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CXA1897Q
Dolby B Type Noise Reduction System with Recording/Playback Equalizer
Description The CXA1897Q is an analog signal processing IC for tape recorders. It achieves whole processing operations for the recording and playback systems which include the Dolby B noise reduction function on a single chip. This IC supports 2 channels at each function. Features * Dolby B noise reduction supports 1.7 times normal speed. * Recording/playback equalizer amplifier supports 1.7 times normal speed. * Built-in comparator for AMS (automatic music sensor) * Built-in AGC (automatic gain control) with amplifier for MPX filter. * Playback equalizer outputs independently for DECK-A and DECK-B. * Externally adjustable recording equalizer Gp and fp. * Built-in Recording mute function. * Double cassette dubbing system can be easily configured just with this IC. Applications All analog signal processing in cassette deck parts of tape recorders and compact music centers (Sankyo Seiki mfg. Co., Ltd. YK47R-KF202 or equivalent which has the same head type.) Structure Bipolar silicon monolithic IC 48 pin QFP (Plastic)
Absolute Maximum Ratings (Ta=25C) * Supply voltage VCC 12 * Operating temperature Topr -20 to +75 * Storage temperature Tstg -65 to +150 * Allowable power dissipation PD 735 Operating Conditions * Supply voltage
V C C mW
VCC
6.5 to 10.0
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--
E93930D78
CXA1897Q
Block Diagram
GND PB OUTA1 PB FB21 GND GND DECK A PB HEAD GND PB FB22 PB OUTA2 GND
+
+
PB OUTB1
PB FB12
PB INB1
PB INA1 PB INA2
PB FB11
PB INB2
+
+
GND
GND
GND
GND
GND
48 47 46 45 44 43 42 41 40 39 38 37
Vcc GND
GND
PB OUTB2
1
RFC 2 AMS
+
36 35
GND IREF
+ +
GND
AMS OUT Vcc
GND
3 4 5 6 7 8
+
10k
GND
AMS GAIN
+
IREF
Vcc
34 VG 33
10k
GNDGND GND
GND
40k
10dB AMP
10dB AMP
AGC IN GND MPX
+
40k
AGC IREF MUTE
AGC OUT
GND
D REC IN1 D IREF
MPX AGC 30 OUT D REC IN2
31
29
REC EQ REC EQ
+
REC MUTE
D PB IN1 DOLBY NR ON/OFF/HI D L OUT1 GND
9
10
28 27
D PB IN2 DOLBY NR REC/PB
+
+
11
NR
12
TC
25
TC
D R OUT1
REC OUT1
DECK A/B DECK (120/70us) A EQ DECK B EQ
REC OUT2
(N/Cr/Me)
FP CAL
SPEED
GP CAL
REC IN
GND GND PB REC DECK B R/P HEAD
GND
GND GND
REC
--2--
GND
PB
REC IN
GND GND
D R OUT2
13 14 15 16 17 18 19
+ + + +
20 21 22 23 24
+ +
GND
NR
PBEQ CTL
RECEQ CTL
26
D L OUT2
GND
+
AGC TC AGC IN
+ + +
32
CXA1897Q
Pin Configuration
36
GND
35
IREF
34
VG
33
AGC TC
32
AGC IN2
31
AGC OUT2
30
D RECIN2
29
REC MUTE
28
D PBIN2
27
MODE
26
D L OUT2
25
D TC2 D R OUT2 24 REC IN2 23 GP CAL 22 FP CAL 21 SPEED 20 REC OUT2 19 REC OUT1 18 B EQ 17 A EQ 16 DECK AB 15 REC IN1 14 D R OUT1 13 D TC1
37 PB OUTB2 38 PB OUTA2 39 PB FB22 40 PB FB12 41 PB INB2 42 PB INA2
CXA1897Q
43 PB INA1 44 PB INB1 45 PB FB11 46 PB FB 21 47 PB OUTA1
AGC OUT1 AMS GAIN D RECIN1 AMS OUT D L OUT1
48 PB OUTB1
RFC Vcc
AGC IN1
D PBIN1
D IREF
1
2
3
4
5
6
7
8
9
10
NRSW
11
12
--3--
CXA1897Q
Pin Description Pin No. 1 Symbol Vcc DC I/O voltage I/O resistance 8.0V -- -- 1
Vcc
(Ta=25C, Vcc=8 V, no signals) Equivalent circuit
Vcc
Description Power supply pin.
