SNAS395F December 2007 – October 2016 DAC121C081 , DAC121C085
PRODUCTION DATA.
The DAC121C081 is a 12-bit, single-channel, voltage-output digital-to-analog converter (DAC) that operates from a 2.7-V to 5.5-V supply. The output amplifier allows rail-to-rail output swing and has an 8.5-µs settling time. The DAC121C081 uses the supply voltage as the reference to provide the widest dynamic output range, and typically consumes 132 µA while operating at 5 V. It is available in 6-pin SOT and WSON packages, and provides three address options (pin selectable).
As an alternative, the DAC121C085 provides nine I2C addressing options and uses an external reference. It has the same performance and settling time as the DAC121C081, and is available in an 8-lead VSSOP.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
DAC121C081 | WSON (6) | 2.20 mm × 2.50 mm |
SOT (6) | 1.60 mm × 2.90 mm | |
DAC121C085 | VSSOP (8) | 3.00 mm × 3.00 mm |
Changes from E Revision (January 2016) to F Revision
Changes from D Revision (March 2013) to E Revision
Changes from C Revision (March 2013) to D Revision
The DAC121C081 and DAC121C085 use a 2-wire, I2C-compatible serial interface that operates in all three speed modes, including high-speed mode (3.4 MHz). An external address selection pin allows up to three DAC121C081 or nine DAC121C085 devices per 2-wire bus. Pin compatible alternatives to the DAC121C081 are available that provide additional address options.
The DAC121C081 and DAC121C085 each have a 16-bit register that controls the mode of operation, the power-down condition, and the output voltage. A power-on reset circuit ensures that the DAC output powers up to 0 V. A power-down feature reduces power consumption to less than a microWatt. Their low power consumption and small packages make these DACs an excellent choice for use in battery-operated equipment. Each DAC operates over the extended industrial temperature range of −40°C to +125°C.
The DAC121C081 and DAC121C085 are each part of a family of pin compatible DACs that also provide 8 and 10 bit resolution. For 8-bit DACs see the DAC081C081 and DAC081C085. For 10-bit DACs see the DAC101C081 and DAC101C085.
PIN | TYPE | DESCRIPTION | EQUIVALENT CIRCUIT | |||
---|---|---|---|---|---|---|
NAME | WSON | SOT | VSSOP | |||
ADR0 | 1 | 6 | 1 | Digital Input, three levels |
Tri-state Address Selection Input. Sets the two Least Significant Bits (A1 and A0) of the 7-bit slave address. (see Table 1) |
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ADR1 | — | — | 2 | Digital Input, three levels |
Tri-state Address Selection Input. Sets Bits A6 and A3 of the 7-bit slave address. (see Table 1) | |
GND | 4 | 3 | 5 | Ground | Ground for all on-chip circuitry | — |
SCL | 2 | 5 | 3 | Digital Input | Serial Clock Input. SCL is used together with SDA to control the transfer of data in and out of the device. |
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SDA | 3 | 4 | 4 | Digital Input/Output |
Serial Data bi-directional connection. Data is clocked into or out of the internal 16-bit register relative to the clock edges of SCL. This is an open-drain data line that must be pulled to the supply (VA) by an external pullup resistor. | |
VOUT | 6 | 1 | 8 | Analog Output | Analog Output Voltage | — |
VA | 5 | 2 | 6 | Supply | Power supply input. For the SOT and WSON versions, this supply is used as the reference. Must be decoupled to GND. | — |
VREF | — | — | 7 | Supply | Unbufferred reference voltage. For the VSSOP, this supply is used as the reference. VREF must be free of noise and decoupled to GND. | — |
PAD | (LLP only) | — | — | Ground | Exposed die attach pad can be connected to ground or left floating. Soldering the pad to the PCB offers optimal thermal performance and enhances package self-alignment during reflow. | — |