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CXA1910Q
Dolby B Type Noise Reduction System with Playback Equalizer
For the availability of this product, please contact the sales office.
Description The CXA1910Q is an IC designed for use in car stereos. Functions include Dolby B type noise reduction, playback equalizer amplifier and Music sensor into a single chip. Features * Few external parts * Forward/Reverse head switching * Small package (40-pin QFP) * Dolby B type noise reduction and playback equalizer into a single chip * Same pin configuration as Dolby B/C type noise reduction system (CXA1911) * Music sense level can be set by external resistors/capacitors (2 modes). * High-band cut filter frequency can be adjusted by the external capacitance. Applications * Car stereos * Stereo cassette deck players (playback only) Structure Bipolar silicon monolithic IC 40 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25C) * Supply voltage VCC 12 V * 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--
E93Z04-TE
CXA1910Q
Block Diagram and Pin Configuration
TAPEIN1
LINEOUT1
PBOUT1
GND
VCT
30
29
28
27
26
25
24
23
TC1
22
NC
NRSW
21
NC
NC1
NC PBTC1
32 31 20
PBFB1 PBRIN1 PBFIN1 PBGND E IREF
37 36 34 33
NR
300k F/R
19 18
NR OFF
NR ON
TAPESW DRSW NRMODE
17
IN A UX TA PE DR NR
MSSW
16
35
MSMODE
MS
MODE
15
G1 (FF)
PBFIN2
38
F/R
10dB
300k
LPF
G1/G2
13
14
G2 (NOR) MSTC MSOUT
11
PBRIN2 PBFB2
NR OFF
39
NR ON
PBTC2
40
1
2
3
4
5
6
7
8
9
10
LINEOUT2
TAPEIN2
PBOUT2
MSLPF
D IREF
NC2
TC2
Vcc
--2--
MSGND
NC
12
NR
DET
CXA1910Q
Pin Description Pin No. 1 30 32 39 33 34 37 38 2 10 29 35 31 40 Symbol PBOUT PBFB PBIN DC value 2.1V 2.1V 0V Z (in) -- 300k -- Equivalent circuit Refer to Page 6.
(Ta=25C, VCC=8.0V, no signal) Description PBEQ output PBEQ feedback PBEQ input
VCC MSGND GND PBGND PBTC
8.0V 0.0V
-- --
Power supply Ground
--
--
Vcc
PBEQ capacitance
147 31 40
42
30 GND
36
E IREF
1.25V
--
Vcc
Reference current setting resistor pin
147 36 10
1.25V
GND
11
MSOUT
0.0V for signal detection; 5.0V for no signal detection
--
VDD=5V
Vcc
MS output
147 11 20k
GND
--3--
CXA1910Q
Pin No. 12
Symbol MSTC
DC value
Approx. 1.4V for signal detection; 5.0V for no signal detection
Z (in) --
VDD=5V
Equivalent circuit
Description Connection of MS detection time constant
Vcc 147 12 1k 50
GND
13 14
G2(NOR) G1(FF)
4.0V
--
10
Vcc
MS feedback
147 13 14
100k
100 GND
3 28
TAPEIN
4.0V
40k
Vcc 15
TAPE input
3
28
147 40k to VGS
GND Vcc
6
D IREF
1.25V
--
Connection of reference current setting resistor for Dolby block
147
8k
6
1.25V
50 GND
7 24
LINEOUT
4.0V
--
Vcc
Line output
7
24
147
200 200
GND
--4--
CXA1910Q
Pin No. 9 22
Symbol TC
DC value 0.3V
Z (in) --
Equivalent circuit
Vcc x2 0.5 20k 6 0.5
Description Time Constant pin for the level detector
9
147 22 600k GND
15 17 18 19 21
MSMODE NRMODE DRSW TAPESW NRSW
--
--
15 17 147 18 19 21
Vcc 50
Refer to Page 6.
GND
16
MSSW
--
--
50 147 16
Vcc 50
Refer to Page 6.
