AK4128AEQP AKM Semiconductor Inc, AK4128AEQP Datasheet - Page 32

• Manufacturer Part Number: AK4128AEQP
• Description: IC SAMPLE RATE CONVERTER 64LQFP
• Manufacturer: AKM Semiconductor Inc
• Series: -r
• Type: Sample Rate Converterr

Specifications of AK4128AEQP

• Applications: Automotive Systems, Home Theater, TV
• Mounting Type: Surface Mount
• Package / Case: 64-FQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 974-1043

■
The AK4128A includes a dither circuit. The dither circuit adds a dither signal after the lowest bit of all the output data set
by the OBIT1-0 pins when the DITHER pin = “H”, regardless of SRC and SRC bypass modes. If the output bit is 24bit
length in SRC bypass mode, the output code does not change by the DITHER pin setting.
■
The AK4128A includes a digital de-emphasis filter (tc = 50/15μs) by an IIR filter. This filter corresponds to three
frequencies (32kHz, 44.1kHz and 48kHz). In parallel control mode (SPB pin = “L”), de-emphasis setting of SRC1-4 are
controlled together by DEM1-0 pins. In serial control mode (PSB pin = “H”), the setting of DEM1-0 pins is ignored. SRC1
reflects the DEM[11:10] bits setting, SRC2 reflects the DEM[21:20] bits setting, SRC3 reflects the DEM[31:30] bits
setting, and SRC4 reflects the DEM[41:40] bits setting.
MS1242-E-01
Dither
De-emphasis Filter
Table 11. De-emphasis Filter Setting for SDTI1 (Serial Control Mode (SPB pin = “H”))
Table 13. De-emphasis Filter Setting for SDTI3 (Serial Control Mode (SPB pin = “H”))
Table 14. De-emphasis Filter Setting for SDTI4 (Serial Control Mode (SPB pin = “H”))
Table 12. De-emphasis Filter Setting for SDTI2 (Serial Control Mode (SPB pin= “H”))
Table 10. De-emphasis Filter Setting (Parallel Control Mode (SPB pin= “L”))
DEM11pin
DEM21 bit
DEM31 bit
DEM41 bit
DEM11bit
H
H
L
L
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
DEM10 pin
DEM10 bit
DEM20 bit
DEM30 bit
DEM40 bit
- 32 -
H
H
L
L
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
Mode(SDTI1-4)
Mode(SDTI1)
Mode(SDTI2)
Mode(SDTI3)
Mode(SDTI4)
44.1kHz
44.1kHz
44.1kHz
44.1kHz
44.1kHz
48kHz
32kHz
48kHz
32kHz
48kHz
32kHz
48kHz
32kHz
48kHz
32kHz
OFF
OFF
OFF
OFF
OFF
[AK4128A]
2011/06