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CDK2307DILP64X Datasheet(PDF) 11 Page - Cadeka Microcircuits LLC. |
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CDK2307DILP64X Datasheet(HTML) 11 Page - Cadeka Microcircuits LLC. |
11 / 16 page ©2009 CADEKA Microcircuits LLC www.cadeka.com 11 Data Sheet Recommended Usage Analog Input The analog input to the CDK2307 is done through a switched capacitor track-and-hold amplifier optimized for differential operation. Operation at mid supply common mode voltage is recommended even if performance will be good for the ranges specified. The CM_EXT pin pro- vides a voltage suitable for a common mode voltage refer- ence. The internal buffer for the CM_EXT voltage can be switched off, and driving capabilities can be changed by using the CM_EXTBC control input. Figure 2 shows a simplified drawing of the input network. The signal source must have sufficiently low output imped- ance to charge the sampling capacitors within one clock cycle. A small external resistor (e.g. 22Ω) in series with each input is recommended as it helps reducing transient currents and dampens ringing behavior. A small differential shunt capacitor at the chip side of the resistors may be used to provide dynamic charging currents and may im- prove performance. The resistors form a low pass filter with the capacitor, and values must therefore be deter- mined by requirements for the application. Figure 2. Input Configuration DC-Coupling Figure 3 shows a recommended configuration for DC- coupling. Note that the common mode input voltage must be controlled according to specified values. Preferably, the CM_EXT output should be used as a reference to set the common mode voltage. The input amplifier could be inside a companion chip or it could be a dedicated amplifier. Several suitable single ended to differential driver amplifiers exist in the market. The system designer should make sure the specifications of the selected amplifier is adequate for the total system, and that driving capabilities comply with the CDK2307 input specifications. Figure 3. DC-Coupled Input Detailed configuration and usage instructions must be found in the documentation of the selected driver. AC-Coupling A signal transformer or series capacitors can be used to make an AC-coupled input network. Figure 4 shows a recommended configuration using a transformer. Make sure that a transformer with sufficient linearity is selected, CLK_EXT N-13 +F0 +F2 +F1 +F4 +F + Figure 1. Timing Diagram pF |
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