saa6752hs NXP Semiconductors, saa6752hs Datasheet - Page 25

• Manufacturer Part Number: saa6752hs
• Description: Mpeg-2 Video And Mpeg-audio/ac-3 Audio Encoder With Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.4.4
In order to be able to cope with analog and digital sources, the I
slave (digital). For the slave mode however, a sample rate converter will be involved, except for DVD-compliant audio
bypass. Table 4 reflects the different configuration possibilities.
Table 4 Audio input processing modes
Notes
1. Processing modes can be changed when SAA6752HS is in Idle mode.
2. In master mode, the external audio source must use the SAA6752HS audio clock as a clock source.
3. A sample rate conversion process will convert incoming data to a nominal 48 kHz audio frequency that is locked to
4. The sample rate conversion input frequency range has been selected to be compatible with class 2 SPDIF receivers.
5. 24-bit input option only applies to I
6. Only for SAA6752HS/V103.
7. In systems that use 16 Mbit SDRAM due to system architecture constraints, LPCM bypass must be restricted to be
8. The IEC 60958 format defines 20 bits for an audio sample, plus 4 auxiliary bits, which can be used to extend the word
9. For DVD-compliant bypass mode the audio clock must be locked to the video clock externally.
2004 Jan 26
MPEG-1 L2 encoding
DDC encoding
LPCM bypass (uncompressed
audio format)
DVD-compliant audio bypass
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
PROCESSING MODE
V-sync of the video input signal (if present). The sample rate converter is not enabled for DVD-compliant bypass
mode.
SAA6752HS before processing. EIAJ formats are limited to 20 bits maximum.
used with I and IP video encoding only. There is no constraint if 64 Mbit SDRAM is used.
length. IEC 61937 uses only 16 data bits of each IEC 60958 sub-frame. It depends on the settings of an external
SPDIF to I
A
UDIO INPUT PROCESSING
(7)
2
S converter if 16, 18, 20 or 24 bits are transferred to the SAA6752HS.
(6)
(1)
LPCM at 16, 18, 20
or 24 bits
LPCM at 16, 18, 20
or 24 bits
LPCM at 16, 18, 20
or 24 bits
16 bits
AUDIO CONTENT
2
S input formats, in this event it will be truncated to 20 bits internally in the
FORMAT
(8)
(5)
(5)
(5)
48
48
48
MASTER
25
FREQUENCY (kHz)
2
INPUT SAMPLE
S input ports can be configured as master (analog) or
(2)
32 kHz 0.1%
44.1 kHz 0.1%
48 kHz 0.1%
32 kHz 0.1%
44.1 kHz 0.1%
48 kHz 0.1%
32 kHz 0.1%
44.1 kHz 0.1%
48 kHz 0.1%
48 kHz
SLAVE
(9)
(3)(4)
20
20
16
16
ENCODED
NO. OF
BITS
SAA6752HS
Product specification
256, 384
256, 384
ENCODED
BIT RATE
(kbit/s)