DA7217 datasheet(36/157 Pages) RENESAS

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Ultra-Low Power Stereo Codec

R32DS0005EE0370 Revision 3.7

Aug 9, 2024

CFR0011-120-00

Page 36

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

1011

12.0

1100

13.5

1101

15.0

1110

16.5

1111

18.0

9.2.2

Analog to Digital Converters

The DA7217 codec contains stereo audio analog to digital converters (ADCs). These can run either in low-power

mode for always-on applications or in high-performance mode for other applications.

Each ADC is automatically enabled whenever the input filters are enabled and digital microphones are not

enabled.

Not all sample rates are supported in all modes. Table 29 describes which sample rates are supported in each

mode.

Table 29: Supported sample rates in different modes

Sample Rate (kHz)

Low Power Mode

adc_lp_mode = 1

Normal Mode

adc_lp_mode = 0

voice_en = 1

voice_en = 0

voice_en = 1

voice_en = 0

8.0

Supported

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