SM5950BM NPC, SM5950BM Datasheet - Page 15

• Manufacturer Part Number: SM5950BM
• Description: Asynchronous Sample Rate Converter
• Manufacturer: NPC

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Group Delay Time
If t
t
t
the group delay is given by:
t
Response Time
The conversion rate detector stage requires a certain amount of time to calculate the sample rate conversion
ratio with accuracy. The minimum response time, after the SM5950BM input sampling frequency (fsi: LRCI
input) and output sampling frequency (fso: derived from SCKO) have stabilized sufficiently, is the time
required to determine the sample rate conversion ratio to 16-bit accuracy after reset is cleared, and is given by:
INPUT
OUTPUT
OUTPUT
INPUT
Response time = 16384/fso (371ms at fso = 44.1kHz)
– t
Data waveform image
and t
: Serial input data (fsi rate) read end timing (LRCI clock rising edge)
: Serial output data (fso rate) output start timing (LRCO clock rising edge)
INPUT
Serial data input
OUTPUT
1/fs
= (48.41 ± 8.41)/fsi
1/fso
t
t
are defined as:
INPUT
INPUT
(48.41 ± 8.41)/fsi
t
SM5950BM
OUTPUT
– t
INPUT
SEIKO NPC CORPORATION —15
t
t
OUTPUT
OUTPUT
Serial data output