Vcc
x3 x3
2
RFC
8.0V
--
--
2
147
x250 to RFS
Connects the resistor and capacitor for providing a ripple eliminated stable voltage in the power supply.
GND Vcc
3
AMS OUT
8.0V
O
--
3
147 x2
AMS output pin. Connects the resistor and capacitor which determine the attack and recovery time constants of the output to Vcc. No signal supplied High level Signal supplied Low level
GND
Vcc
Vcc
147
5p x2 10k
4
AMS GAIN 2.8V
--
--
4
Connects the resistor which determines the AMS signal detection level.
GND
Vcc
Vcc
5 AGC IN1 32 AGC IN2
4.0V
I
50k
147 10k
5
32
40k x4 VGS GND
AGC signal input pin. The input resistance varies from 50k to 10k. AGC is applied when a signal of -30dB or more level is input to AGC. (Pin 33 external 47F // 300k)
--4--
CXA1897Q
Pin No.
Symbol
DC I/O voltage I/O resistance
Vcc
Equivalent circuit
Vcc x2
Description
6 AGC OUT1 31 AGC OUT2
4.0V
O
147
147
6
31
x4
500 500
21k 5k
10k
AGC output pin.
VGS
GND Vcc Vcc
7 D RECIN1 30 D RECIN2
4.0V
I
40k 7 9
28 30
147
Dolby NR recording (encoding) input pin.
40k VGS 15k GND Vcc Vcc
9 D PBIN1 28 D PBIN2
4.0V
I
40k
15k VGS
Dolby NR playback (decoding) input pin.
x2
8
D IREF
1.2V
--
-- 8
147
4k x4
Connects the 18k resistor for providing the reference current of the Dolby NR section internal filter.
GND Vcc Vcc
10 NRSW
2.5V (For OPEN)
I
53k
147 50k
5k
10
5k
Dolby NR ON/OFF switch. Low : ON Medium :OFF High : 1.7 times normal speed
GND GND
--5--
CXA1897Q
Pin No.
Symbol
DC I/O voltage I/O resistance
Equivalent circuit
Vcc Vcc
Description
x2 147 200 200 x10 6k
11 D L OUT1 26 D L OUT2
4.0V
O
147
11 26
Dolby NR line (decoding) output pin.
GND GND
Vcc x2
Vcc
12 D TC1 25 D TC2
0.3V
--
--
20k
12 25
147 700k
Connects the capacitors (0.1F) which determine the time constants of the input signal level detector.
GND Vcc
GND Vcc 10k 300 300 x10 13k
x2 147
13 D R OUT1 24 D R OUT2
4.0V
O
147
13 24
Dolby NR recording (encoding) output pin.
GND
GND Vcc
Vcc
147
23k
14 REC IN1 23 REC IN2
4.0V
I
50k
14 23
Recording equalizer input pin.
50k 1.8k VGS VGS GND GND
--6--
CXA1897Q
Pin No.
Symbol
DC I/O voltage I/O resistance
Equivalent circuit
Description
15 Playback input deck A/B
Vcc
Vcc
15 16 20 27
DECK AB A EQ SPEED MODE
--
I
--
15 16 20 27
147
GND
GND
selector switch Low : PB INA High : PB INB 16 Deck A equalizer selector switch. Low : 120s EQ High : 70s EQ 20 R e c o r d i n g / p l a y b a c k equalizer speed selector switch. Low : Normal speed High : High speed (1.7 times normal speed) 27 Dolby NR mode selector switch. Low : Recording (encoding) High : Playback (decoding)
Vcc
Vcc
17 B EQ
2.5V (For OPEN)
I
53k
147 50k
5k
17
5k
Deck B equalizer selector switch. Low : Normal tape, 120s EQ Medium : CrO2 tape, 70s EQ High : Metal tape, 70s EQ
GND GND Vcc Vcc x3 500
40k x2 500 5p
18 REC OUT1 19 REC OUT2
4.0V
O
147
18 19
147 x10
Recording equalizer output.
GND GND
--7--
CXA1897Q
Pin No.
