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ICs for Cassette, Cassette Deck
AN6291, AN6291S
Dual dbx II Noise Reduction System ICs
s Overview
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.
AN6291
1 2 3 4 5 6 7 8 9 10 11 8.60.3 26.70.3 22 21 20 19 18 17 16 15 14 13 12 Unit : mm 0.50.1 4.70.25
0.35 - 0
+ 0.1 .05
s 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 :
VCC (opr) =1.8V to 14V
1.00.25 3.30.25
3 ~15
10.160.25
22-Lead DIP Package (DIP022-P-0400A)
AN6291S
1.09
0.10.1
1 2 3 4 5 6 7 8 9 10 11
22 21 20 19 18 17 16 15 14 13 12
0.40.25
2.54 Unit : mm 0.15 0.925 2.00.2 15.30.3
1.27
0.3 7.20.3 9.40.3
22-Lead SOP Package (SOP022-P-0375)
1.20.25
AN6291, AN6291S
s Block Diagram
VCC 22 NC 21 VCC
-
OP Amp.
ICs for Cassette, Cassette Deck
RMS IN-B 20
TIMING -B 19
CCA IN-B 18
CAP 1-B 17
CAP 2-B 16
VOUT- B 15
ON - OFF -B I TIME ENCODE 14 13 12
RMS
CCA
+
Current Source Timing Current
Logic
+
RMS
CCA
OP Amp.
-
Bias GND SUB 1 ADJ 2 GND 3 RMS IN- A 4 TIMING -A 5 CCA IN- A 6 CAP 1- A 7 CAP 2- A 8 VOUT- A 9 ON - OFF -A 10 N.I. 11 DECODE
s Pin Descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 GND RMS IN-A TIMING-A CCA IN-A CAP-1-A CAP-2-A VOUT-A ON-OFF-A N.I. DECODE Pin Name Adjustment of timing current Pin No. 12 13 14 15 16 17 18 19 20 21 22 ENCODE I TIME ON-OFF-B VOUT-B CAP-2-B CAP-1-B CCA IN-B TIMING-B RMS IN-B NC VCC Pin Name
ICs for Cassette, Cassette Deck
s Absolute Maximum Ratings (Ta=25C)
Parameter Supply Voltage Supply Current Power Dissipation (Ta=75C) Operating Ambient Temperature Storage Temperature AN6291 AN6291S Symbol VCC ICC PD Topr Tstg Tstg Rating 14.4 5 100 -20 ~ + 75 -55 ~ + 125 -40 ~ + 125
AN6291, AN6291S
Unit V mA mW C C C
s Electrical Characteristics (VCC=3V, Ta=25C)
Parameter Input/Output Characteristics/ENCODE Mode Symbol VOE -1 VOE -2 VOE -3 VOD -1 Input/Output Characteristics/DECODE Mode ENCODE Mode DECODE Mode ENCODE Mode DECODE Mode ENCODE Mode DECODE Mode VOD -2 VOD -3 Maximum Output Voltage VOME VOMD THDD VNOE VNOD CDE CDD CT SVRR ICC VOFF THDOFF VnOFF Condition VIN = + 20dB, f=1kHz VIN = 0dB, f=1kHz VIN= -40dB, f=1kHz VIN = + 10dB, f=1kHz VIN=0dB, f=1kHz VIN= -20dB, f=1kHz THD=1%, f=1kHz VO = + 14dB, f=1kHz Input Short A-weight 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 -1.2 -1.2 50 40 17 min. 7.5 -2 -23 17 -2 -44 80 200 typ. 10 0 -20 20 0 -40 150 450 0.15 100 3 0 0 60 55 1.8 20 0.3 10 3.2 23 1 20 0.3 200 6 1.2 1.2 max. 12.5 +2 -17 23 +2 -36 mV % V dB dB dB mA dB % V dB dB Unit
Total Harmonic Distortion/DECODE Mode Noise Output Voltage Difference Between Channels
Crosstalk/ENCODE Mode Ripple Rejection Ratio/DECODE Mode Quiescent Current Input/Output Characteristics/dbx OFF Mode Total Harmonic Distortion/dbx OFF Mode Output Noise Voltage/dbx OFF Mode Note) 0dB= 20mV= -34dBV
AN6291, AN6291S
ICs for Cassette, Cassette Deck
VOUT, Vno- f (Encoder mode)
Output Noise Voltage Vno, Output Voltage VOUT (dB) Output Noise Voltage Vno, Output Voltage VOUT (dB) +20 0 -20 VOUT -40 -60 -80 Vno -100 -120 -140 20 100 1k Frequency f (Hz) 10k 20k VCC= 3V Vin= - 34dBV +20 0 -20 -40 -60 -80 -100 -120 -140
VOUT, Vno- f (Decoder mode)
VCC= 3V Vin= -34dBV Total Harmonic Distortion THD (%) 2.0
THD - f (Encoder mode)
VCC= 3V Vin= - 34dBV
VOUT
1.5
1.0
0.5
Vno 0 20 100 1k Frequency f (Hz) 10k 20k 20 100 1k Frequency f (Hz) 10k 20k
THD - f (Decoder mode)
2.0 VCC = 3V Vin= - 34dBV
VOUT, THD -VIN (Encoder mode)
-10 VCC= 3V f= 1kHz -20 Output Voltage VOUT (dBV) Output Voltage VOUT (dBV)
OU T
VOUT, THD-VIN (Decoder mode)
-0 VCC= 3V f= 1kHz
