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CXA1980Q
Dolby B Type Noise Reduction System with Playback Equalizer
Description The CXA1980Q is an IC designed for use in car stereos. Functions include Dolby B type noise reduction (NR), playback equalizer and interval detection between tracks (Music Sensor) into a single chip. Features * Few external parts * Forward/Reverse head switching * Small package (32-pin QFP) * Dolby B type noise reduction and playback equalizer into a single chip * Interval detection level between tracks can be set by external resistors/capacitors (2 modes). Applications * Car stereos * Stereo cassette deck players (playback only) Structure Bipolar silicon monolithic IC 32 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25C) 12 V * Supply voltage VCC * Operating temperature Topr -40 to +85 C * Storage temperature Tstg -65 to +150 C * Allowable power dissipation PD 430 mW Recommended Operating Condition Supply voltage VCC 6.5 to 11
V
These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications information may be obtained. "Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation. Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
--1--
E94913B27
CXA1980Q
Block Diagram and Pin Configuration
LINEOUT1
TAPEIN1
24
23
22
21
20
19
18
17
26
300k
PBRIN1
15 14 13 12 11 10
MS MODE DET
16
NR 300k TAPE 10dB NR LPF DA 300k NR
PBFB1
25
TAPESW
PBOUT1
PBTC1
GND
VCT
TC1
DRSW
NRSW
PBFIN1
27
MSSW
PBGND
28
MODESW
E IREF
29
G1 (FF)
PBFIN2
30
G2 (NOR)
PBRIN2
31
MSTC
32
300k
PBFB2
9
1
PBTC2
MSOUT
2
PBOUT2
3
VCC
4
TAPEIN2
5
D IREF
6
LINEOUT2
7
TC2
8
MSGND
--2--
CXA1980Q
Pin Description Pin No. 1 24 Symbol PBTC DC value -- Z (in) -- Equivalent circuit
(Ta=25C, VCC=8.0V, no signal) Description
VCC
PBEQ capacitance
147
1
24
42
30 GND
2 23 25 32 26 27 30 31 3 4 21
PBOUT PBFB PBIN
2.8V 1.4V 0V
-- 150k 70k
Refer for page 6
PBEQ output PBEQ feed back PBEQ input
VCC TAPEIN
8.0V 4.0V
-- 40k
15
Power supply Tape input
VCC
4
21
147 40k 10P to VGS
GND
5
D IREF
1.25V
--
VCC
Connection of reference current setting resistor for Dolby block
5
147
8k
1.25V
50A GND
--3--
CXA1980Q
Pin No. 6 19
Symbol LINEOUT
DC value 4.0V
Z (in) --
Equivalent circuit
VCC
Description Line output
6
19
147
200 200
GND
7 18
TC
0.3V
--
x2 20k 0.5 6
VCC
Connection of time constant of level detector
0.5
7
147 18 600k GND
9
MSOUT
0.0V for signal detection; 5.0V for no signal detection
--
VDD=5V
VCC
MS output
147
9
10k
GND
10
MSTC
1.4V for signal detection; 5.0V for no signal detection
--
VDD VCC 147 10 1k 50
Connection of MS detection time constant
GND
11 12
G2(NOR) G1(FF)
4.0V
--
10
VCC
MS feed back
11 147 12
100k
100 GND
--4--
CXA1980Q
Pin No. 13 15 16 17
Symbol MODESW NRSW DRSW TAPESW
DC value --
Z (in) --
Equivalent circuit
VCC 50 147 13 15 16 17 GND VCC 50 147 14 50
Description Refer to page 6
14
MSSW
--
--
Refer to page 6
GND
20
VCT
4.0V
--
30k
VCC 50 45k 20 147 to VGS 30k GND
VCC/2 output
22 8 28 29
GND MSGND PBGND E IREF
0.0V
--
Ground
1.25V
--
VCC
Connection of reference current setting resistor for PBEQ block.
