參數(shù)資料
型號： AD1849KP
廠商： ANALOG DEVICES INC
元件分類： 消費家電
英文描述： Serial-Port 16-Bit SoundPort Stereo Codec
中文描述： SPECIALTY CONSUMER CIRCUIT, PQCC44
封裝： PLASTIC, LCC-44
文件頁數(shù)： 23/28頁
文件大?。?/td> 293K
代理商： AD1849KP
AD1849K
REV. 0
–23–
No external circuitry is required for driving a single speaker
from the AD1849K ’s mono outputs as shown in Figure 16.
Note that this output is differential. Analog Devices guarantees
specified distortion performance for speaker impedances of 48
or greater. Lower impedance speakers can be used, but at the
cost of some distortion. When driving speakers much less than
48
, a power amp should be used. T he AD1849K can drive
speakers of 32
or greater.
MOUT
MOUTR
Z
≥
32
Figure 16. AD1849K External Mono Speaker Connector
Figure 17 illustrates reference bypassing. V
REF
should only be
connected to its bypass capacitors, which should be located as
close to Pin 21 as possible (especially the 0.1
μ
F capacitor).
10
μ
F
10
μ
F
CMOUT
0.1
μ
F
V
REF
Figure 17. AD1849K Voltage Reference Bypassing
Figure 18 illustrates signal-path filtering capacitors, C0 and C1.
T he AD1849K must use 1.0
μ
F capacitors.
C1
C0
1
μ
F
1
μ
F
Figure 18. AD1849K External Filter Capacitor Connections
T he crystals shown in the crystal connection circuitry of Figure 19
should be fundamental-mode and parallel-tuned. T wo sources for
the exact crystals specified are Component Marketing Services
in Massachusetts, U.S. at 617-762-4339 and Cardinal Compo-
nents in New Jersey, U.S. at 201-746-0333. Note that using the
exact data sheet frequencies is not required and that external
clock sources can be used to overdrive the AD1849K ’s internal
oscillators. (See the description of the MCK 1:0 control bits
above.) If using an external clock source, apply it to the crystal
input pins while leaving the crystal output pins unconnected.
Attention should be paid to providing low jitter external input
clocks.
COUT1
CIN1
20–64pF
24.576MHz
20–64pF
COUT2
CIN2
20–64pF
16.9344MHz
20–64pF
Figure 19. AD1849K Crystal Connections
Good, standard engineering practices should be applied for
power-supply decoupling. Decoupling capacitors should be
placed as close as possible to package pins. If a separate analog
power supply is not available, we recommend the circuit shown
in Figure 20 for using a single +5 V supply. Ferrite beads suffice
for the inductors shown. T his circuitry should be as close to the
supply pins as is practical.
+5V SUPPLY
1.6
1
μ
F
0.1
μ
F
V
DD
0.1
μ
F
FERRITE
0.1
μ
F
0.1
μ
F
0.1
μ
F
FERRITE
0.1
μ
F
1
μ
F
1
μ
F
V
DD
V
DD
V
CC
V
CC
Figure 20. AD1849K Recommended Power Supply
Bypassing
T he two PIO pins must be pulled HI, as they have open drain
outputs. Analog Devices also recommends pull-down resistors
for SCLK , FSYNC, SDT X , SDRX , and T SIN to provide
margin against system noise. CLK IN, CIN1, and CIN2, if not
used, should be grounded. A typical connection diagram is
shown in Figure 21, which serves to summarize the preceding
application circuits.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD1849KP-REEL 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 44-Pin PLCC T/R
AD1849KPZ 制造商:Analog Devices 功能描述:Audio Codec 2ADC / 2DAC 16-Bit 44-Pin PLCC
AD1849KST 制造商:未知廠家 制造商全稱:未知廠家 功能描述:A-Law/u-Law/Linear CODEC
AD-1850 制造商:SPC Multicomp 功能描述:ADAPTOR 18VDC 500MA 制造商:SPC Multicomp 功能描述:ADAPTOR, 18VDC, 500MA
AD-1850 制造商:UNBRANDED 功能描述:ADAPTOR 18VDC 500MA
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