HT7512ARTZ

The HT7512A is a single, 12-bit buffered voltage out digital-to-analog converter (DAC) that operates from a single 2.7 V to 5.5 V supply consuming 115 μA at 3 V. Its on-chip precision output amplifier allows rail-to-rail output swing to be achieved. The HT7512A utilizes a versatile 3-wire serial interface that operates at clock rates up to 30 MHz and is compatible with standard SPI, QSPI, MICROWIRE and digital signal processing (DSP) interface standards. The reference for HT7512A is derived from the power supply inputs and thus gives the widest dynamic output range. The part incorporates a power-on reset circuit that ensures that the DAC output powers up to zero volts and remains there until a valid write takes place to the device. The part contains a power-down feature that reduces the current consumption of the device to 200 nA at 5 V and provides software selectable output loads while in power-down mode. The part is put into power-down mode over the serial interface. The low power consumption of this part in normal operation makes it ideally suited to portable, battery-operated equipment. The power consumption is 0.7 mW at 5 V reducing to 1 μW in power-down mode.

Applications

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

Key features

• Single 12-bit DAC
• 6-lead SOT-23 and 8-lead MSOP packages
• Micropower operation: 140 pA @ 5 V
• Power-down to 200 nA @ 5 V, 50 nA @ 3 V
• 2.7 V to 5.5 V power supply
• Guaranteed monotonic by design
• Reference derived from power supply
• Power-on reset to zero volts
• Three power-down functions
• Low power serial interface with Schmitt-triggered inputs
• On-chip output buffer amplifier, rail-to-rail operation
• SYNC interrupt facility