Datasheet BH7775K Datasheet (ROHM)

1

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 con­struct 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 sta­ble 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 / demodula­tion 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 ter­minal provided for use with the BA7755AF high-volt­age head switcher.

2

Video ICs BH7775K

•

Absolute maximum ratings (Ta = 25°C)

Parameter Symbol Limits Unit

V

CC

23, 55 pin · · · · · · · · · · 6.0

V

V

EE

59 pin · · · · · · · · · · · · – 6.0

V

V

IN 7, 8, 22 pin · · · · · · · · · 6.5 V

V

IN V

Pd mW
Topr – 10 ~ + 70 °C
Tstg – 55 ~ + 125 °C

Pin other than above

· · · · 6.0

Applied voltage

Power dissipation
Operating temperature
Storage temperature

∗

When IC is stand alone, reduced by 8.0mW for each increase in Ta of 1°C over 25°C. When mounted on a

90mm × 50mm, t = 1.6mm glass epoxy board, Pd = 1.3W (reduced by 13.0mW for each increase in Ta of

1°C over 25°C).

䊊

Not designed for rediation resistance.

800

∗

•

Recommended operating conditions (Ta = 25°C)

Power supply voltage
Power supply voltage

∗

The built-in regulator in this IC outputs + 5.0V from pin 55, and - 5.0V from pin 59. The supply voltage range

given above is the voltage to be applied to UNREG V

CC and UNREG VEE pins in the measurement circuit to

obtain regulator output. Therefore, the upper limit of the voltage range is set by the externally connected
transistor that forms the regulator circuit, and not by the IC itself. Note, also, that the lower limit will change
depending on the value of the resistor connected between the collector and base of the transistor.

Parameter

UNREG-V

CC

V

+ 7.0 ~

∗

UNREG-VEE V

+ 7.0 ~

∗

Symbol Range Unit

3

Video ICs BH7775K

•

Block diagram

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

DC FB L

VCO f

0 ADJ L

DAC BF OUT L

GNML

FM PB IN

MUTE CTRL

VCB

BPF f

0 ADJ

FM ALC

RHS CTRL

AUDIO HEAD SW

PULSE IN

FM REC OUT

GNMR

DAC BF OUT R

VCO f0 ADJ R

DC FB R

NA REC OUT

HEAD EQ

NA HEAD IN

GNN

NA PB NFB

PB EQ

NA PB OUT

NA PB IN

NA ALC

NA FB

Hi-Fi IN R

Hi-Fi OUT R

NR TC R

WTNG1 R

WTNG2 R

NR EMPH R

BS R IN

BS L IN

TUNER R IN

TUNER L IN

TUNER M IN

GNDD

DATA

CLOCK

ENVE OUT / ADJ FLAG

/ Hi-Fi DET

FSC IN

Hi-Fi IN L

Hi-Fi OUT L

NR TC L

WTNG1 L

WTNG2 L

NR EMPH L

VREFP

LINE2 L IN

LINE2 R IN

LINE1 L IN

LINE1 R IN

V

EE

ERM

GND

ERP

Vcc

LINE OUT L

LINE OUT R

MIX OUT

MIX ALC

NA REC FB

REC EQ

64

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

12345678910111213141516

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

RECAMP
REC EQ

EQ

EQ

PB

MIX

AMP

AMP

OUTPUT
SWITCH

SW

ATT

LINE
AMP

LINE
AMP

REC

INPUT

SWITCH

DATA

DECODER

PNR

MODEM

ENVE
LOPE

FM BPF

D.O.

COM.

Hi-Fi
DET

MODEM

PNR

ALC

4

Video ICs BH7775K

•

Pin descriptions

I / O circuitPin voltagePin name Function

3kΩ (2.5V Min.)

BS input (L and R).
TUNER input (L, R, and M).
Serial control GND.
Serial control data input.
Serial control clock input.
FM input Lch signal component envelope output.

Hi

-Fi DET output for FM input. ADJ FLAG output for ADJ.

fsc input terminal for VCO and BPF adjustment.
Hi

-Fi input for output switcher.

PNR audio output.
PNR attack and recovery time setting. Attack

R: 530

Ω, recovery R: 6.5kΩ.

Waiting characteristic low-frequency time constant setting
Waiting characteristic high-frequency time constant setting
NR emphasis time constant setting.

