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MAX5151AEEE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX5151AEEE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page The address and control bits determine the MAX5150/ MAX5151's response, as outlined in Table 1. The MAX5150/MAX5151's digital inputs are double buffered, which allows any of the following: loading the input register(s) without updating the DAC register(s), updating the DAC register(s) from the input register(s), or updating the input and DAC registers concurrently. The address and control bits allow the DACs to act independently. The 16-bit data can be sent as two 8-bit packets (SPI, Microwire), with CS low during this period. The address and control bits determine which register will be updat- ed, and the state of the registers when exiting shut- down. The 3-bit address/control determines the following: • registers to be updated • clock edge on which data is to be clocked out via the serial-data output (DOUT) • state of the user-programmable logic output • configuration of the device after shutdown. The general timing diagram of Figure 5 illustrates how data is acquired. Driving CS low enables the device to receive data. Otherwise, the interface control circuitry is disabled. With CS low, data at DIN is clocked into the register on the rising edge of SCLK. As CS goes high, data is latched into the input and/or DAC registers depending on the address and control bits. The maxi- mum clock frequency guaranteed for proper operation is 10MHz. Figure 6 depicts a more detailed timing dia- gram of the serial interface. Low-Power, Dual, 13-Bit Voltage-Output DACs with Serial Interface DIN SCLK CS MOSI SCK I/O SPI/QSPI PORT SS +5V CPOL = 0, CPHA = 0 MAX5150 MAX5151 Figure 3. Connections for SPI/QSPI Figure 5. Serial-Interface Timing Diagram CS SCLK DIN COMMAND EXECUTED 9 8 16 1 C1 A0 D0 C0 D12 D11 D10 D9 D6 D5 D4 D3 D2 D1 D8 D7 ______________________________________________________________________________________ 11 MSB.......Data Bits.........LSB D12.................................D0 13 Data Bits 16 Bits of Serial Data Control Bits C1, C0 Address Bits MSB ..................................................................................LSB A0 1 Address/2 Control Bits Figure 4. Serial-Data Format |
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