alc268 Realtek Semiconductor Corporation, alc268 Datasheet - Page 26

• Manufacturer Part Number: alc268
• Description: 2+2 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

The cadence ‘12-11-11-12-11-11-12-11-11-12-11-11-11- (repeat)’ interleaves 13 frames containing no
sample blocks in every 160 frames. It provides a low long-term frequency drift for 44.1kHz of delivery
rate. Rates in sub-multiples (1/n) of 44.1kHz also follow this cadence and interleave n empty frames.
Rates in multiples (n) of 44.1kHz applying this cadence contain n sample blocks in the non-empty frame
and interleave an empty frame between non-empty frames (Table 9, page 19).
2+2 Channel High Definition Audio Codec
N: No sample block in a frame
Y: One sample block in a frame
Y
(Sub) Multiple
x
: X sample blocks in a frame
192kHz
12kHz
16kHz
32kHz
48kHz
96kHz
8kHz
Rate
1/6
1/4
1/3
1/2
2/3
1
2
4
48kHz Base
8kHz (1 sample block every 6 frames)
12kHz (1 sample block every 4 frames)
16kHz (1 sample block every 3 frames)
-
32kHz (2 sample blocks every 3 frames)
48kHz (1 sample block per frame)
96kHz (2 sample blocks per frame)
192kHz (4 sample blocks per frame)
Delivery Cadence
YNNNNN (repeat)
YNNN (repeat)
YNN (repeat)
Y
Y (repeat)
Y
Y
2
2
4
NN (repeat)
(repeat)
(repeat)
Table 7.
Table 8.
Defined Sample Rate and Transmission Rate
48kHz Variable Rate of Delivery Timing
18
44.1kHz Base
-
11.025kHz (1 sample block every 4 frames)
-
22.05kHz (1 sample block every 2 frames)
-
44.1kHz (1 sample block per frame)
88.2kHz (2 sample blocks per frame)
176.4kHz (4 sample blocks per frame)
Description
One sample block is transmitted in every 6 frames
One sample block is transmitted in every 4 frames
One sample block is transmitted in every 3 frames
One sample block is transmitted in every 6 frames
One sample block is transmitted in every 6 frames
Two sample blocks are transmitted in each frame
Four sample blocks are transmitted in each frame
Track ID: JATR-1076-21
ALC268 Series
Datasheet
Rev. 1.3