GND
25
VCT
4.0V
--
30k
Vcc 50 45k 25 147 to VGS 30k GND
VCC/2 output
4 8 20 23 26 27 5
NC
--
--
No connection.
MSLPF
4.0V
100k
100 k
VCC
Capacitance connection for adjusting the MS LPF time constant.
5
147 64p GND
--5--
CXA1910Q
* PBOUT, PBFB, PBIN equivalent circuit
Vcc
VREG
PBOUT 147
500
1
30 PBFB 32 39 500 300k 10p
PBIN 33 34 37 38
600
GND
Description for SW pins MSMODE - Switching of MS signal detection/blank detection High: G1; Low: G2 NRSW Switching of Dolby B type noise reduction ON/OFF High: noise reduction ON; Low: noise reduction OFF DRSW Switching of tape direction High: reverse; Low: forward TAPESW - Switching of HIGH/NORMAL tape High: NORMAL tape; Low: HIGH tape NRMODE - Switching of noise reduction modes High: noise reduction OFF; Low: Dolby B MSSW Switching of MS ON/OFF High: MS ON; Low: MS OFF
--6--
CXA1910Q
Electrical Characteristics (Ta=25C, Vcc=8.0V, RL: output load resistance, Rg: head equivalent impedance)
Measurement conditions Item Current consumption Symbol (input pin, input level, frequency etc.) ICC No signal 14.5 17.9 21.5 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 TAPE IN total harmonic distortion 1 TAPE IN total harmonic distortion 2 Decode S/N ratio Signal handling Cross talk TAPE 1ch2ch LINEOUT offset voltage VTIN BP1 BP2 BP3 BP4 BP5 THD1 THD2 SN1 VOMAX1 CT3 VOS1 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 -- -- dB -55 4.1 V dB dB dBm
Playback equalizer amplifier block
120s FWD frequency characteristics 120s FWD frequency characteristics 70s FWD frequency characteristics 120s RVS frequency characteristics Signal handling Total harmonic distortion S/N ratio Output offset voltage Cross talk between channels Cross talk between RVS and FWD PBREF F120F F70F F120R VOMAX2 THD5 SN2 VOS2 CT4 CT5 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 -1.5 -1.0 -10.0 -- 57.0 1.55 -- -- -25.0 0.7 0.0 0.0 -3.0 0.07 60.0 1.95 -78 -75 -23.0 1.5 1.5 1.0 -- 0.5 -- 2.35 -70 dB -65 dBm % dB V dB dBm
Interval detection between tracks (MUSIC SENSOR) block
Signal detection level 1 Signal detection level 2 MS output leak current MS output saturation voltage VMS1 VMS2 IOH TAPE IN 5kHz -30dBm, 1mA applied to MSOUT VOL AMS ON (G1 mode) -- 0.28 1.0 V TAPE IN 5kHz MS-ON G1 (10k, 0.015F) TAPE IN 5kHz MS-ON G2 (1k, 1.5F) -43.0 -62.5 -- -39.0 -58.5 0.0 -35.0 dBm -54.5 1.0 A
Boost charge circuit block
PBFB boost-charge current Boost charge ON VCT level Boost charge OFF VCT level Logic voltage VIH TAPESW, NRSW, DRSW 2.5 -- Vcc ICRG VCRG1 VCRG2 VIL No signal, 3.4V applied to VCT and 1.8V to PBFB No signal, VCT level when boost charge ON No signal, VCT level when boost charge OFF MSMODE, NRMODE, MSSW, 1.0 -- 3.6 0.0 3.0 -- -- -- -- 3.4 -- V 0.8 mA
120s, FWD mode, NR OFF, MS OFF unless otherwise specified.