Symbol
DC I/O voltage I/O resistance
Vcc
Equivalent circuit
Vcc
Description Connects the resistor to determine the high-band peak frequency of the recording equalizer. Reference setting resistance is 27k. Connects the 12k resistor to determine each gain of the equalizers. Connects the resistor to determine the high-band peak gain of the recording equalizer. Reference setting resistance is 27k.
21 FP CAL 1.2V -- --
21 35
x2
147 5p GND GND
35 IREF
Vcc
Vcc
22 GP CAL
1.2V
--
--
22
x2 147 GND Vcc 50A 20k x2 20k x2 30k
GND Vcc
29 REC MUTE
--
I
--
29
147 2.7V
Recording mute ON/OFF selector switch. Low : Muting ON High :Muting OFF Fader function can be achieved with an external time constant circuit.
GND
GND Vcc x2
Vcc
x2 200 500 x2 5k 100k GND
Vcc 30k x2 x2 500 V S G 500 x4 30k GND
33 AGC TC
0.0V
--
--
33
147 500
Connects the resistor and capacitor to determine the attack and recovery time constants of the AGC.
200
GND
Vcc
34 VG
4.0V
--
60k
34
147 45k
Signal reference voltage. Connects the capacitor for eliminating ripple.
GND
--8--
CXA1897Q
Pin No.
Symbol
DC I/O voltage I/O resistance 0.0V -- --
Vcc
Equivalent circuit
36
Description
36 GND
GND Vcc 10k Vcc RFS
GND pin.
Vcc
43 42 44 41
PB INA1 PB INA2 PB INB1 PB INB2
0.0V
I
70k
10k
1k
Playback equalizer input pin.
210k 5p 147 210k
45 PB FB11 40 PB FB12
1.4V
--
105k
43 42 44 41
x6 147 70k x6
1k x2
45 40
Playback equalizer negative feedback pin.
GND
GND
GND RFS 2k x4 2k x4
Vcc
46 PB FB21 39 PB FB22
2.8V
--
--
147
46 39
7k x3
x3
Connects the capacitors which determine the 120s, 70s or other time constant of the playback equalizer.
GND Vcc Vcc
GND
GND RFS
ON/OFF x3
ON/OFF x2 5k 50k
47 38 48 37
PB OUTA1 PB OUTA2 2.8V PB OUTB1 PB OUTB2
O 147 50k
47 38 48 37
500 147 500 x6 5k
x2
Playback equalizer output pin. The pin selected by the deck AB switching has a low output resistance; the other pin has a 50k output resistance.
GND
GND
--9--
CXA1897Q
Electrical Characteristics
Item Operating voltage Current consumption No signal Conditions Min. 6.5 15.0
(Ta=25C, VCC=8.0V)
Typ. 8.0 19.5 Max. 10.0 24.0 Unit V mA
Item AGC AGC on output level AGC on channel balance AGC on distortion
Conditions 1kHz, -25dBm, AGC TC external 47F // 300k 1kHz, -15dBm, AGC TC external 47F // 300k 1kHz, 0dBm, AGC TC external 47F // 300k
Min. -24.0 -2.0 --
Typ. 0.0 0.1
Max. 2.0 1.5
Unit dBm dB %
-22.5 -20.0
Item AMS No signal detection level
Conditions AMS GAIN=4.7k, 1kHz Reference output level for PB equalizer system (-25.0dBm)
Min. --
Typ. --
Max. -23.0
Unit dB
Item Playback equalizer amplifier block 120s NORM mode frequency characteristics 70s NORM mode frequency characteristics 120s HIGH mode frequency characteristics 70s HIGH mode frequency characteristics Signal handling Total harmonic distortion S/N ratio Output offset voltage
