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ADC32RF42 Datasheet(PDF) 23 Page - Texas Instruments

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Part # ADC32RF42
Description  Dual-Channel, 14-Bit, 1.5-GSPS, Analog-to-Digital Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADC32RF42 Datasheet(HTML) 23 Page - Texas Instruments

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V
CM
50
50
CLKINP
100
SYSREFP
SYSREF
Capture
Delay
CLKINM
SYSREFM
Clock Amplitude (vPP)
0.2
1
2
50
100
150
200
250
300
350
D061
fIN = 1 GHz
fIN = 2 GHz
23
ADC32RF42
www.ti.com
SBAS844 – MAY 2017
Product Folder Links: ADC32RF42
Submit Documentation Feedback
Copyright © 2017, Texas Instruments Incorporated
Feature Description (continued)
The analog-to-digital converter (ADC) aperture jitter is a function of the clock amplitude applied to the pins.
Figure 41 shows the equivalent aperture jitter for input frequencies at a 1-GHz and a 2-GHz input (fS =
1.5 GSPS). Depending on the clock frequency, a matching circuit can be designed in order to maximize the clock
amplitude.
Figure 41. Equivalent Aperture Jitter vs Input Clock Amplitude
9.3.3 SYSREF Input
The SYSREF signal is a periodic signal that is sampled by the ADC32RF42 device clock and is used to align the
boundary of the local multiframe clock inside the data converter. SYSREF is also used to reset critical blocks
[such as the clock divider for the interleaved ADCs, numerically-controlled oscillators (NCOs), decimation filters
and so forth].
The SYSREF input requires external biasing. Furthermore, SYSREF must be established before the SPI
registers are programmed. A programmable delay on the SYSREF input, as shown in Figure 42, is available to
help with skew adjustment when the sampling clock and SYSREF are not provided from the same source.
Figure 42. SYSREF Internal Circuit Diagram


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