--7--
Electrical Characteristics Measurement Circuit
R35 10K R34 100 R33 10K R32 100 R19 138.5k S19 S18 S17 S16
DC Voltmeter
0dB or 30dB
Amp
R17 5.1k S13 S7 R26 50k 2.7k S26
1
1
C13
C10
R14
2.7k
C22
0.1
+ V5
+ GND
C18
+
10 C20
+
2.2 R22
C24
0.1
S7
OFF : 0dB ON : 30dB
GND
30 27
NC NC VCT NC1 TC1 NRSW
NC
29 28 26 21 25 24
GND
23
22
R13
S28
C7
Audio SG
10n +
31
R1
PBOUT1
1.2k R2
1.2k
33m 270 C13
TAPEIN1
LINEOUT1
PBTC1
20
S29 V4
R10 +
32
33
18
R6 S1 2.2k 4.7 C5
C8
PBFB1 PBRIN1 DRSW
V3 V2
TAPESW
GND +
34
17
Power Supply
S2 R9 4.7
19.2k R5
19
"A" WTG
19.2k
35
16
Vcc 2.2k R15
PBFIN1 NAMODE PBGND
S30
DIN Audio
V1
36
CXA1910Q
MSSW
R8 15k C4 +
15
37
4.7 +
14
38
19.2k 4.7
R7
13
39
12
C7
10n
C25
40
R12 C1
270 33
11
1MEG
+
0.1 R25
MSLPF
D IREF
LINEOUT2
PBOUT2
Vcc
TAPEIN2
NC
NC2 TC2
MSGND
R45
R11
2.7k
1
10
S44 10 C9 C12 1 R20 10k S6 10 S8 0.1 R21 2.7k C23 C16 + C19 2.2 + + +
2
3
4
5
6
7
8
9
DC Ammeter
A
C11
0.1
S15
100k
R16
R18
5.1k
138.5k
S14
+
--8--
S3 2.2k R24 + 10k R23 + 1k 1.5 0.015 C26 C27 C3
GND S4
R4
E IREF MSMODE G1(FF) G2(NOR) MSTC PBFIN2 PBRIN2 PBFB2 PBTC2 MSOUT
V7 S31
1kHz BPF
19.2k R3
2.2k
R31 S20 S32 10k R30 S21 100
CCIR
AC Voltmeter
Distortion Analyzer
R29 10 k R28 10 k R27 100 R26 100 S22 S23 S24 S25
Oscillo -scope
CXA1910Q
Application Circuit
2.2
C15
0.22
0.1
C6
C12 10
GND
TAPEIN1
NC
LINEOUT1 C13
PBOUT1
NC
VCT
NC1
TC1
NRSW
H : NR ON, L: NR OFF TO MICROCOMPUTER NC
20
30
29
28
27
26
25
24
23
22
21
C2
PB HEAD TAPESW
19 32
300k
1k 10n PBFB1 NR
18 33
PBTC1 TAPE/AUX NR OFF NR ON H : 120s, L : 70s DRSW H : RVS, L : FWD NRMODE H : OFF, L : DOLBY B MSSW H : MSON, L : MSOFF MSMODE G1 G2 G1/G2 G1/G2 DET DET
13
REV1 PBRIN1 PBFIN1
35 34 17
16
31
R4
C4
RADIO/CD
VDD
300k 300k AUX AUX
16 15
IN IN
FWD1
TAPE TAPE
PBGND
36
MSSW DR DR MS
R5 E IREF PBFIN2 PBRIN2 NR NR OFF NR ON TAPE/AUX RADIO/CD
39 38 37
300k 300k
10dB
10dB
LPF
14
C1
C17
0.1
40
10n
MSOUT 7 8 9
10
R8 R7 NC2 TC2
1k 1 2 3 4 5 6
PBTC2
11
1MEG C16 0.1 MSGND
R3 C3
16
PBFB2
300k
12
Vcc
PBOUT2
8V
C5 10
TAPEIN2
NC
C20
C7 0.22
CXA1910Q
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.
