MAX7057ASE+T【PDF 15/20 页】IC TRANSMITTER ASK/FSK 16-SOIC

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The 4 MSBs of HIFREQ1 (fhi[15:12]) are the integer

portion of the divider, excluding offset of 16. The 12

LSBs (fhi[11:0]) are the fractional part of the divider.

300MHz to 450MHz Frequency-Programmable

ASK/FSK Transmitter

______________________________________________________________________________________ 15

DECIMAL

BINARY

CRYSTAL FREQUENCY DIVIDED BY

000

001

010

011

4-7

1XX

Table 6. ckdiv[2:0] of Configuration 0 Register (Address: 0x01)

BIT

NAME

FUNCTION

7-0

fhi[15:8]

8-bit upper byte of high-frequency divider for FSK

Table 7. High-Frequency 1 Register (Address: 0x02)

BIT

NAME

FUNCTION

7-0

fhi[7:0]

8-bit lower byte of high-frequency divider for FSK

Table 8. High-Frequency 0 Register (Address: 0x03)

BIT

NAME

FUNCTION

7-0

flo[15:8]

8-bit upper byte of low-frequency divider for FSK/ASK

Table 9. Low-Frequency 1 Register (Address: 0x04)

BIT

NAME

FUNCTION

7-0

flo[7:0]

8-bit lower byte of low-frequency divider for FSK/ASK

Table 10. Low-Frequency 0 Register (Address: 0x05)

DECIMAL VALUE

fhi[15:12], flo[15:12]

fhi[11:0], flo[11:0]

12.0220

0xC

0x05A

2.9536

0x2

0xF42

Table 11. Maximum and Minimum Values for Frequency Divide

The 4 MSBs of LOFREQ1 (flo[15:12]) are the integer

portion of the divider, excluding offset of 16. The 12

LSBs (flo[11:0]) are the fractional part of the divider.

Valid values for the divider are shown in Table 11.

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