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参数资料
| 型号： | MCP4725EV |
| 厂商： | Microchip Technology |
| 文件页数： | 13/50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 20
2009 Microchip Technology Inc.
5.4.2
VDD RAMP RATE AND EEPROM
The MCP4725 uploads the EEPROM data to the DAC
register during power-up sequence. However, if the
VDD ramp rate is too slow ( <1 V/ms), the device may
not be able to load the EEPROM data to the DAC
register. Therefore, the DAC output that is correspond-
ing to the current EEPROM data may not available to
the output pin. It is highly recommended to send a Gen-
eral Call Reset Command (see Section 7.3.1 “Gen-
eral call reset”) after power-up. This command will
reset the device at a stable VDD and make the DAC out-
put available immediately using the EEPROM data.
5.5
Normal and Power-Down Modes
The device has two modes of operation: Normal mode
and power-down mode. The mode is selected by
programming the power-down bits (PD1 and PD0) in
the Configuration register. The user can also program
the two power-down bits in non-volatile EEPROM
memory.
When the normal mode is selected, the device
operates a normal digital-to-analog conversion. If the
power-down mode is selected, the device enters a
power saving condition by shutting down most of the
internal circuits. During the power-down mode, all
internal circuits except the I2C interface are disabled
and there is no data conversion event, and no VOUT is
available. The device also switches the output stage
from the output of the amplifier to a known resistive
load. The value of the resistive load is determined by
the state of the power-down bits (PD1 and PD0).
Table 5-2 shows the outcome of the power-down bit
and the resistive load.
During the power-down mode, the device draws about
60 nA (typical). Although most of internal circuits are
shutdown, the serial interface remains active in order
to receive the I2C command.
The device exits the power-down mode immediately
when (a) it receives a new write command for normal
mode or (b) it receives an I2C General Call Wake-Up
Command.
When the DAC operation mode is changed from
power-down to normal mode, the output settling time
takes less than 10 s, but greater than the standard
Active mode settling time (6 s, typical).
TABLE 5-2:
POWER-DOWN BITS
FIGURE 5-1:
Output Stage for Power-
Down Mode.
PD1
PD0
Function
00
Normal Mode
01
1k resistor to ground (1)
10
100 k resistor to ground (1)
11
500 k resistor to ground (1)
Note 1: In the power-down mode: VOUT is off and
most of internal circuits are disabled.
1k
100 k 500 k
Power-Down
Control Circuit
Resistive
Load
VOUT
OP
Amp
Resistive String DAC
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