Conditions f=315Hz, Vin=-70dBm reference level f=2.7kHz, Vin=-58.5dBm, against 315Hz f=4.5kHz, Vin=-53.8dBm, against 315Hz f=5.3kHz, Vin=-52.5dBm, against 315Hz f=9.1kHz, Vin=-47.8dBm, against 315Hz 120s-NORM mode, f=1kHz, RL=2.7k, THD+N=1% 120s-NORM mode, f=1kHz, RL=2.7k, Vin=-52dBm 120s-NORM mode, Rg=2.2k, "A" WTG filter 120s-NORM, Rg=70k
Min. -27.0 -1.5 -1.5 0.1 0.1 -10.0 -- 55 2.40
Typ. -0.1 0.3 1.3 1.6 -6.0 0.3 62 2.70
Max. 1.5 1.5 3.1 3.1 -- 0.7 -- 3.20
Unit dBm dB dB dB dB dBm % dB V
-25.0 -23.0
--10--
CXA1897Q
Item Reference input level Reference output level S/N ratio Signal handling Total harmonic distortion Output offset voltage NORM-NORM mode frequency characteristics Recording equalizer amplifier block CrO2-NORM mode frequency characteristics METAL-NORM mode frequency characteristics NORM-HIGH mode frequency characteristics CrO2-HIGH mode frequency characteristics METAL-HIGH mode frequency characteristics Maximum muting amount Muting characteristics
Conditions NORM-NORM, 315Hz NORM-NORM, 315Hz Rg=5.1k, "A"-WTG filter NORM-NORM, RL=2.7k, 1kHz, THD=1% NORM-NORM, RL=2.7k, 1kHz, 0dB NORM-NORM 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB 3kHz, -20dB Against NORM-NORM mode at 315Hz, -20dB 8kHz, -20dB 12kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB Against NORM-NORM 5kHz, -20dB mode at 315Hz, -20dB 15kHz, -20dB 20kHz, -20dB NORM-NORM mode, 1kHz, +8dB NORM-NORM mode, 1kHz, 2.0V (MUTE pin voltage)
Min.
Typ.
Max.
Unit dBm dBm dB dB % V dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB
-29.4 -27.9 -26.4 -- -10.0 -- 57.0 60.6 -- 8.0 8.8 -- -- 0.2 0.5 3.6 4.0 4.4 -1.3 -0.2 1.1 3.7 5.7 7.3 10.4 13.4 16.4 1.8 3.0 4.2 6.7 8.4 9.7 13.2 15.8 18.2 3.3 4.5 5.7 5.9 7.4 8.9 11.3 13.7 15.8 -0.7 0.2 1.7 8.3 10.5 12.3 13.5 16.7 19.5 3.6 4.9 6.0 12.0 14.2 16.0 17.0 20.0 22.5 4.9 6.1 7.3 10.5 12.4 14.0 14.7 17.4 19.7 -- -100 -80 -8.0 -5.6 -4.0
--11--
CXA1897Q
Item PB IN input sensitivity REC IN input sensitivity LINEOUT level Dolby level Encode boost 1-(1) Encode boost 1-(2) Encode boost 1-(3) Encode boost 1-(4) Encode boost 1-(5) Encode boost 2-(1) Encode boost 2-(2) Encode boost 2-(3) Signal handling Total harmonic distortion (1) Total harmonic distortion (2) Encode S/N ratio (REC-PB) (PB-REC) (REC 1ch-2ch) (PB 1ch-2ch) Cross talk
Conditions PB, NR-OFF, 1kHz, D-R-OUT -10dBm REC, NR-OFF, 1kHz, D-R-OUT -10dBm REC, NR-OFF, 1kHz, D-R-OUT -10dBm DOLBY NR REC OUT pin (0dB) REC, NR-ON, 500Hz -25dB REC, NR-ON, 2kHz -25dB REC, NR-ON, 5kHz -25dB REC, NR-ON, 10kHz, -40dB REC, NR-ON, 10kHz 0dB REC, NR-1.7 times, 850Hz -25dB REC, NR-1.7 times, 8.5kHz -25dB REC, NR-1.7 times, 17kHz -40dB REC, NR-OFF, 1kHz, THD+N=1% REC, NR-OFF, 1kHz, 10dB REC, NR-ON, 1kHz, 10dB REC, NR-ON, CCIR-filter PB, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB REC, NR-OFF, 1kHz, 0dB
