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CXA1911Q
Dolby B/C Type Noise Reduction System with Playback Equalizer
For the availability of this product, please contact the sales office.
Description The CXA1911Q is an IC designed for use in car stereo cassette decks. Functions include Dolby B/C 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/C type noise reduction and playback equalizer into a single chip * Same pin configuration as Dolby B type noise reduction system (CXA1910Q) * 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 stereo cassette decks * Cassette decks (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 Conditions * Supply voltage VCC 7.8 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--
E93Y13-TE
CXA1911Q
Block Diagram
PBOUT1 TAPEIN1 LINEOUT1
GND
30
29
28
NC
27
NC
26
VCT
25
24
TCL1
23
TCH1
22
NRSW
21
PBTC1
32
31
20
NC TAPESW DRSW NRMODE MSSW MSMODE G1 (FF) G2 (NOR) MSTC MSOUT
PBFB1
33
NR IN
18
300k F/R
PBRIN1 PBFIN1
35 34
PBGND
36
E IREF PBFIN2 PBRIN2 PBFB2 PBTC2
37
F/R
10dB
38
LPF
G1/G2
13
300k
39
40
1
2
3
4
5
6
7
8
9
10
LINEOUT2
TAPEIN2
PBOUT2
MSLPF
D IREF
TCH2
TCL2
Vcc
--2--
MSGND
NC
11
12
NR
DET
14
NR
15
DR
A MS
MODE
16
TA PE
17
19
CXA1911Q
Pin Description Pin No. 1 30 32 39 33 34 37 38 2 3 28 Symbol PBOUT PBFB PBIN DC value 2.1V 2.1V 0V Z (in) -- 300k -- Equivalent circuit Refer to Page 7.
(Ta=25C, VCC=8.0V, no signal) Description PBEQ output PBEQ feedback PBEQ input
VCC TAPEIN
8.0V 4.0V
-- 40k
Power supply TAPE input
3
28
147
40k
VGS
12A
4 20 26 27 5
NC
--
--
No connection
MSLPF
4.0
100k
VCC 100k
Adjustment of MS LPF frequency
5
147 64p GND
--3--
CXA1911Q
Pin No. 6
Symbol D IREF
DC value 1.25V
Z (in) --
Equivalent circuit
Description Connection of reference current setting resistor for Dolby block
6
147
7 LINEOUT 24
4.0V
--
VCC
50k
Line output
147
200 200
7
24
GND
8 23
TCL
0.3V
--
Time Constant pin for the LLS
8
480k
147 23
9 22
TCH
0.3V
--
13.5k
Time Constant pin for the HLS
9
330k
147 22
10 29 35
MSGND GND PBGND
0.0V
--
36k
Ground
--4--
CXA1911Q
Pin No. 11
Symbol MSOUT
DC value
0.2 V for signal detection; 5.0 V for no signal detection
Z (in) --
Equivalent circuit
VDD=5V VCC
Description MS output
147 11 20k
GND
12
MSTC
Approx. 1.4 V for signal detection; 5.0 V for no signal detection
--
VDD=5V Vcc 147 12 1k 50
Connection of MS detection time constant
GND
13 14
G2(NOR) G1(FF)
4.0V
--
VCC 10 13 147 14 100k 100
MS feedback
GND
15 MSMODE 18 DRSW
--
--
15 18 19 147 21 50 50
19
TAPESW
MSMODE MS gain selector G1 when high, G2 when low DRSW Head selector Reverse when high, Forwards when low TAPESW Equalizer selector 120s when high, 70s when low NRSW NR ON/OFF selector
21 16
NRSW MSSW -- --
VCC 50 147 16 50
MS on/off selector MS on when high, MS off when low
GND
--5--
CXA1911Q
Pin No.
