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CDK1308BILP40 Datasheet(PDF) 11 Page - Cadeka Microcircuits LLC.

Part # CDK1308BILP40
Description  Ultra Low Power, 20/40/65/80MSPS, 10-bit Analog-to-Digital Converters (ADCs)
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Manufacturer  CADEKA [Cadeka Microcircuits LLC.]
Direct Link  http://www.cadeka.com
Logo CADEKA - Cadeka Microcircuits LLC.

CDK1308BILP40 Datasheet(HTML) 11 Page - Cadeka Microcircuits LLC.

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©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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