(external C = 0.01

µF)

PNR operating reference potential.
VCO control current setting terminal.
VCO control DAC voltage output terminal .

PNR, MODEM and BPF GND. L and R unconnected.

FM BPF center frequency adjustment.
FM ALC time constant setting.

Note) I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector.

All numerical values are standardized values.

Playback FM input. 660mVP-P Typ.
No input coupling capacitor (GND to V

CC).

Line output mute control input.
MODEM and BPF V

CC.

High-voltage head switch (BA7755) control terminal.
Audio head switching pulse input.

EE: recording FM output. Sine wave output.
PB: BPF output monitor terminal.

Pin No.

2, 1 BS IN L, R 0.0V 69.8kΩ

4, 3, 5 TUNER IN L, R, M 0.0V 47.0kΩ

6 GNDD 0.0V —
7 DATA IN — B (PNP)
8 CLOCK IN — B (PNP)

10 FSC IN 0.0V 200kΩ
11, 38 Hi-Fi IN L, R 0.0V 47kΩ
12, 37 Hi-Fi OUT L, R 0.0V EF: (P-P)

14, 35 WTNG1 L, R 0.0V 10kΩ
15, 34 WTNG2 L, R 0.0V 1.1kΩ

17, 32 DC FB L, R 0.0V 11.5kΩ
18, 31 VCO f

0 ADJ L, R 2.5V EF (NPN)

19, 30 VCO DAC BF OUT L, R 1.4V EF (NPN)

22 MUTE CTRL —

23 VCB 5.0V —

26 RHS CTRL — C (NPN)

24 BPF f

0 ADJ 1.9V EF (NPN) ~ 200Ω

27 AHSWP IN — B (PNP)

28 FM REC OUT

EE: 3.3V
PB: 3.3V

EF (NPN) ~ 200Ω

9

ENVE OUT / Hi-Fi DET

/ ADJ FLAG

EE: 0.8V
PB: 1.0V

EE: 50kΩ

PB, ADJ: EF (NPN)

13, 36 NR TC L, R – 5.0V —

16, 33 NR EMPH L, R 0.0V —

20, 29 GND (GNM) L, R 0.0V —

21 FM PB IN 0.0V 50kΩ

25 FM ALC 0.0V EF (NPN) ~ 2.5kΩ

Pin function - 1 / 2

5

Video ICs BH7775K

∗

I / O circuit; EF: emitter follower, P-P: push pull, B: base, and C: collector.

All numerical values are standardized values.

Pin name Function Pin voltage

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.

Normal audio playback input.
Head resonance equalizer switch terminal.

Normal REC amplifier output.
Recording equalizer setting resistor terminal.
Normal REC amplifier feedback terminal.
ALC time constant setting for mixer amplifier

(attack and recovery time).
Mixer amplifier output for RF converter.
Line output
V

CC regulator.

V

CC regulator error output.

Output switch, regulator GND.
V

EE regulator error output.

VEE regulator
LINE 1 input (L and R).
LINE 2 input (L and R).

V

CC / 2 reference voltage. With power on detect

and precharge function.

I / O circuit

Pin No.

39 NA FB 0.0V 800Ω

41 NA PB IN 0.0V 105.2kΩ

42 NA PB OUT 0.0V EF (P-P) ~ 50Ω

43 PB EQ 0.0V OPEN / 25Ω

44 NA PB NFB 0.0V B (NPN)

45 GNN 0.0V —

47 HEAD EQ 0.0V 300kΩ / 29Ω

48 NA REC OUT 0.0V EF: (P-P)

49 REC EQ 0.0V 1kΩ

50 NA REC FB 0.0V B (NPN)

52 MIX OUT 0.0V EF (NPN)
54, 53 LINE OUT L, R 0.0V 330Ω

55 V

CC 5.0V —

56 ERP 5.0V C (NPN)

57 GND 0.0V —

58 ERM – 5.0V

– 5.0V

C (PNP)

59 V

EE —

61, 60 LINE1 IN L, R 0.0V 90.2kΩ
63, 61 LINE2 IN L, R 0.0V 90.2kΩ

64 VREFP

2.5V

10kΩ

40

NA ALC 0.0V EF (NPN) ~ 500Ω

46

NA HEAD IN 0.0V

REC: B (NPN)
REC: EF (P-P)

