SGTL5000XNLA3R2 Freescale, SGTL5000XNLA3R2 Datasheet - Page 40

• Manufacturer Part Number: SGTL5000XNLA3R2
• Manufacturer: Freescale

Specifications of SGTL5000XNLA3R2

• Single Supply Voltage (typ): 1.8/2.5/3.3V
• Lead Free Status / RoHS Status: Compliant

the microphone gain and the internal microphone biasing
circuitry.
Table 27. CHIP_MIC_CTRL 0x002A
40
SGTL500
FUNCTIONAL DEVICE OPERATION
PROGRAMMING EXAMPLES
15:10
BITS
The
15
9:8
6:4
3:2
1:0
7
Table 27, CHIP_MIC_CTRL 0x002A
14
BIAS_RESISTOR
BIAS_VOLT
FIELD
RSVD
RSVD
RSVD
GAIN
13
RSVD
12
RW
RW
RW
RW
RO
RO
RO
11
RESET
10
0x0
0x0
0x0
0x0
0x0
0x0
register controls
BIAS_RESISTOR RSVD
9
Reserved
MIC Bias Output Impedance Adjustment
Controls an adjustable output impedance for the microphone bias. If this is set to zero
the micbias block is powered off and the output is highZ.
0x0 = Powered off
0x1 = 2.0 kohm
0x2 = 4.0 kohm
0x3 = 8.0 kohm
Reserved
MIC Bias Voltage Adjustment
Controls an adjustable bias voltage for the microphone bias amp in 250 mV steps. This
bias voltage setting should be no more than VDDA-200 mV for adequate power supply
rejection.
0x0 = 1.25 V
...
0x7 = 3.00 V
Reserved
MIC Amplifier Gain
Sets the microphone amplifier gain. At 0 dB setting the THD can be slightly higher than
other paths- typically around ~65 dB. At other gain settings the THD will be better.
0x0 = 0 dB
0x1 = +20 dB
0x2 = +30 dB
0x3 = +40 dB
8
7
6
BIAS_VOLT
DEFINITION
5
Analog Integrated Circuit Device Data
4
3
RSVD
Freescale Semiconductor
2
1
GAIN
0