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AD9974BBCZ Datasheet(PDF) 46 Page - Analog Devices |
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AD9974BBCZ Datasheet(HTML) 46 Page - Analog Devices |
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46 / 52 page  AD9974 Rev. A | Page 46 of 52 Address Data Bit Content Default Value Update Name Description [10:8] 1 H3DRV H3 Drive Strength. [11] Unused Set unused bits to 0. [14:12] 1 H4DRV H4 Drive Strength. [15] Unused Set unused bits to 0. [18:16] TESTMODE Test Operation Only. Set to 0. [19] Unused Set unused bits to 0. [22:20] 1 RGDRV RG Drive Strength. [27:23] 0 Unused Set unused bits to 0. 0x36 [5:0] 0 SCK SHDLOC SHD Sampling Edge Location. [11:6] 20 SHPLOC SHP Sampling Edge Location. [17:12] 10 SHPWIDTH SHP Width. Controls input dc restore switch active time. [27:18] Unused Set unused bits to 0. 0x37 [5:0] 0 SCK DOUTPHASEP DOUT Positive Edge Phase Control. [11:6] 20 DOUTPHASEN DOUT Negative Edge Phase Control. Set DOUTPHASEN = DOUTPHASEP + 0x20. [12] 0 DCLKMODE 0 = DCLK tracks DOUT phase. 1 = DCLK is CLI post-Schmitt trigger and post-divider when CLIDIVIDE = 1. [14:13] 2 CLKDATA_SEL Data Output Clock Selection. 0 = no delay. 1 = ~4 ns. 2 = ~8 ns. 3 = ~12 ns. [15] 0 INV_DCLK 0 = no invert. 1 = invert DCLK to output. [27:16] Unused Set unused bits to 0. 0x38 [27:0] Unused Set unused register to 0 if this register is accessed. 0x39 [27:0] Unused Set unused register to 0 if this register is accessed. 0x3A [27:0] Unused Set unused register to 0 if this register is accessed. 0x3B [27:0] Unused Set unused register to 0 if this register is accessed. 0x3C [27:0] Unused Set unused register to 0 if this register is accessed. 0x3D [27:0] Unused Set unused register to 0 if this register is accessed. Table 28. Test Registers—Do Not Access Address Data Bit Content Default Value Update Name Description 0x3E [18:0] 4B020 SCK TESTMODE Test Operation Only. Set to 4B020. [27:19] Unused Set unused bits to 0. 0x3F [27:0] SCK Unused Set unused register to 0 if these registers are accessed. 0x40 [3:0] F SCK TESTMODE Test Operation Only. Set to F if accessed. [9:4] 0 TESTMODE Test Operation Only. Set to 0. [27:10] Unused Set unused bits to 0. 0x41 to 0x4F [27:0] SCK Unused Set unused register to 0 if these registers are accessed. 0x50 to 0x5F [27:0] SCK Unused Set unused register to 0 if these registers are accessed. |
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