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CRCW06030000Z0EA Datasheet(PDF) 3 Page - Analog Devices |
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CRCW06030000Z0EA Datasheet(HTML) 3 Page - Analog Devices |
3 / 8 page Evaluation Board User Guide UG-382 Rev. A | Page 3 of 8 EVALUATION BOARD HARDWARE POWER SUPPLIES AGND and DGND are connected together on the board to provide a single GND signal. To power the EVAL-AD5700-1EBZ, supply 3.3 V between the VCC and GND inputs for the analog supply of the AD5700/AD5700-1. With L5 inserted (default), this also provides power to IOVCC. LINK OPTIONS A number of links on the evaluation board must be set for the required operating setup before using the board. The functions of these link options are described in detail in Table 2. The default setup is using the on-chip reference, the crystal oscillator, and the internal receive filter (see Table 1). Table 1. Default Link Options Link No. Option CLK_CFG1 A CLK_CFG0 A XTAL_EN A FILTER_SEL B L1 A L2 A REF_EN B DUPLEX A L5 Inserted L6 Not inserted L8 Inserted Table 2. Link Functions Link No. Function CLK_CFG1, CLK_CFG0, XTAL_EN The AD5700/AD5700-1 support numerous clocking configurations to allow a simple, low cost solution. The AD5700/AD5700-1 can use an external crystal or ceramic resonator, a CMOS input, or an internal RC oscillator (AD5700-1 only). The CLK_CFG0, CLK_CFG1, and XTAL_EN links configure the clock generation as follows: XTAL_EN CLK_CFG1 CLK_CFG0 CLKOUT Description B A A No output 3.6864 MHz CMOS clock connected at XTAL1 pin B A B No output 1.2288 MHz CMOS clock connected at XTAL1 pin B B A No output Internal oscillator enabled B B B 1.2288 MHz output Internal oscillator enabled, CLKOUT enabled A A A No output Crystal oscillator enabled A A B 3.6864 MHz output Crystal oscillator enabled, CLKOUT enabled A B A 1.8432 MHz output Crystal oscillator enabled, CLKOUT enabled A B B 1.2288 MHz output Crystal oscillator enabled, CLKOUT enabled FILTER_SEL, L1, L2 These link options set whether the internal or external receive band-pass filter is used at the HART input. Setting FILTER_SEL to Position B and L1 and L2 to Position A sets the board to use the internal receive band-pass filter. Setting FILTER_SEL to Position A and L1 and L2 to Position B sets the board to use the external receive band-pass filter. REF_EN This sets whether the internal or an external reference is used. Position A—disables the internal reference, and a buffered external 2.5 V reference source must be applied at REF. Position B—enables the internal 1.5 V reference and buffer. DUPLEX Allows the modulator and demodulator of the AD5700/AD5700-1 to be enabled at the same time. Position A—the AD5700/AD5700-1 operate in half-duplex operation (controlled by RTS). Position B—the AD5700/AD5700-1 operate in full duplex operation, with the modulator and demodulator of the AD5700/AD5700-1 enabled at the same time. L5 Allows VCC to be connected directly to IOVCC. Inserted—VCC is connected to IOVCC. Not inserted—VCC is disconnected from IOVCC. L6 Do not insert this link. L8 This link must be inserted. |
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