MCP4728-E/UN Microchip Technology, MCP4728-E/UN Datasheet - Page 22

• Manufacturer Part Number: MCP4728-E/UN
• Description: IC DAC 12BIT W/I2C 10-MSOP
• Manufacturer: Microchip Technology

Specifications of MCP4728-E/UN

• Number Of Converters: 4
• Settling Time: 6µs
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Number Of Bits: 12
• Data Interface: I²C
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Number Of Dac Outputs: 4
• Resolution: 12 bit
• Interface Type: I2C
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Supply Current: 110 mA
• Voltage Reference: 2.048 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP4728EV - BOARD EVAL 12BIT 4CH DAC MCP4728
• Power Dissipation (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MCP4728
3.3
SDA is the serial data pin of the I
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 V
to the SDA pin.
Refer
Communications”
Interface communication.
3.4
This pin can be driven by an external control device
such as an MCU I/O pin. This pin is used to:
a)
b)
For more details on reading and writing the I
bits, see
Bits”
Address bits (C2=0, C1=1,
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
(V
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”
information on the LDAC pin and UDAC bit functions.
DS22187E-page 22
OUT
transfer the contents of the input registers to
their corresponding DAC output registers and
select a device of interest when reading or writ-
ing I
and
) immediately at the last input data byte’s
to
2
Serial Data Pin (SDA)
Section 5.4.4 “General Call Read Address
LDAC Pin
C address bits.
Section 5.6.8 “Write Command: Write I2C
Section 5.0
for more details on the I
“I
C0=1)”.
2
C
2
C interface. The SDA
Serial
2
C address
for more
Interface
2
C Serial
DD
line
3.5
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 kΩ)
from the V
if it is not used.
3.6
The device has four analog voltage output (V
Each output is driven by its own output buffer with a
gain of 1 or 2, depending on the gain and V
selection bit settings. In Normal mode, the DC
impedance of the output pin is about 1Ω. In
Power-Down mode, the output pin is internally
connected to 1 kΩ, 100 kΩ, or 500 kΩ, depending on
the Power-Down selection bit settings.
The V
load. It is recommended to use a load with R
than 5 kΩ.
OUT
RDY/BSY Status Indicator Pin
Analog Output Voltage Pins
(V
DD
pin can drive up to 1000 pF of capacitive
OUT
line to the RDY/BSY pin. Let this pin float
A
,
V
OUT
© 2010 Microchip Technology Inc.
B
,
V
OUT
C
,
V
OUT
OUT
L
greater
D)
) pins.
REF