TWR-AUDIO-SGTL Freescale Semiconductor, TWR-AUDIO-SGTL Datasheet - Page 58

• Manufacturer Part Number: TWR-AUDIO-SGTL
• Description: TWR SYS Audio Board
• Manufacturer: Freescale Semiconductor
• Series: Kinetisr

Specifications of TWR-AUDIO-SGTL

• Kit Contents: TWR-AUDIO-SGTL Featuring SGTL5000 Low Power Stereo Codec, Printed Quick Start Guide
• Mcu Supported Families: K20, K50, MCF51Jx
• Kit Features: SGTL5000 Low Power Stereo Codec With Headphone
• Rohs Compliant: Yes
• Design Resources: TWR-AUDIO-SGTL Schematics
• Accessory Type: Module, Audio with CODEC
• Description/function: Audio CODECs
• Mounting Style: Press Fit
• Product: Audio Modules
• Features: SGTL5000 Low Power Stereo Codec With Headphone Amplifier, Stereo Line-in / Line-out On 3.5mm Jack
• Lead Free Status / Rohs Status: Details
• For Use With/related Products: Freescale Tower System

Table 55. DAP_AVC_THRESHOLD 0x0126
Table 56. DAP_AVC_ATTACK 0x0128
Table 57. DAP_AVC_DECAY 0x012A
58
SGTL500
FUNCTIONAL DEVICE OPERATION
PROGRAMMING EXAMPLES
15:12
15:12
BITS
BITS
BITS
15:0
11:0
11:0
15
15
15
14
14
14
RSVD
RSVD
THRESH
FIELD
FIELD
FIELD
RSVD
RSVD
RATE
RATE
13
13
13
12
12
12
RW
RW
RW
RW
RW
RW
RO
RO
11
11
11
RESET
0x1473
RESET
RESET
0x28
0x50
0x0
0x0
10
10
10
AVC Threshold Value
Threshold is programmable. Use the following formula to calculate hex value:
Hex Value = ((10^(THRESHOLD_dB/20))*0.636)*2^15
Threshold can be set in the range of 0 dB to -96 dB
Example Values:
0x1473 = Set Threshold to -12 dB
0x0A40 = Set Threshold to -18 dB
Reserved
AVC Decay Rate
This is the rate at which the AVC releases the attenuation previously applied to the
signal during attack. AVC Decay Rate is programmable. To use a custom rate, use the
formula below to convert from dB/S to hex value:
Hex Value = (1 - (10^(-(Rate_dBs/(20*SYS_FS)))) * 2^23
where, SYS_FS is the system sample rate configured in CHIP_CLK_CTRL register.
Example values:
0x284 = 32 dB/s
0xA0 = 8.0 dB/s
0x50 = 4.0 dB/s
0x28 = 2.0 dB/s
Reserved
AVC Attack Rate
This is the rate at which the AVC will apply attenuation to the signal to bring it to the
threshold level. AVC Attack Rate is programmable. To use a custom rate, use the
formula below to convert from dB/S to hex value:
Hex Value = (1 - (10^(-(Rate_dBs/(20*SYS_FS)))) * 2^19
where, SYS_FS is the system sample rate configured in CHIP_CLK_CTRL register.
Example values:
0x28 = 32 dB/s
0x10 = 8.0 dB/s
0x05 = 4.0 dB/s
0x03 = 2.0 dB/s
9
9
9
8
8
8
THRESH
7
7
7
6
6
6
RATE
RATE
DEFINITION
DEFINITION
DEFINITION
5
5
5
Analog Integrated Circuit Device Data
4
4
4
3
3
3
Freescale Semiconductor
2
2
2
1
1
1
0
0
0