150P MSLPF R6 D IREF 18k C14 LINEOUT2
2.2
100k
--9--
MS
MODE MODE NR NR
15k
FWD2
R10
(H : G1, L : G2) C19 10k 0.015 C18 R9 MSTC 1k 1.5 L : SIGNAL EXIST H : NO SIGNAL
LPF
RVS2
Application Circuit
2.2 C20 68n
C15
0.1
C6 0.22
C12 10
PBOUT1
NC
VCT
TCL1
GND
TAPEIN1
NC
LINEOUT1 C13
TCH1
NRSW
H : NR ON, L: NR OFF TO MICROCOMPUTER NC
20
30
29
28
27
26
25
24
23
22
21
C2
PB HEAD
32
1k 10n
PBTC1
31
R4 TAPE/AUX NR OFF NR ON
19
C4
RADIO/CD TAPESW H : 120s, L : 70s DRSW H : RVS, L : FWD NRMODE H : OFF, L : DOLBY B
VDD
PBRIN1 PBFIN1 PBGND MSSW
36 35 16 34
33
300k 300k AUX AUX TAPE TAPE DR DR
17 18
REV1 IN IN
FWD1
16
PBFB1 NR
R5 E IREF PBFIN2
38 37 14
300k
RVS2 NR DET DET NR OFF NR ON TAPE/AUX RADIO/CD
39
PBRIN2 PBFB2
40
G1/G2 G1/G2
13
C1
C17
0.1
R8
MSOUT
1k 1 2 3 4 5 6 7
C3 PBTC2 10n
11
R7
8 9
10
1MEG TCH2 C16 0.1 MSGND
R3
16
300k
12
Vcc
NC
PBOUT2
8V
C5 10
TAPEIN2
C20
150P MSLPF R6
C7 0.22
CXA1910Q
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.
D IREF 20k C14 LINEOUT2 2.2 C21 68n
TCL2
100k
--10--
MS
MODE MODE
15
MS
15k NR NR 300k 300k 10dB LPF
FWD2
MSSW H : MSON, L : MSOFF MSMODE (H : G1, L : G2) R10 C19 G1 G2 R9 MSTC L : SIGNAL EXIST H : NO SIGNAL 10k 0.015 C18 1k 1.5
10dB
LPF
CXA1910Q
Operation mode control (INSW, AUXSW, TAPESW, DRSW, NRSW, MSSW, MODESW) The CXA1910Q 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 NRSW TAPESW DRSW NRMODE MSSW MSMODE Function for Low input NR OFF 70s PB FWD DOLBY B MS OFF G2 (NOR) MODE Function for High input NR ON 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.
--11--
CXA1910Q
Description of Operation (1) Signal route
(-30dBm) TAPEIN Dolby level (-6dBm) LINEOUT
PBFB PBTC
PBOUT
Op1
Op2
4dB
NR
20dB NR ON NR OFF 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 24dB. Reference input level for Dolby is -30dBm. 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
-6dBm
Dolby level
-30dBm
VR adjustment
-30dBm
-70dBm (315Hz 160n/Wb/m)
Fig. 2 --12--
CXA1910Q
(3) Adjustment of playback equalizer
R1 C1 C2
3
PBFB PBTC Ri PBOUT G1
1
300k G2 G3
2
fc
Fig. 4
PBIN R E IREF
F
1
R4
Fig. 3 1) 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. 2) AC gain adjustment External resistor R1 The external resistor R1 should be adjusted to adjust the AC gain. G3 are obtained by the following equations. G1=10+20log R1+300k R1 (dB)
[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.] 3) 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.
--13--
CXA1910Q
(4) MS (internal detection between tracks) adjustment method
2
G1 G2
3 1 1
2
MSTC 25kHz LPF (in the case of built-in CR only) TAPEIN 10dB 100k 64pF 100k DET MSOUT
MSLPF
G1
G2
3
C3
2
1
R1 C1
1
R2 C2
2
Fig. 5 1) MS gain (FF/NOR mode gain) adjustment External resistors R1 and R2 MS gain is expressed by the following equations. R1 + 100k [dB] R1 R2 + 100k [dB] R2
G1 = 10 + 20log
G2 = 10 + 20log
2) MS low-band cut-off frequency adjustment External resistors R1 and R2 and external capacitors C1 and C2 The external resistors R1 and R2 and external capacitors C1 and C2 should be adjusted to adjust the lowband cut-off frequency for the MS frequency response. 3) MS high-band cut-off frequency adjustment External capacitor C3 The external capacitor C3 should be adjusted to adjust the high-band cut-off frequency for the MS frequency response. (In this case, G1 and G2 have the same cut-off frequency.)