51

MIX ALC – 5.0V EF (NPN) ~ 500Ω

Pin function - 2 / 2

6

Video ICs BH7775K

•

Input / Output circuits

Equivalent circuits for the control and input / output circuits - (1)

4 61

47k

– 2.0V

2.0V

[3, 5pin]

Vcc

V

EE

GND

Vcc

V

EE

GND

[60, 63,

62pin]

60.2k

30k

2.0V

– 2.0V

2

54

Vcc

V

EE

GND

Vcc

V

EE

GND

[1pin]

22.8k

47k

2.0V

– 2.0V

330

10.13k

25k

26k

30k

50

50

[53pin]

28

52

Vcc

V

EE

GND

Vcc

V

EE

GND

200

200

5p

8k

5k

200

200

47k

TUNER L, R, M (4, 3, 5pin)

BS L, R (2, 1pin)

MIX OUT (52pin)

LINE1 L / R, LINE2 L / R (61, 60, 63, 62pin)

LINE OUT (54, 53pin)

FM REC OUT (28pin)

7

Video ICs BH7775K

Equivalent circuits for the control and input / output circuits - (2)

FM PB IN (21pin)

NA PB OUT (42pin)

NR REC OUT (48pin), NA REC NFB (50pin)

NA PB IN (41pin)

NA PB NFB (44pin), NA HEAD IN (46pin)

21

41

Vcc

V

EE

GND

Vcc

V

EE

GND

3.5V

50k

12.5k

20p 2k

100k

EEPB

30k

75.2k

PB

42

44

46

Vcc

V

EE

GND

100k

200

200

50

Vcc

V

EE

50

48

Vcc

V

EE

GND

200

200

50k

39k

10k

SP: ON

8

Video ICs BH7775K

Equivalent circuits for the control and input / output circuits - (3)

AUDIO HEAD SWITCH PULSE IN (27pin)

RHS CTRL (26pin)

DATA (7pin), CLOCK (8pin) FSC IN (10pin)

ENVELOPE / Hi-Fi DET OUT (9 pin)

MUTE CTRL (22pin)

27

9

Vcc

V

EE

GND

Vcc

V

EE

GND

5k

30k 30k

PB

200

50k

26

22

Vcc

V

EE

GND

Vcc

V

EE

GND

5k

51k

16k

10k

3k

50k

10k

200

2.5V

8

10

Vcc

V

EE

Vcc

V

EE

GND

3V

10k

[7pin]

50k

200k

2k

9

Video ICs BH7775K

•

Electrical characteristics

• Unless otherwise noted, the following measurement conditions apply:

UNREG – V

CC = + 10V

UNREG – V

EE = – 10V

Ta = 25°C
∗ With regard to the control voltages, refer to the mode holding voltage range given in p.141.

Output switch control (W1 bit 4, W1 bit 3 and W1 bit 2) STEREO
BS Through control (W1 bit 1) : OFF
LINE AMP gain (W3 bit 4 and W3 bit 3) : Standard ( + 10.6dB)
FM output control (W2 bit 5) : FM output on
FM OUT switch control (W2 bit 4, W2 bit 3 and W2 bit 2) : FM REC output MIX ration ( – 10.0dB)
NTSC / PAL control (W2 bit 0) : NTSC
Recording MUTE (W2 bit 1) : Recording MUTE
SP / EP control (W1 bit 5) : SP
FM detector level control (W4 bit 7, W4 bit 6) : Standard
ENVE characteristic control (W4 bit 5, W4 bit 4) : FNORM detector, no ENVE output
MUTE CTRL (pin 22) : L (MUTE)
LINE MUTE (W1 bit 0) : L (MUTE)

MODEM carrier frequency NTSC L channel 1.30MHz, PAL Lch 1.40MHz
MODEM carrier frequency NTSC R channel 1.70MHz, PAL Rch1.80MHz
Color signal subcarrier frequency NTSC 3.579545MHz, PAL 4.433619MHz

Signal frequency f = 1kHz

• Input condition 1 TU input V

IN = – 20.0dBV, LINE1 / LINE2 input VIN = – 10.0dBV, BS input VIN = – 16.0dB

• Input condition 2 TU input V

IN = – 10.6dBV, LINE1 / LINE2 input VIN = – 0.6dBV, BS input VIN = – 6.6dB

• Input condition 3 TU input V

IN = – 15.0dBV, LINE1 / LINE2 input VIN = – 5.0dBV, BS input VIN = – 11.0dB

• Input condition 4 TU input V

IN = – 5.0dBV, LINE1 / LINE2 input VIN = + 5.0dBV, BS input VIN = – 1.0dB

∗ 1 B.W. = 0.4 to 30kHz ∗ 2 DIN AUDIO
∗ Refer to Fig. 1 for the measurement circuit.

