MAX9860EVKIT+ Maxim Integrated Products, MAX9860EVKIT+ Datasheet - Page 31

• Manufacturer Part Number: MAX9860EVKIT+
• Description: KIT EVALUATION FOR MAX9860
• Manufacturer: Maxim Integrated Products

Specifications of MAX9860EVKIT+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 10. AGC and Noise Gate Registers (continued)
AGCTH
ANTH
BITS
______________________________________________________________________________________
Noise Gate Threshold
The signal level at which the noise gate begins reducing the gain. When the signal level is above the
threshold the noise gate has no effect. When the signal level is below the threshold, the noise gate
decreases the gain by 1dB for every 2dB the signal is below the threshold.
The noise gate can be enabled independently from AGC. When AGC is enabled, PGAM must be set to
+20dB (indicating a small signal is present) for the noise gate to attenuate.
For microphone signals, use the noise gate and AGC simultaneously with ANTH set between -16dB
and -28dB.
AGC Signal Threshold
The target output signal level. When the signal level is below the threshold, the AGC increases the
gain. The signal level is measured after ADCRL and ADCLL are applied to the ADC output.
ANTH[3:0]
ANTH[3:0]
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
16-Bit Mono Audio Voice Codec
LEVEL (dBFS)
LEVEL (dBFS)
Disabled
-72
-68
-64
-60
-56
-52
-48
-10
-3
-4
-5
-6
-7
-8
-9
ANTH[3:0]
ANTH[3:0]
FUNCTION
0xA
0xB
0xC
0xD
0xA
0xB
0xC
0xD
0x8
0x9
0xE
0xF
0x8
0x9
0xE
0xF
LEVEL (dBFS)
LEVEL (dBFS)
-44
-40
-36
-32
-28
-24
-20
-16
-11
-12
-13
-14
-15
-16
-17
-18
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