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ADC1215S Datasheet(PDF) 17 Page - NXP Semiconductors

Part No. ADC1215S
Description  Single 12-bit ADC; 65 Msps, 80 Msps, 105 Msps or 125 Msps with input buffer; CMOS or LVDS DDR digital outputs
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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ADC1215S Datasheet(HTML) 17 Page - NXP Semiconductors

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ADC1215S_SER_1
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Preliminary data sheet
Rev. 01 — 12 April 2010
17 of 39
NXP Semiconductors
ADC1215S series
ADC1215S series; input buffer; CMOS or LVDS DDR digital output
11.1.4 Selecting the output data format
The output data format can be selected via the SPI interface (offset binary, two’s
complement or gray code; see Table 23) or using pin DFS in Pin control mode (offset
binary or two’s complement). Offset binary is selected when DFS is LOW. When DFS is
HIGH, two’s complement is selected.
11.2 Analog inputs
11.2.1 Input stage
The analog input of the ADC1215S supports differential or single-ended input drive.
Optimal performance is achieved using differential inputs. The ADC inputs are internally
biased and need to be decoupled.
The full scale analog input voltage range is configurable between 1 V (p-p) and 2 V (p-p)
via a programmable internal reference (see Section 11.3 and Table 21 further details).
The equivalent circuit of the input buffer followed by the Sample and Hold (S/H) input
stage, including ElectroStatic Discharge (ESD) protection and circuit and package
parasitics, is shown in Figure 8.
The integrated input buffer offers the following advantages:
The kickback effect is avoided - the charge injection and glitches generated by the
S/H input stage are isolated from the input circuitry. So there’s no need for additional
filtering.
The input capacitance is very low and constant over a wide frequency range, which
makes the ADC1215S easy to drive.
Fig 8.
Input sampling circuit and input buffer
005aaa107
INP
package
ESD
parasitics
switch
Ron = 15 Ω
4 pF
4 pF
sampling
capacitor
sampling
capacitor
switch
Ron = 15 Ω
INM
8
7
internal
clock
internal
clock
INPUT
BUFFER


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