Regulator input voltage (–)

Parameter Symbol Min. Typ. Max. Unit Conditions

I

qp EE 29.0 38.6 51.3 mA

Iqp PB 40.3 53.7 71.4 mA

IqM EE – 22.1 – 16.6 – 12.5 mA

IqM PB – 23.9 – 18.0 – 13.5 mA

[REGULATOR]

V

CC

4.69 5.39

V

5.04

V

EE – 5.37 – 4.67 V– 5.02

EE mode, no input, after carrier
frequency adjustment.

Regulator input voltage (+)

Quiescent Current
(positive supply) EE

Quiescent Current
(positive supply) PB

Quiescent Current
(negative supply) EE

Quiescent Current
(negative supply) PB

PB mode, no input, FNORM, BPF,
after carrier frequency adjustment.

EE mode, no input, after carrier
frequency adjustment.

PB mode, no input, FNORM, BPF,
after carrier frequency adjustment.

10

Video ICs BH7775K

∆VMODE — 8.0 22 mV

V

OMIX – 10.6 – 9.4 – 8.2 dBV

THD

MIX — 0.08 0.50 %

V

OBS – 10.5 – 8.1 dBV– 9.3

THD

BS — 0.08 %0.006

V

ONBS — – 86.0 dBV– 96.0

V

OLINE1 + 10.0 + 11.2 dB+ 10.6

V

OLINE2 + 11.2 + 12.4 dB+ 11.8

V

OLINE3 + 13.1 + 14.3 dB+ 13.7

V

ALCMIX – 4.4 – 1.4 dBV– 2.9

VIN = – 16.0dBV
VIN = – 16.0dBV,

∗

1

V

IN = – 20.0dBV

V

IN = – 20.0dBV

V

IN = – 20.0dBV

Input condition 1, simultaneous L & R input
Input condition 1, simultaneous L & R input

∗

1

Input condition 2, simultaneous L & R input

∗

2

, Connect BS IN to GND.

[LINE AMP] (INPUT: Hi-Fi IN L / R OUTPUT: LINE OUT L / R)

Input condition 1
Input condition 1,

∗

1

Rg = 1kΩ,

∗

2

Input condition 4
Input condition 4,

∗

1

Input condition 1
Input condition 1,

∗

1

THD = 1%,

∗

1

, ALC OFF

Input condition 2,

∗

2

, EE MODE, ALC OFF

[NORMAL REC AMP]

MT

RECN — – 94.0 – 70.0 dBV

(INPUT: TU IN M, TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R OUTPUT: NA REC OUT)

V

OEE – 11.6 – 9.2 dBV– 10.4

THD

EEN — 0.10 %0.039

V

ONEEN — – 71.3 dBV

– 81.5

V

ALCN1 – 8.9 – 5.9 dBV– 7.4

THD

ALCN —

0.15

%

0.045

V

ORECN – 9.6 –6.6 dBV– 8.1

THD

RECN — 0.20 %0.079

V

OMRCN 7.0 — dBV9.2

(INPUT: TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R OUTPUT: MIX OUT)

[MIX AMP]

(INPUT: TU IN M, TU IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R OUTPUT: LINE OUT L / R)

[NORMAL EE THROUGH]

Parameter Symbol Min. Typ. Max. Unit Conditions

CTEE

——

– 75.0 dBV

[Hi-Fi EE THROUGH]

〈MANUAL MODE〉

V

OEE – 10.6 – 8.2 dBV– 9.4

CB

EE – 0.8 0.8 dB0.0

THD

EE — 0.10 %0.017

V

OMEE 9.0 — dBV10.7

V

ONEE — – 86.0 dBV– 93.0

MTEE

— – 95 dBV– 105

Input condition 1
Input condition 1
Input condition 1

∗

1

THD = 1%,

∗

1

Relevant input shorted to GND,

∗

2

Input condition 2

∗

2

(LINE OUT)
ST / L / R / N, MIX ON / OFF
Mode switching operating point voltage difference.

