cxa1897q Sony Electronics, cxa1897q Datasheet

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cxa1897q

Manufacturer Part Number
cxa1897q
Description
Dolby B Type Noise Reduction System With Recording/playback Equalizer
Manufacturer
Sony Electronics
Datasheet
Description
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
• Recording/playback equalizer amplifier supports
• Built-in comparator for AMS (automatic music
• Built-in AGC (automatic gain control) with amplifier
• Playback equalizer outputs independently for
• Externally adjustable recording equalizer Gp and
• Built-in Recording mute function.
• Double cassette dubbing system can be easily
Applications
of tape recorders and compact music centers
Structure
The CXA1897Q is an analog signal processing IC
speed.
1.7 times normal speed.
sensor)
for MPX filter.
DECK-A and DECK-B.
fp.
configured just with this IC.
All analog signal processing in cassette deck parts
(Sankyo Seiki mfg. Co., Ltd. YK47R-KF202 or
equivalent which has the same head type.)
Bipolar silicon monolithic IC
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.
Dolby B Type Noise Reduction System with Recording/Playback Equalizer
These ICs are available only to the licensees of Dolby Laboratories Licensing Corporation from whom licensing and applications
"Dolby" and the double D symbols are trade marks of Dolby Laboratories Licensing Corporation.
information may be obtained.
—1—
Absolute Maximum Ratings (Ta=25°C)
• Supply voltage
• Operating temperature
• Storage temperature
• Allowable power dissipation
Operating Conditions
• Supply voltage
CXA1897Q
48 pin QFP (Plastic)
V
Topr
Tstg
P
V
CC
D
CC
–65 to +150
–20 to +75
6.5 to 10.0
735
12
E93930D78
mW
°C
°C
V
V

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cxa1897q Summary of contents

Page 1

... 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 ...

Page 2

... GND GND PB PB REC REC DECK B R/P HEAD —2— CXA1897Q GND + GND 35 IREF AGC TC 10k AGC MPX AGC OUT 30 D REC IN2 REC 29 MUTE 28 ...

Page 3

... PB FB11 OUTA1 48 PB OUTB1 CXA1897Q —3— CXA1897Q OUT2 23 REC IN2 22 GP CAL 21 FP CAL 20 SPEED 19 REC OUT2 18 REC OUT1 DECK AB 14 REC IN1 ...

Page 4

... Vcc 147 10k 5 32 40k 4 VGS GND —4— CXA1897Q (Ta=25°C, Vcc signals) Description Power supply pin. Connects the resistor and capacitor for providing a ripple eliminated stable voltage in the power supply. AMS output pin. Connects the resistor and capacitor which determine the attack and recovery time constants of the output to Vcc ...

Page 5

... GND Vcc Vcc 5k 147 50k 10 5k GND GND —5— CXA1897Q Description AGC output pin. Dolby NR recording (encoding) input pin. Dolby NR playback (decoding) input pin. Connects the 18k resistor for providing the reference current of the Dolby NR section internal filter. Dolby NR ON/OFF switch. ...

Page 6

... Vcc 147 23k 14 23 50k 1.8k VGS VGS GND GND —6— CXA1897Q Description Dolby NR line (decoding) output pin. Connects the capacitors (0.1µF) which determine the time constants of the input signal level detector. Dolby NR recording (encoding) output pin. Recording equalizer input pin. ...

Page 7

... Vcc 3 40k 500 147 500 19 10 GND GND —7— CXA1897Q Description Playback input deck A/B 15 selector switch Low : PB INA High : PB INB Deck A equalizer selector 16 switch. Low : 120µs EQ High : 70µ equalizer speed selector switch ...

Page 8

... 147 500 45k 4 30k GND GND —8— CXA1897Q 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 ...

Page 9

... GND GND —9— CXA1897Q Description GND pin. Vcc Playback equalizer input pin Playback equalizer negative feedback pin. GND Connects the capacitors which determine the 120µs, 70µs or other time constant of the playback equalizer. ...

Page 10

... Conditions Min. — Conditions Min. –27.0 –1.5 –1.5 0.1 0.1 =2.7k , THD+N=1% –10.0 L =2.7k , Vin=–52dBm — 2.40 —10— CXA1897Q (Ta=25°C, V =8.0V) CC Typ. Max. Unit 8.0 10.0 V 19.5 24.0 mA Typ. Max. Unit –22.5 –20.0 dBm 0.0 2.0 dB 0.1 1.5 % Typ. Max. Unit — ...

Page 11

... Against NORM-NORM mode at 315Hz, –20dB 5.9 11.3 Against NORM-NORM –0.7 mode at 315Hz, –20dB 8.3 13.5 Against NORM-NORM 3.6 mode at 315Hz, –20dB 12.0 17.0 Against NORM-NORM 4.9 mode at 315Hz, –20dB 10.5 14.7 — –8.0 —11— CXA1897Q Typ. Max. Unit dBm –10.0 — dBm 60.6 — dB 8.8 — dB 0.2 0.5 % 4.0 4.4 V –0.2 1.1 dB 5.7 7 ...