--14--
CXA1910Q
Characteristics Graphs
Current consump tion vs. Sup p ly voltage
18.0 For no signal NR OFF, MS OFF 60 Ta=25C VCC=8.0V NR OFF, MS OFF Output level 25dBm constant
Playb ack equalizer frequency resp onse
Ta=25C
Gain [dB]
Current consumption [mA]
50
17.5
40 120s 30 70s
17.0 50 100 1k Frequency [Hz] 10k
16.5 5.0
6.0
7.0
8.0
9.0
10.0 11.0 12.0 13.0 OUT 300k 0.01 33 270
Supply voltage [V]
Decode b oost frequency resp onse
Ta=25C VCC=8.0V 0dB=Dolby Level -40dB
10
8
Decode boost [dB]
-30dB 6
4
-20dB
2
-10dB 0dB 100 1k Frequency [Hz] 10k
0
--15--
CXA1910Q
Total harmonic distortion (p re-amp lifier b lock)
101 VCC=8.0V Input : PBFIN1 Output : PBOUT1 RL=2.7k f=10kHz Ta=25C
B typ e total harmonic distortion (Dolb y b lock)
100 Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level RL=2.7k Ta=25C
Total harmonic distortion [%]
Total harmonic distortion [%]
100 f=1kHz
10-2
NR OFF f=1kHz
NR B f=100kHz
10-1 f=100Hz
10-1
NR B f=1kHz
NR B f=10kHz 0 4 8 12 14
-8 -24 -20 -16 -12 -8 -4 0 Output level [dBm]
-4
Output level [dB]
Rip p le rejection ratio (PB O UT)
-10 Ta=25C
Ripple elimination ratio [dB]
-20
VCC=8.0V RL=2.7k
-30
-40
-50
-60
50
100
1k 500 Frequency [Hz]
5k
10k
Rip p le rejection ratio (LINEO UT)
Ta=25C -10 VCC=8.0V RL=2.7k NR OFF -30 NR B -40
-20
Ripple elimination ratio [dB]
-50
-60
-70
100
500 1k Frequency [Hz]
5k
10k
--16--
CXA1910Q
Cross talk b etween channels (1ch 2ch)
Ta=25C -30 VCC=8.0V Input : PBFIN1 Output : LINEOUT2 (LINEOUT1 level constant) NR OFF
-40
Cross talk [dB]
-50
-60
-70 100 1k 500 Frequency [Hz] 5k 10k
B lank detection level frequency resp onse
0 Ta = 25C Vcc = 8.0 V Input : TAPEIN 1 MSLPF Pin : 120 pF
-10
-20
Input level [dBm]
-30 HPF Gain 20 dB -40
-50
HPF Gain 40 dB
-60 20 100 1k Frequency [HZ] 10k
MS b lock gain vs. B lank detection level
Ta=25C
-30
VCC=8.0V Input : TAPEIN1 f=1kHz
-40
Input level [dBm]
-50
-60
-70 10 20 30 40 50 60
HPF gain [dB]
--17--
CXA1910Q
Package Outline
Unit : mm
40PIN QFP (PLASTIC)
9.0 0.4 + 0.4 7.0 - 0.1 30 21
+ 0.35 1.5 - 0.15 + 0.1 0.127 - 0.05 0.1
31
20
A
40
11
1 0.65 + 0.15 0.1 - 0.1
+ 0.15 0.3 - 0.1
10 0.12 M
0.5 0.2
(8.0)
PACKAGE STRUCTURE
PACKAGE MATERIAL LEAD TREATMENT LEAD MATERIAL PACKAGE WEIGHT EPOXY RESIN SOLDER / PALLADIUM PLATING COPPER / 42 ALLOY 0.2g
DETAIL A SONY CODE EIAJ CODE JEDEC CODE QFP-40P-L01 QFP040-P-0707
--18--

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