PGA2310_06 Datasheet, PDF (9/16 Pages) Burr-Brown (TI) – Stereo Audio Volume Control

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GAIN SETTINGS
The gain for each channel is set by its corresponding 8-bit
code, either R[7:0] or L[7:0], see Figure 2. The gain code
data is straight binary format. If we let N equal the decimal
equivalent of R[7:0] or L[7:0], then the following
relationships exist for the gain settings:
For N = 0:
Mute Condition. The input multiplexer is connected to
analog ground (AGNDR or AGNDL).
PGA2310
SBOS207B − OCTOBER 2001 − REVISED JUNE 2004
For N = 1 to 255:
Gain (dB) = 31.5 − [0.5 • (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 later in this data
sheet.
CS
SCLK
SDI
SDO
t_CSCR
t_SDS
t_SDH
MSB
t_CFCS
t_CSO
t_CFDO
t_CSZ
Figure 3. Serial Interface Timing Requirements
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