HT7512A Datasheet | HTCSEMI

FEATURES Single 12-bit DAC 6-lead SOT-23 and 8-lead MSOP packages Micropower operation: 140 μA @ 5 V Power-down to 200 n A @ 5 V, 50 n A @ 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 interruptfacility APPLICATIONS Portable battery-powered instruments Digital gain and offset adjustment Programmable voltage and current sources Programmable attenuators FUNCTIONAL BLOCK DIAGRAM POWER-ON RESET VDD GND B HT7512A DAC REGISTER REF (+) REF (- ) 12-BIT DAC OUTPUT BUFFER VOUT INPUT CONTROL LOGIC POWER-DOWN CONTROL LOGIC REGISTER NETWORK 00934-001 SYNC SCLK DIN Figure 1. GENERAL DESCRIPTION The HT7512A1 is a single, 12-bit buffered voltage out digitalto- 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 patible 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 powerdown feature that reduces the current consumption of the device to 200 n A at 5 V and provides software selectable output loads while in power-down mode. The part is put into powerdown mode over the serial interface. PRODUCT HIGHLIGHTS 1. Available in 6-lead SOT-23 and 8-lead MSOP packages. 2. Low power, single-supply operation. This part operates from a single 2.7 V to 5.5 V supply and typically...