Total Harmonic Distortion THD (%)
1.5
-20 Total Harmonic Distortion THD (%) 2.0
V
T
Total Harmonic Distortion THD (%)
-30
V
2.0
-40
1.0
-40
1.5
OU
1.5 -60 1.0 -80 0.5 THD -100 0 -70 -60 -50 -40 -30 -20 Input Voltage VIN (dBV)
-50 THD -60
1.0
0.5
0.5
0 20 100 1k Frequency f (Hz) 10k 20k
-70 -100
-80
-60
-40
-20
0
0 +20
Input Voltage VIN (dBV)
ICs for Cassette, Cassette Deck
s Application Circuits
1 Switching circuit of recording/playback
AN6291, AN6291S
+VCC Input -B 0.1F
33k
D
E SW1a
3.3k
0.1F D E SW1b
15k 330
2700pF
-
+
10F + -
560
OFF ON 0.01F
SW2a Output -B
0.0033F
0.0033F
330pF
+ 0.47F - 0.033F
270k
6800pF 15k -
6800pF 22F - + 15k -
10F
1k SW1e +
10k
0.1F 4.7k 33k 6.8k
150k 2SC1327
51k 10F
1k
+
D
E
*2
22
21
20
19
18
17
16
15
14
13
12
RMS- B Current Source RMS - A SUB 1 *1 2k (B) 2 3 4
CCA- B
OP Amp.- B Logic
CCA- A
OP Amp.- A 7 8 9 10 + - + 51k 15k - 6800pF 1F 11
5
6
+ - 10k 1k 0.033F - + 3.3k D - + 0.47F 6800pF SW1e E 15k 10F
22F
2SC1327 1F 4.7k 33k 6.8k 0.0033F 0.0033F 330pF 270k
150k
330 2700 pF 51k
+
- 560 0.01F OFF
ON SW2b
Output -A
10F
33k 0.1F D Input -A SW1d E
0.1F
Logical condition of recording/playback Pin11 VCC Open VCC Pin12 Open VCC VCC Mode DECODE ENCODE 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 15A5%. Standard value at VCC=3V is about 1k. * 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).
AN6291, AN6291S
2 Playback exclusive circuit (Designed noise at dbx OFF mode to be small)
ICs for Cassette, Cassette Deck
+VCC
0.033F 1k Input -B 0.47F - + 10k
4700pF 150 68F - 16k 20 19 18 17 16 15 + 16k
10F + -
560
0.01 F 1k
Output -B
+ *2 NC 22 21
+
4.7k 14 13
+ -
10F
10F
-
-
0.33F
0.022F
dbx ON- OFF Open "ON"
(
)
12
RMS- B Current Source RMS-A
CCA- B
OP Amp.- B Logic OP Amp.- A
Sub
CCA-A
1 *1 2k (B)
2
3
4
5 16k
6
7
8
9 4.7k
10
11
0.022F
+ - 1F
10F 10k Input -A - + 1k
+ -
+ 0.33F - -
+ 68F
16k
150 4700pF 0.033F
+
- 0.01F
0.47F
10F 560
Output -A
* 1 Signals of 1kHz, 20mV are applied to the input of the both channels, adjust sinking current into the Pin13 to 15A5% Standard value at VCC=3V is about 1k. * 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 100.
ICs for Cassette, Cassette Deck
s Effect of dbxII Noise Reduction System
(Without noise reduction system)
+20dB Fortissimo +10dB 0dB Magnetron tape Input Level 60 ~ 70dB Recording Playback Magnetron saturation level Distortes +10dB DC range Output
AN6291, AN6291S
Fortissimo (large sound) distortes due to magnetron saturation
Even if input width is 100dB, width 60-70dB is playbacked in output. Z-
100dB
- 60dB - 60dB Pianissimo - 80dB Noise level Noise
Pianissimo (small sound) is erased by the hysnoise of tape
(When dbx II System is ON)
+20dB
Fortis
Recording (Encode) 0dB 100dB Input level
Decre ase simo
+10dB Magnetron tape Compressed to 1/2 by dB
Increase mo Fortissi
Playback (Decode)
+20dB
Large sound is playbacked without distortion
Expanded to 2 times by dB D range
Output
100dB of input range is playbacked as well
- 40dB
Pian issim Dec o reas e- 80d Noi B se l eve l
o sim e nis eas Pia ncr I
- 80dB
Small sound is playbacked, too. Noise level is decreased more than by 30dB at the playback mode (Improvement of S/N ratio)
Noise Fortissimo is decreased less than saturation level and pianissimo is increased more than noise level. Thus they are recorded. D range is expanded in equal value as fortissimo is increased and pianissimo is decreased its level, and they are playbacked.
s 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.

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