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MAX5253 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX5253 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page In shutdown mode, the MAX5253 output amplifiers and the reference inputs enter a high-impedance state. The serial interface remains active. Data in the input regis- ters is retained in shutdown, allowing the MAX5253 to recall the output states prior to entering shutdown. Exit shutdown mode by either recalling the previous config- uration or by updating the DACs with new data. When powering up the device or bringing it out of shutdown, allow 20µs for the outputs to stabilize. Serial-Interface Configurations The MAX5253’s 3-wire serial interface is compatible with both Microwire™ (Figure 2) and SPI™/QSPI™ (Figure 3). The serial input word consists of two address bits and two control bits followed by 12 data bits (MSB first), as shown in Figure 4. The 4-bit address/ control code determines the MAX5253’s response out- lined in Table 1. The connection between DOUT and the serial-interface port is not necessary, but may be used for data echo. Data held in the MAX5253’s shift register can be shifted out of DOUT and returned to the microprocessor (µP) for data verification. The MAX5253’s digital inputs are double buffered. Depending on the command issued through the serial interface, the input register(s) can be loaded without affecting the DAC register(s), the DAC register(s) can be loaded directly, or all four DAC registers can be updated simultaneously from the input registers (Table 1). Serial-Interface Description The MAX5253 requires 16 bits of serial data. Table 1 lists the serial-interface programming commands. For certain commands, the 12 data bits are “don’t cares.” Data is sent MSB first and can be sent in two 8-bit packets or one 16-bit word ( CS must remain low until 16 bits are transferred). The serial data is composed of two DAC address bits (A1, A0) and two control bits (C1,C0), followed by the 12 data bits D11…D0 (Figure 4).The 4-bit address/control code determines: • The register(s) to be updated • The clock edge on which data is to be clocked out via the serial-data output (DOUT) • The state of the user-programmable logic output (UPO) • If the part is to go into shutdown mode (assuming PDL is high) • How the part is configured when exiting shutdown mode. +3V, Quad, 12-Bit Voltage-Output DAC with Serial Interface _______________________________________________________________________________________ 9 SCLK DIN DOUT* CS SK SO SI* I/O MAX5253 MICROWIRE PORT *THE DOUT-SI CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX5253, BUT MAY BE USED FOR READBACK PURPOSES. Figure 2. Connections for Microwire DOUT* DIN SCLK CS MISO* MOSI SCK I/O SPI/QSPI PORT SS +3.3V CPOL = 0,CPHA = 0 *THE DOUT-MISO CONNECTION IS NOT REQUIRED FOR WRITING TO THE MAX5253, BUT MAY BE USED FOR READBACK PURPOSES. MAX5253 Figure 3. Connections for SPI/QSPI Figure 4. Serial-Data Format MSB ..................................................................................LSB 16 Bits of Serial Data Address Bits Control Bits Data Bits MSB.............................................LSB A1 A0 C1 C0 D11................................................D0 12 Data Bits 4 Address/ Control Bits |
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