Symbol
DC value --
Z (in) --
Equivalent circuit
Description Noise reduction selector C when high, B when low
17 NRMODE
50
50
17 147
25
VCT
4.0V
--
30k
50k
2.5V
VCC/2 output
Q3 147 25 45k to VGS
31 40
PBTC
--
--
30k
VCC
PBEQ capacitance
147 31 40
42
30 GND
36
E IREF
1.25V
--
VCC
Connection of reference current setting resistor for PBEQ block
147 36
1.25V
10 GND
--6--
CXA1911Q
* PBOUT, PBFB, PBIN equivalent circuit
Vcc
VREG
PBOUT
147
1
30 PBFB 300k 10p
32 39
PBIN 33 34 37 38
600
GND
Electrical Characteristics (Ta=25C, VCC=8.0 V, RL: output load resistance, Rg: head equivalent impedance; unless otherwise specified, 120 s, FWD mode, NR OFF, MS OFF)
Item Operating voltage Current consumption Dolby block (Dolby level -6 dBm=0 dB) TAPE IN input sensitivity NR B decode boost 1 NR B decode boost 2 NR B decode boost 3 NR B decode boost 4 NR B decode boost 5 NR C decode boost 1 NR C decode boost 2 NR C decode boost 3 NR C decode boost 4 NR C decode boost 5 NR C decode boost 6 VTIN BP1 BP2 BP3 BP4 BP5 CP1 CP2 CP3 CP4 CP5 CP6 LINE OUT=0dB 1kHz 500Hz, LINE OUT -25dB, NR B, TAPE IN 2kHz, LINE OUT -25dB, NR B, TAPE IN 5kHz, LINE OUT -25dB, NR B, TAPE IN 10kHz, LINE OUT -40dB, NR B, TAPE IN 10kHz, LINE OUT 0dB, NR B, TAPE IN 500Hz, LINE OUT -60dB, NR C, TAPE IN 500Hz, LINE OUT -25dB, NR C, TAPE IN 2kHz, LINE OUT -60dB, NR C, TAPE IN 2kHz, LINE OUT -25dB, NR C, TAPE IN 5kHz, LINE OUT -25dB, NR C, TAPE IN 10kHz, LINE OUT 0dB NR C, TAPEIN -32.0 -30.0 -28.0 dBm 1.4 5.5 3.9 9.7 -1.1 14.2 7.2 18.7 5.4 3.5 -5.5 3.4 6.0 5.1 10.2 0 16.5 9.8 20.9 7.3 5.7 -3.9 4.4 8.5 6.9 11.9 1.9 18.2 11.2 22.7 9.4 7.5 -1.5 dB dB Symbol Vopr ICC No signal
Measurement conditions (input pin, input level frequency etc.)
Min.
7.8 18.5
Typ. Max. Unit
8.0 21.9 11.0 25.5 V mA
--7--
CXA1911Q
Electrical Characteristics
Item TAPE IN total harmonic distortion 1 TAPE IN total harmonic distortion 2 TAPE IN total harmonic distortion 3 Decode S/N ratio Signal handling Cross talk TAPE IN 1 ch 2 ch LINE OUT offset voltage B/C Switching noise Playback equalizer amplifier block 120 s FWD frequency response 70 s FWD frequency response Signal handling Total harmonic distortion S/N ratio Output offset voltage Cross talk between channels Cross talk between RVS and FWD PBREF PB F IN 315Hz -70dBm VPBO=0dB F120F F70F F120R VSH2 THD6 SN3 VOS2 CT4 CT5 PB F IN 2.7 kHz -58.5 dBm for 315 Hz PB F IN 4.5 kHz -53.8 dBm for 315 Hz PB R IN 315 Hz -70 dBm for 315 Hz PB F IN 1kHz THD=1% RL=2.7k PB F IN 1kHz -52dBm RL=2.7k No signal "A" weighting filter ON No signal Rg=2.2 k TAPE IN 1kHz -42dBm -27.0 -25.5 -23.0 dBm -1.5 -1.5 -1.0 -- 57.0 1.55 -- -- -0.8 -0.0 -0.3 0.11 61.1 1.95 -80.5 -77.7 1.5 1.5 1.0 -- 0.5 -- 2.35 -70 -65 dB dB dBm % dB V dB Symbol THD1 THD2 THD3 SN1 SN2 VSH1 CT3 VOS1 VBOTU
Measurement conditions (input pin, input level frequency etc.)
TAPE IN -20dBm 1kHz R1=2.7k TAPE IN -20dBm 1kHz NR B R1=2.7k TAPE IN -20dBm 1kHz NR C R1=2.7k No signal NR B CCIR/ARM filter No signal NR C CCIR/ARM filter TAPE IN 1kHz RL=2.7K THD=1% TAPE IN -24dBm 1kHz No signal Level at PB IN to LINE OUT, LINE OUT
Min.