(INPUT: TU IN L / R, LINE1 IN L / R , LINE2 IN L / R, BS IN L / R OUTPUT: LINE OUT L / R)

Relevant input: shorted to GND
Non-relevant input: Input condition2,

∗

2

Switching DC offset

Line output level
Channel balance (L / R)
Distortion
Maximum output level
Output residual noise

Crosstalk
Muting level

Output level
Distortion
Output residual noise

Line amplifier gain 1
Line amplifier gain 2
Line amplifier gain 3

Output level
Distortion
MIX ALC level

Output voltage level
Distortion
Output residual noise
ALC level 1
ALC distortion

Output voltage level
Distortion
Maximum output level
Output level for EE

[BS THROUGH] (INPUT: BS IN L / R OUTPUT: LINE OUT L / R)

11

Video ICs BH7775K

[NORMAL PB AMP] (INPUT: NA HEAD IN, OUTPUT: LINE OUT)

[EQ SWITCH]

[PNR ENCODE MODE]

[PNR DECODE MODE]

Encode output level
Compression characteristic
Encode distortion

Output residual noise

Output voltage level
Expansion characteristic

Time constant setting resistor

Output voltage level
Distortion
Output residual noise

Open loop gain
(PB PRE AMP)

REC FB resistance SP
REC FB resistance EP
REC EQ resistance
PB EQ SW impedance
HEAD EQ SW impedance

RHS control current
RHS control leakage current

[RHS CONTROL]

G

VPBNOR

VOPSN

THDPBN

VONPBN

RREC SP
RREC SP
RREC EQ

REQ PB

REQ HEAD

IIN RHS

IL RHS

CMP

EXP

R

DET

THDEND

VONEC

VODEC

VOENC

58.0

– 13.4

—
—

8.3

40.7

0.83
—
—

98
—

– 26.4

– 52.4

5.10

—
—

– 11.2

– 17.0

66.7

– 11.6

0.19

– 63.6

10.0

49.0

1.00
25
29

118

—

– 24.7

– 50.2

6.15

0.17

– 56.5

– 9.4

– 15.7

—

– 9.8

0.40

– 55.0

11.7

57.3

1.17
50
50

140

1

– 23.0

– 48.0

7.20

0.37

– 51.5

– 7.6

– 14.4

dB

dB

%

dBV

kΩ
kΩ
kΩ

Ω
Ω

µA
µA

dB

dB

kΩ

%

dBV

dBV

dBV

V

IN = – 15.7dBV

Input condition 1
TU input V

IN = – 20dBV→ – 70dBV

output level difference.
Input condition 1,

∗

1

Connect the pertinent input to GND,

∗

2

VIN = – 15.7dBV→ – 40.7dBV
output level difference.

Resistance value connected between pins 13 and
36 and VEE. (when VCCS and VEES applied)

VIN = – 70dBV
OUTPUT: NA PB OUT

V

IN = – 70dBV

V

IN = – 70dBV,

∗

1

Rg = 1k Ω,

∗

2

SP MODE
EP MODE

SP MODE
EP MODE

Resistor connected between pin 49 and GND.

Parameter Symbol Min. Typ. Max. Unit Conditions

12

Video ICs BH7775K

PB mode: Input FM PB IN = 660mV

P-P

, f = 1.30MHz, 1.70MHz 1: 1 MIX, after BPF center frequency adjustment. Inpu

DEV = DEV

L,R

(frequency deviation given above). EE / PB line out level difference.

EE mode: VIN = – 10.0dBV after carrier
frequency adjustment.

Demedulation output
level

Demedulation output
level 2

Demedulation distortion

Demedulation SW
noise level

Demedulation noise
level

Line output recording /
playback level
difference

DEVL = ± 50.0kHz, f = 10kHz

DEV

R = ± 50.0kHz, f = 10kHz

DEV

L = ± 50.0kHz, f = 1kHz

DEV

R = ± 50.0kHz, f = 1kHz

DEV

L = ± 50.0kHz, f = 1kHz,

∗

1

DEV

R = ± 50.0kHz, f = 1kHz,

∗

1

f = 10kHz, AUDIO H. SW. P = – Hz
5V

P-P rectangular-waveform input. After

10kHz TRAP passes DEV. = ± 25.0kHz

∗

2

Unmodulated

∗

2

Parameter Symbol Min. Typ. Max. Unit Conditions

V

ODL2

VODR2

VODR VODR

VODR

– 5.0

dBV

V

ODL VODL VODL

– 5.0

dBV

(INPUT: TUNER IN L / R, LINE1 IN L / R, LINE2 IN L / R, BS IN L / R, OUTPUT: FM REC OUT L / R)

