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參數(shù)資料
| 型號： | P95020NQG8 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
| 封裝： | 10 X 10 MM, 0.85 MM HEIGHT, QFN-132 |
| 文件頁數(shù)： | 84/169頁 |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG8 |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
21
2011 Integrated Device Technology, Inc.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Power Supply Rejection Ratio (1 kHz)
70
dB
Crosstalk between Input channels
85
dB
DAC Volume/Gain Step Size
0.75
dB
ADC/Mixer Volume/Gain Step Size
1.5
dB
Analog Mic Boost Step Size
10
dB
Input Impedance
50
k
Ω
Differential Input Impedance
20
k
Ω
Input Capacitance
15
pF
Mic Bias
2.97
V
External Load Impedance
6
k
Ω
Audio – Microphone Input Port
The microphone input port supports either analog or digital
microphones. The analog and digital modes share pins so
only one mode is supported in a typical application.
Analog Microphone Input Mode
The Analog Microphone input path consists of:
- Stereo Differential Input Analog Microphone
Buffer
- L/R swap
- Mono or stereo
- Microphone Bias Generator with
2 independent bias outputs.
- Microphone Boost Amplifier with
selectable gain of 10, 20, or 30dB
The analog microphone interface provides a stereo
differential input for supporting common electret cartridge
microphones in a balanced configuration (a single-ended
configuration is also supported).
A boost amplifier
provides up to 30dB of gain to align typical microphone full
scale outputs to the ADC input range. The microphone
input is then routed to both ADC1 and the analog mixer for
further processing. By using the analog mixer the analog
microphone input may be routed to ADC0, the line output
port or the headphone output port.
Digital Microphone Input Mode
The Digital Microphone input path consists of an input
buffer and MUX with the following features:
- One or two microphones per DMICDATx input.
- Mono data sampled during high or low clock level.
- L/R swap
- Versatile DMICSEL output pin for control of digital
microphone modules or other external circuitry.
(Used primarily to enable/disable microphones that do
not support power management using the clock pin.)
The digital microphone interface permits connection of a
digital microphone(s) via the DMICDAT1, DMICDAT2, and
DMICCLK 3-pin interface.
The DMICDAT1 and
DMICDAT2 signals are inputs that carry individual
channels of digital microphone data to the ADC. In the
event that a single microphone is used, the data is ported
to both ADC channels. This mode is selected using a
register setting and the left time slot is copied to the ADC
left and right inputs. The digital microphone input is only
available at ADC1.
The DMICCLK output is controllable from 4.704 MHz,
3.528 MHz, 2.352 MHz, 1.176 MHz and is synchronous to
the internal master clock (MCLK). The default frequency
is 2.352 MHz.
To conserve power, the analog portion of the ADC and the
analog boost amplifier will be turned off if the D-mic input
is selected. When switching from the digital microphone
to an analog input to the ADC, the analog portion of the
ADC will be brought back to a full power state and allowed
to stabilize before switching from the digital microphone to
the analog input in less than 10ms.
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