PANASONIC AN6291

ICs for Cassette, Cassette Deck
AN6291, AN6291S
Dual dbx II Noise Reduction System ICs
AN6291
1.2±0.25
0.5±0.1
2.54
26.7±0.3
1.0±0.25
3.3±0.25
+ 0.1
.05
0.35 – 0
3 ~15˚
10.16±0.25
22-Lead DIP Package (DIP022-P-0400A)
AN6291S
22
21
20
19
18
17
16
15
14
13
12
0.3
7.2±0.3
9.4±0.3
22-Lead SOP Package (SOP022-P-0375)
15.3±0.3
1
2
3
4
5
6
7
8
9
10
11
0.15
0.925
1.09
Unit : mm
0.4±0.25
VCC (opr) =1.8V to 14V
22
21
20
19
18
17
16
15
14
13
12
4.7±0.25
1.27
■ Features
• Wide dynamic range : 110dB
• Low operating voltage : VCC (min.) =1.8V
• Fewer external components
• Adjustment : only one
• Low power consumption
• Wide operating supply voltage range :
Unit : mm
1
2
3
4
5
6
7
8
9
10
11
8.6±0.3
0.1±0.1
The AN6291 and the AN6291S are the single chip ICs
suitably developed for noise reduction of dbxII type and
used for stereo operation. They can be used for U.S.
sound multiplex TV. 1.8V low voltage operation enables
to apply for battery-operated equipment to the Hi-Fi deck.
Package is available for 22-pin DIL plastic and 22-pin
SOP package. Equipment can be minitualized and high
integration.
2.0±0.2
■ Overview
ICs for Cassette, Cassette Deck
AN6291, AN6291S
■ Block Diagram
VCC
NC
RMS
IN–B
TIMING
–B
CCA
IN–B
CAP
1–B
CAP
2–B
VOUT– B
22
21
20
19
18
17
16
15
ON – OFF
–B
I TIME ENCODE
14
13
12
VCC
–
RMS
OP
Amp.
CCA
+
Current
Source
Logic
Timing Current
+
RMS
OP
Amp.
CCA
–
Bias
GND
SUB
1
2
3
4
5
6
7
8
ADJ
GND
RMS
IN– A
TIMING
–A
CCA
IN– A
CAP
1– A
CAP
2– A
VOUT– A
9
ON – OFF
–A
■ Pin Descriptions
Pin No.
Pin Name
Pin No.
Pin Name
1
Adjustment of timing current
12
ENCODE
2
GND
13
I TIME
3
RMS IN-A
14
ON-OFF-B
4
TIMING-A
15
VOUT-B
5
CCA IN-A
16
CAP-2-B
6
CAP-1-A
17
CAP-1-B
7
CAP-2-A
18
CCA IN-B
8
VOUT-A
19
TIMING-B
9
ON-OFF-A
20
RMS IN-B
10
N.I.
21
NC
11
DECODE
22
VCC
10
11
N.I.
DECODE
ICs for Cassette, Cassette Deck
AN6291, AN6291S
■ Absolute Maximum Ratings (Ta=25˚C)
Symbol
Rating
Supply Voltage
Parameter
VCC
14.4
Unit
Supply Current
ICC
5
mA
mW
V
Power Dissipation (Ta=75˚C)
PD
100
Operating Ambient Temperature
Topr
–20 ~ + 75
˚C
AN6291
Tstg
–55 ~ + 125
˚C
AN6291S
Tstg
–40 ~ + 125
˚C
Storage Temperature
■ Electrical Characteristics (VCC=3V, Ta=25˚C)
Parameter
Input/Output Characteristics/ENCODE Mode
Input/Output Characteristics/DECODE Mode
Maximum Output
Voltage
Symbol
–2
0
+2
VIN= –40dB, f=1kHz
–23
–20
–17
VOD –1
VIN = + 10dB, f=1kHz
17
20
23
VOD –2
VIN=0dB, f=1kHz
–2
0
+2
VOD –3
VIN= –20dB, f=1kHz
–44
–40
–36
80
150
200
450
THDD
Noise Output
Voltage
ENCODE Mode
VNOE
DECODE Mode
VNOD
Difference Between
Channels
ENCODE Mode
CDE
DECODE Mode
CDD
CT
SVRR
ICC
Input/Output Characteristics/dbx OFF Mode
VOFF
Total Harmonic Distortion/dbx OFF Mode
THDOFF
Output Noise Voltage/dbx OFF Mode
Note) 0dB= 20mV= –34dBV
max.
VIN = 0dB, f=1kHz
VOME
Quiescent Current
typ.
VOE –3
VOMD
Ripple Rejection Ratio/DECODE Mode
7.5
VOE –2
DECODE Mode
Crosstalk/ENCODE Mode
min.
