REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 1 of 11
M65850P/FP
Digital Echo (Digital Delay) REJ03F0171-0201
Rev.2.01
Jan 25, 2008
Description
The M65850P/FP is a CMOS IC for generating echo to be added to the voice through a Karaoke microphone.
It is optimal to provide the echo effect function for Karaoke player, such as radio cassette recorders, mini audio
components and television sets.
Increased master clock frequency assures high-performance short delay, enabling the IC to be used for Dolby prologic
surround system.
Features
• Built-in input/output filters, A/D and D/A converters, and memory realize a delay system with only a single chip.
• Built-in current control type clock oscillator circuit avoids clock affection outside, thus allowing prevention of
undesired ra di at i on.
• Delay time = 164 ms (with master clock set at 1 MHz)
(Selection of delay time in a range between 15 ms and 200 ms)
• Small package (1 4-pin DIP: PR DP0014AA- A (1 4P 4) , 16 -pin SOP: PRSP 0016DE-A (1 6 P2 N- A) )
• Built-in 20 Kbit SRAM
• Built-in auto reset circuit (The IC reset as power is turned on)
• Single power supply (5 V)
Recommended Operating Condition
• Supply volta ge range: VCC = 3.5 to 5.5 V
• Rated supply voltage: VCC = 5 V
System Configuration
L
R
MIC1
MIC2
Vocal
cut
HPF MIX
RAM
MIX
MIX
L
R
BASS
BASSMIX
MIX
HPF
MIC VOL
MIC VOL
LPF Key control
MIC AMP
MIC AMP
MIX
Echo
M65850P/FP
Echo VOL
Note: Dolby is the registered trademarks of Dolby Labo ratories Licensing Corporation.
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 2 of 11
Block Diagram
12
1 2
LPF1 IN LPF1 OUT 4
OP1 IN
REF
13 6
1/2 V
CC
LPF1
Auto
reset
CLOCK
CLOCK CC2 11
OP2 IN 10
OP2 OUT 9
LPF2 IN 8
LPF2 OUT
• M65850P
MO
MI
DO1
D1 DO0
Oscillator D/A
A/D
3
OP1 OUT 5
CC1 7
GND 14
V
CC
8
GND 15
V
CC
RESET Main control 20 kbit
SRAM
LPF2
13
2 3
LPF1 IN LPF1 OUT 5
OP1 IN
REF
16NC
1NC
14 7
1/2 V
CC
LPF1
Auto
reset
CLOCK
CLOCK CC2 12
OP2 IN 11
OP2 OUT 10
LPF2 IN 9
LPF2 OUT
• M65850FP
MO
MI
DO1
D1 DO0
Oscillator D/A
A/D
4
OP1 OUT 6
CC1
RESET Main control 20 kbit
SRAM
LPF2
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 3 of 11
Pin Arrangement
M65850P M65850FP
LPF1 IN
LPF1 OUT
OP1 OUT
OP1 IN
CC1
CC2
GND
V
CC
CLOCK
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
(Top view)
Outline: PRDP0014AA-A (14P4)
NC
LPF1 IN
LPF1 OUT
OP1 OUT
OP1 IN
CC1
CC2
GND
NC
V
CC
CLOCK
REF
OP2 IN
LPF2 IN
OP2 OUT
LPF2 OUT
11
2
3
4
5
6
7
14 16
15
14
13
12
11
10
9
78
6
5
4
3
2
9
10
11
12
13
8
(Top view)
Outline: PRSP0016DE-A (16P2N-A)
Pin Description
Pin No.
