Example: VCC = 3.3 V, V
參數(shù)資料
型號: ADN4605-EVALZ
廠商: Analog Devices Inc
文件頁數(shù): 48/56頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR ADN4605
標(biāo)準(zhǔn)包裝: 1
系列: *
其它名稱: Q6984339
ADN4605
Data Sheet
Rev. A | Page 52 of 56
Example: VCC = 3.3 V, VTTOx = 2.5 V
In a typical application, the user can select a default output level
of 200 mV single-ended (400 mVp-p differential) and may want
the option to choose preemphasis settings of 0 dB and 9.5 dB.
With preemphasis disabled, a dc-coupled transmitter causes a
100 mV common-mode shift across the termination resistors,
whereas an ac-coupled transmitter causes twice the common-
mode shift. When dc-coupled, the single-ended output voltage
swings between 2.5 V and 2.3 V and between 2.4 V and 2.2 V
when ac-coupled. In both cases, these levels are greater than the
minimum VL limit of 1.9 V (VL = VCC 1.4 V).
With a PE setting of 9.5 dB, the ac-coupled transmitter has
single-ended swings from 2.2 V and 1.6 V, whereas the dc-
coupled transmitter outputs swing between 2.5 V and 1.9 V.
The minimum single-ended output voltage (VL-PE) of the
ac-coupled transmitter case exceeds the minimum VL limit of
1.9 V by 300 mV, violating the device specification.
Enabling the TX_HDROOM and XPT_HDROOM bit lowers
the minimum VL limit by approximately 300 mV to 1.6 V. This
transmitter configuration now complies with the output voltage
range specification.
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