參數(shù)資料
型號： AD1843JST
廠商： ANALOG DEVICES INC
元件分類： 消費家電
英文描述： Serial-Port 16-Bit SoundComm Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁數(shù)： 44/64頁
文件大小： 848K
代理商： AD1843JST
REV. 0
–44–
AD1843
When in Video Lock Mode (C3REF and C3VID are both set to “1”):
Bits C3M7:0 select the Conversion clock rate. The most significant bit (C3M7) must be set to indicate the type of
video lock, either NTSC or PAL. For an NTSC lock, C3M7 must be reset to “0,” and the SYNC3 pin must
receive the NTSC sync frequency (525 lines/frame
×
30 Hz
×
1000/1001 frame rate
≈
15.734 kHz). For a PAL lock,
C3M7 must be set to “1,” and the SYNC3 pin must receive the PAL sync frequency (625 lines/frame
×
25 Hz frame
rate
≈
15.625 kHz). The next three most significant bits (C3M6:4) select a desired
base
Conversion clock rate, and
the least significant four bits (C3M3:0) select a
divisor
. The Conversion clock created by Clock Generator 3 will be
the
base
divided by the
divisor
. The following tables list the possible choices for base and divisor.
(C3M7 = “0”):
Base Frequency In Hz (C3M6:4)
48,000
32,000
44,100
(C3M3:0)
(000)
(001)
(010)
(0000)
Yes
Yes
Yes
(0001)
Yes
Yes
Yes
(0010)
Yes
No
Yes
(0011)
Yes
Yes
Yes
(0100)
Yes
Yes
Yes
(0101)
Yes
No
Yes
(0110)
No
No
Yes
(0111)
Yes
No
Yes
NTSC
44,100
×
2/3
(011)
Yes
Yes
No
Yes
Yes
No
No
No
48,000*
(100)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
44,056
(101)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Divisor
1
2
3
4
5
6
7
8
*When C3M6:4 = “100,” base frequency is 48,000 Hz only if NTSC sync rate is increased by 1001/1000, or is exactly 15.570 kHz.
PAL
(C3M7 = “1”):
Base Frequency In Hz (C3M6:4)
48,000
32,000
Divisor
(C3M3:0)
(000)
(001)
1
(0000)
Yes
Yes
2
(0001)
Yes
Yes
3
(0010)
Yes
No
4
(0011)
Yes
Yes
5
(0100)
Yes
Yes
6
(0101)
Yes
No
7
(0110)
Yes
No
8
(0111)
Yes
No
Initial default state after reset: 0000 0000 1111 1111 (00FF hex). Cleared to default and cannot be written to when:
the
RESET
pin is asserted LO; or when the
PWRDWN
pin is asserted LO.
44,100
(010)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
44,100
×
2/3
(011)
Yes
Yes
No
Yes
Yes
No
No
No
Address 23
Clock Generator 3 Control—Sample Rate
Data 15
Data 14
Data 13
Data 12
Data 11
Data 10
Data 9
Data 8
C3C15
C3C14
C3C13
C3C12
C3C11
C3C10
C3C9
C3C8
Data 7
Data 6
Data 5
Data 4
Data 3
Data 2
Data 1
Data 0
C3C7
C3C6
C3C5
C3C4
C3C3
C3C2
C3C1
C3C0
C3C15:0
Clock Generator 3 Conversion (Sample) Rate Select. Defines the conversion rate produced by Clock Generator 3
when not referenced to the SYNC3 pin (Control Register Address 22 Bit 15 [C3REF]). One LSB represents exactly
one Hertz, assuming a 24.576MHz clock input on the XTALI pin. Usable range is 4 kHz (0x0FA0) to 54 kHz
(0xD2F0).
Initial default state after reset: 1011 1011 1000 0000 (BB80 hex), which is 48kHz, assuming a 24.576 MHz clock in-
put on the XTALI pin. Cleared to default and cannot be written to when: the
RESET
pin is asserted LO; or when
the
PWRDWN
pin is asserted LO.
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