Min. -32 -32 -7 -- 1.4 5.5 3.9 9.7 -1.1 1.4 3.9 9.7 14.0 -- -- 65.0 -- -- -- --
Typ. -30 -30 -6 -10 3.0 6.3 5.0 10.6 0.7 3.1 5.1 10.4 15.5 0.01 0.03 66.5 -- -- -- --
Max. -28 -28 5 -- 4.4 8.5 6.9 11.9 1.9 4.4 6.9 11.9 -- 0.2 0.2 -- -65 -60 -55 -55
Unit dBm dBm dBm dBm dB dB dB dB dB dB dB dB dB % % dB dB dB dB dB
Dolby block
--12--
CXA1897Q
Item Control voltage "L" level 1 Control voltage "M" level 1 Control voltage "H" level 1 Control voltage "L" level 2 Control voltage "H" level 2 Control voltage "L" level 3 Control voltage "H" level 3 Note) NORM-NORM : CrO2-NORM : METAL-NORM : 120s-NORM : 70s-NORM :
Conditions NRSW (10PIN), B EQ (17PIN) NRSW (10PIN), B EQ (17PIN) NRSW (10PIN), B EQ (17PIN) REC MUTE (29PIN) REC MUTE (29PIN) Other control pins Other control pins
Min. 0.0 2.2 4.2 0.0 3.5 0.0 2.5
Typ. -- -- -- -- -- -- --
Max. Unit 0.5 V 2.8 V Vcc V 0.5 V Vcc V 0.5 V Vcc V
NORMAL TAPE-NORMAL SPEED CrO2 TAPE-NORMAL SPEED METAL TAPE-NORMAL SPEED EQ=120s-NORMAL SPEED EQ=70s-NORMAL SPEED
NORM-HIGH : CrO2-HIGH : METAL-HIGH : 120s-HIGH : 70s-HIGH :
NORMAL TAPE-HIGH SPEED CrO2 TAPE-HIGH SPEED METAL TAPE-HIGH SPEED EQ=120s-HIGH SPEED EQ=70s-HIGH SPEED
--13--
S41 S42
Electrical Characteristics Test Circuit
R71 10k R70 S32 10k S31 R82 100 R81 100
DC Voltmeter
S13
R29*
4.5V 2.5V 0.1 R25* 0.018
2V
0V
3.5V
S7A
330k R31*
V1
V2
V3
V4
V5
ON S11 S12
OFF
REC S16
PB
0dB or 30dB Amp
R69 R53* S24E 10k R80 R68 10k R67 10k *R59 100k S51 S34 R79 100 S43 S21 100 S58 C54
+
C40
300k
+ + +
R20*
12k
C21
C22 47/25V
R23* 47/25V
+
C42
S33 R83 50k S50 GND GND
C25
5.1k 4.7/25V R27* C27 10k 4.7/25V S8 C29 C31 0.1 R33*
+ +
+
+
S20A
10k
36
GND
+
35
IREF VG
R52* C53
+
34
MODE D TC2 AGC TC D PBIN2 AGC IN2 D R OUT2
+
33 24 23 22
27k R44* C50
+
32
10k S24C
31
30
4.7/25V 5.1k S10A 240k C32 R35 4.7/25V 1k R37* C36 S14 C34 0.1 330k 4.7/25V R41* S10C R40* 240k 5.1k C37 R42 4.7/25V 1k
29
28
27
26
25
4.7/25V
S5A 4.7/25V
R12*
C13
AGC OUT2
D RECIN2
R1*
1.2k R2*
1.2k
Audio SG
REC MUTE
D L OUT2 REC IN2 GP CAL FP CAL
27k 4.7/25V 1k 4.7/25V
+
2.7k
37 PB OUTB2 38 PB OUTA2 39 PB FB22 40 PB FB12 21
R57
GND C15*
4.7/25V C56 S22 C44 R49* 0.1 4.7/25V 5.1k S10E R45*
+
0.015
to Each SW
C7
S52
"A"WTG
5V
+
Power Supply
R10*
R9*
+
68k
Vcc
27k
41 PB INB2
SPEED REC OUT2
2.7k C47 R48* C46 R47*
+
20 19 18
C45
+
NORM S25 HIGH
R8*
10k R66
S35 100 R78 S53 S44 S45 R77 R65 10k S36 100
C1
68k
22/25V
+
+
+
C14*
0.015
+
Vcc
AMS OUT
AMS GAIN
AGC IN1
AGC OUT1
D IREF
NRSW
DL OUT1
RFC
D RECIN1
D PBIN1
D TC1
S56
4.7/25V C26
1k 0.1
+
C17
*S20B
0.1
C18
5.1k R26*
10k
C38
C39
0.1 C41
C19
47/25V C20 2.2/25V
