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ADN4604ASVZ Datasheet(PDF) 21 Page - Analog Devices |
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ADN4604ASVZ Datasheet(HTML) 21 Page - Analog Devices |
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21 / 40 page  Data Sheet ADN4604 Rev. A | Page 21 of 40 Advanced Settings In addition to the basic settings provided in the TX basic control registers, advanced settings are available in TX Drive 0 Control and TX Drive 1 Control registers (Address 0x30 to Address 0x4F). The advanced settings are useful in applications where each output requires an individually programmed preemphasis or output level setting beyond what is available in the lookup table in basic mode. To enable these advanced settings, set the TX CTL SELECT bit in the TX basic control register to a logic high. Next, program the TX Drive 0 control and Drive 1 control registers (Address 0x30 to Address 0x4F) to the desired output level and boost values. A subset of possible settings is provided in Table 13. An expanded list of available settings is shown in Table 19 in the Applications Information section. These advanced settings can also be used to modify the TX lookup table settings (Address 0x60 to Address 0x6F). The advanced settings register map is shown in Table 15. The preemphasis boost equation follows. ) 1 ( log 20 ] dB [ 10 V V V DC SW DC SW PE SW Gain (1) VTTO VH-PE VSW-PE VL-PE VL-DC VSW-DC VH-DC VOCM TPE Figure 44. Signal Level Definitions Table 13. TX Preemphasis and Output Swing Advanced Settings Single-Ended Output Levels and PE Boost Register Settings Output Current VSW-DC1 (mV) VSW-PE1 (mV) PE Boost % PE (dB) TX Drive 0 TX Drive 1 ITTO1 (mA) 200 200 0.00 0.00 0xBB 0x00 8 200 300 50.00 3.52 0xBB 0x99 12 200 350 75.00 4.86 0xBB 0xAA 14 200 400 100.00 6.02 0xBB 0xBB 16 200 450 125.00 7.04 0xBB 0xCC 18 200 500 150.00 7.96 0xBB 0xDD 20 200 600 200.00 9.54 0xBB 0xFF 24 300 300 0.00 0.00 0xDD 0x00 12 300 400 33.33 2.50 0xDD 0x99 16 300 450 50.00 3.52 0xDD 0xAA 18 300 500 66.67 4.44 0xDD 0xBB 20 300 550 83.33 5.26 0xDD 0xCC 22 300 600 100.00 6.02 0xDD 0xDD 24 300 700 133.33 7.36 0xDD 0xFF 28 400 400 0.00 0.00 0xFF 0x00 16 400 500 25.00 1.94 0xFF 0x99 20 400 550 37.50 2.77 0xFF 0xAA 22 400 600 50.00 3.52 0xFF 0xBB 24 400 650 62.50 4.22 0xFF 0xCC 26 400 700 75.00 4.86 0xFF 0xDD 28 400 800 100.00 6.02 0xFF 0xFF 32 500 500 0.00 0.00 0xFF 0x0B 20 600 600 0.00 0.00 0xFF 0x0F 24 1 Symbol definitions are shown in Table 14. Table 14. Symbol Definitions Symbol Formula Definition IDC Programmable Output current that sets output level IPE Programmable Output current for PE delayed tap ITTO IDC + IPE Total transmitter output current TPE Preemphasis pulse width VDPP-DC 25 Ω × IDC × 2 Peak-to-peak differential voltage swing of non- preemphasized waveform VDPP-PE 25 Ω × ITTO × 2 Peak-to-peak differential voltage swing of preemphasized waveform VSW-DC VDPP-DC/2 = VH-DC – VL-DC DC single-ended voltage swing VSW-PE VDPP-PE/2 = VH-PE – VL-PE Preemphasized single-ended voltage swing ∆VOCM_DC-COUPLED 25 Ω × ITTO/2 Output common-mode shift, dc-coupled outputs ∆VOCM_AC-COUPLED 50 Ω × ITTO/2 Output common-mode shift, ac-coupled outputs VOCM VTTO − ∆VOCM = ( VH-DC + VL-DC )/2 Output common-mode voltage VH-DC VTTO − ∆VOCM + VDPP-DC/2 DC single-ended output high voltage VL-DC VTTO − ∆VOCM − VDPP-DC/2 DC single-ended output low voltage VH-PE VTTO − ∆VOCM + VDPP-PE/2 Maximum single-ended output voltage VL-PE VTTO − ∆VOCM − VDPP-PE/2 Minimum single-ended output voltage VTTO Output termination voltage |
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