AD7834和AD7835均在单芯片上集成四个14位DAC，输出电压范围为±8.192 V，输出电压最大跨度为14 V。
The AD7834 is a serial input device. Data is loaded into a DAC from an external serial bus via DIN, SCLK, and FSYNC in 16-bit format, with 0 for the first two bits, and then preferentially loaded into the MSB. The AD7834 has five dedicated package address pins PA0 through PA4; In multi-package applications, these pins can be connected to AGND or VCC to address each device for up to 32 AD7834s.
The AD7835 can accept either 14-bit parallel loading or dual-byte loading, with right-aligned data loaded as one 8-bit byte and one 6-bit byte. Under the control of WR, CS, BYSHF and DAC channel address pins A0 to A2, data is loaded from the external bus into one of the input latches.
For each device, the outputs of all four DACs can be updated simultaneously using the LDAC signal or individually when new data is received. In addition, for each device, all signal outputs VOUT1 to VOUT4 can be set to user-defined levels on the device's reference ground pin DSG using the asynchronous CLR input. On power-up, the internal circuitry keeps the DAC output level within ±2 V of the DSG potential until the power supply reaches a steady state. After the power supply stabilizes, the DAC output level is accurately shifted to the DSG potential (assuming the CLR function is used).
The AD7834 is available in 28-pin 0.3" SOIC and 28-pin 0.6" PDIP packages, and the AD7835 is available in 44-pin MQFP and 44-pin PLCC packages.
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