P FP
Symbol Name I/O Function
1 2 LPF1 IN Low pass filter 1 input I
2 3 LPF1 OUT Low pass filter 1 output O To form input-side low pass filter b y connecting
external capacit or and resistor
3 4 OP1 OUT Operational amplifier 1 output O
4 5 OP1 IN Operational amplifier 1 input I To form A/D conversion integrator by connecting
external capaci t or
5 6 CC1 Current control 1 — ADM control of A/D converter
6 7 CC2 Current control 2 — ADM control of D/A converter
7 8 GND GND —
8 9 LPF2 OUT Low pass filter 2 output O
9 10 LPF2 IN Low pass filter 2 input I To form input-side low pass filter by connecting
external capacit or and resistor
10 11 OP2 OUT Operational amplifier 2 output O
11 12 OP2 IN Operational amplifier 2 input I To form D/A conversion integrator by connecting
external capaci t or
12 13 REF Reference — Analog reference voltage ≈ 1/2 VCC
13 14 CLOCK Clock generator input I To form clock generator by connecting e xternal
resistor
14 15 VCC Supply voltage —
To apply 3.5 to 5.5 V power
(Rated voltage: 5 V)
— 1, 16 NC No connection —
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 4 of 11
Absolute Maximum Ratings
(Ta = 25°C, unless otherwise noted)
Item Symbol Ratings Units Conditions
Supply voltage VCC 6.0 V
Circuit current ICC 100 mA
Power dissipation Pd 800 (P), 550 (FP) mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +125 °C
Recommended Operating Condition
Limits
Item Symbol
Min Typ Max Unit Conditions
Supply voltage VCC 3.5 5 5.5 V
Clock frequency fck 0.8 — 11.0 MHz
Electrical Characteristics
(VCC = 5 V, f = 1 kHz, Vi = 100 mVrms, = 1 MHz, Ta = 25°C, unless otherwise noted)
Limits
Item Symbol
Min Typ Max Unit Test Conditions
Circuit current ICC 5 13 25 mA No signal input
Voltage gain GV –3.0 0 3.0 dB RL = 47 kΩ
Maximum output voltage Vomax 0.7 1.0 — Vrms THD = 10%
Total harmonic distortion THD — 1.2 3.0 % 30 kHz LPF
Output noise voltage No — –85 –70 dBV DIN-AUDIO
Clock frequency fck 0.85 1 1.15 MHz RC = 120 kΩ
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 5 of 11
Function Description
1. Delay time Td
The delay time can be calculated by the equation:
Td = 8N / (N = the number of memory bits = 20480)
When = 1 MHz (fs = 125 kHz), Td can be set at 164 ms.
<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= 1 MHz / 8 = 125 kHz
2. Clock oscillator circuit
The M65850P incorporates a current control type clock 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 occurren ce of undesired radiation without affecting any external circuit.
The oscillator frequency is:
fck = 1 MHz ( RC = 120 kΩ)
The resistor for current control can be calculated us ing th e following equation.
Rc ≈ K / Clock frequency (fck) [Ω]
RC
VCC
13
*
* (FP: 14)
Clock
oscillator
circuit
Clock frequency: fck
K is the coefficient, and changes according to clock frequency, as shown below. (VCC = 5 V, Ta = 25°C)
Delay Time (ms) Clock Frequency (Hz) K Value RC (Ω)
15 to 30 11.0 M to 5.5 M 0.8 × 1011 7.5 k to 15 k
31 to 100 5.3 M to 1.64 M 1.0 × 1011 18 k to 62 k
101 to 200 1.62 M to 800 k 1.2 × 1011 75 k to 150 k
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 6 of 11
3. Input/output LPF
It is necessary to change the LPF setting (signal pass band, fsig) of digital echo accord ing to the clock frequency.
(Refer to the table below)
LPF1
+
–
1
* (FP: 2) * (FP: 3)
REF
R2
C1
C2
R1R1
2*
*
+
–
9
* (FP: 10) * (FP: 9)
REF
R2
C1
C2
R1R1
8*
*
LPF2
∴ fsig = 1
2π C1 • C2 • R1 • R2
(VCC = 5 V, Vi = 100mVrms, f = 1 kHz, Ta = 25°C)
LPF
Delay Time
(ms) Clock
Frequency (Hz) Signal Pass
Band (Hz) R1 (Ω) R2 (Ω) C1 (F) C2 (F)
Distortion
(Reference Value)
(%)
15 to 30 11.0 M to 5.5 M 7 k 15 k 15 k 3300 p 680 p 0.2%
(Td = 20 ms)
31 to 100 5.3 M to 1.64 M 5 k 13 k 13 k 4700 p 1000 p 0.3%
(Td = 50 ms)
101 to 200 1.62 M to 800 k 3 k 16 k 16 k 6800 p 1500 p 1.2%
(Td = 160 ms)
4. Mute
When power is turned on, the mute function works automatically to prevent noise gene ration.
(Here, however, “m ute” m eans the function which prevents noise generation after the reset time.)