-- -- -- 77.0 80.0 13.5 -- 3.9 --
Typ. Max. Unit
0.01 0.04 0.07 84.0 82.0 14.4 -91 4.0 70 0.2 0.2 0.3 -- -- -- -55 4.1 100 V mV dB dB %
-10.0 -3.0
Interval detection between tracks (MUSIC SENSOR) block TAPE IN 5 kHz AMS ON (G1 mode) VMS1 Signal detection level 1 External constant 10 k, 0.015 F Signal detection level 2 MS output leak current MS output saturation voltage Logic voltage VIL 2-value input VIH Boost charge circuit block PBFB boost charge current Boost charge ON VCT level Boost charge OFF VCT level ICRG VCRG1 VCRG2 No signal, 3.4 V applied to VCT and 1.8 V to PBFB No signal, VCT level when boost charge ON No signal, VCT level when boost charge OFF NRSW, TAPESW, DRSW, NRMODE, MSSW, MSMODE VMS2 IOH VOL TAPE IN 5 kHz AMS ON (G2 mode) External constant 1 k, 1.5 F TAPE IN 5 kHz -10 dBm, 5 V applied to AMSOUT TAPE IN 5 kHz -30 dBm, 1 mA applied to AMSOUT
-43.0 -39.0 -35.0 dBm -62.5 -58.5 -54.5 -- -- 0.0 0.3 1.0 1.0 A V
0.0 2.5
-- --
0.8 V VCC
1.0 -- 3.6
3.0 -- --
-- 3.4
mA
V --
--8--
Electrical Characteristics Measurement Circuit
R43 100 10k 100 S19 0dB or 30dB S17 S18 10k S16
G1
R42 R41 R40
DC Voltmeter
R19
138.5k
Amp
R17 5.1k S13 50k S26
GND
R44
S7
S5
0.1
OFF : 0dB ON : 30dB
C10 1
C24
R14
2.7k
1
30 23 21
R13
29 28 27 26 25 24 22
C13
C18
10
R30 C29 22 C22 2.7k 68n
V7
GND
NC
NC
GND
VCT
TCL1
TCH1
31
NRSW
S28
PBOUT1
TAPEIN1
1.2k
C2
10n
LINEOUT1
V5
Audio SG
PBTC1 NC
V4
33 270 C8
20
S29
32
R1
R2 1.2k
R10
33
34
17
Power Supply
4.7 C5
R5 S2
V3
19.2k
PBRIN1 DRSW
V2
18
GND
R6 S1
2.2k C6
PBFB1 TAPESW
19
"A" WTG
19.2k
PBFIN1 NRMODE
V1
S30
35
R15 2.2k 15k
PBGND MSSW MSMODE E IREF
37
14
38
19.2k
PBRIN2 G2 MSTC PBFB2
13
39
12
10n
C25
0.1 R33
40
R12 C1
270 C7 33
PBOUT2
Vcc
TAPEIN2
NC
MSLPF
D IREF
LINEOUT2
TCL2
TCH2
PBTC2
10 1
MSOUT 10
11
1MEG
R11
2.7k
C9
20k C19
MSGND
S8 C12
C23 68n
0.1
S15
S6
R28
C11 10 R16
5.1k
R29 2.2 2.7k C21
R45
C16
150P
R18
138.5k
S14
100k
--9--
36 1 5
C4 4.7 C3 R32 C27
GND
R8 R4 S3
16
Vcc
R9
4.7 2.2k
DIN Audio
S31
19.2k
R3 S4 4.7 2.2k
PBFIN2 G1
10k 0.015 C26 R31 1k 1.5 R39 10K R38 100 S20
1kHz BPF
R7
S32 S21
CCIR
1
2 3 5 7 4 6 8
9
DC Ammeter A
AC Voltmeter
Distortion Analyzer
R37 R36 R35 R34
10k 10k 100 100
S22 S23 S24 S25
CXA1911Q
Oscillo -scope
CXA1911Q
Operating modes (TAPESW, DRSW, NRSW, MSSW, MODESW, NRMODE) The CXA1911Q has an NR switch (NRSW), NR mode switch (NRMODE), equalizer switch (TAPESW), head switch (DRSW), MS switch (MSSW), and MS gain switch (MSMODE). The operating modes for each switch are shown in the following table. SW NRSW NRMODE TAPESW DRSW MSSW MSMODE Function for Low input NR OFF DOLBY B 70S PB FWD MS OFF G2 MODE Function for High input NR (B/C) ON DOLBY C 120s PB RVS MS ON G1 MODE
Click noise can be reduced by the external CR time constant for NRSW switching.
--10--
CXA1911Q
Description of Operation 1. Signal route
PBFB PBTC
PBOUT
TAPEIN
Dolby level (-6dBm) LINEOUT
Op1
Op2
4dB
NR
20dB NR ON NR OFF 20dB
PBIN F R
Fig. 1 Op1 and Op2 are operational amplifiers. Op1 composes 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 is 24 dB. The Dolby reference level is -6 dBm (LINEOUT). The adjustment method of playback equalizer is described in the paragraph (3). Note) Usually the TAPEIN pin level is adjusted by attenuator connected to PBOUT pin. The capacitance value connected to PBFB can be reduced by adjusting the resistance connected to PBFB to match the PBOUT level. With this method, the capacitance value can be reduced according to the amount that the resistance value is increased even for the same cut-off frequency. (These specifications use the latter method.)
