MCP4728

Part: MCP4728

Type: 12-Bit Quad Digital-to-Analog Converter

Description: 2.7–5.5 V 12-bit quad buffered voltage output DAC with nonvolatile EEPROM memory, internal 2.048 V reference, and I2C interface supporting up to 3.4 Mbps.

Operating Conditions:

• Supply voltage: 2.7–5.5 V
• Operating temperature: -40 to +125 °C

Absolute Maximum Ratings:

• Max supply voltage: 6.5 V
• Max continuous current: ±110 mA (Current at Supply Pins)
• Max junction/storage temperature: +150 °C

Key Specs:

• Resolution: 12 bits
• DNL: ±0.2 LSB typical, ±0.75 LSB max
• INL: ±2 LSB typical, ±13 LSB max
• Settling time: 6 μs typical
• Internal voltage reference: 2.048 V (2.007 V min, 2.089 V max)
• Full-scale output range: 0.000 V to VDD (external ref) or 0.000 V to 2.048 V / 4.096 V (internal ref)
• Supply current: 800 μA typical, 1400 μA max (all 4 channels in Normal mode, VDD = 5.5 V)
• Power-down current: 40 nA typical (external ref), 45 μA typical (internal ref)

Features:

• Four buffered 12-bit voltage output DAC channels with rail-to-rail swing
• On-board nonvolatile EEPROM stores DAC input codes, configuration settings, and I2C address bits
• Selectable internal (2.048 V) or external (VDD) reference per channel
• Individual channel normal or selectable power-down modes
• I2C serial interface supporting Standard (100 kbps), Fast (400 kbps), and High-Speed (3.4 Mbps) modes
• LDAC pin for simultaneous output update

Applications:

• Set point or offset adjustment
• Sensor calibration
• Closed-loop servo control
• Low power portable instrumentation
• PC peripherals
• Programmable voltage and current source
• Industrial process control
• Instrumentation
• Bias voltage adjustment for power amplifiers

Package:

• 10-lead MSOP

• 12-Bit Voltage Output DAC with Four Buffered Outputs
• On-Board Nonvolatile Memory (EEPROM) for DAC Codes and I 2 C™ Address Bits
• Internal or External Voltage Reference Selection
• Output Voltage Range:
• -Using Internal V REF (2.048V): 0.000V to 2.048V with Gain Setting = 1 0.000V to 4.096V with Gain Setting = 2
• -Using External V REF (V DD ): 0.000V to V DD
• ±0.2 Least Significant Bit (LSB) Differential Nonlinearity (DNL) (typical)
• Fast Settling Time: 6 μs (typical)
• Normal or Power-Down Mode
• Low Power Consumption
• Single-Supply Operation: 2.7V to 5.5V
• I 2 C Interface:
• -Address bits: User Programmable to EEPROM
• -Standard (100 kbps), Fast (400 kbps) and High Speed (HS) Mode (3.4 Mbps)
• 10-Lead MSOP Package
• Extended Temperature Range: -40°C to +125°C

• Set Point or Offset Adjustment
• Sensor Calibration
• Closed-Loop Servo Control
• Low Power Portable Instrumentation
• PC Peripherals
• Programmable Voltage and Current Source
• Industrial Process Control
• Instrumentation
• Bias Voltage Adjustment for Power Amplifiers

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: PIN FUNCTION TABLE

Legend: P = Power, OI = Open-Drain Input, OO = Open-Drain Output, ST = Schmitt Trigger Input Buffer, AO = Analog Output

Note 1: This pin needs an external pull-up resistor from V DD line. Leave this pin float if it is not used.

• 2: This pin can be driven by MCU.

Electrical Specifications: Unless otherwise indicated, all parameters apply at V DD = +2.7V to 5.5V, V SS = 0V, RL = 5 k Ω , C L = 100 pF, G X = 1, T A = -40°C to +125°C. Typical values are at +25°C, V IH = V DD , V IL = V SS.

Note 1: All digital input pins (SDA, SCL, LDAC) are tied to 'High', Output pins are unloaded, code = 0 x 000.

• 2: The power-up ramp rate measures the rise of V DD over time.
• 3: This parameter is ensured by design and not 100% tested.
• 4: This parameter is ensured by characterization and not 100% tested.
• 5: Test code range: 100 - 4000 codes, V REF = V DD , V DD = 5.5V.
• 6: Time delay to settle to a new reference when switching from external to internal reference or vice versa.
• 7: This parameter is indirectly tested by Offset and Gain error testing.
• 8: Within 1/2 LSB of the final value when code changes from 1/4 of to 3/4 of full scale.
• 9: This time delay is measured from the falling edge of ACK pulse in I 2 C command to the beginning of V OUT . This time delay is not included in the output settling time specification.
• † Notice: Stresses above those listed under 'Maximum ratings' may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.

The MCP4728 device is a part of Microchip's latest DAC family with nonvolatile EEPROM memory. The device is a general purpose resistor string DAC intended to be used in applications where a precise and low power DAC, with moderate bandwidth, is required.

Since the device includes nonvolatile 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