C16 100/25V
R21
100k R22* C23 0.47 4.7k C24 R24*
S7B
R36* R38* 330k
C28 R28* S9 4.7/25V C30 330k 0.1 R30* S10B R32* 240k 5.1k 4.7/25V R34* C33 18k S15 C35 0.1 S10D R39* 5.1k 4.7/25V
GND
X1.7 S17
OFF S18 ON
AC
S19
V6
240k
R43 4.7/25V 1k
0.018
+
+
+
+
+
+
+
+
--14--
42 PB INA2 43 PB INA1
REC OUT1 B EQ
C49
+
DC Ammeter
A
47 PB OUTA1
C12
+
R7*
27k 2.7k 4.7/25V
GND
R6*
S24A S24B
DIN Audio
R5*
27k
R4*
68k
R3* 180
27k
44 PB INB1 17 16
C48
+
4.7/25V
R56
68k
R18* 180 47 /25V R16* S6A 2.2k C11 0.1 C5 S1 R15* 4.7/25V S6B 2.2k C10 0.1 S2 4.7/25V C4 C3 S3 4.7/25V 0.1 2.2k C9 S6C S4 R14* 4.7/25V C2 0.1 2.2k C8 S6D R13* R17* C6
47/25V
45 PB FB11
A EQ DECK AB REC IN1 D R OUT1
METAL S26 Cr02 S27 S28 1k NORM R55 120S S29 4.7/25V 70S 1k 4.7/25V R46* 1k C43
+
S54
1kHz BPF
R54 DECK A S30 DECK B
46 PB FB21
15 14 13
4.7/25V
5.1k C52 S23
S10F 0.1 C55
+
100k *R58 R76 4.7/25V R51* 10k S24D R64 100 S46 S55
2.7k 4.7/25V
S5B
48 PB OUTB1
CCIR
R11*
1
R19*
2
3
4
5
6
7
8
9
10
11
12
4.7/25V C51
+
10k 10k R63 10k S24F R50* R62 10k
S37 S57 S38 100 R75 S59
AC Voltmeter
Distortion Analyzer
R61 10k R60 10k
S39 S40 R74 100 R73 100 R72 100 S47 S48 S49
CXA1897Q
Oscillo -scope
CXA1897Q
1. Description of Control Mode (1) Playback and recording equalizers 1) Playback equalizer (120s/70s) A EQ (16 pin) L H L B EQ (17 pin) M/H
DECK AB L 120s 70s A EQ control complied with (15 pin) (A DECK) (A DECK) H B EQ control complied with 120s 70s (B DECK) (B DECK)
2) Recording equalizer (Normal, CrO2, Metal) B EQ (17 pin) REC MODE 3) Speed control SPEED (20 pin) Playback equalizer Recording equalizer 4) Recording mute (29 pin) Recording mute Mute ON Control voltage GNDVCL0.5V -7dB attenuation Mute OFF 2.0V 3.5VVCHVcc L Normal speed Normal speed H 1.7 times normal speed 1.7 times normal speed L Normal (Type I) M CrO2 (Type II) H Metal (Type IV)
The muting function is achieved by varying the gain of the recording equalizer amplifier as with an electric volume, depending on the DC voltage level supplied to the REC MUTE pin. Mute ON/OFF and the AGC ON/OFF are interlocked. Rec Mute AGC Mute ON OFF Mute OFF ON
Notes for executing the fader function The recording mute and the AGC are interlocked and if the AGC is turned OFF, the AGC output level is increased. Therefore, when the level of 3dB or more is input to the AGC to execute the fader function, the natural characteristics cannot be obtained. Take care of setting the input level to the AGC. 5) FP CAL (21 pin) The standard setting resistance is 27k. However, fo (Hz) is reduced by increasing and increased by reducing this resistance. 6) GP CAL (22 pin) The standard setting resistance is 27k. However, the gain is increased by increasing or reduced by reducing this resistance.