147 29
1.25V
10 GND
--5--
CXA1980Q
* PBOUT, PBFB, PBIN equivalent circuit
VCC VREG
1k OUT 147
300k FB 1k
147
25P IN 147 300k 70k GND
* Description for SW pins MODESW -- Switching of MS signal detection/blank detection High: G1 (signal detection); Low: G2 (blank detection) NRSW -- Switching of Dolby B type noise reduction ON/OFF High: noise reduction OFF; Low: Dolby B DRSW -- Switching of tape rotation High: reverse; Low: forward TAPESW -- Switching of HIGH/NORMAL tape High: NORMAL tape; Low: HIGH tape MSSW -- Switching of MS ON/OFF High: MS ON; Low: MS OFF
--6--
CXA1980Q
Electrical Characteristics (Ta=25C, VCC=8.0V, RL: output load resistance, Rg: head equivalent impedance)
Item Current consumption Symbol ICC No signal Measurement conditions (input pin, input level, frequency etc.) 9.0 12.4 16.0 mA Min. Typ. Max. Unit
Dolby block (Dolby level -6dBm=0dB) TAPE IN input sensitivity Decode boost 1 Decode boost 2 Decode boost 3 Decode boost 4 Decode boost 5 VTIN BP1 BP2 BP3 BP4 BP5 LINEOUT= 0 dB 1kHz TAPE IN 500Hz NR-ON Vlo=-25dB TAPE IN 2kHz NR-ON Vlo=-25dB TAPE IN 5kHz NR-ON Vlo=-25dB TAPE IN 10kHz NR-ON Vlo=-40dB TAPE IN 10kHz NR-ON Vlo=0dB TAPE IN -20dBm 1kHz RL=2.7k TAPE IN -20dBm 1kHz NR-ON RL=2.7k No signal NR-ON CCIR/ARM filter 1kHz THD=1% RL=2.7k TAPE IN -24dBm 1kHz No signal -32.0 1.4 5.5 3.9 9.7 -1.1 -- -- 77.0 13.0 -- 3.9 -30.0 2.9 6.4 5.2 10.4 0.4 0.03 0.04 82.8 14.4 -67 4.0 -28.0 4.4 8.5 6.9 11.9 1.9 0.2 0.2 -- -- -55 4.1 V dB % dB dBm
TAPEIN total harmonic distortion 1 THD1 TAPEIN total harmonic distortion 2 THD2 Decode S/N ratio Signal handling Cross talk TAPE 1ch2ch LINEOUT offset voltage Playback equalizer amplifier block 120s FWD frequency characteristics PBREF 120s FWD frequency characteristics F120F 70s FWD frequency characteristics F70F SN1 VOMAX1 CT Vos1
PB F IN 315Hz -70dBm VPBO=0dB PB F IN 2.7kHz -58.5dBm for 315Hz PB F IN 4.5kHz -53.8dBm for 315Hz PB R IN 315Hz -70dBm for 315Hz PB F IN 1kHz THD=1% RL=2.7k PB F IN 1kHz -52dBm RL=2.7k No signal "A" weighting filter No signal Rg=2.2k PB IN 1kHz -42dBm
-27.0 -1.5 -1.0 -10.0 -- 55.0 2.4
-25.0 0.0 0.0 -3.0 0.07 58.0 2.8 -78 -71
-23.0 1.5
dBm
dB 1.0 -- 0.5 -- 3.2 -70 -65 dBm % dB V dB
120s RVS frequency characteristics F120R Signal handling Total harmonic distortion S/N ratio Output offset voltage Cross talk between channels VOMAX2 THD5 SN2 Vos2 CT4
Cross talk between RVS and FWD CT5 Interval detection between tracks (MUSIC SENSOR) block Signal detection level 1 Signal detection level 2 MS output leak current MS output saturation voltage Logic voltage VMS1 VMS2 IOH VOL VIL VIH TAPE IN 5kHz MS-ON G1 (10k, 0.015F) TAPE IN 5kHz MS ON G2 (1k, 1.5F) TAPE IN 5kHz -10dBm, 5V applied to MSOUT TAPE IN 5kHz -30dBm, 1mA applied to MSOUT AUXSW, MODESW, INSW, MSSW, TAPESW, NRSW, DRSW -44.3 -63.5 -- -- 0.0 2.5
-39.3 -58.5 0.0 0.28 -- --
-33.0 -53.5 1.0 1.0 0.5 VCC
dBm A
V
120s, FWD mode, NR OFF, MS OFF unless otherwise specified.
