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ADRF6701ACPZ-R7 데이터시트(PDF) 22 Page - Analog Devices |
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ADRF6701ACPZ-R7 데이터시트(HTML) 22 Page - Analog Devices |
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22 / 36 page ![]() ADRF6701 Data Sheet Rev. 0 | Page 22 of 36 REGISTER 1—MODULUS DIVIDE CONTROL (DEFAULT: 0x003001) With Register 1, Bits[2:0] set to 001, the on-chip modulus divide control register is programmed as shown in Figure 42. Modulus Value The modulus value is the preset fractional modulus ranging from 1 to 2047. REGISTER 2—FRACTIONAL DIVIDE CONTROL (DEFAULT: 0x001802) With Register 2, Bits[2:0] set to 010, the on-chip fractional divide control register is programmed as shown in Figure 43. Fractional Value The FRAC value is the preset fractional modulus ranging from 0 to <MDR. MODULUS VALUE DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 0 0 0 0 0 0 0 0 0 0 MD10 MD9 MD8 MD7 MD6 MD5 MD4 MD3 MD2 MD1 MD0 C3(0) C2(0) C1(1) MD10 MD9MD8MD7MD6 MD5MD4MD3MD2 MD1MD0 0 0 0000 0000 1 0 0 0000 0001 0 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1 1 0000 0000 0 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1 1 1111 1111 1 MODULUS VALUE ... ... 2047 CONTROL BITS 1 1536 (DEFAULT) 2 ... ... RESERVED Figure 42. Register 1—Modulus Divide Control Register Map FD10 FD9 FD8 FD7 FD6 FD5 FD4 FD3 FD2 FD1 FD0 0 0 000 000 000 0 0 000 000 001 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0 1 100 000 000 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... FRACTIONAL VALUE MUST BE LESS THAN MODULUS. FRACTIONAL VALUE 0 1 ... ... 768 (DEFAULT) ... ... <MDR FRACTIONAL VALUE RESERVED DB23 DB22 DB21 DB20 DB19 DB18 DB17 DB16 DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 CONTROL BITS 0 0 0 0 0 0 0 0 0 0 FD10 FD9 FD8 FD7 FD6 FD5 FD4 FD3 FD2 FD1 FD0 C3(0) C2(1) C1(0) Figure 43. Register 2—Fractional Divide Control Register Map |
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