
fSMPL(MAX) Maximum Sampling Frequency
LTC1286
q
12.5
kHz
LTC1298
q
11.1
kHz
tCONV
Conversion Time
See Operating Sequence
12
CLK Cycles
tdDO
Delay Time, CLK
↓ to DOUT Data Valid
See Test Circuits
q
250
600
ns
tdis
Delay Time, CS
↑ to DOUT Hi-Z
See Test Circuits
q
135
300
ns
ten
Delay Time, CLK
↓ to DOUT Enable
See Test Circuits
q
75
200
ns
thDO
Time Output Data Remains Valid After CLK
↓
CLOAD = 100pF
230
ns
tf
DOUT Fall Time
See Test Circuits
q
20
75
ns
tr
DOUT Rise Time
See Test Circuits
q
20
75
ns
CIN
Input Capacitance
Analog Inputs, On Channel
20
pF
Analog Inputs, Off Channel
5
pF
Digital Input
5
pF
AC CHARACTERISTICS (Note 5)
The q 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 fCLK ≥ 120kHz at 85°C, fCLK ≥
75kHz at 70
° and fCLK ≥ 1kHz at 25°C.
Note 5: VCC = 5V, VREF = 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 VCC. This spec allows 50mV forward
bias of either diode for 4.5V
≤ VCC ≤ 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
< VCC
≤ 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 PERFORMANCE CHARACTERISTICS
U
W
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
SUPPLY
CURRENT
(A)
TA = 25°C
VCC = VREF = 5V
fCLK = 200kHz
LTC1286
LTC1298
Supply Current vs Temperature
TEMPERATURE (°C)
–55
200
SUPPLY
CURRENT
(A)
250
350
400
450
–15
25
45
125
LT1286/98 G04
300
–35
5
65
85 105
TA = 25°C
VCC = VREF = 5V
fCLK = 200kHz
LTC1298 fSMPL =11.1kHz
LTC1286 fSMPL =12.5kHz
FREQUENCY (kHz)
1
0.002
SUPPLY
CURRENT
(A)
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)
TA = 25°C
VCC = VREF = 5V
CS = VCC
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