NAU8812EVB Nuvoton Technology Corporation of America, NAU8812EVB Datasheet - Page 18

• Manufacturer Part Number: NAU8812EVB
• Description: BOARD EVAL FOR NAU8812
• Manufacturer: Nuvoton Technology Corporation of America
• Series: emPowerAudio™r

Specifications of NAU8812EVB

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

The NAU8812 features a low-noise, high common mode rejection ratio (CMRR), differential microphone inputs (MIC-
& MIC+ pins) which are connected to a PGA Gain stage. The differential input structure is essential in noisy digital
systems where amplification of low-amplitude analog signals is necessary such as notebooks and PDAs. When
properly employed, the differential input architecture offers an improved power-supply rejection ratio (PSRR) and
higher ground noise immunity.
PMICPGA[0]
NMICPGA[1]
emPowerAudio
Datasheet Revision 2.0
12.1.2. The differential microphone input (MIC- & MIC+ pins)
Bit(s)
From AUX
™
stage
MIC-
MIC+
0x2C
0x2C
Addr
Table 2: Register associated with Input PGA Contro
VREF
NMICPGA[1]
AUXPGA[2]
PMICPGA[0]
Positive Microphone to PGA
Negative Microphone to PGA
Figure 6: Input PGA Circuit Block Diagram
(0x2C)
(0x2C)
(0x2C)
Parameter
Page 18 of 109
PGAGAIN[5:0]
R
R
R
(0x2D)
-12 dB to +35.25 dB
0 = Input PGA Positive terminal to VREF
1 = Input PGA Positive terminal to MICP
0 = MICN not connected to input PGA
1 = MICN to input PGA Negative terminal.
PGAGAIN[5:0]
AUXPGA[2]
PGAGAIN[5:0]
NMICPGA[1]
(0x2C)
(0x2D)
(0x2C)
(0x2D)
Programmable Range
R
R
NAU8812
January 2011
To PGA
Boost