The AD5378 contains 32 14-bit DACs in one CSPBGA package.The AD5378 provides a bipolar output range determined by the voltages applied to the VREF(+) and VREF(?) inputs. The maximum output voltage span is 17.5 V, corresponding to a bipolar output range of ?8.75 V to +8.75 V, and is achieved with reference voltages of VREF(?) = ?3.5 V and VREF(+) = +5 V.

The AD5378 guarantees operation over a wide VSS/VDD supply range from ±11.4 V to ±16.5 V. The output amplifier headroom requirement is 2.5 V operating with a load current of 1.5 mA, and 2 V operating with a load current of 0.5 mA.

The AD5378 contains a double-buffered parallel interface inwhich 14 data bits are loaded into one of the input registers under the control of the WR, CS, and DAC channel address pins, A0 to A7. It also has a 3-wire serial interface, which is compatible with SPI, QSPI?, MICROWIRE?, and DSP interface standards and can handle clock speeds of up to 50 MHz.

The DAC outputs are updated when the DAC registers receive new data. All the outputs can be updated simultaneously by taking the LDAC input low. Each channel has a programmable gain and an offset adjust register.

Each DAC output is gained and buffered on-chip with respect to an external REFGND input. The DAC outputs can also be switched to REFGND via the CLR pin. Table 1 and Table 2 show the product portfolio for high channel count bipolar andunipolar voltage output DACs.

Applications

• AD5174 - 单通道、1024位数字变阻器，配有SPI接口和50-TP存储器
• HMC398 - MMIC VCO SMT，8分频，14 - 15 GHz
• DAC312 - 12位高速乘法D/A转换器
• HMC3653 - HBT增益模块MMIC放大器，7 - 15 GHz
• ADA4950-2 - 低功耗、可选增益差分ADC驱动器，G = 1、2、3
• AD8352 - 2 GHz超低失真差分射频/中频放大器
• AD7440 - 差分输入、1 MSPS、12 位ADC (AD7450A) 和10位ADC (AD7440)
• AD8236 - 40 μA微功耗仪表放大器
• AD8613 - 微功耗、低噪声、低成本CMOS RRIO单通道运算放大器
• AD5612 - 2.7 V至5.5 V、小于100nanoA、10位NANODAC?数模转换器，内置I2C兼容型接口，采用SC70小型封装