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PDF CXA1878Q Data sheet ( Hoja de datos )
| Número de pieza | CXA1878Q | |
| Descripción | Dolby B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier | |
| Fabricantes | Sony Corporation | |
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CXA1878Q
Dolby∗ B-C Type Noise Reduction System with Recording/Playback Equalizer Amplifier
Description
The CXA1878Q is a bipolar IC with a built-in Dolby
B-C type noise reduction system (NR), Dolby S type
select switch, recording/playback equalizer, electronic
volume, and bias control circuit.
Use of this IC in combination with two CXA1417S/Q
completes a Dolby B-C-S type NR stereo system.
64 pin QFP (Plastic)
Features
• Dolby B-C type NR
• Built-in filter required for recording/playback equalizer
amplifiers
• Recording mute function
(requiring only an external time constant circuit to
implement soft mute)
• Fade in/out DC controllable
• NORM/CrO2/METAL tape mode switching function
• NORM/HIGH tape speed switching function
• DC controllable for recording level calibration
(approximately ±6dB variable)
• DC controllable for high frequency equalizer
amplifier gain (approximately ±4dB variable)
• Playback deck A/B select switch
• Recording volume control
• Bias control circuit
• Meter circuit
Structure
Bipolar silicon monolithic IC
Absolute Maximum Ratings
• Supply voltage
VCC 17
V
• Operating temperature
Topr –20 to +75 °C
• Storage temperature
Tstg –65 to +150 °C
• Allowable power dissipation PD
1020 mW
Operating Conditions
Supply voltage
(VCC • VEE) ±6.5 to 8.0 V
Applications
Recording/playback equalizer amplifier for stereo
analog cassette decks
(Applicable to ALPS ELECTRIC CO., LTD.
HADKH55 series heads)
∗ 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–
E95933A5Z-PK
1 page  
Pin
No.
Symbol
Typical pin voltage
I/O Z (in)
DC AC
Equivalent circuit
CXA1878Q
Description
9
43
REC OUT1
REC OUT2
0.0V
–3dBv
O
—
200
50k
9
43 200
Recording equalizer
amplifier output
10 IREF
VEE
+1.2V — — —
192
10
6k
11 NR IREF
VEE
+1.2V
—
—
—
8k 40k
11
Reference current
setting for built-in
recording/playback
equalizer amplifier
∗ The reference current
can be set by
connecting a resistor
between this pin and
VEE.
Reference current
setting for built-in Dolby
NR
∗ The reference current
can be set by
connecting a resistor
between this pin and
VEE.
12 MT C1
40 MT C2
14k
0.0V — O — 12
40
300
DC cut capacitance
300
–5–
5 Page 
Pin
No.
Symbol
Typical pin voltage
I/O Z (in)
DC AC
Equivalent circuit
CXA1878Q
Description
41 CAL IN
0.0V –26dBv I 10kΩ
10k
41
GND
1.5k
Calibration signal input
42 REC MUTE — — I —
42
Recording mute
ON/OFF selection
∗ The recording mute is
30k controlled with DC
voltages of 0 to 5V.
High: Recording mute OFF
GND
Low : Recording mute ON
∗ Soft mute and fader
functions can be set by
changing the time
constant of the external
time constant circuit.
64
52
VOL OUT1
VOL OUT2
0.0V –10dBv
O
500
64
52 500
5p
Recording volume
amplifier output
6.5k
63 VOL IN1
53 VOL IN2
0.0V –10dBv I 50kΩ
63
53
Recording volume
amplifier input
– 11 –
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CXA1878Q.PDF ] | |
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