VIN = + 20dB, f=1kHz
ENCODE Mode
Total Harmonic Distortion/DECODE Mode
Condition
VOE –1
VnOFF
THD=1%, f=1kHz
10
Unit
12.5
dB
dB
mV
VO = + 14dB, f=1kHz
0.15
0.3
%
Input Short
A-weight
100
200
3
6
µV
–1.2
0
1.2
–1.2
0
1.2
50
60
VIN= 0dB, f=1kHz
Measuring channel : Short
Another channel : Output 200mV,
f=1kHz
f=60Hz, V=100mV, Input Short
VCC =3V, Input Short
VIN = + 20dB, f=1kHz
VIN = + 20dB, f=1kHz
Input Short, A-weight
40
17
dB
dB
dB
55
1.8
3.2
mA
20
23
dB
0.3
1
%
10
20
µV
ICs for Cassette, Cassette Deck
AN6291, AN6291S
0
–20
VOUT
–40
–60
–80
Vno
–100
–120
–140
+20
VCC= 3V
Vin= –34dBV
100
1k
VCC= 3V
Vin= – 34dBV
0
–20
VOUT
–40
–60
–80
–100
–120
1.0
0.5
0
20
10k 20k
1.5
Vno
–140
20
100
Frequency f (Hz)
1k
10k 20k
20
100
Frequency f (Hz)
THD – f (Decoder mode)
1k
10k 20k
Frequency f (Hz)
VOUT, THD –VIN (Encoder mode)
VOUT, THD–VIN (Decoder mode)
–10
2.0
VCC = 3V
Vin= – 34dBV
VCC= 3V
f= 1kHz
–0
VCC= 3V
f= 1kHz
1.5
–50
1.0
THD
–60
0
20
100
1k
Frequency f (Hz)
10k 20k
–70
–100
0.5
–80
–60
–40
–20
Input Voltage VIN (dBV)
0
0
+20
OU
T
2.0
–40
1.5
–60
1.0
–80
0.5
THD
–100
0
–70
–60
–50
–40
–30
Input Voltage VIN (dBV)
–20
Total Harmonic Distortion THD (%)
–40
–20
V
OU
2.0
Output Voltage VOUT (dBV)
0.5
–30
Total Harmonic Distortion THD (%)
1.0
V
1.5
T
–20
Output Voltage VOUT (dBV)
Total Harmonic Distortion THD (%)
THD – f (Encoder mode)
2.0
Total Harmonic Distortion THD (%)
VCC= 3V
Vin= – 34dBV
VOUT, Vno– f (Decoder mode)
Output Noise Voltage Vno, Output Voltage VOUT (dB)
Output Noise Voltage Vno, Output Voltage VOUT (dB)
VOUT, Vno– f (Encoder mode)
+20
ICs for Cassette, Cassette Deck
AN6291, AN6291S
■ Application Circuits
1 Switching circuit of recording/playback
+VCC
E
0.1µF
–
3.3kΩ
10µF
+
D
E
330pF
+ 0.47µF
2SC1327
+
0.033µF
51kΩ
–
SW1e
+
22µF
10µF
+
1kΩ
6800pF
–
Output
–B
–
0.01µF
15kΩ
1kΩ
10kΩ
150kΩ
6800pF
–
0.1µF 4.7kΩ 33kΩ 6.8kΩ
15kΩ
SW1b
0.0033µF
0.0033µF
270k
33kΩ
SW2a
OFF
ON
560Ω
–
15kΩ
+
10µF
SW1a
0.1µF
2700pF
D
330Ω
Input
–B
D
E
*2
21
20
19
18
17
16
15
RMS– B
CCA– B
OP
Amp.– B
RMS – A
CCA– A
OP
Amp.– A
14
13
9
10
12
Logic
22
Current
Source
SUB
1
2
3
4
5
6
7
8
–
2k
(B)
+
10kΩ
330pF
0.0033µF
0.0033µF
270kΩ
51kΩ
–
1µF
6800pF
1kΩ
0.033µF
2SC1327
1µF 4.7kΩ 33kΩ 6.8kΩ
–
+
330Ω
15kΩ
0.47µF 6800pF
D
–
SW1d
2700
pF
SW1e
3.3kΩ
33kΩ
0.1µF
15kΩ
+
22µF
10µF
–
150kΩ
11
+
*1
+
10µF
0.01µF
Output
–A
ON
– 560Ω
OFF
SW2b
51kΩ
E
+
0.1µF
E
D
Input
–A
Logical condition of recording/playback
Pin11
Pin12
Mode
VCC
Open
DECODE
Open
VCC
ENCODE
VCC
VCC
OFF
* 1 Signals of 1kHz, 20mV are applied to the input of both channels at the same time, sinking current into the Pin13 should be
adjusted to 15µA±5%. Standard value at VCC=3V is about 1kΩ.
