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ADS5545 Datasheet(PDF) 34 Page - Texas Instruments

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Part No. ADS5545
Description  11-BIT, 200 MSPS ADC
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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ADS5545 Datasheet(HTML) 34 Page - Texas Instruments

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Input Common-Mode
200MSPS
(342 A
m ) xFs
(1)
Reference
VCM
REFM
REFP
INTREF
INTREF
EXTREF
Internal
Reference
Internal Reference
ADS5517
SLWS203 – DECEMBER 2007
To ensure a low-noise common-mode reference, the VCM pin is filtered with a 0.1-
µF low-inductance capacitor
connected to ground. The VCM pin is designed to directly drive the ADC inputs. The input stage of the ADC
sinks a common-mode current in the order of 342
µA (at 200 MSPS). Equation 1 describes the dependency of
the common-mode current and the sampling frequency.
This equation helps to design the output capability and impedance of the CM driving circuit accordingly.
ADS5517 has built-in internal references REFP and REFM, requiring no external components. Design schemes
are used to linearize the converter load seen by the references; this and the integration of the requisite reference
capacitors on-chip eliminates the need for external decoupling. The full-scale input range of the converter can be
controlled in the external reference mode as explained below. The internal or external reference modes can be
selected by controlling the MODE pin 23 (see Table 7 for details) or by programming the serial interface register
bit <REF> (Table 16).
Figure 38. Reference Section
When the device is in internal reference mode, the REFP and REFM voltages are generated internally.
Common-mode voltage (1.5 V nominal) is output on VCM pin, which can be used to externally bias the analog
input pins.
34
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS5517


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