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CDK1308BILP40 Datasheet(PDF) 11 Page - Cadeka Microcircuits LLC. |
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CDK1308BILP40 Datasheet(HTML) 11 Page - Cadeka Microcircuits LLC. |
11 / 14 page ©2008 CADEKA Microcircuits LLC www.cadeka.com 11 ADVANCE Data Sheet Recommended Usage Analog Input The analog inputs to the CDK1308 is a switched capacitor track-and-hold amplifier optimized for differential opera- tion. Operation at common mode voltages at mid supply is recommended even if performance will be good for the ranges specified. The CM_EXT pin provides a voltage suit- able as common mode voltage reference. The internal buffer for the CM_EXT voltage can be switched off, and driving capabilities can be changed by using the CM_EXT- BC control input. Figure 2 shows a simplified drawing of the input net- work. The signal source must have sufficiently low output impedance 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 tran- sient currents and dampens ringing behavior. A small dif- ferential shunt capacitor at the chip side of the resistors may be used to provide dynamic charging currents and may improve performance. The resistors form a low pass filter with the capacitor, and values must therefore be de- termined 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 CDK1308 input specifications. Figure 3. DC-Coupled Input Detailed configuration and usage instructions must be found in the documentation of the selected driver, and the values given in Figure 3 must be varied according to the recommendations for the driver. AC-Coupling A signal transformer or series capacitors can be used to make an AC-coupled input network. Figure 4 shows CLK_EXT N-13 N+1 N+2 N+3 N+4 N+5 N Figure 1. Timing Diagram pF |
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