参数资料
型号: SC900841JVKR2
厂商: Freescale Semiconductor
文件页数: 143/192页
文件大小: 0K
描述: IC POWER MGT 338-MAPBGA
标准包装: 2,000
应用: PC,PDA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 338-TFBGA
供应商设备封装: 338-MAPBGA
包装: 带卷 (TR)
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FUNCTIONAL DEVICE OPERATION
AUDIO
transmitting to the digital bus interface, the volume of the
converted signal can be controlled with a fine gain setting
through LAMPVL[5:0].
Table 88. Transmit Amplifiers Performance Specifications
Parameter
Gain Accuracy
Condition
Minimum
-0.5
Typical
Maximum
+0.5
Units
dB
Amplifier Bias Current
Crosstalk Between Inputs
200
-60
μ A
dB
PSRR
THD
Input Noise
Relative to BP, 217 Hz
MC1IN, 1.02 kHz, 10 mVrms
Referred to REFA
90
-60
1.5
dB
dB
μ Vrmsp
Digital microphones can be connected to the MC1IN and
MC2IN inputs. The digital microphone is supplied from the
microphone bias and clocked through the microphone
clocking output, MCCLK. The resulting Pulse Density
Modulated signal from the digital microphone is directly
routed to the filter section of the ADC.
If a single digital microphone is used in the application, it
should be connected to MC2IN, and PCM1 voice mode
should be used in order to get the same data in the left and
right channels. If PCM2 stereo mode is used, the digital
microphone on the MC2IN signal is sent on the right channel
of PCM1 data only. Voice mode is not supported for the
digital microphone connected to the MC1IN pin.
If two digital microphones (dual dmics) are used in the
application, PCM2 stereo mode must be used. In dual digital
microphone mode, DMIC1 (MC1IN) data and DMIC2
(MC2IN) data is sent to the left and right channels of PCM2,
respectively.
The MCCLK signal is enabled by setting the DMICCLKEN
bit, and its frequency is selectable between 1.0 MHz and
Table 89. Transmit Gain Control
2.0 MHz by setting the DMICCLK[0] bit. The exact clock
frequency will vary as a function of the ADC sample rate. The
MC2IN input is configured for digital microphone use by
setting the MUXIN bit. Both the clock and the data stream are
referenced with respect to MC2B. The gain of the digital
microphone data to the digital serial interface can be
controlled with the DMICVOL[5:0] bits. The signal from the
digital microphone can be routed into the receive voice DAC
path as a side tone, by clearing the DMICMUTFB bit, and its
gain can be controlled with the DMICVLFB[5:0] bits. The
digital mic data to the digital serial interface can be muted
with the DMICMUT bit and the digital mic data to the voice
DAC can be muted with the DMICMUTEFB bit.
The data routed to the PCM1 digital serial interface is
selectable between the digital mic, and the right channel ADC
by the PCM1RCH bit. Similarly, the data routed to the PCM2
digital serial interface is selectable between the digital mic
and the left channel ADC, by the PCM2LCH bit, and is
selectable between the digital mic and the right channel ADC
by the PCM2RCH bit
Gain and Volume Setting for Bits
RAMPVL[5:0], LAMPVL[5:0]
000000
000001
111001 (default)
Gain and Volume
Setting
DMICVOL[5:0]
111111
111110
000110
Gain
-57
-56
0
Units
dB
dB
dB
Gain and Volume Setting for Bits
MIC1PRE[1:0], MIC2PRE[1:0] *
00
01
10
11
Gain
Mic / RXin
0/0
12 / 8
20 / 18
28 / 26
Units
dB
dB
dB
dB
111110
111111
000001
000000
+5
+6
dB
dB
* These gain settings are obtained by a combination of the
0/+12 dB, 0/+8/+18 dB and -8/0/+8/+16 dB. The 0 dB to
+7.0 dB settings in the ADC are not used
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
143
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