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| 型号： | MCP4728EV |
| 厂商： | Microchip Technology |
| 文件页数： | 16/33页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL 12BIT 4CH DAC MCP4728 |
| 视频文件： | MCP4728 Evaluation Board Demo |
| 标准包装： | 1 |
| DAC 的数量： | 4 |
| 位数： | 12 |
| 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： | 板 |
| 已用 IC / 零件： | MCP4728 |
| 产品目录页面： | 673 (CN2011-ZH PDF) |
| 相关产品： | MCP4728T-E/UN-ND - IC DAC 12BIT W/I2C 10-MSOP MCP4728-E/UN-ND - IC DAC 12BIT W/I2C 10-MSOP |
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2010 Microchip Technology Inc.
DS22187E-page 23
MCP4728
4.0
THEORY OF DEVICE
OPERATION
The MCP4728 device is a 12-bit 4-channel buffered
voltage
output
DAC
with
nonvolatile
memory
(EEPROM). The user can program the EEPROM with
I2C address bits, configuration and DAC input data of
each channel. The device has an internal charge pump
circuit to provide the programming voltage of the
EEPROM.
When the device is first powered-up, it automatically
loads the stored data in its EEPROM to the DAC input
and output registers, and provides analog outputs with
the saved settings immediately. This event does not
require an LDAC or UDAC bit condition. After the
device is powered-up, the user can update the input
registers using I2C write commands. The analog
outputs can be updated with new register values if the
LDAC pin or UDAC bit is low. The DAC output of each
channel is buffered with a low power and precision
output amplifier. This amplifier provides a rail-to-rail
output with low offset voltage and low noise.
The device uses a resistor string architecture. The
resistor ladder DAC can be driven from VDD or internal
VREF, depending on the reference selection. The user
can select internal (2.048V) or external reference (VDD)
for each DAC channel individually by software control.
The VDD is used as the external reference. Each
channel is controlled and operated independently.
The device has a Power-Down mode feature. Most of
the circuit in each powered down channel are turned
off.
Therefore,
operating
power
can
be
saved
significantly by putting any unused channel to the
Power-Down mode.
4.1
Power-on Reset (POR)
The device contains an internal Power-on Reset (POR)
circuit that monitors power supply voltage (VDD) during
operation. This circuit ensures correct device start-up
at system power-up and power-down events.
If the power supply voltage is less than the POR
threshold (VPOR = 2V, typical), all circuits are disabled
and there will be no analog output. When the VDD
increases above the VPOR, the device takes a reset
state. During the reset period, each channel uploads all
configuration and DAC input codes from EEPROM,
and analog output (VOUT) will be available accordingly.
This enables the device to return to the same state that
it was at the last write to the EEPROM, before it was
powered off. The POR status is monitored by the POR
status bit by using the I2C read command. See
Figure 5-15 for the details of the POR status bit.
4.2
Reset Conditions
The device can be reset by two independent events:
a)
by Power-on Reset
b)
by I2C General Call Reset Command
Under the reset conditions, the device uploads the
EEPROM data into both of the DAC input and output
registers simultaneously. The analog output voltage of
each channel is available immediately, regardless of
the LDAC and UDAC bit conditions.
The factory default settings for the EEPROM prior to
the device shipment are shown in Table 4-2.
4.3
Output Amplifier
The DAC output is buffered with a low power precision
amplifier. This amplifier provides low offset voltage and
low noise, as well as rail-to-rail output.
The output amplifier can drive the resistive and high
capacitive loads without oscillation. The amplifier can
provide a maximum load current of 24 mA, which is
enough for most of programmable voltage reference
applications.
Refer
to
Characteristics” for the specifications of the output
amplifier.
4.3.1
PROGRAMMABLE GAIN BLOCK
The rail-to-rail output amplifier of each channel has
configurable gain option. When the internal voltage
reference is selected, the output amplifier gain has two
selection options: Gain of 1 or Gain of 2.
When the external reference is selected (VREF =VDD),
the Gain of 2 option is disabled, and only the Gain of 1
is used by default.
4.3.1.1
Resistive and Capacitive Loads
The analog output (VOUT) pin is capable of driving
capacitive loads up to 1000 pF in parallel with 5 k
Ω
Resistive Load.
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