Page 12

... REC, NR-OFF, 1kHz, 0dB (PB 1ch-2ch) REC, NR-OFF, 1kHz, 0dB Conditions Min. –32 –32 –7 — 1.4 5.5 3.9 9.7 –1.1 1.4 3.9 9.7 14.0 — — 65.0 — — — — —12— CXA1897Q Typ. Max. Unit –30 –28 dBm –30 –28 dBm –6 5 dBm –10 — dBm 3.0 4.4 dB 6.3 8.5 dB 5.0 6.9 dB 10.6 11.9 dB ...

Page 13

... Min. 0.0 2.2 4.2 0.0 3.5 0.0 2.5 NORM-HIGH : NORMAL TAPE-HIGH SPEED CrO -HIGH : CrO TAPE-HIGH SPEED 2 2 METAL-HIGH : METAL TAPE-HIGH SPEED 120µs-HIGH : EQ=120µs-HIGH SPEED 70µs-HIGH : EQ=70µs-HIGH SPEED —13— CXA1897Q Typ. Max. Unit — 0.5 V — 2.8 V — Vcc V — 0.5 V — Vcc V — ...

Page 14

... R22* 100k /25V 2.2 OUT AMS C20 /25V 0.1 RFC C18 0.1 Vcc C17 /25V 100 0.015 C14 /25V 22 C1 —14— CXA1897Q C41 C39 S19 1k ON 4.7 R43 S18 OFF X1.7 C38 S17 240k R38* 330k 0.1 R36* C33 240k R30* 330k 0.1 R28* C28 S7B C23 ...

Page 15

... B EQ (17 pin M/H 70µ control complied with (A DECK) 120µs 70µs (B DECK) (B DECK) , Metal CrO (Type II) Metal (Type IV 1.7 times normal speed 1.7 times normal speed –7dB attenuation Mute OFF 2.0V 3.5V VCH Vcc Mute ON Mute OFF OFF ON —15— CXA1897Q ...

Page 16

... Dolby B noise reduction 1) Dolby NR input mode MODE (27 pin) Input Rec In (7, 30 pin) Dolby NR Encoding 2) Dolby NR ON/OFF/ 1.7 NRSW (10 pin) L Dolby (9, 28 pin) Decoding M H OFF 1.7 —16— CXA1897Q ...

Page 17

... 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. No signal detected H When the pins have been connected as shown on the left figure, Vcc Low : Approximately 0.3V (V High : Vcc (V) GND } 5 5µA Compare 10 6 — 1 —17— CXA1897Q (sat) voltage) CE ...

Page 18

... REC IN1 D R OUT1 –6dB MPX GND GND GND GND GND GND GND 12mH 180p —18— CXA1897Q 22k 5.6k 24 2.2 /25V 0.47 23 2.2 /25V 27k 22 27k 4.7 /25V FP CAL 21 GND 10k 150p SPEED 20 180p 820p NORM/HIGH 2.2 /25V PB 10k 19 Bias 12mH 2.2 /25V OSC ...

Page 19

... Play back equalizer total harmonic distortion V = =2.7k L MODE 120 s-NS 1.0 f=1kHz 0.1 –10 0 –30 500 10k 20k Frequency (Hz) —19— CXA1897Q AGC OFF AGC ON –30 –20 –10 0 Input level (dBm) –25 –20 –15 –10 –5 Output level (dBm 50k ...

Page 20

... Frequency (Hz) B type encode characteristics 10 V =8V CC 0dB=Dolby Level =–10dBm 100 200 500 Frequency (Hz) 120 s-NS 120 s-HS 70 s- 10k 20k 50k 10k 20k 50k –40dB –30dB –20dB –10dB 0dB 10k 20k —20— CXA1897Q + 4.7 0.015 M + 100k ...

Page 21

... V –80 MODE : NORM-NORM –90 0dB=1kHz, +8dB f=1kHz 0.0 1.0 2.0 3.0 4.0 5.0 6.0 REC MUTE pin voltage (V) B type total harmonic distortion V =8V CC Encode Mode, R =10k L 0dB=Dolby Level 100Hz 1.0 1kHz 10kHz 0.1 0.01 –10 – Output level (dB) —21— CXA1897Q =8V CC (Tape) (Speed) ...

Page 22

... This product uses S-PdPPF (Sony Spec.-Palladium Pre-Plated Lead Frame). 48PIN QFP (PLASTIC 0.15 0.3 – 0.1 0. 0.35 2.2 – 0.15 PACKAGE STRUCTURE PACKAGE MATERIAL LEAD TREATMENT QFP-48P-L04 LEAD MATERIAL QFP048-P-1212 PACKAGE MASS —22— CXA1897Q + 0.1 0.15 – 0.05 0.15 + 0.2 0.1 – 0.1 EPOXY RESIN SOLDER / PALLADIUM PLATING 42/COPPER ALLOY 0.7g ...

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