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參數(shù)資料
| 型號： | PGA4311UG4 |
| 英文描述： | 4-Channel Audio Volume Control |
| 中文描述： | 4通道音頻音量控制 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大?。?/td> | 579K |
| 代理商： | PGA4311UG4 |
SBOS230A
–
MARCH 2002
–
REVISED JUNE 2002
www.ti.com
6
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25
°
C, VA+ = +5V, VA
–
=
–
5V, VD+ = +5V, RL = 100k
, CL = 20pF, BW measure = 10Hz to 20kHz, unless otherwise noted.
(NOTE: All plots taken with PGA4311 A
–
Grade.)
GENERAL DESCRIPTION
The PGA4311 is a four-channel audio volume control.
It may be used in a wide array of professional and
consumer audio equipment. The PGA4311 is fabricated
in a sub-micron CMOS process.
The heart of the PGA4311 is a resistor network, an analog
switch array, and a high-performance op amp stage. The
switches are used to select taps in the resistor network
that, in turn, determine the gain of the amplifier stage.
Switch selections are programmed using a serial control
port. The serial port allows connection to a wide variety of
host controllers. See Figure 1 for a functional block
diagram of the PGA4311.
POWER
–
UP STATE
On power up,
“
power-up reset
”
is activated for about
100ms during which the circuit is in hardware MUTE state
and all internal flip-flops are reset. At the end of this period,
the offset calibration is initiated without any external signals.
Once this has been completed, the gain byte value for all
channels are set to 00
HEX
, or the software MUTE condi-
tion. The gain will remain at this setting until the host con-
troller programs new settings for for each channel via the
serial control port.
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