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| 型号： | MCP3304T-CI/SL |
| 厂商： | Microchip Technology |
| 文件页数： | 11/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC 13BIT 2.7V 4CH SPI 16SOIC |
| 标准包装： | 2,600 |
| 位数： | 13 |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 8 个单端，单极；4 个差分，单极 |
| 其它名称： | MCP3304TCI/SL |
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2011 Microchip Technology Inc.
DS21697F-page 19
MCP3302/04
Using an external operation amplifier on the input
allows for gain and also buffers the input signal from the
input to the ADC allowing for a higher source
impedance. This circuit is shown in Figure 5-5.
FIGURE 5-5:
Adding an amplifier allows
for gain and also buffers the input from any high-
impedance sources.
This circuit shows that some headroom will be lost due
to the amplifier output not being able to swing all the
way to the rail. An example would be for an output
swing of 0V to 5V. This limitation can be overcome by
supplying a VREF that is slightly less than the common
mode voltage. Using a 2.048V reference for the A/D
converter while biasing the input signal at 2.5V solves
the problem. This circuit is shown in Figure 5-6.
FIGURE 5-6:
Circuit solution to overcome
amplifier output swing limitation.
5.4
Common Mode Input Range
The common mode input range has no restriction and is
equal to the absolute input voltage range: VSS -0.3V to
VDD + 0.3V. However, for a given VREF, the common
mode voltage has a limited swing, if the entire range of
the A/D converter is to be used. Figure 5-7 and
common mode voltage swing. A smaller VREF allows for
wider flexibility in a common mode voltage. VREF levels,
down to 400 mV, exhibit less than 0.1 LSB change in
INL and DNL.
For characterization graphs that show this performance
relationship, see Figure 2-2 and Figure 2-6.
FIGURE 5-7:
Common Mode Input Range
of Full Differential Input Signal versus VREF.
FIGURE 5-8:
Common Mode Input Range
versus VREF for Pseudo Differential Input.
VDD = 5V
-
+
MCP6021
IN+
IN-
VREF
MCP330X
1F
MCP1525
VIN
VOUT
1k
10 k
1M
VIN
0.1 F
1F
1M
2.048V
VDD = 5V
-
+
0.1 F
MCP606
IN+
IN-
VREF
MCP330X
1F
MCP1525
VIN
VOUT
0.1 F
1k
10 k
1F
VIN
10 k
VREF(V)
0.25
VDD = 5V
5.0
1.0
2.5
4.0
-1
0
1
2
3
4
5
4.05V
2.8V
2.3V
0.95V
Comm
on
M
ode
Rang
e(V)
VREF (V)
0.25
VDD = 5V
2.5
0.5
1.25
2.0
-1
0
1
2
3
4
5
4.05V
2.8V
2.3V
0.95V
Com
m
on
M
ode
R
ange
(V)
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