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參數(shù)資料
| 型號(hào)： | MCP4728EV |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 15/33頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL 12BIT 4CH DAC MCP4728 |
| 視頻文件： | MCP4728 Evaluation Board Demo |
| 標(biāo)準(zhǔn)包裝： | 1 |
| DAC 的數(shù)量： | 4 |
| 位數(shù)： | 12 |
| 數(shù)據(jù)接口： | I²C |
| 設(shè)置時(shí)間： | 6µs |
| DAC 型： | 電壓 |
| 工作溫度： | -40°C ~ 125°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP4728 |
| 產(chǎn)品目錄頁面： | 673 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)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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MCP4728
DS22187E-page 22
2010 Microchip Technology Inc.
3.3
Serial Data Pin (SDA)
SDA is the serial data pin of the I2C interface. The SDA
pin is used to write or read the DAC register and
EEPROM data. Except for Start and Stop conditions,
the data on the SDA pin must be stable during the high
duration of the clock pulse. The High or Low state of the
SDA pin can only change when the clock signal on the
SCL pin is Low.
The SDA pin is an open-drain N-channel driver.
Therefore, it needs a pull-up resistor from the VDD line
to the SDA pin.
Refer
to
Interface communication.
3.4
LDAC Pin
This pin can be driven by an external control device
such as an MCU I/O pin. This pin is used to:
a)
transfer the contents of the input registers to
their corresponding DAC output registers and
b)
select a device of interest when reading or writ-
ing I2C address bits.
For more details on reading and writing the I2C address
bits, see
When the logic status of the LDAC pin changes from
“High” to “Low”, the contents of all input registers
(Channels A – D) are transferred to their corresponding
output registers, and all analog voltage outputs are
updated simultaneously.
If this pin is permanently tied to “Low”, the content of
the input register is transferred to its output register
(VOUT) immediately at the last input data byte’s
acknowledge pulse.
The user can also use the UDAC bit instead. However,
the UDAC bit updates a selected channel only. See
Section 4.8 “Output Voltage Update” for more
information on the LDAC pin and UDAC bit functions.
3.5
RDY/BSY Status Indicator Pin
This pin is a status indicator of EEPROM programming
activity. This pin is “High” when the EEPROM has no
programming activity, and “Low” when the EEPROM is
in programming mode. It goes “High” when the
EEPROM program is completed.
The RDY/BSY pin is an open-drain N-channel driver.
Therefore, it needs a pull-up resistor (about 100 k
Ω)
from the VDD line to the RDY/BSY pin. Let this pin float
if it is not used.
3.6
Analog Output Voltage Pins
(VOUT A, VOUT B, VOUT C, VOUT D)
The device has four analog voltage output (VOUT) pins.
Each output is driven by its own output buffer with a
gain of 1 or 2, depending on the gain and VREF
selection bit settings. In Normal mode, the DC
impedance of the output pin is about 1
Ω. In
Power-Down mode, the output pin is internally
connected to 1 k
Ω, 100 kΩ, or 500 kΩ, depending on
the Power-Down selection bit settings.
The VOUT pin can drive up to 1000 pF of capacitive
load. It is recommended to use a load with RL greater
than 5 k
Ω.
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