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ADRF6702ACPZ-R7 数据表(PDF) 22 Page - Analog Devices |
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ADRF6702ACPZ-R7 数据表(HTML) 22 Page - Analog Devices |
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22 / 36 page ![]() ADRF6702 Data Sheet Rev. B | 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 MD9MD8MD7MD6MD5MD4MD3MD2MD1MD0 0 0000 000 001 0 0000 000 010 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1 1000 000 000 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 1 1111 111 111 MODULUS VALUE ... ... 2047 CONTROL BITS 1 1536 (DEFAULT) 2 ... ... RESERVED Figure 42. Register 1—Modulus Divide Control Register Map FD10 FD9FD8FD7FD6FD5FD4FD3FD2FD1FD0 0 0 00 000 000 0 0 0 00 000 000 1 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 0 1 10 000 000 0 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... 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 0 000 00 000 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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