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參數(shù)資料
| 型號： | LTC1400IS8 |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC A/D CONV 12BIT W/SHTDN 8-SOIC |
| 標準包裝： | 100 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 400k |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 160mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個單端，雙極 |
| 產(chǎn)品目錄頁面： | 1346 (CN2011-ZH PDF) |
LTC1400
10
1400fa
trimmed to 2.42V. It is internally connected to the DAC
and is available at Pin 3 to provide up to 1mA of current to
an external load. For minimum code transition noise, the
reference output should be decoupled with a capacitor to
lter wideband noise from the reference (10μF tantalum in
parallel with a 0.1μF ceramic). The VREF pin can be driven
with a DAC or other means to provide input span adjust-
ment in bipolar mode. The VREF pin must be driven to at
least 2.45V to prevent conict with the internal reference.
The reference should not be driven to more than 5V.
Figure 6 shows an LT1360 op amp driving the reference
pin. Figure 7 shows a typical reference, the LT1019A-5
connected to the LTC1400. This will provide an improved
drift (equal to the maximum 5ppm/°C of the LT1019A-
5) and a ±4.231V full scale. If VREF is forced lower than
2.42V, the REFRDY bit in the serial data output will be
forced to low.
APPLICATIO S I FOR ATIO
W
U
1400 F06
–
+
VREF(OUT) ≥ 2.45V
AIN
VREF
GND
10
F
3
INPUT RANGE
±0.846 VREF(OUT)
5V
–5V
LTC1400
LT1360
VCC
VSS
Figure 9. LTC1400 Bipolar Transfer Characteristics
Figure 6. Driving the VREF with the LT1360 Op Amp
1400 F07
10
F
3
INPUT RANGE
±4.231V
(=
±0.846 VREF)
–5V
LT1019A-5
10V
VIN
VOUT
GND
5V
AIN
VREF
GND
LTC1400
VCC
VSS
Figure 7. Supplying a 5V Reference Voltage
to the LTC1400 with the LT1019A-5
Unipolar/Bipolar Operation and Adjustment
Figure 8 shows the ideal input/output characteristics for
the LTC1400. The code transitions occur midway between
successive integer LSB values (i.e., 0.5LSB, 1.5LSB,
2.5LSB, … FS – 1.5LSB). The output code is straight
binary with 1LSB = 4.096V/4096 = 1mV. Figure 9 shows
the input/output transfer characteristics for the bipolar
mode in two’s complement format.
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
FS – 1LSB
1400 F08
111...111
111...110
111...101
111...100
000...000
000...001
000...010
000...011
1
LSB
UNIPOLAR
ZERO
1LSB = FS
4096
Figure 8. LTC1400 Unipolar Transfer Characteristics
INPUT VOLTAGE (V)
0V
OUTPUT
CODE
–1
LSB
11400 F09
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB
–FS/2
Unipolar Offset and Full-Scale Error Adjustments
In applications where absolute accuracy is important,
offset and full-scale errors can be adjusted to zero. Figure
10a shows the extra components required for full-scale
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