ak4140vf AKM Semiconductor, Inc., ak4140vf Datasheet - Page 18

• Manufacturer Part Number: ak4140vf
• Description: Digital Btsc Decoder
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
„ Audio Sampling Rate
The AK4140 supports 3 sampling rates as 32kHz, 44.1kHz and 48kHz.
„ Digital High Pass Filter
The AK4140 has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 1Hz
(@fs=48kHz) and scales with sampling rate (fs).
„ Pilot/SAP/Noise Detection (read)
PILOT bit: Pilot Signal Detection
SAP bit: SAP Signal Detection
MS0547-E-01
0 Æ 1 :
1 Æ 0 :
0 Æ 1 :
1 Æ 0 :
Pilot Signal Level
Pilot Signal Level
SAP Signal Level
SAP Signal Level
SAP Threshold Level (STHR1,0 bit)
Pilot Threshold Level (PTHR1,0 bit)
Pilot Threshold Level (PTHR1,0 bit)
SAP Threshold Level (STHR1,0 bit)
- SAP Hysteresis Level (SHYS1,0 bit) / 2 (in dB)
+ SAP Hysteresis Level (SHYS1,0 bit) / 2 (in dB)
FS1
0
0
1
1
Not detected
+ Pilot Hysteresis Level (PHYS1,0 bit) / 2 (in dB)
Not detected
- Pilot Hysteresis Level (PHYS1,0 bit) / 2 (in dB)
Pilot signal
SAP signal
Detected
Detected
Table 5. Pilot Signal Detection
Table 6. SAP Signal Detection
Table 4. Sampling rate select
FS0
0
1
0
1
PILOT bit
- 18 -
SAP bit
Sampling rate
(Reserved)
1
0
1
0
44.1kHz
32kHz
48kHz
(default)
(default)
(default)
[AK4140]
2007/03