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ADP7104ARDZ-33 Datasheet(PDF) 8 Page - Analog Devices |
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ADP7104ARDZ-33 Datasheet(HTML) 8 Page - Analog Devices |
8 / 32 page UG-609 EVAL-AD7903SDZ User Guide Rev. 0 | Page 8 of 32 EVALUATION BOARD HARDWARE DEVICE DESCRIPTION The AD7903 is a 16-bit, 1 MSPS, precision, power efficient, dual differential PulSAR ADC that uses SAR-based architecture and does not exhibit any pipeline delay or latency. The AD7903 is specified for use with a single supply of 2.5 V (VDD1, VDD2). The interface from the digital host to the AD7903 uses 1.8 V/ 2.5 V/3.3 V/5.5 V logic. The AD7903 is compatible with the SPI/QSPI/MICROWIRE/DSP serial interface to transfer data conversions. Complete AD7903 specifications are provided in the AD7903 data sheet and should be consulted in conjunction with this user guide when using the evaluation board. Full details on the EVAL-SDP-CB1Z are available on the Analog Devices website, at www.analog.com. Figure 26 to Figure 31 show the evaluation board schematics. The board consists of an AD7903 ADC (U1) with a reference (U6—ADR435), and several ADC drivers (U12, U14, U16, and U17—ADA4841-1YRZ). The evaluation board is a flexible design that enables you to adjust compensation components and operate the evaluation board from an adjustable bench top power supply. POWER SUPPLIES The evaluation board can be powered from a wall adapter or from a bench top power supply. By default, the board is set up to operate from a 9 V wall adapter using the on-board power supplies described in Table 1. Table 1. Power Supplies Provided on the Board Power Supply (V) Function Components Used +5 SDP power ADP2301 +7.5 Positive rail ADP7104 −2.5 Negative rail ADP2301 +2.5 ADC VDD rail ADP7104 +3.3 VDRIVE (digital power) ADP7104 Each on-board power supply is decoupled where it enters the board as well as where it connects to each device. A single ground plane is used on this board to minimize the effect of high frequency noise interference. Alternatively, the board can be powered from a bench top power supply by using the J2 and J3 screw terminals and changing the SL1 to SL4 and LK3 to LK5 solder link settings to Position B (see Table 2). When bench top power is used, use of the wall adapter and the on-board power supplies are no longer required. Table 2. Solder Links—Settings for Bench Top Power Supply1 Link Setting Function SL1 B +VS SL2 B −VS SL3 B −VS SL4 B +VS LK3 B V_SDP LK4 B VREF LK5 B VDD for ADC 1 All other solder link settings are as described in Table 3. |
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