The AD5648 is a low-power, eight-channel, 14-bit, buffered voltage output DAC that operates from a single 2.7 V to 5.5 V supply and is designed to be monotonious.
The AD5648 has a built-in on-chip reference with an internal gain of 2. The AD5648-1 has a built-in 1.25 V, 5 ppm/°C voltage reference with a full-scale output range of 2.5 V; The AD5648-2 has a built-in 2.5 V, 5 ppm/°C reference with a full-scale output range of 5 V. When powered on, the on-chip reference is turned off, allowing the use of an external reference. The internal voltage reference is enabled via software write.
The device has a built-in power-on reset circuit that ensures that the DAC outputs to 0 V when powered on and maintains that level until a valid write operation is performed. It also features independent shutdown for each channel, reducing the device's power consumption to 400 nA at 5 V in shutdown mode and providing a software-selectable output load.
The /LDAC function allows you to update all DAC outputs at the same time, and you can also select the DAC channel to update at the same time. There is also an asynchronous/CLR function that can update all DACs to user-programmable code: zero, medium or full scale.
The AD5648 features a versatile three-wire serial interface that operates at clock rates up to 50 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. It has a built-in on-chip precision output amplifier that enables rail-to-rail output swing.
Product features:
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八通道14位DAC。
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1.25 V/2.5 V、5 ppm/ºC片内基准电压源。
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提供14引脚/16引脚TSSOP封装。
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上电复位至0 V或中量程。
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关断功能。关断模式下，3 V时DAC的典型功耗为200 nA，5 V时为400 nA。
apply
光收发器
功率放大器控制
数据采集系统
数字增益和失调电压调整