AD5322 Datasheet

• Two 12-Bit DACS in one package
• Micropower: 300 µA @ 5 V (including Reference Current)
• Power-Down to 200 nA @ 5 V, 50nA @ 3 V
• Guaranteed Monotonic by Design
• Power-On-Reset to Zero Volts
• Buffered/Unbuffered Reference Input Options
• O-V_REF Output Voltage
• Low Power, SPI^™, QSPI^™, MICROWIRE^™ and DSP-Compatible 3-Wire Serial Interface
• Output Buffer Amplifiers with Rail-to-Rail Operation
• Simultaneous Update of DAC Outputs via LDAC pin(active low)
• Temperature Range: -40ºC to 105ºC
• Three Power-Down Functions

• Portable battery-powered instruments
• Digital gain and offset adjustment
• Programmable voltage and current sources
• Programmable attenuators

The AD5322 are dual 12-bit buffered voltage output DACs in a 10-lead µSOIC package that operate from a single +2.5 V to +5.5 V supply consuming 230 µA at 3 V. Their on-chip output amplifiers allow the outputs to swing rail-to-rail with a slew rate of 0.7 V/µs. The AD5322 utilize a versatile 3-wire serial interface which operates at clock rates up to 30 MHz and is compatible with standard SPI^™, QSPI^™, MICROWIRE^™ and DSP interface standards.

The references for the two DACs are derived from two reference pins (one per DAC). The reference inputs can be configured as buffered or unbuffered inputs. The outputs of both DACs can be updated simultaneously using the asynchronous LDAC input. The parts incorporate a power-on reset circuit, which ensures that the DAC outputs power-up to 0 V and remain there until a valid write takes place to the device. The parts contain a power-down feature that reduces the current consumption of the devices to 200 nA at 5 V (50 nA at 3 V) and provides software-selectable output loads while in power-down mode.

The low power consumption of these parts in normal operation makes them ideally suited for portable battery-operated equipment. The power consumption is 1.5 mW at 5 V, 0.7 mW at 3 V, reducing to 1 μW in power-down mode.