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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)： | 22/28頁 |
| 文件大小： | 293K |
| 代理商： | AD1849KP |
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AD1849K
REV. 0
–22–
A circuit for 2 V rms line-level inputs is shown in Figure 11.
Note that this is approximately a divide-by-two resistive divider.
5.1k
5.1k
560pF
LINL
0.33
μ
F
NPO
5.1k
5.1k
560pF
LINR
0.33
μ
F
NPO
Figure 11. AD1849K 2 V rms Line-Level Input Circuit
An external passive antialias filter is required. If line-level inputs
are already at the 1 V rms levels expected by the AD1849K , the
resistors in parallel with the 560 pF capacitors should be
omitted and the series 5.1 k
resistor should be decreased to
2.5 k
.
T he AD1849K Codec contains a bypassable +20 dB gain block
to accommodate condenser microphones. Particular system
requirements will depend upon the characteristics of the
intended microphone. Figure 12 illustrates one example of how
connected to the AD1849K . CMOUT is shown buffered by an
op amp; a transistor like a 2N4124 will also work fine for this
purpose. Note that if a battery-powered microphone is used, the
buffer and R2s are not needed. T he values of R1, R2, and C
should be chosen in light of the mic characteristics and intended
gain. T ypical values for these might be R1 = 20 k
, R2 = 2 k
,
and C = 220 pF.
5k
1
μ
F
1/2 SSM-2135
OR AD820
MINL
CMOUT
LEFT ELECTRET
CONDENSER
MICROPHONE
INPUT
5k
C
1
μ
F
MINR
RIGHT ELECTRET
CONDENSER
MICROPHONE
INPUT
1/2 SSM-2135
OR AD820
R
1
C
CMOUT
R
1
R
2
R
2
1/2 SSM-2135
OR AD820
0.33
μ
F
0.33
μ
F
Figure 12. AD1849K “ Phantom-Powered” Microphone
Input Circuit
Figure 13 shows ac-coupled line outputs. T he resistors are used
to center the output signals around analog ground. If dc-
coupling is desired, CMOUT could be used with op amps as
mentioned below.
1
μ
F
47k
LOUT0L
1
μ
F
47k
LOUT0R
Figure 13. AD1849K Line Output Connections
A circuit for headphone drive is illustrated in Figure 14. Drive is
supplied by +5 V operational amps. T he circuit shown ac
couples the headphones to the line output.
HEADPHONE
LEFT
HEADPHONE
RIGHT
LOUT1L
LOUT1R
470
μ
F
10k
SSM-2135
8.66k
8.66k
470
μ
F
10k
LOUT1C
Figure 14. AD1849K Headphone Drive Connections
T he AD1849K has a common return path LOUT 1C which is
biased up to the CMOUT voltage, nominally 2.25 V. T he
AD1849K allows for 6 dB larger output voltage swings by
resetting the OLB bit (Bit 59 of the Control Word) to “0.”
Figure 15 illustrates an alternative headphone connection for
the AD1849K which uses the LOUT 1C pin to eliminate the
need for ac coupling. T he 12
resistors minimize output level
variations caused by different headphone impedances.
LOUT 1L, LOUT 1R and LOUT 1C are short-circuit protected.
Note that driving headphones directly as shown in Figure 15
with OLB = 0 will cause clipping for large input signals and will
only work with very efficient “Walkman-type” headphones. For
high quality headphone listening, Analog Devices recommends
the circuit shown in Figure 14 with OLB = 1.
LOUT1L
LOUT1R
LOUT1C
12
1/2W
HEADPHONE
LEFT
HEADPHONE
RIGHT
HEADPHONE
RETURN
12
1/2W
Figure 15. AD1849K Optional Headphone Drive
Connections
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| AD-1850 | 制造商:UNBRANDED 功能描述:ADAPTOR 18VDC 500MA |
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