--7--
CXA1980Q
Operation mode control (TAPESW, DRSW, NRSW, MSSW, MODESW) The CXA1980Q has built in electronic switch circuits and the operations are controlled by the direct current applied to each SW pin. The operation mode state for each switch is shown in the table below. SW TAPESW DRSW NRSW MSSW MODESW Function for Low input 70S PB FWD DOLBY B NR MS OFF G2(NOR) MODE Function for High input 120s PB RVS NR OFF MS ON G1(FF) MODE
Click noise can be reduced by the external CR time constant circuit for NR SW switching.
--8--
Electrical Characteristic Measurement Circuit
R43 R42 R41 R40 S16 10k 100 10k 100 0dB or 30dB Amp S17 S18 S19 DC Voltmeter
138.5k
R19
R17 C13 S7 5.1k 1 C18
2.2 C24 2.7k S13
R44
50k S26
S5
R30
C2 R13 R14
2.7k
0.1
10 C29
C10
33 270 C8
PBOUT1
TAPEIN1
LINEOUT1
TAPESW
10n 25
PBTC1
24
23
1
22
21
20
19
18
17
V3
GND
VCT
TC1
1.2k R2
1.2k
R1
Audio SG
R10 R6 19.2k R5 19.2k S2 S1 2.2k C6 R9 4.7 2.2k C5 4.7
V5
PBFB1 PBRIN1 PBFIN1 PBGND
16
DRSW NRSW MSSW
V4
26
V7
Power Supply VCC
27
14
V6
GND
15
28
MODESW CXA1980Q G1(FF) G2(NOR) MSTC
13
29
E IREF PBFIN2 PBRIN2
GND
R4 19.2k R3 19.2k
30
31
LINEOUT2
10
4.7 R8 S4 2.2k C3 R7 2.2k 4.7
11
S3
15k C3
12
R15
1MEG
0.1 R33
C25
TAPEIN2
PBOUT2
D IREF
MSGND
PBFB2
32
PBTC2
270 33 C7
10n
TC2
VCC
9
R12 C1
1
2
3
4
10 R16 5.1k C12 1
5
C19
6
2.2 2.7k
7
8
DC Ammeter
A
2.7k
R11
R28
18k
0.1
S14 C23
C9
1
S15
180k
R45
C11
183.5k
R18
S8
R29
S6
GND
OFF : 0dB ON : 30dB GND
GND
S28
S29 "A" WTG
S30 DIN Audio
--9--
R32 C27 10k 0.015 R31 C26 1k 1.5 R39 10K R38 100 S31 1kHz BPF
S20 S32 S21 CCIR
MSOUT
AC Voltmeter
Distortion Analyzer
R37 R36 R35 R34
10k 10k 100 100
S22 S23 S24 S25
Oscillo -scope
CXA1980Q
Application Circuit
0.22
2.2 C15
C12
10
R4 1k
C4 10n
C6
LINEOUT1 C13
TAPEIN1
0.1 TAPESW
PBOUT1
PBTC1
GND
VCT
16
TC1
C2
H : TAPE, L : AUX
TO MICROCOMPUTER
24
23
22
21
20
19
18
17 DRSW VDD H : RVS, L : FWD NRSW R11
25
PB HEAD REV1
26
300k
PBFB1
22
PBRIN1
C20
300k
NR
15
16
22k
H : OFF, L : DOLBY B
27
FWD1
PBFIN1
MS NR 10dB LPF
14
MSSW H : MSON, L : MSOFF MODESW (H : G1, L : G2) G1 (FF) R10 C19
28
PBGND
TAPE
MODE
R5
29
15k RVS2
E IREF
DA
12
13
30
PBFIN2
11
31
32
PBFB2
9
MSOUT
1MEG 100k R7
300k
16
C1
1
PBTC2
2
PBOUT2 8V
3
VCC 10
4
TAPEIN2
5
D IREF
6
2.2 LINEOUT2 C16
7
TC2
8
MSGND
R3 1k
10n C3
C5
C7
18k C14
0.1
R6
0.1 R8
FWD2
NR
C17
PBRIN2
DET
10
--10--
10k 0.015 G2 (NOR) R9 1k C18 1.5 L : SIGNAL EXIST H : NO SIGNAL
300k
MSTC
CXA1980Q
0.22
Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party and other right due to same.
