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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 91/169頁(yè) |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG8 |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
28
2011 Integrated Device Technology, Inc.
Audio – Reference Voltage Generator,
Buffer, and Filtering Caps
AVREF
The AVREF pin is part of the internal virtual ground
reference generator. A capacitor placed between AVREF
and AGND is necessary for acceptable power supply
rejection and anti-pop performance. A capacitor of 10
μF
is recommended to provide about a 10 second ramp-up
time.
ADCREF
The ADC reference also requires a capacitor of at least 1
F for proper operation.
AFILT
ADC1 augments its internal filter capacitors with external
filter capacitors to reduce noise outside of the audio band
before sampling. 1000 pF capacitors connected from the
AFILT1 and AFILT2 pins to AGND are recommended but
larger capacitors may be used if reduced signal bandwidth
is acceptable. Process variation will cause bandwidth to
vary from part to part. A 1000 pF capacitor will place the
filter pole far outside of the 20 kHz bandwidth supported
so that the ±1 dB 20 kHz bandwidth limit is guaranteed.
Audio – Analog and Class D Output
Block
The Audio subsection provides support for line level,
headphone and speaker outputs.
The analog line output port features a source MUX and
single ended output buffer designed to drive high
impedance loads. This port has selectable 0/3/6 db gain
for -6 dBV, -3 dBV or 0 dBV DAC output levels
respectively. The Cap-less Stereo Headphone Output
port is similar to the line level output port but can drive 32
ohm headphones and may operate without DC blocking
capacitors by connecting the physical headphone’s
ground return to the VIRT_GND pin.
A CLASS_D Mono BTL Output and Class D Stereo
Processor w/ digital volume control (See CLASS_D
section for more information) provides up to 2.5 W of
output power into a 4 ohm speaker.
The line output port, headphone port and CLASS_D BTL
Power Output can select from the mixer, DAC0, DAC1 or
the line input (LINE_IN). The line input selection is
intended for very low power LINE_IN to LINE_OUT pass-
thru when VDD_AUDIO33 and VDD_AUDIO18 power on,
and configure LINE_OUT_SCTRL (Setting 2h, see Table
81) to select LINE_OUT from LINE_IN.
Audio – Class D BTL Amplifier
The IDTP95020 implements a digital Class-D 2.5W (4
Ω)
BTL amplifier which supports both 8
Ω and 4 Ω loads.
Gain for the BTL amplifier is programmable from -91 dB to
+36 dB in 0.5 dB steps using the Volume 0/1 registers.
Gain changes and mute may be applied immediately, on
zero crossing or ramped from the current to target value
slowly. These settings are controlled using the Gain
Control HI/LO registers.
EQ
There are 5 bands of parametric EQ (bi-quad) per channel.
Due to the flexibility of the bi-quad implementation, each
filter band may be configured as a high-pass, low-pass,
band-pass, high shelving, low shelving or other function.
Each band has an independent set of coefficients. A bi-
quad filter has 6 coefficients.
One coefficient is
normalized to 1 and 5 are programmed into the core.
Each band supports up to +15 dB boost or up to -36 dB
cut.
Coefficients
The following equations describe each filter band. The
fundamental equation is a bi-quadratic of the form:
2
1
2
1
z
2
a
z
1
a
0
a
z
2
b
z
1
b
0
b
)
z
(
H
+
=
(1)
Rearranging slightly we can see that normalizing a0 or b0
can reduce the number of stored coefficients.
()
( )
()
2
1
2
1
z
0
a
2
a
z
0
a
1
a
1
z
0
b
2
b
z
0
b
1
b
1
0
a
0
b
)
z
(
H
+
×
=
(2)
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| P95020ZNQGI8 | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
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| P95020ZNQG | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
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