V

RPR – 1.2 + 1.2 dB

0.0

V

RPL

Rch

Lch – 1.2 + 1.2 dB

0.0

f

NOLLch 1.2950 1.3050 MHz

1.3000

f

NORRch 1.6950 1.7050 MHz

1.7000

f

POLLch 1.3945 1.4055 MHz

1.4000

f

PORRch 1.7935 1.8045 MHz

1.7990

DEVL 45.5 57.5 ± kHz

51.5

DEV

R 45.0 57.0 ± kHz

51.0

DEV

Max.L 116 160 ± kHz

138

DEV

Max.R 116 160 ± kHz

138

VOFML 320 420 mVP-P

365

VOFMR

Lch
Rch
Lch
Rch
Lch
Rch 325 425 mV

P-P

370

f

2L — – 40.0 dB

– 53.0

f

2R — – 40.0 dB

– 48.0

f

3L — –40.0 dB

– 52.0

f

3R

Lch
Rch
Lch
Rch — –42.0 dB

– 55.0

f

LR – 12.0 – 8.4 dB

– 10.2

V

ODL – 11.5 – 7.1 dBV

– 9.3

V

ODR – 11.5 – 7.1 dBV

– 9.3

THD

DL — 0.35 %

0.12

THD

DR

Lch

Rch

Lch
Rch

Lch
Rch — 0.35 %

0.13

V

ODSWL — — dBV

—

V

ODSWR — — dBV

—

V

ONDL — – 85.0 dBV

– 95.0

V

ONDR

Lch
Rch

Lch
Rch — – 85.0 dBV

– 95.0

Carrier frequency
NTSC

Carrier frequency
PAL

Frequency deviation

Maximum frequency
deviation

FM output level

Carrier 2nd harmonic

Carrier 3rd harmonic

FM MIX ratio (FM MIX1 mode)

No input, V

CC

stable, after automatic adjustment

f

SC =

3.579545MHz

V

IN =

150 ~ 500mV

P-P

No input, VCC stable, after automatic adjustment
f

SC =

4.433619MHz

V

IN =

150 ~ 500mV

P-P

FM OUT SW: FM L mode
FM OUT SW: FM R mode
2nd stage harmonics and fundamental harmonics

spectral ratio Lch: FM L mode, Rch: FM R mode
3rd stage harmonics and fundamental harmonics

spectral ratio Lch: FM L mode, Rch: FM R mode

Input condition 1

Input condition 4 (f

=

10kHz)

1.3MHz / 1.7MHz spectrum ratio.

[MODEM REC MODE]

[MODEM PB MODE] (INPUT: FM PB IN, OUTPUT: LINE OUT L / R)

Carrier frequency, after BPF fo adjustment, V

IN = 660mVP-P, 1.30MHz, 1.70MHz MIX IN

[Recording→ playback total characteristics] (EE · · · INPUT: LINE IN L / R, OUTPUT: LINE OUT L / R)

(PB · · · INPUT: FM PB IN, OUTPUT: LINE OUT L / R)

