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DA7217

Ultra-Low Power Stereo Codec

Datasheet

Revision 2.5

01 Sep 2016

CFR0011-120-00

29 of 171

The second DMIC input is controlled in the same way using DMIC_2_CTRL.

Table 27: Digital Microphone Control Bits

Function

Bit Setting

Digital microphone enable/disable

dmic_1r_en

dmic_1l_en

dmic_2l_en

dmic_2r_en

DMIC is disabled

DMIC is enabled

Digital microphone clock rate

dmic_l_clk_rate

dmic_2_clk_rate

3 MHz

1.5 MHz

Digital microphone sample phase

dmic_1_samplephase

dmic_2_samplephase

Data sampled on

the clock edges

Data sampled

between the clock

edges

Digital microphone left/right data

selection

dmic_1_data_sel

dmic_2_data_sel

Rising edge = left

Falling edge = right

Rising edge = right

Falling edge = left

9.2.1.4

Input Amplifiers

The two input amplifiers provide an additional gain stage between the microphone amplifiers (see

section 9.2.1.2 and Figure 7) and the ADC inputs. The input amplifier (MIXIN_1_CTRL) is enabled by

setting mixin_1_amp_en = 1.

The gain can be set in the range of

–4.5 dB to +18 dB in 1.5 dB steps using MIXIN_1_GAIN. It is

recommended that gain updates be ramped through all intermediate values by setting

mixin_1_amp_ramp_en = 1. This ramp setting overrides the settings of mixin_1_amp_zc_en.

As an alternative to zero-cross synchronization, gain updates can be synchronized with signal zero-

crossings by setting mixin_1_amp_zc_en = 1. If no zero-crossing is detected within the timeout

period of approximately 100 ms, the update is applied unconditionally.

The amplifier can be muted using mixin_1_amp_mute_en.The single input to the first amplifier can

be deselected by setting mixin_1_mix_sel = 0.

The second input amplifier (MIXIN_2_CTRL) is controlled in the same manner as MIXIN_1_CTRL.

Table 28: MIXIN_1_GAIN and MIXIN_2_GAIN Gain Settings

mixin_1_amp_gain

mixin_2_amp_gain

Amplifier Gain (dB)

0000

-4.5

0001

-3.0

0010

-1.5

0011

0.0

0100

1.5

0101

3.0

0110

4.5

0111

6.0

1000

7.5

1001

9.0

1010

10.5

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