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| 型号： | MCP3302T-BI/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 9/48页 |
| 文件大小： | 0K |
| 描述： | IC ADC 13BIT 2.7V 2CH SPI14TSSOP |
| 标准包装： | 2,500 |
| 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： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 4 个单端，单极；2 个差分，单极 |
| 其它名称： | MCP3302TBI/ST |
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2011 Microchip Technology Inc.
DS21697F-page 17
MCP3302/04
5.0
APPLICATIONS INFORMATION
5.1
Conversion Description
The MCP3302/04 A/D converter employ a conven-
tional SAR architecture. With this architecture, the
potential between the IN+ and IN- inputs are
simultaneously sampled and stored with the internal
sample circuits for 1.5 clock cycles (tACQ). Following
this sampling time, the input hold switches of the con-
verter open and the device uses the collected charge to
produce a serial 13-bit binary two’s complement output
code. This conversion process is driven by the external
clock and must include 13 clock cycles, one for each
bit. During this process, the most significant bit (MSB)
is output first. This bit is the sign bit and indicates
whether the IN+ input or the IN- input is at a higher
potential.
FIGURE 5-1:
Simplified Block Diagram.
5.2
Driving the Analog Input
The analog input of the MCP3302/04 is easily driven,
either differentially or single ended. Any signal that is
common to the two input channels will be rejected by
the common mode rejection of the device. During the
charging time of the sample capacitor, a small charging
current will be required. For low-source impedances,
this input can be driven directly. For larger source
impedances, a larger acquisition time will be required,
due to the RC time constant that includes the source
impedance. For the A/D Converter to meet specifica-
tion, the charge holding capacitor (CSAMPLE) must be
given enough time to acquire a 13-bit accurate voltage
level during the 1.5 clock cycle acquisition period.
An analog input model is shown in Figure 5-3. This
model is accurate for an analog input, regardless of
whether it is configured as a single-ended input, or the
IN+ and IN- input in differential mode. In this diagram,
it is shown that the source impedance (RS) adds to the
internal sampling switch (RSS) impedance, directly
affecting the time that is required to charge the capaci-
tor (CSAMPLE). Consequently, a larger source imped-
ance with no additional acquisition time increases the
offset, gain, and integral linearity errors of the conver-
sion. To overcome this, a slower clock speed can be
used to allow for the longer charging time. Figure 5-2
shows the maximum clock speed associated with
source impedances.
FIGURE 5-2:
Maximum Clock Frequency
vs. Source Resistance (RS) to maintain ±1 LSB
INL.
Comp
13-Bit SAR
CDAC
IN+
IN-
Shift
Register
CSAMP
Hold
+
-
Hold
CSAMP
DOUT
0.0
0.5
1.0
1.5
2.0
2.5
100
1000
10000
100000
Source Resistance (ohms)
Maxi
mu
m
C
lo
ck
Fr
eq
ue
ncy
(M
H
z)
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相关代理商/技术参数 |
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|---|---|
| MCP3302T-CI/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface |
| MCP3302T-CI/SL | 功能描述:模数转换器 - ADC 13-bit Diff In 2 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3302T-CI/ST | 功能描述:模数转换器 - ADC 13-bit Diff In 2 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3302TI/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface |
| MCP3302T-I/P | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:13-Bit Differential Input, Low Power A/D Converter with SPI Serial Interface |
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