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参数资料
| 型号： | LTC1285IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/24页 |
| 文件大小： | 0K |
| 描述： | IC A/D CONV SAMPLING 12BIT 8SOIC |
| 标准包装： | 2,500 |
| 位数： | 12 |
| 采样率（每秒）： | 7.5k |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 480µW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
4
LTC1285/LTC1288
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tSMPL
Analog Input Sample Time
See Operating Sequence
1.5
CLK Cycles
fSMPL(MAX) Maximum Sampling Frequency
LTC1285
q
7.5
kHz
LTC1288
q
6.6
kHz
tCONV
Conversion Time
See Operating Sequence
12
CLK Cycles
tdDO
Delay Time, CLK
↓ to DOUT Data Valid
See Test Circuits
q
600
1500
ns
tdis
Delay Time, CS
↑ to DOUT Hi-Z
See Test Circuits
q
220
660
ns
ten
Delay Time, CLK
↓ to DOUT Enable
See Test Circuits
q
180
500
ns
thDO
Time Output Data Remains Valid After CLK
↓
CLOAD = 100pF
520
ns
tf
DOUT Fall Time
See Test Circuits
q
60
180
ns
tr
DOUT Rise Time
See Test Circuits
q
80
180
ns
CIN
Input Capacitance
Analog Inputs, On Channel
20
pF
Analog Inputs, Off Channel
5
pF
Digital Input
5
pF
(Note 5)
AC CHARACTERISTICS
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 3V. For 5V specified devices, see
LTC1286 and LTC1298.
Note 4: Increased leakage currents at elevated temperatures cause the
sample-and-hold to droop, therefore it is recommended that fCLK ≥ 75kHz
at 70
° and fCLK ≥ 1kHz at 25°C.
Note 5: VCC = 2.7V, VREF = 2.5V and CLK = 120kHz 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 2.7V
≤ VCC ≤ 6V. 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 2.7V
input voltage range will therefore require a minimum supply voltage of
2.650V over initial tolerance, temperature variations and loading. For 2.7V
< VCC
≤ 6V, reference and analog input range cannot exceed 6.05V. If
reference and analog input range are greater than 6.05V, the output code
will not be guaranteed to be correct.
Note 8: The supply voltage range for the LTC1285 and the LTC1288 is
from 2.7V to 6V.
Note 9: Recommended operating conditions
Note 10: Channel leakage current is measured after the channel selection.
SAMPLE RATE (kHz)
0.1
1
SUPPLY
CURRENT
(
A)
10
1000
100
110
LTC1285/88 TPC01
LTC1288
LTC1285
TA = 25°C
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz
Supply Current vs Sample Rate
FREQUENCY (kHz)
1
0
SUPPLY
CURRENT
(
A)
1
2
3
4
5
6
20
40
60
80
LTC1285/88 TPC03
100
7
8
9
0.002
120
TA = 25°C
VCC = 2.7V
VREF = 2.5V
CS = 0
(AFTER CONVERSION)
CS = VCC
Shutdown Supply Current vs Clock
Rate with CS High and CS Low
TEMPERATURE (°C)
–55
SUPPLY
CURRENT
(
A)
150
200
250
105
LTC1285/88 TPC02
100
50
0
–15
25
65
–35
125
5
45
85
VCC = 2.7V
VREF = 2.5V
fCLK = 120kHz
LTC1285
fSMPL = 7.5kHz
LTC1288
fSMPL = 6.6kHz
Supply Current vs Temperature
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