--15--
CXA1897Q
(2) Dolby B noise reduction 1) Dolby NR input mode MODE (27 pin) Input Dolby NR 2) Dolby NR ON/OFF/x1.7 NRSW (10 pin) Dolby NR L ON M OFF H x1.7 L Rec In (7, 30 pin) Encoding H Pb In (9, 28 pin) Decoding
--16--
CXA1897Q
2. AMS (1) AMS output logic Detection status AMS OUT Signal detected L No signal detected H
Inside of IC
When the pins have been connected as shown on the left figure, 1
Vcc
Low : Approximately 0.3V (VCE (sat) voltage) High : Vcc (V) 3
AMS OUT
36
GND
(2) AMS level setting With the reference output level (-25dBm) of the playback equalizer as 0dB, consider at how many decibels the AMS level is to be set.
{ Vpeak (PBOUT1)+Vpeak (PBOUT2) } 2
R (external resistance)
x55A Compare
R=
Vpeak (PBOUT1)+Vpeak (PBOUT2) x106 -- 1 2
Use formula 1 to determine external resistance R. Ex. 1) To set the detection level at 20dB lower than the reference (calculated on the assumption that 1ch=2ch) -25dBm-20dB=-45dBm=6.16mVpeak R=6.16x10-3x106 6.2k In which case, external resistance R is 6.2k. Ex. 2) To set the detection level at 30dB lower than the reference, -25dBm-30dB=-55dBm=1.95mVpeak R=1.95x10-3x106 2k In which case, external resistance R is 2k. (3) AMS band setting By inserting a capacitor in series with the external resistor determined in (2), the direct current of the AMS is cut off. The lower end of the AMS band can be limited by adjusting the capacitor value because the cut-off frequency of the high-pass filter is determined by this external resistor and capacitor.
--17--
CXA1897Q
Application Circuit
180p to LINE OUT2 4.7/25V
AGC IN2
ON/OFF
GND GND GNDGND GND 33/25V
GND GND 47/25V
GND GND 100p
PB/REC
12mH
GND 4.7/25V +
GND
1M 4.7/25V
47/25V
MPX
-6dB 4.7/25V 4.7/25V
12k
+
+
4.7/25V
+ +
+
+
36
GND
35
IREF
34
VG
33
AGC TC
32
AGC IN2
31
AGC OUT2
30
D RECIN2
29
REC MUTE
28
D PBIN2
27
MODE
26
D L OUT2
25
D TC2
22k GND GND GND GND 5.6k 22k 27k 27k 4.7/25V 150p 180p NORM/HIGH + 0.47 +
GND
+
10k
37 PB OUTB2 38 PB OUTA2
D R OUT2 24 REC IN2 23 GP CAL 22 FP CAL 21 SPEED 20
0.1
+
+
10k
10k
10k
2.2/25V + 2.2/25V
2.7k 4.7/25V 10k 0.015
39 PB FB22 40 PB FB12 41 PB INB2
GND
+
GND
47/25V 180
10k 2.2/25V + 820p 10k 10k 820p
DECK A PB HEAD
42 PB INA2
CXA1897Q
REC OUT2 19 REC OUT1 18 B EQ 17 A EQ 16 DECK AB 15 REC IN1 14 AGC OUT1 AMS GAIN D RECIN1 AMS OUT D L OUT1 AGC IN1 D PBIN1 D IREF NRSW D TC1 D R OUT1 13
2.2/25V +
43 PB INA1
GND
Bias 12mH 12mH OSC 180p
150p 4.7/25V
PB
44 PB INB1
0.015
10k 10k 10k +
GND
45 PB FB11 46 PB FB21 47 PB OUTA1 48 PB OUTB1
RFC Vcc
47/25V 180
NORM/CrO2 /METAL GND 120S/70S GND DECK A /DECK B GND
REC
+
GND
4.7/25V + 4.7/25V 22k 5.6k 22k
GND
4.7/25V + 2.7k
10k
2.2/25V + 2.2/25V
10k
1
1k
2
3
100k
4
4.7k
5
4.7/25V
6
4.7/25V +
7
4.7/25V +
8
9
4.7/25V +
10
11
4.7/25V
12
0.47 GND GND
10k
100/25V
47/25V
0.47
10k
MPX
4.7/25V
-6dB
100p 18k
2.2/25V
+
VCC
12mH
180p
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 patent and other right due to same.