CXA1980Q
Description of Operation (1) Signal route
Dolby level (-30dBm) PBOUT TAPEIN (-6dBm) LINEOUT
PBFB PBTC
Op1
Op2
4dB
NR
20dB TAPE AUX 20dB
PBIN F R
Fig. 1 Op1 and Op2 are operational amplifiers. Op1 compose the playback equalizer by attaching a resistor and a capacitor to PBFB pin, and a capacitor to PBTC pin. Op2 is an input selector and a LINEOUT amplifier. The gain of LINEOUT amplifier is 24 dB. Reference input level for Dolby is -30 dBm. The adjustment method of playback equalizer is described in the paragraph (3). (2) Level diagram
P B I N P B O U T T A P E I N L I N E O U T
0dBm -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -70dBm VR adjustment -30dBm -30dBm
-6dBm Dolby level
Fig. 2 --11--
CXA1980Q
(3) Adjustment of playback equalizer
2 R1 C2 C1 3 PBFB PBTC Ri PBOUT 1 G2 G3 2 fc 3
G1
300k
300k
Fig. 4
PBIN F R E IREF 1 R4
Fig. 3
1
2
3
Adjustment of EQ curve gain difference (= adjustment of internal variable R) E IREF resistor The internal variable resistor Ri should be adjusted to adjust the EQ curve gain differences (G1-G2), (G1-G3). Therefore, adjust the external resistor R4 for E IREF pin. AC gain adjustment External resistor R1 The external resistor R1 should be adjusted to adjust the AC gain. G1 are obtained by the following equations. R1+300k G1=20log (dB) R1 [AC gain can be also adjusted by attaching VR to PBOUT pin, fixing R1. However, the low-band cutoff frequency can be more lowered by R1 adjustment method with the same C1 value used for this method.] Low-band cut-off frequency External resistor R1 and external capacitor C1 The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor C1.
--12--
CXA1980Q
(4) MS (interval detection between tracks) adjustment method
2 NOR (BS) G1 G2 FF (AMS) 2 MSTC 1 1
25kHz LPF TAPEIN 10dB DET MSOUT
100k
G1 2 1 R1 C1
G2 1 R2 C2 2
Fig. 5 1 MS gain (G1/G2 mode gain) adjustment External resistors R1, R2 MS gain is expressed by the following equations. R1+100k R2+100k G1=10+20log (dB) G2=10+20log (dB) R1 R2 MS cut-off frequency adjustment External resistors R1, R2 and external capacitors C1, C2 The external resistors R1, R2 and external capacitors C1, C2 should be adjusted to adjust the lowband cut-off frequency of MS frequency characteristics.