– 10.0

– 10.0

– 7.5

– 7.5

13

Video ICs BH7775K

ATTNL

1.15

ATT

NLC

– 9.5

ATTNLC
– 5.0

ATTNLC

– 2.0

dB

1.15MHz + 1.70MHz

ATT

NL

1.45

ATT

NLC

– 8.6

ATTNLC
– 5.0

ATTNLC

– 2.0

dB 1.45MHz + 1.70MHz

ATT

NL

1.70

——

ATT

NLC

– 30.0

dB

1.30MHz + 1.70MHz

f = 1.505MHz, V

IN = 200mVP-P

∆VBPFN – 5.0 5.0 dB

0.0
f = 1.605MHz, V

IN = 200mVP-P

∆VBPFP – 5.0 5.0 dB

0.0

〈NTSC Lch〉

1.30MHz + 1.70MHz

ATT

NLC – 14.2 – 8.1 dB

– 11.1

ATT

NR

1.55

ATT

NRC

– 8.3

ATTNRC

– 4.7

ATTNRC

– 1.9

dB

1.55MHz + 1.30MHz

ATT

NR

1.85

ATT

NRC

– 10.6

ATTNRC

– 5.4

ATTNRC

– 1.6

dB 1.85MHz + 1.30MHz

ATT

NR

1.30

——

ATT

NRC

– 30.0

dB

1.30MHz + 1.70MHz

〈NTSC Rch〉

1.30MHz + 1.70MHz

ATTNRC – 15.5 – 9.3 dB

– 12.3

ATT

PL

1.25

—

ATT

PLC

– 5.0

—

dB

1.25MHz + 1.80MHz

ATT

PL

1.55

—

ATT

PLC

– 5.2

—

dB 1.55MHz + 1.80MHz

ATT

PL

1.80

——

ATT

PLC

– 30.0

dB

1.40MHz + 1.80MHz

〈PAL Lch〉

1.40MHz + 1.80MHz

ATTPLC – 1.28 – 6.7 dB

– 9.7

ATT

PR

1.65

—

ATT

PRC

– 4.6

—

dB

1.65MHz + 1.40MHz

ATT

PR

1.95

—

ATT

PRC

– 5.3

—

dB 1.95MHz + 1.40MHz

ATT

PR

1.40

——

ATT

PRC

– 30.0

dB

1.40MHz + 1.80MHz

〈PAL Rch〉

1.40MHz + 1.80MHz

ATTPRC – 14.8 – 8.6 dB

– 11.6

[FM BPF] (INPUT: FMPB IN, OUTPUT: BPF MONITOR L / R) V

CC stable, after automatic adjustment

BPF L / R level difference NTSC
BPF L / R level difference PAL

1.30MHz insertion loss

1.15MHz attenuation

1.45MHz attenuation

1.85MHz attenuation

1.30MHz attenuation

1.40MHz insertion loss

1.25MHz attenuation

1.55MHz attenuation

〈LcH, RcH mix input signal〉 660mV

P-P (RATIO 1: 1), FM ALC ON

1.70MHz attenuation

1.70MHz insertion loss

1.55MHz attenuation

1.80MHz attenuation

1.80MHz insertion loss

1.65MHz attenuation

1.95MHz attenuation

1.40MHz attenuation

Parameter Symbol Min. Typ. Max. Unit Conditions

14

Video ICs BH7775K

Parameter Symbol Min. Typ. Max. Unit Conditions

V

DDO 77.0 83.0 89.0 dBµ

τ

FNDLY 110 125 140 ms

V

THHOLD 1.66 2.66 3.66 V

V

ENVSP0 — 100 mV0

V

ENVSP1 2.22 3.22 V2.72

V

ENVSP2 3.70 4.20 V3.95

V

ENVEP1 2.18 3.18 V2.68

V

HDETL — 100 mV0

V

HDETH 3.50 — V4.00

∆τ

HOLD 6.47 9.07 µs7.77

[DO detect circuit]

[FNORM to Hi-Fi return delay circuit]

[Hold pulse circuit]

Envelope output level SP0
Envelope output level SP1
Envelope output level SP2
Envelope output level EP1
Hi-Fi DET output DC FNORMAL
Hi-Fi DET output DC HiFi

FM PB IN (1.3MHz, 1.7MHz, 1: 1 MIX)
time from 660mV

P-P input to ENVE OUT

rise. Audio head pulse in: f = 30Hz,
5V

P-P rectangular waveform.

V

IN = 0dB, SP MODE

V

IN = + 10dB, SP MODE

V

IN = – 4dB, EP MODE

V

IN = 0dB

[Envelope output circuit] (INPUT: FM PB IN, OUTPUT: ENVE OUT)

0dB = 660mV

P-P, 1.3MHz & 1.7MHz MIX IN

〈CLOCK IN〉

V

H8L 0.0 0.5 V—

V

H8H 2.5 VCC V—

〈DATA IN〉

V

H7L 0.0 0.5 V—

V

H7H 2.5 VCC V—

MUTE CTRL

V

H22L 0.0 1.0 V—

V

H22H 3.9 VCC V—

L mode holding voltage
H mode holding voltage

L mode holding voltage
H mode holding voltage

MUTE holding voltage
DC MUTE holding voltage

[Voltage for preserving the control system mode]

No signal, SP MODE

Hysteresis (0.5V)