* 2 External circuit should not be connected with Pin21. Connected in the IC.
* 3 Users should follow the latest technical information from dbx company. Constant number might be changed.
Note 1) All the resistors and the capacitor with the mark should be used in the error less than ±5%.
Note 2) S1a~ S1e : Switch record, playback (Above figure shows “PLAYBACK” mode).
Note 3) S2a~ S2b : dbx ON-OFF switch (Above figure shows “ON” mode).
ICs for Cassette, Cassette Deck
AN6291, AN6291S
2 Playback exclusive circuit (Designed noise at dbx OFF mode to be small)
+VCC
0.033µF 1kΩ
4700pF
0.47µF
Input
–B
–
+
10kΩ
10µF
+
150Ω
0.01
µF
560Ω
Output
–B
–
–
–
+
+
0.33µF
–
21
16kΩ
4.7kΩ
16kΩ
*2
NC
22
+
0.022µF
10µF
20
19
RMS– B
18
17
16
15
14
dbx
ON– OFF
Open
“ON”
(
)
12
OP
Amp.– B
CCA– B
Logic
1
2
RMS–A
3
4
*1
2kΩ
(B)
OP
Amp.– A
CCA–A
5
6
7
8
9
10µF
10kΩ
–
+
0.33µF –
–
+
1kΩ
0.47µF
16kΩ
11
+
–
1µF
68µF
150Ω
+
0.022µF
16kΩ
+
10
4.7kΩ
Sub
–
+
–
13
Current
Source
Input
–A
10µF
1kΩ
68µF
4700pF
+
–
10µF 560Ω
Output
–A
0.01µF
0.033µF
* 1 Signals of 1kHz, 20mV are applied to the input of the both channels, adjust sinking current into the Pin13 to 15µA±5%
Standard value at VCC=3V is about 1kΩ.
* 2 External circuit should not be connected with the Pin21. Connected in the IC.
* 3 Users should follow the latest technical information from dbx company. Constant number might be changed.
Note 1) All the resistors and the capacitor with the mark should be used in the error less than ±5%.
Note 2) Impedance of the input signal source should be less than 100Ω.
ICs for Cassette, Cassette Deck
AN6291, AN6291S
■ Effect of dbxII Noise Reduction System
(Without noise reduction system)
+20dB
Fortissimo
+10dB
Playback
Output
60 ~ 70dB
Magnetron tape
100dB
Recording
DC range
+10dB
0dB
Input Level
Fortissimo (large sound)
distortes due to magnetron
saturation
Magnetron saturation level Distortes
– 60dB
Z-
– 60dB
Noise level
Pianissimo
Even if input width is
100dB, width 60-70dB is
playbacked in output.
Noise
Pianissimo (small sound)
is erased by the hysnoise
of tape
– 80dB
(When dbx II System is ON)
+10dB
Compressed to
1/2 by dB
Magnetron tape
Recording (Encode)
100dB
Input level
0dB
Expanded to
2 times by dB
– 40dB
o
sim
nis
se
Pia
rea
c
n
I
– 80dB
+20dB
Pian
issim
Dec
o
reas
e–
80d
Noi
B
se l
eve
l
D range is expanded in equal
value as fortissimo is
increased and pianissimo is
decreased its level, and they
are playbacked.
100dB of input range
is playbacked as well
Small sound is playbacked, too.
Noise
Fortissimo is decreased less
than saturation level and
pianissimo is increased
more than noise level. Thus
they are recorded.
Large sound is playbacked
without distortion
Output
Increase
mo
Fortissi
D range
Decre
ase
simo
Fortis
Playback
(Decode)
+20dB
Noise level is decreased more
than by 30dB at the playback
mode (Improvement of S/N
ratio)
■ Cautions
(1) When users use the AN6291 and the AN6291S, contract should be made between the dbx Technology Licensing. dbx
licence and trademark should be contacted with the following.
the U.S.A. : dbx Technology Licensing
JAPAN Office : dbx Technology Licensing
433 California Street, Third Floor
Tel : 03-3378-0915
San Francisco, California 94104
Fax : 03-3374-5191
Tel : 415-765-2801
Fax : 415-765-2141
(2) Capacitor between the Pin6 – 7 and Pin16 –17 is used to cut DC current.
When leakage of DC current is large, encode and decode characteristics is not right value, capacitor's leakage should be as
minimum as possible.
(3) The AN6291 is a low power consumption current type. So effection of wiring resistance is small and oscillation character-ist
of pattern location is good, however, when impedance of the input pin is high, wiring should be shorter because it is easily
effected by external noises.