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ADS5545 Datasheet(PDF) 40 Page - Texas Instruments

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Part No. ADS5545
Description  11-BIT, 200 MSPS ADC
Download  54 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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ADS5545 Datasheet(HTML) 40 Page - Texas Instruments

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CLKOUTP
LOW_D0_P,
LOW_D0_M
D1_D2_P,
D1_D2_M
D3_D4_P,
D3_D4_M
D5_D6_P,
D5_D6_M
D7_D8_P,
D7_D8_M
D9_D10_P,
D9_D10_M
LOW
D1
D3
D5
D7
D9
SampleN+1
SampleN
LOW
D1
D3
D5
D7
D9
D0
D2
D4
D6
D8
D10
D0
D2
D4
D6
D8
D10
CLKOUTM
LVDS Buffer Current Programmability
LVDS Buffer Internal Termination
ADS5517
SLWS203 – DECEMBER 2007
Figure 43. DDR LVDS Interface
The default LVDS buffer output current is 3.5 mA. When terminated by 100
Ω, the results is a 350-mV
single-ended voltage swing (700-mVPP differential swing). The LVDS buffer currents can also be programmed to
2.5 mA, 4.5 mA, and 1.75 mA using the register bits <LVDS CURR> (Table 17). In addition, there exists a
current double mode, where this current is doubled for the data and output clock buffers (register bits <CURR
DOUBLE>, Table 18).
An internal termination option is available (using the serial interface), by which the LVDS buffers are differentially
terminated inside the device. The termination resistences available are – 325, 200, and 170
Ω (nominal with
±20% variation). Any combination of these three terminations can be programmed; the effective termination is
the parallel combination of the selected resistences. This results in eight effective terminations from open (no
termination) to 75
Ω.
The internal termination helps to absorb any reflections coming from the receiver end, improving the signal
integrity. With 100-
Ω internal and 100-Ω external termination, the voltage swing at the receiver end is halved
(compared to no internal termination). The voltage swing can be restored by using the LVDS current double
mode. Figure 44 shows the eye diagram of one of the LVDS data outputs with a 10-pF load capacitance (from
each pin to ground) and 100-
Ω internal termination enabled. The termination can be programmed using register
bits <DATA TERM> and <CLKOUT TERM> (Table 17).
40
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Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): ADS5517


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