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参数资料
| 型号： | MCP4725EV |
| 厂商： | Microchip Technology |
| 文件页数： | 28/50页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR MCP4725 |
| 标准包装： | 1 |
| DAC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 100k ~ 3.4M |
| 数据接口： | I²C |
| 设置时间： | 6µs |
| DAC 型： | 电压 |
| 工作温度： | -40°C ~ 125°C |
| 已供物品： | 2 板，CD |
| 已用 IC / 零件： | MCP4725 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
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MCP4725
DS22039D-page 34
2009 Microchip Technology Inc.
8.2
Using Non-Volatile EEPROM
Memory
The user can store the DAC input code (12 bits) and
power-down configuration bits (2 bits) in the internal
non-volatile EEPROM memory using the I2C write
command. The user can also read the EEPROM data
using the I2C read command. When the device is first
powered after power is shut down, the device uploads
the
EEPROM
contents
to
the
DAC
register
automatically
and
provides
the
DAC
output
immediately. This feature is very useful in applications
where the DAC device is used to provide set point or
calibration data for other devices in the application
system. The DAC will not lose the important system
operational parameters due to the system power failure
incidents. See Section 5.6 “Non-Volatile EEPROM
Memory” for more details of the non-volatile EEPROM
memory.
8.3
Power Supply Considerations
The power supply to the device is used for both VDD
and DAC reference voltage. Any noise induced on the
VDD line can affect on the DAC performance. Typical
application will require a bypass capacitor in order to
filter out high frequency noise on the VDD line. The
noise can be induced onto the power supply’s traces or
as a result of changes on the DAC output. The bypass
capacitor helps to minimize the effect of these noise
sources on signal integrity. Figure 8-1 shows an
example of using two bypass capacitors (a 10 F
tantalum capacitor and a 0.1 F ceramic capacitor) in
parallel on the VDD line. These capacitors should be
placed as close to the VDD pin as possible (within
4mm).
The power source should be as clean as possible. If the
application circuit has separate digital and analog
power supplies, the VDD and VSS pins of the MCP4725
should reside on the analog plane.
8.4
Layout Considerations
Inductively-coupled AC transients and digital switching
noise from other devices can affect on DAC
performance and DAC output signal integrity. Careful
board layout will minimize these effects. Bench testing
has shown that a multi-layer board utilizing a low-
inductance ground plane, isolated inputs, isolated
outputs and proper decoupling are critical to achieving
the performance that the MCP4725 is capable of
providing. Particularly harsh environments may require
shielding of critical signals. Separate digital and analog
ground planes are recommended. In this case, the VSS
pin and the ground pins of the VDD capacitors of the
MCP4725 should be terminated to the analog ground
plane.
8.5
Application Examples
The MCP4725 is a rail-to-rail output DAC designed to
operate with a VDD range of 2.7V to 5.5V. Its output
amplifier is robust enough to drive common, small-
signal loads directly, thus eliminating the cost and size
of an external buffer for most applications.
8.5.1
DC SET POINT OR CALIBRATION
A common application for the MCP4725 is a digitally-
controlled set point or a calibration of variable
parameters such as sensor offset or bias point.
Example 8-1 shows an example of the set point setting.
Since the MCP4725 is a 12-bit DAC and uses the VDD
supply as a reference source, it provides a VDD/4096 of
resolution per step.
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| MCP4726A0T-E/MAY | 功能描述:数模转换器- DAC Sngl 12B NV DAC w/Ex Vref & I2C interface RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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| MCP4726A1T-E/MAY | 功能描述:数模转换器- DAC Sngl 12B NV DAC w/Ex Vref & I2C interface RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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