PGA4311K Burr-Brown Corporation, PGA4311K Datasheet - Page 9

• Manufacturer Part Number: PGA4311K
• Description: 4 CHANNEL AUDIO VOLUME CONTROL
• Manufacturer: Burr-Brown Corporation

Figure 3. Serial Interface Timing Requirements.
GAIN SETTINGS
The gain for each channel is set by its corresponding
8-bit code, [7:0] (see Figure 2). The gain code data is
straight binary format. If we let N equal the decimal
equivalent of [7:0], then the following relationships ex-
ist for the gain settings:
For N = 0:
Mute Condition. The input multiplexer is connected to
analog ground.
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For N = 1 to 255:
Gain (dB) = 31.5 – [0.5 w (255 – N)]
This results in a gain range of +31.5dB (with N = 255)
to –95.5dB (with N = 1).
Changes in gain setting may be made with or without
zero crossing detection. The operation of the zero
crossing detector and timeout circuitry is discussed lat-
er in this data sheet.
SBOS230A – MARCH 2002 – REVISED JUNE 2002
PGA4311
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