Reset
period
Power on
time Mute off
time
Mute period
(about 260 ms)
When power is ON (fck = 1 MHz)
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 7 of 11
Test Conditions
Item Symbol S1 S14 Remarks
Circuit current ICC 2 2 No-signal time
Voltage gain between input a nd output GV 1 1 RL = 47 kΩ
Maximum output voltage Vomax 1 1 THD = 10%
Output distortion THD 1 1 30 kHz LPF
Output noise voltage No 2 1 DIN-AUDIO
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 8 of 11
Test Circuit
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
VCC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
S14
(1)
(2)
S1
(1)
(2)
14 13 12 11 10 98 Vo
1234567
+
+
1500 p
1500 p
1 μ
1 μ
0.068 μ
120 k
16 k
16 k
16 k
16 k
6800 p
6800 p
0.22 μ0.22 μ
0.1 μ47 μ
+
+
47 μ16 k
51
47 k
16 k
A
Vi
0.068 μ
• M65850P
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
VCC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
S15
(1)
(2)
S2
(1)
(2)
15 14 13 12 11 10 9 Vo
2
NC NC
16
1 345678
+
+
1500 p
1500 p
1 μ
1 μ
0.068 μ
120 k
16 k
16 k
16 k
16 k
6800 p
6800 p
0.22 μ0.22 μ
0.1 μ47 μ
+
+
47 μ16 k
51
47 k
16 k
A
Vi
0.068 μ
• M65850FP
Units R: Ω
C: F
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 9 of 11
Application Example
1. Echo
Delay time 164 ms (Signal pass band 3 kHz)
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
VCC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
14 13 12 11 10 9 8
1 2 3 4 5 6 7
+
+
1 μ
1 μ
IN
OUT
0.068 μ
1500 p
0.068 μ
0.15 μ
120 k
16 k
16 k 16 k
50 k
16 k
6800 p
6800 p
0.22 μ0.22 μ
0.1 μ47 μ
+
+
47 μ16 k
16 k
Feedback gain
setting volume
Feedback gain
setting volume
• M65850P
1500 p
+
+
1 μ
1 μ
IN
OUT
0.068 μ
1500 p
0.068 μ
0.15 μ
120 k
16 k
16 k 16 k
50 k
16 k 6800 p
6800 p
0.22 μ0.22 μ
0.1 μ47 μ
+
+
47 μ16 k
16 k
• M65850FP
1500 p
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
VCC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
15 14 13 12 11 10 9
2
NC NC
16
1 345678
Units R: Ω
C: F
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 10 of 11
2. Surround
Delay time 20 ms (Signal pass band 7 kHz)
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
V
CC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
14 13 12 11 10 9 8
1 2 3 4 5 6 7
+
+
1 μ
1 μ
IN
OUT
0.047 μ
680 p
0.047 μ
11 k
15 k
15 k 15 k
15 k 3300 p
3300 p
0.15 μ0.15 μ
0.1 μ47 μ
+
+
47 μ15 k
15 k
• M65850P
680 p
+
+
1 μ
1 μ
IN
OUT
0.047 μ
680 p
0.047 μ
11 k
15 k
15 k 15 k
15 k 3300 p
3300 p
0.15 μ0.15 μ
0.1 μ47 μ
+
+
47 μ15 k
15 k
• M65850FP
680 p
LPF1 IN
LPF1 OUT
OP1 OUT
CLOCK
OP1 IN
CC1
CC2
GND
V
CC
REF
OP2 IN
OP2 OUT
LPF2 IN
LPF2 OUT
15 14 13 12 11 10 9
2
NC NC
16
1 345678
Units R: Ω
C: F
M65850P/FP
REJ03F0171-0201 Rev.2.0 1 Jan 25, 2008
Page 11 of 11
Package Dimensions
INCLUDE TRIM OFFSET.
DIMENSION "*3" DOES NOT
NOTE)
DO NOT INCLUDE MOLD FLASH.
DIMENSIONS "*1" AND "*2"1.
2.
*3
*2
*1
14 8
71
SEATING PLANE
E
D
e
L A
A1 A2
e1
c
b3 bp
2.792.29
4.5
A
1
b
3
15°
e2.54
c
L3.0
0.51
1.4 1.5 1.8
A
E6.15 6.3 6.45
D18.8 19.0 19.2
Reference
Symbol
Dimension in Millimeters
Min Nom Max
0.22 0.27 0.34
P-DIP14-6.3x19-2.54 1.0g
MASS[Typ.]
14P4PRDP0014AA-A
RENESAS CodeJEITA Package Code Previous Code
b
p
0.4 0.5 0.6
e
1
7.627.32 7.92
A
2
3.3
0°
2.
1. DIMENSIONS "*1" AND "*2"
DO NOT INCLUDE MOLD FLASH.
NOTE)
DIMENSION "*3" DOES NOT
INCLUDE TRIM OFFSET.
1.421.12
b
p
A
1
H
E
y0.1
e1.27
c0° 8°
L0.4 0.6 0.8
00.1 0.2
A2.1
7.5 7.8 8.1
A
2
1.8
E5.2 5.3 5.4
D10.0 10.1 10.2
Reference
Symbol
Dimension in Millimeters
Min Nom Max
0.35 0.4 0.5
0.18 0.2 0.25
P-SOP16-5.3x10.1-1.27 0.2g
MASS[Typ.]
16P2N-APRSP0016DE-A
RENESAS CodeJEITA Package Code Previous Code
Detail F
A
1
A
2
L
*3
*2
*1
1 8
916
F
Index mark
y
c
b
p
A
e
D
E
H
E
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