--18--
ON/OFF/X1.67
GND GND
AMS OUT
GND
GND
GND GND GND
GND
to LINE OUT1
AGC IN1
VCC
GND
0.1
DECK B R/P HEAD
PB
REC
+ +
+
+
+
+
+
CXA1897Q
Examples of representative characteristics Quiescent current vs. Supply voltage AGC output voltage characteristics
AGC OFF 25 Icc-Quiescent current (mA) 0 Output level (dBm)
-10
20
-20 AGC ON
15 8 9 7 10 VCC-Supply voltage (V) 11
-30 -40 -30 -20 -10 Input level (dBm) 0
AGC total harmonic distortion
0.5 Vcc=8V AGC TC 47F/300k f=1kHz Total harmonic distortion (%)
Play back equalizer total harmonic distortion
VCC=8V RL=2.7k MODE 120s-NS f=1kHz
1.0 Total harmonic distortion (%)
0.1
0.05
0.01
0.1
-40
-30 -20 -10 AGC Input level (dBm)
0
-30
-25
-20 -15 -10 Output level (dBm)
-5
AMS no signal detection level frequency response
AMS Input level (Playback equalizer output level) (dB) VCC=8V 120s-NS AMS OUT 7V 0dB=-25dBm, 315Hz (Playback equalizer reference output level) AMS GAIN 4 0.47 4.7k 2.2 + AMS OUT 3 100k to 8V -20 20 50 100 200 500 1k 2k 5k 10k 20k 50k Frequency (Hz)
10
0
-10
-30
--19--
CXA1897Q
PB FB1
60
+
PB IN
Playback equalizer frequency response
PB FB2 47 180
PB OUT M 4.7 +
4.7 50 2.2k 120s-NS 120s-HS 70s-NS 70s-HS 50 100 200 500 1k 2k Frequency (Hz) 5k 10k 20k 50k + GAIN (dB) 40 30 20 10 20
0.015
Recording equalizer frequency response
26 24 22 20 Output response (dB) 18 16 14 12 10 8 6 4 2 0 -2 -4 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k Frequency (Hz) VCC=8V 0dB=NORM-NORM, 315Hz, -30dBm (Tape) (Speed) NORM-NORM CrO2-NORM METAL-NORM NORM-HIGH CrO2-HIGH METAL-HIGH
B type encode characteristics
10 8 Encode boost (dB) -30dB 6 VCC=8V 0dB=Dolby Level =-10dBm -40dB
4 -20dB 2 -10dB 0dB 20 50 100 200 1k 500 Frequency (Hz) 2k 5k 10k 20k
0
--20--
CXA1897Q
Recording equalizer total harmonic distortion
VCC=8V 0dB=-10dBm RL=2.7k MODE : NORM-NORM (Tape) (Speed) 100Hz 1kHz 10kHz
Output level vs. MUTE voltage
0 -10 -20 Output level (dB) -30 -40 -50 -60 -70 -80 VCC=8V MODE : NORM-NORM (Tape) (Speed) 0dB=1kHz, +8dB f=1kHz 0.0 1.0 2.0 3.0 4.0 5.0 6.0 REC MUTE pin voltage (V)
Total harmonic distortion (%)
1.0
0.1 -90 -10 -5 0 5 10 Output level (dB) 15
NR off total harmonic distortion
VCC=8V Encode Mode, RL=10k 0dB=Dolby Level 100Hz 1kHz 10kHz
B type total harmonic distortion
VCC=8V Encode Mode, RL=10k 0dB=Dolby Level 100Hz 1kHz 10kHz
Total harmonic distortion (%)
0.1
Total harmonic distortion (%)
1.0
1.0
0.1
0.01 -10 -5 0 10 15 5 Output level (dB)
0.01 -10 -5 0 10 15 5 Output level (dB)
--21--
CXA1897Q
Package Outline
Unit : mm
48PIN QFP (PLASTIC)
15.3 0.4 + 0.4 12.0 - 0.1 + 0.1 0.15 - 0.05 0.15 36 25
37
24
48
13
+ 0.2 0.1 - 0.1
1 + 0.15 0.3 - 0.1
12
0.8
0.24
M
+ 0.35 2.2 - 0.15
PACKAGE STRUCTURE
PACKAGE MATERIAL SONY CODE EIAJ CODE JEDEC CODE QFP-48P-L04 QFP048-P-1212 LEAD TREATMENT LEAD MATERIAL PACKAGE MASS EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.7g
NOTE : PALLADIUM PLATING This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame).
--22--
0.9 0.2
13.5

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