--11--
CXA1911Q
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
0dB -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -70dBm (315Hz 160nWb/m) VR adjustment -6dBm Dolby level
-30dBm
-30dBm
Fig.2 Note) This diagram illustrates the case where the Dolby level is aligned by adjusting the resistance value connected to PBFB.
--12--
CXA1911Q
3. PBEQ adjustment
3
R1 C2
2
3
PBFB
C1 PBTC PBOUT
3
fc
1
Ri
2
R3
F
PBIN R
E IREF
1
R4
1) EQ curve gain difference (=adjustment of internal variable R) IREF resistor To adjust the EQ curve gain differences (G1 - G2, G1 - G3), the E IREF resistor should be adjusted to change the internal variable resistance value. 2) AC gain External resistor R1 The external resistor R1 should be adjusted to adjust the AC gain. G1 is obtained by the following equation. R1 + R3 (R3 = 300k) R1
G1=20log
3) Low-band cut-off frequency External resistor R1 and capacitor C1 The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor C1. Note) In this diagram, C1 and R1 are not connected in series, but are connected to PBFB from between R1 and C2. This is to prevent the sound quality from deteriorating when using an electrolytic capacitor.
--13--
CXA1911Q
4. MS (internal detection between tracks) adjustment method
2
G1 G2
3 1 1
2
MSTC 25kHz LPF (in the case of built-in only) TAPEIN 10dB 100k 64pF 100k DET MSOUT
MSLPF
G1
G2
3
C3
1 2
R1 C1
1
R2 C2
2
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--
CXA1911Q
Characteristics Graphs
Current consump tion vs. Sup p ly voltage
Ta=25C 22.0 For no signal NR OFF, MS OFF 60 VCC=8.0V NR OFF, MS OFF Output level 25dBm constant
Playb ack equalizer frequency resp onse
Ta=25C
Current consumption [mA]
21.5
Gain [dB]
50
40 120s 30 70s
21.0 50 100 1k Frequency [Hz] 10k
20.5 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]
B typ e decode characteristics
12 -40dB 10 VCC=8.0V 0dB=Dolby Level -30dB
8
Decode boost [dB]
6 -20dB
4
2
-10dB 0dB 50 100 500 1k Frequency [Hz] 5k 10k
0
C typ e decode characteristics
24 VCC=8.0V 0dB=Dolby Level -50dB 16
Ta=25C
-60dB
20
-40dB
Decode boost [dB]
12 -30dB 8 -20dB
4
0
-10dB 0dB 50 100 500 1k Frequency [Hz] 5k 10k
-4
--15--
CXA1911Q
Total harmonic distortion (p re-amp lifier b lock)
101 VCC=8.0V Input : PBFIN1 Output : PBOUT1 RL=2.7k f=10kHz Ta=25C 100
B typ e total harmonic distortion
Ta=25C Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level RL=2.7k
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 Output level [dB] 12 14
-8 -24 -20 -16 -12 -8 -4 0 Output level [dBm]
-4
C typ e total harmonic distortion
101 Input : TAPEIN1 Output : LINEOUT1 VCC=8.0V 0dB=Dolby Level RL=2.7k Ta=25C -10 Vcc=8.0V RL=2.7k
Rip p le rejection ratio (PB O UT)
Ta=25C
Ripple elimination ratio [dB]
-20
-30
Total harmonic distortion [%]
100
-40
NR C f=10kHz
-50
NR C f=100kHz 10-1 NR C f=1kHz
-60 50 100 500 1k 5k 10k Frequency [Hz]
10-2 -8 -4 0 4 8 12 Output level [dB]
--16--
CXA1911Q
Rip p ler rejection ratio (LINEO UT)
-10 VCC=8.0V RL=2.7k Ta=25C -30
Cross talk b etween channels (1ch 2ch)
Ta=25 C Vcc=8.0V Input : PBFIN1 Output : LINEOUT2 (LINEOUT1 level constant) NR OFF
-20
Ripple elimination ratio [dB]
NR OFF
-40
-30 NR B -40 NR C -50
Cross talk [dB]
-50
-60
-60
-70 100 1k 500 Frequency [Hz] 5k 10k
-70
100
500
1k
5k
10k
Frequency [Hz]
B lank detection level frequency resp onse
0 Ta = 25C VCC = 8.0 V Input : TAPEIN 1 MSLPF Pin: T120 pF
MS b lock gain vs. B lank detection level
Ta=25C
-10
-30
VCC=8.0V Input : TAPEIN1 f=1kHz
-20
Input level [dBm]
-30
-40
-40
Input level [dBm]
10k
HPF Gain 20 dB
-50
-50
HPF Gain 40 dB
-60 20 100 1k Frequency [HZ] -60
-70 10 20 30 40 HPF gain [dB] 50 60
--17--
CXA1911Q
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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