No signal

Input level to give DO due to attenuation.DO detector level

Return delay time

Audio head switch pulse
threshold voltage

Hold pulse width

15

Video ICs BH7775K

•

Measurement circuit

A

V

V

A

A

A

V

V

V

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33µ

0.01µ

0.022µ
33µ

0.01µ

0.022µ

4.7µ

3.3µ

47k

V

EE

Hi-FiINL

ENVEOUT/ADJFLAG

Hi-FiDET

10k

MUTE CTRL

FM PB IN

50

10k

25.3k

47k

27k

AUDIO

HEAD SWITCH PULSE IN

FM REC OUT

27k

47k

64

4.7µ

100µ

100µ

1500p

V

EE

VEE

UNREG VEE

VEE

1200p

NAME COUI

NAME AOIN

330k

0.01µ

0.1µ

100µ

33µ

3.3µ

10µ

V

EE

4.7µ

0.01µ

0.022µ

V

EE

1M

330

22µ

12k

0.2k

500

1k

0.01µ

UNREG V

CC

VCC

LINE OUT L

LINE OUT R

MIX OUT

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

12345678910111213141516

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

RECAMP

REC EQ

EQ

EQ

PB

MIX

AMP

AMP

OUTPUT

SWITCH

SW

ATT

LINE

AMP

LINE

AMP

REC

INPUT

SWITCH

DATA

DECODER

PNR

MODEM

ENVE

LOPE

FM BPF

D.O.

COM.

Hi-Fi

DET

MODEM

PNR

ALC

1k

FSCIN

CLOCK

DATA

TUNER M IN

1k

1k

1k

1k

1k

1k

1k

1k

1k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

22k

1500p

22k

22k

2.2M

47µ

TUNER L IN

TUNER R IN

BS L IN

BS R IN

LINE2 L IN

LINE2 R IN

LINE1 L IN

LINE1 R IN

22k

10µ

500

Fig.1

16

Video ICs BH7775K

•

Application example

BIAS

OSC

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33µ

0.022µ

33µ

0.01µ

0.022µ

4.7µ

3.3µ

VEE

ENVELOPE/Hi-Fi DET OUT/ADJ FLAG

MUTE CTRL

FM PB IN

25.3k

47k

27k

AUDIO HEAD SWITCH PULSE IN

P/R CTRL

FM REC OUT

27k

47k

64

4.7µ

100µ

100µ

1500p

V

EE

UNREG VEE

VEE

1200p

0.1µ

100µ

3.3µ

10µ

V

EE

4.7µ 0.01µ

0.022µ

V

EE

1M

330

330k

12k

22µ

0.01µ

8.2k

0.01µ

UNREG V

CC

VCC

LINE L OUT

LINE R OUT

MIX OUT

63

62

61

60

59

58

57

56

55

54

53

52

51

50

49

12345678910111213141516

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

RECAMP

REC EQ

EQ

EQ

PB

MIX

AMP

AMP

OUTPUT

SWITCH

SW ATT

LINE

AMP

LINE

AMP

REC

INPUT

SWITCH

DATA

DECODER

PNR

MODEM

ENVE

LOPE

FM BPF

D.O.

COM.

Hi-Fi

DET

MODEM

PNR

ALC

FSCIN

CLOCK

DATA

TUNER M IN

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k

4.7k 22k

1500p

2.2M

47µ

TUNER L IN

TUNER R IN

BS L IN

BS R IN

LINE2 L IN

LINE2 R IN

LINE1 L IN

LINE1 R IN

BA7755

1234

8765

33µ

10µ

Fig.2

17

Video ICs BH7775K

•

Electrical characteristic curve

FREQUENCY: f (MHz)

GAIN: GV (dB)

Lchannel

Rchannel

0.75

0.90 1.05 1.20 1.35 1.5 1.65 1.80 1.95 2.10 2.25

– 45

– 55

– 50

– 35
– 40

– 25

– 15

– 5

– 30

– 20

– 10

Fig. 3 FM BPF frequency characteristics (NTSC)

•

External dimensions (Units: mm)

0.15 ± 0.1

48 33

32

17

49

64

1

16

14.0 ± 0.2

16.4 ± 0.3

14.0 ± 0.2

0.35 ± 0.1

0.05

0.5

16.4 ± 0.3

0.8

2.7 ± 0.1

0.15

QFP-A64