MCP4728-E/UN Microchip Technology, MCP4728-E/UN Datasheet - Page 51

• 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

7.0
The MCP4728 device is a part of Microchip’s latest
DAC family with non-volatile EEPROM memory. The
device is a general purpose resistor string DAC
intended to be used in applications where a precision,
and low power DAC with moderate bandwidth is
required.
Since the device includes non-volatile EEPROM
memory, the user can use this device for applications
that require the output to return to the previous set-up
value on subsequent power-ups.
Applications generally suited for the MCP4728 device
family include:
• Set Point or Offset Trimming
• Sensor Calibration
• Portable Instrumentation (Battery Powered)
• Motor Speed Control
FIGURE 7-1:
© 2009 Microchip Technology Inc.
TYPICAL APPLICATIONS
R
3
Example of the MCP4728 Device Connection.
R
R
R
C
C
1
1
3
1
2
- R
: ~ 100 kΩ
: 0.1 µF, Ceramic capacitor
: 10 µF, Tantalum capacitor
R
and R
2
3
are the pull-up resistors:
RDY/BSY
R
2
1
:
5 kΩ - 10 kΩ for f
LDAC
SDA
SCL
V
DD
~700Ω for f
1
2
3
4
5
MCP4728
SCL
SCL
C
1
=
=
100 kHz to 400 kHz
3.4 MHz
10
9
8
7
6
7.1
The SCL, SDA, and RDY/BSY pins of the MCP4728
device are open-drain configurations. These pins
require a pull-up resistor as shown in
LDAC pin has a schmitt trigger input configuration and
it can be driven by an external MCU I/O pin.
The pull-up resistor values (R1 and R2) for SCL and
SDA pins depend on the operating speed (standard,
fast, and high speed) and loading capacitance of the
I
less power, but increases the signal transition time
(higher RC time constant) on the bus line. Therefore, it
can limit the bus operating speed. A lower resistor
value, on the other hand, consumes higher power, but
allows for higher operating speed. If the bus line has
higher capacitance due to long metal traces or multiple
device connections to the bus line, a smaller pull-up
resistor is needed to compensate the long RC time
constant. The pull-up resistor is typically chosen
between 1 kΩ and 10 kΩ ranges for standard and fast
modes, and less than 1 kΩ for high speed mode.
2
C bus line. Higher value of pull-up resistor consumes
V
V
V
V
V
C
SS
OUT
OUT
OUT
OUT
2
D
C
B
A
Connecting to I
Pull-Up Resistors
V
DD
Analog Outputs
To MCU
2
MCP4728
C BUS using
DS22187A-page 51
Figure
7-1. The