Specifications

ESS Technology, Inc. SAM0023-122898 55
ES1869 DATA SHEET
PROGRAMMING THE ES1869
Record and Playback Mixer
The ES1869 has stereo mixers for playback and record.
Each stereo mixer has eight input sources, each with
independent 4-bit left and right volume controls. For each
4-bit volume control, level 0 is mute and level 15 is
maximum volume. The ES1869 mixers use a dual slope
method for selecting volume. Each increase of one step in
volume from settings 1 to 8 results in a +3 dB increase.
Each increase of one step in volume from settings 8 to 15
results in a +1.5 dB increase.
Table 21 Extended Access Mixer Volume Values
4-Bit
Value
Volume in Decibels (dB)
Audio 1
a
(Record)
a. Audio 1 DAC mixer input is gated by the Sound Blaster
“Speaker On” control. This control bit is toggled by the D1
(on) and D3 (off) Sound Blaster commands.
Audio 2
b
(Playback)
b. In Telegaming mode (enabled by bit 0 of mixer register 48h
when in Serial mode), the audio 2 DAC mixer input volume
is slaved to the audio 1 DAC mixer input volume.
Mic,
Music DAC,
I
2
S
AuxA,
AuxB,
Line,
Mono-In
15 +1.5 0 +10.5 +3.0
14 0 -1.5 +9.0 +1.5
13 -1.5 -3.0 +7.5 0
12 -3.0 -4.5 +6.0 -1.5
11 -4.5 -6.0 +4.5 -3.0
10 -6.0 -7.5 +3.0 -4.5
9 -7.5 -9.0 +1.5 -6.0
8 -9.0 -10.5 0 -7.5
7 -12.0 -13.5 -3.0 -10.5
6 -15.0 -16.5 -6.0 -13.5
5 -18.0 -19.5 -9.0 -16.5
4 -21.0 -22.5 -12.0 -19.5
3 -24.0 -25.5 -15.0 -22.5
2 -27.0 -28.5 -18.0 -25.5
1 -30.0 -31.5 -21.0 -28.5
0 mute mute mute mute
Table 22 Mixer Input Volume Registers
Mixer Input
Playback Volume
Register
Record Volume
Register
Audio 1 14h –
Audio 2 7Ch 69h
Microphone 1Ah 68h
Music DAC (FM/
ES689/ES69x/I
2
S)
36h 6Bh
AuxA (CD) 38h 6Ah
AuxB 3Ah 6Ch
Line 3Eh 6Eh
Mono In 6Dh 6Fh