參數(shù)資料
型號(hào)： AD1849KP
廠商： ANALOG DEVICES INC
元件分類(lèi)： 消費(fèi)家電
英文描述： Serial-Port 16-Bit SoundPort Stereo Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC44
封裝： PLASTIC, LCC-44
文件頁(yè)數(shù)： 24/28頁(yè)
文件大?。?/td> 293K
代理商： AD1849KP
AD1849K
REV. 0
–24–
5.1k
0.33
μ
F
5.1k
560pF
NPO
5.1k
0.33
μ
F
5.1k
560pF
NPO
PREFERRED
MICROPHONE
INPUT CIRCUIT
10
μ
F
10
μ
F
CMOUT
0.1
μ
F
V
REF
+5V
SUPPLY
1
μ
F
0.1
μ
F
V
DD
LINL
0.1
μ
F
FERRITE
0.1
μ
F
0.1
μ
F
0.1
μ
F
1
μ
F
V
DD
V
DD
V
CC
1.6
FERRITE
1
μ
F
V
CC
V
DD
LINR
MINL
MINR
C0
C1
GNDA
GNDA
PDN
PIO0
PIO1
0.1
μ
F
MOUT
MOUTR
MONO
SPEAKER
LOUT0L
LOUT0R
47k
47k
1
μ
F
1
μ
F
LINE
OUT 0
LINE OUT 1 OR
PREFERRED
HEADPHONE
CIRCUIT
LOUT1L
LOUT1R
LOUT1C
AD1849K
COUT1
CIN1
COUT2
CIN2
TSIN
RESET
FSYNC
SCLK
SDTX
SDRX
GNDD GNDD GNDD
20k
24.576MHz
20–64pF
16.9344MHz
UNUSED INPUTS SHOULD BE GROUNDED AND NC'S LEFT UNCONNECTED
47k
LINE IN
1
μ
F
1
μ
F
Figure 21. Typical Connection Diagram
Analog Devices recommends a split ground plane as shown in
Figure 22. T he analog plane and the digital plane are connected
directly under the AD1849K . Splitting the ground plane directly
under the SoundPort Codec is optimal because analog pins will
be located above the analog ground plane and digital pins will
be located directly above the digital ground plane for the best
isolation. T he digital ground and analog grounds should be tied
together in the vicinity of the AD1849K . Other schemes may
also yield satisfactory results.
Figure 23 illustrates the “zero-chip” interfaces of the AD1849K
SoundPort Codec to four of Analog Devices’ Fixed-Point
DS
μ
Ps. T he ADSP-2111, ADSP-2101 and ADSP-2115 use
their multichannel serial port for the data interface and flag
outputs for D/
C
. T he ADSP-2105 has a single serial port which
operates in its frameless mode. Because the ADSP-2105 lacks a
flag output, it alone does require additional circuitry to generate
D/
C
. Shown is an implementation using a single D-flop, an
OR-gate, and two pull-down resistors.
Low level ADSP-21xx software drivers for the AD1849K are
supplied with the AD1849K Evaluation Board. Source and
object codes arc available from your Analog Devices Sales
Representative or on the Analog Devices DSP Bulletin Board.
T he DSP Bulletin Board telephone number is (617) 461-4258,
8 data bits, no parity, 1 stop bit, 300 to 2400 baud.
Note that the interface to the T exas Instruments T MS320C25
must be significantly more complicated than these three
examples because the C25’s serial port cannot be a master,
which is required of the external controller during Control
Mode.
PDN
N/C
LOUT0R
C0
DIGITAL GROUND PLANE
ANALOG GROUND PLANE
AD1849K
Figure 22. AD1849K Recommended Ground Plane
SCLK0
RFS0
DT0
DR0
FL0
ADSP-2111
SCLK
FSYNC
TSIN
SDRX
SDTX
D/C
AD1849K
SCLK0
RFS0
DT0
DR0
FO
ADSP-2101
ADSP-2115
SCLK
FSYNC
TSIN
SDRX
SDTX
D/C
AD1849K
SCLK
RFS
TFS
DT
DR
D8
WR
DMS
ADSP-2105
SCLK
FSYNC
TSIN
SDRX
SDTX
D/C
AD1849K
RESET
RESET
CLR
D
Q
10k
10k
Figure 23. Interfaces to Analog Devices’ Fixed-Point
DS
μ
Ps
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