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PDF BH7775K Data sheet ( Hoja de datos )
| Número de pieza | BH7775K | |
| Descripción | VCR audio signal processing system | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BH7775K (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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Video ICs
VCR audio signal processing system
BH7775K
The BH7775K is an audio signal processing system IC that includes a peak-noise reduction (PNR) processor, an FM
modulator / demodulator circuit, an input / output switcher, an automatic FM detector circuit, an FM band-pass filter,
a normal-audio circuit, a regulator circuit, and automatic adjusting circuits (VCO and BPF).
•Applications
VHS Video cassette recorders
•Features
1) Operates off dual ± power supply which allows a
large reduction in the number of coupling capacitors
required. A built-in regulator makes it easy to con-
struct a power supply system.
2) A built-in 2-wire serial control decoder circuit allows
serial control of the internal mode settings.
3) Automatic adjusting VCO and BPF circuits that use
the color signal subcarrier frequency (NTSC:
3.579545MHz and PAL: 4.433619MHz) ensure sta-
ble adjustment that is not effected by stress when
the chip is mounted, or variations over time.
4) 4-input switcher (turner, BS, and line 1 and 2).
Output switch with built-in STEREO / LEFT / RIGHT
switching, Hi-Fi / MIX / NORMAL switching, and BS
monitor functions.
5) The PNR processor and FM modulation / demodula-
tion circuit provide reverse characteristics at record-
ing and playback. Also, carrier frequency adjustment
and FM de-emphasis / playback level adjustment
have been combined.
6) Built-in FM band-pass filter connects directly to the
playback amplifier and excels at attenuation of the
other channel. The FM recording output circuit has a
high-performance high-frequency cutoff filter that
produces a sine wave output.
7) Switching noise is reduced by a slope-control type
differential compensation circuit.
8) Built-in envelope detector circuit and noise-detecting
automatic FM detector circuit.
9) Built-in normal-audio signal processing circuit that
allows SP / LP / EP equalizer switching. Control ter-
minal provided for use with the BA7755AF high-volt-
age head switcher.
1
1 page  
Video ICs
Pin function - 2 / 2
Pin No.
39
Pin name
NA FB
40 NA ALC
41 NA PB IN
42 NA PB OUT
43 PB EQ
44 NA PB NFB
45 GNN
Function
Normal line amplifier feedback.
Normal line amplifier ALC time constant setting
(attack and recovery time).
Normal line amplifier playback input.
Normal PB amplifier output.
Normal PB amplifier equalizer switch.
Normal PB amplifier feedback.
Normal audio GND.
46
NA HEAD IN
Normal audio playback input.
47
HEAD EQ
Head resonance equalizer switch terminal.
48
NA REC OUT
Normal REC amplifier output.
49
REC EQ
Recording equalizer setting resistor terminal.
50
NA REC FB
Normal REC amplifier feedback terminal.
51
MIX ALC
ALC time constant setting for mixer amplifier
(attack and recovery time).
52
MIX OUT
Mixer amplifier output for RF converter.
54, 53
LINE OUT L, R
Line output
55 VCC VCC regulator.
56
ERP
VCC regulator error output.
57
GND
Output switch, regulator GND.
58
ERM
VEE regulator error output.
59 VEE VEE regulator
61, 60
LINE1 IN L, R
LINE 1 input (L and R).
63, 61
LINE2 IN L, R
LINE 2 input (L and R).
64
VREFP
VCC / 2 reference voltage. With power on detect
and precharge function.
∗ I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector.
All numerical values are standardized values.
BH7775K
Pin voltage
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
0.0V
– 5.0V
0.0V
0.0V
5.0V
5.0V
0.0V
– 5.0V
– 5.0V
0.0V
0.0V
2.5V
I / O circuit
800Ω
EF (NPN) ~ 500Ω
105.2kΩ
EF (P-P) ~ 50Ω
OPEN / 25Ω
B (NPN)
—
REC: B (NPN)
REC: EF (P-P)
300kΩ / 29Ω
EF: (P-P)
1kΩ
B (NPN)
EF (NPN) ~ 500Ω
EF (NPN)
330Ω
—
C (NPN)
—
C (PNP)
—
90.2kΩ
90.2kΩ
10kΩ
5
5 Page 
Video ICs
BH7775K
Parameter
Symbol Min. Typ. Max. Unit
Conditions
[NORMAL PB AMP] (INPUT: NA HEAD IN, OUTPUT: LINE OUT)
Output voltage level
Distortion
Output residual noise
Open loop gain
(PB PRE AMP)
VOPSN
THDPBN
VONPBN
– 13.4
—
—
– 11.6
0.19
– 63.6
– 9.8
0.40
– 55.0
GVPBNOR
58.0
66.7
—
dB
%
dBV
dB
VIN = – 70dBV
VIN = – 70dBV,∗1
Rg = 1k Ω,∗2
VIN = – 70dBV
OUTPUT: NA PB OUT
[EQ SWITCH]
REC FB resistance SP
RREC SP 8.3 10.0 11.7 kΩ SP MODE
REC FB resistance EP
RREC SP
40.7
49.0
57.3
kΩ EP MODE
REC EQ resistance
RREC EQ
0.83
1.00
1.17
kΩ Resistor connected between pin 49 and GND.
PB EQ SW impedance
REQ PB
—
25
50
Ω SP MODE
HEAD EQ SW impedance REQ HEAD
—
29 50
Ω EP MODE
[RHS CONTROL]
RHS control current
IIN RHS
98
118 140
µA
RHS control leakage current IL RHS — — 1 µA
[PNR ENCODE MODE]
Encode output level
VOENC – 17.0 – 15.7 – 14.4 dBV Input condition 1
Compression characteristic
Encode distortion
Output residual noise
CMP – 26.4
THDEND
VONEC
—
—
– 24.7
0.17
– 56.5
– 23.0
0.37
– 51.5
dB
TU input VIN = – 20dBV→ – 70dBV
output level difference.
% Input condition 1,∗1
dBV Connect the pertinent input to GND,∗2
[PNR DECODE MODE]
Output voltage level
VODEC – 11.2 – 9.4 – 7.6
dBV VIN = – 15.7dBV
Expansion characteristic
EXP – 52.4 – 50.2 – 48.0
dB VIN = – 15.7dBV→ – 40.7dBV
output level difference.
Time constant setting resistor RDET
5.10 6.15 7.20
kΩ
Resistance value connected between pins 13 and
36 and VEE. (when VCCS and VEES applied)
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BH7775K.PDF ] | |
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