MITSUBISHI SOUND PROCESSOR ICs
S E R IE S
S E R IE S
M65850P/FP
DIGITAL ECHO(DIGITAL DELAY)
50
KARAOKE
FUNCTION DESCRIPTION
(1) Delay time Td
The delay time can be calculated by the equation :
Td=8N / fck ( N=the number of memory bits=20480 )
When fck=1MHz ( fs=125kHz), Td can be set at 164ms.
« Reference »
The M65850P/FP adopts ADM ( Adaptive Delta Modulation ) system in A-D,D-A
converters.
The sampling frequency can be calculated by the following equation :
fs=clock frequency / 8 ( Hz )
For clock frequency ( fck )=1MHz, the calculated sampling frequency is :
fs=1MHz / 8 =125kHz
(2) Clock oscillator circuit
The M65850P incorporates a current control type clock
Vcc
oscillator circuit in it, thus providing circuit configuration just by
connecting a resistor for current control to pin 13 ( FP:pin 14 )
CLOCK.
Fully internal clock supply prevents occurrence of undesired
radiation without affecting any external circuit.
Clock
oscillator
circuit
Rc
*
13
The oscillator frequency is:
fck = 1 MHz. ( Rc=120kW)
(FP:14)
*
The resistor for current control can be calculated using the
following equation.
Clock
frequency : fck
•
Rc K/Clock frequency (fck) [ Hz ]
•
K is the coefficient, and changes according to clock frequency
,as shown below.
Clock Frequency
( Hz )
Delay Time
( ms )
K value
Rc ( W)
7.5k~15k
18k~62k
75k~150k
11
0.8 X 10
15~30
31~100
101~200
11.0M~5.5M
5.3M~1.64M
1.62M~800K
11
1.0 X 10
11
1.2 X 10
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