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参数资料
| 型号： | DC746A |
| 厂商： | Linear Technology |
| 文件页数： | 27/36页 |
| 文件大小： | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2412 |
| 软件下载： | QuikEval System |
| 设计资源： | DC746A Design File DC746A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 7.5 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 工作温度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2412 |
| 已供物品： | 板 |
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LTC2412
33
2412f
APPLICATIO S I FOR ATIO
WU
U
Figure 38. Input Normal Mode Rejection vs Input Frequency with Input Perturbation of 100% Full Scale (50Hz Notch)
of full scale. In many industrial applications, it is not un-
common to have to measure microvolt level signals super-
imposed over volt level perturbations and LTC2412 is
eminently suited for such tasks. When the perturbation is
differential, the specification of interest is the normal mode
rejection for large input signal levels. With a reference
voltage VREF = 5V, the LTC2412 has a full-scale differen-
tial input range of 5V peak-to-peak. Figures 39 and 40 show
measurement results for the LTC2412 normal mode rejec-
tion ratio with a 7.5V peak-to-peak (150% of full scale)
input signal superimposed over the more traditional nor-
mal mode rejection ratio results obtained with a 5V peak-
to-peak (full scale) input signal. In Figure 39, the LTC2412
uses the internal oscillator with the notch set at 60Hz (FO
= LOW) and in Figure 40 it uses the internal oscillator with
the notch set at 50Hz (FO=HIGH).ItisclearthattheLTC2412
rejection performance is maintained with no compromises
in this extreme situation. When operating with large input
signal levels, the user must observe that such signals do
not violate the device absolute maximum ratings.
Measuring Barometric Pressure and Temperature
with a Single Sensor
Figure 41 shows the LTC2412 measuring both tempera-
ture and pressure from an Intersema model MS5401-BM
absolute pressure sensor. The bridge has a nominal
impedance of 3.4k, a temperature coefficient of resistance
of 2900ppm/
°C and a temperature coefficient of span of
–1900ppm/
°C. R1 provides first order temperature com-
pensation of the output span by causing the bridge voltage
to increase by 1900ppm/
°C, offsetting the –1900ppm/°C
TC of span. R1 should have a much smaller TC than that
of the bridge resistance; 50ppm/
°C or less is satisfactory.
In addition to compensating the bridge output span, this
circuit also provides a convenient way to measure ambient
temperature. Channel 1 of the LTC2412 measures the
bridge excitation voltage, which has a slope of approxi-
mately 3.2mV/
°C. Channel 0 measures the bridge output,
which has a slope of 50mV/bar. The temperature reading
can also be used for second order compensation of the
pressure reading.
INPUT FREQUENCY (Hz)
0
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
NORMAL
MODE
REJECTION
(dB)
2412 F38
0
–20
–40
–60
–80
–100
–120
VCC = 5V
REF+ = 5V
REF – = GND
VINCM = 2.5V
VIN(P-P) = 5V
FO = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
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