2
--13--
CXA1980Q
Characteristics Graphs
Current consumption vs. Supply voltage Ta=25C VCC=8.0V NR OFF, MS OFF Output level 25dBm constant Playback equalizer frequency characteristics Ta=25C
For no signal NR OFF, MS OFF
60
Gain [dB]
50
12.5
Current consumption [mA]
40 120s 30 70s
12.0
50
100
1k Frequency [Hz]
10k
OUT 300k 11.5 0.01 33 270
7.0
8.0
9.0
10.0
11.0
12.0
Supply voltage [V]
Decode boost frequency characteristics Ta=25C VCC=8.0V 0dB=Dolby Level -40dB
10
8
Decode boost [dB]
-30dB 6
4
-20dB
2
-10dB
0 100 1k Frequency [Hz]
0dB 10k
--14--
CXA1980Q
Total harmonic distortion (pre-amplifier block) Ta=25C Input : PBFIN1 Output : PBOUT1 VCC=8.0V
Total harmonic distortion (Dolby block) Ta=25C Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level
101
100
f=10kHz
Distortion [%]
100 f=1kHz
Distortion [%]
NR OFF f=1kHz 10-1
NR ON f=100Hz
NR ON f=10kHz
f=100Hz 10-1 10-2 NR ON f=1kHz
-24
-20
-16
-12
-8
-4
0
-6
-2
2
6
10
14
Output level [dBm]
Output level [dBm]
Ripple elimination ratio (PBOUT) 0 VCC=8.0V RL=2.7k -10 -10 Ta=25C 0
Ripple elimination ratio (LINEOUT) Ta=25C VCC=8.0V
-20
-20
Ripple elilmination ratio [dB]
-30
Ripple elilmination ratio [dB]
-30 NR OFF -40 NR ON -50
-40
-50
-60
-60
-70 100 1k Frequency [Hz] 10k
-70 100 1k Frequency [Hz] 10k
--15--
CXA1980Q
Cross talk between channels (1ch 2ch) -20 VCC=8.0V Input : PBFIN1 Output : LINEOUT1
Ta=25C
-30
Cross talk [dB]
-40
-50
-60
-70 20 100 1k Frequency [Hz] 10k
Blank detection level frequency characteristics Ta=25C -10 -20 VCC=8.0V Ta=25C Input : TAPEIN1
Input level [dBm]
-30 HPF gain 20dB -40 -50 -60 20 100 1k Frequency [Hz] 10k MS block gain vs. Blank detection level Ta=25C VCC=8.0V Ta=25C Input : TAPEIN1 f=1kHz
HPF gain 40dB
-30
-40
Input level [dBm]
-50
-60
-70 10 20 30 40 HPF gain [dB] 50 60
--16--
CXA1980Q
Package Outline
Unit : mm
32PIN QFP (PLASTIC)
9.0 0.2 + 0.3 7.0 - 0.1 24 17 + 0.35 1.5 - 0.15 0.1
25
16
A
32
9
+ 0.2 0.1 - 0.1
1 0.8 b
8 0.24 M 0 to 10
+ 0.15 b = 0.30 - 0.10 ( 0.30)
DETAIL A : SOLDER
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE QFP-32P-L01 P-QFP32-7x7-0.8 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER PLATING 42 / COPPER ALLOY 0.2g
32PIN QFP (PLASTIC)
9.0 0.2 + 0.3 7.0 - 0.1 24 17 + 0.35 1.5 - 0.15 0.1
25
16
(0.127)
+ 0.10 0.127 - 0.05
A
32
9
+ 0.2 0.1 - 0.1
1 0.8 b
8 0.24 M 0 to 10
+ 0.15 b = 0.30 - 0.10 ( 0.30)
DETAIL A : SOLDER
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE QFP-32P-L01 P-QFP32-7x7-0.8 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER PLATING 42 / COPPER ALLOY 0.2g
LEAD PLATING SPECIFICATIONS ITEM LEAD MATERIAL SOLDER COMPOSITION PLATING THICKNESS SPEC. 42 ALLOY Sn-Bi Bi:1-4wt% 5-18m
(0.127)
+ 0.10 0.127 - 0.05
0.50
(8.0)
0.50
(8.0)
--17--
Sony Corporation

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