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ADG2188 데이터시트(PDF) 18 Page - Analog Devices |
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ADG2188 데이터시트(HTML) 18 Page - Analog Devices |
18 / 28 page ADG2188 Rev. 0 | Page 18 of 28 THEORY OF OPERATION The ADG2188 is an analog cross point switch with an array size of 8 × 8. The eight rows are referred to as the X input/output lines, and the eight columns are referred to as the Y input/output lines. The device is fully flexible in that it connects any X line or number of X lines with any Y line when turned on. Similarly, it connects any X line with any number of Y lines when turned on. Control of the ADG2188 is carried out via an I2C interface. The device can be operated from single supplies of up to 13.2 V or from dual ±5 V supplies. The ADG2188 has many attractive features, such as the ability to reset all the switches, the ability to update many switches at the same time, and the option of reading back the status of any switch. All of these features are described in more detail here in the Theory of Operation section. RESET/POWER-ON RESET The ADG2188 offers the ability to reset all of the 64 switches to the off state. This is done through the RESET pin. When the RESET pin is low, all switches are open (off), and appropriate registers are cleared. Note that the ADG2188 also has a power- on reset block. This ensures that all switches are in the off condition at power-up of the device. In addition, all internal registers are filled with 0s and remain so until a valid write to the ADG2188 takes place. LOAD SWITCH (LDSW) LDSW is an active high command that allows a number of switches to be simultaneously updated. This is useful in applications where it is important to have synchronous transmission of signals. There are two LDSW modes: the transparent mode and the latched mode. Transparent Mode In this mode, the switch position changes after the new word is written into the input shift register. LDSW is set to 1. Latched Mode In this mode, the switch positions are not updated at the same time that the input registers are written to. This is achieved by setting LDSW to 0 for each word (apart from the last word) written to the device. Then, setting LDSW to 1 for the last word allows all of the switches in that sequence to be simultaneously updated. READBACK Readback of the switch array conditions is also offered when in standard mode and fast mode. Readback enables the user to check the status of the switches of the ADG2188. This is very useful when debugging a system. |
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