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Video ICs
VIF / SIF signal processor for televisions and VCRs
BH7370FS
The BH7370FS is a VIF / SIF signal processor that supports the M mode (used in the U.S. and Japan). An application of BiCMOS process and active filter technology, this IC has been designed with an internal VCO, AFT, sound band-pass filter, sound-trap and FM demodulator circuit. And thanks to Rohm's original automatic adjustment technology, the digital AFT circuit, internal tank circuit and filter circuit are all adjustment-free.
*Applications and tuner blocks for multimedia devices TVs, LCD TVs, *Features adjustment-free IF tank coil and audio filter. 1) Internal
2) Digital AFT circuit, for highly precise, highly stable frequencies. 3) The reference signal input from the tuner fixed at 4MHz, eliminating the need for an oscillator. 4) No VCO coil is used, allowing for excellent resistance to magnetic noise. 5) A pulse count audio detector circuit with excellent S / N and linearity. 6) Internal B / W inverter circuit.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 650 - 15 ~ + 75 - 40 ~ + 150 Unit V mW C C
Reduced by 6.5mW for each increase in Ta of 1C over 25C.
*Operating conditions (Ta = 25C)
Parameter Power supply voltage Guaranteed operating power supply voltage Symbol VCC5V VCC Min. 4.7 4.5 Typ. 5.0 5.0 Max. 5.3 5.5 Unit V V
1
Video ICs
BH7370FS
*Block diagram
VIDEO - OUT AGC - FLT PLL - FLT EQ - FLT VCO - CONT Vo - 4.5M GND - D
N.C.
VCC
24
23
22
21
20
19
FS
18
17
16
15
AFC
14
VDD
EQ
B/W INV VIDEO AMP
x
AGC
PLL DET
+ 45 SHIFT - 45 SHIFT
F- COUNT
SIF TRAP SIF BPF
x
500k BPF LIM FM DEM
13
VCO
SOUND TRAP VIF AMP VIF AMP
x
500
RF AGC
REF FIL REF OSC
6 7 8 9
Digital AFT
100k
VDD
100k
AF AMP
10 11
AFT - FB
12
1
2
3
4
5
AFT - OUT
RF - AGC
OSC - IN
AF - OUT
AGC - ADJ
*Pin descriptions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 Pin name N.C. AGC - ADJ RF - AGC GND1 VIFA VIFB GND2 OSC - IN ECO AFT - OUT AF - OUT AFT - FB Function -- Adjusting the RF AGC delay point RF AGC output VIF GND VIFA input VIFB input SIF and VCO GND 4MHz oscillator input Reference filter detection AFT output Audio output FB pin for PLL-FLL
15 16 17 18 19 20 21 22 23 24 Vo - 4.5M GND - D VDD VCC FS PLL - FLT VIDEO - OUT EQ - FLT AGC - FLT N.C. 13 VCO - CONT Pin No. Pin name Function Switching between 45.75MHz (U.S.) and 58.75MHz (Japan) Audio detection filter and audio / video mute switch 2nd SIF output CMOS ground CMOS VDD Bipolar VCC F-counter output PLL phase detection FILTER VIDEO OUT EQ FILTER IF AGC FILTER -- 14 AFC
2
AFT - FB
GND1
GND2
N.C.
VIFA
VIFB
ECO
Video ICs
BH7370FS
*Input / output circuits
Pin No. 1 Pin name N.C. IN / OUT -- Voltage -- Equivalent circuit --
Vcc 5k 5k
Function Internally open
2
AGC - ADJ
--
0.2V (13k connection)
2
7.8k 4.5k GND Vcc 2k
Adjusting the RFAGC delay point. A fixed resistor (20k) is normally fixed between grounds. For greater precision, adjust with a variable resistor (50k).
3
RF - AGC
OUT
--
3
100
RF-AGC output (reverse). Because of open collector output, gain can be set with an attached resistor (the minimum value for pin 3's maximum sink current is 0.7mA). Pin 3 voltage should remain below 7 V.
GND
100k
4
GND1
--
0V
--
Vcc
Bipolar ground for the VIF, AGC and video system.
5 6
VIFA VIFB
1k
1k
IN
3.4V
5 6 7.4k 7.4k 750 GND
IF input. Use equilibrium input.
7
GND2
--
0V
--
Vcc
Bipolar ground for the SIF and VCO.
5k
5k
8
REF OSC - IN
IN
2V
8
20k 30k 38.9k
10k
4MHz reference oscillator input (input level = 25 - 100mVP-P, frequency precision = 0.1% or less)
GND Vcc 10k 10k 10k
9
ECO
--
2.2V
9 60p
1k
Reference filter detection output.
2.6V 10k 10k
16k GND VDD
100k 1k 1k
10
AFT - OUT
OUT
--
10
AFT output (CMOS output). VDD and the ground each have an internal 100k resistor. Output is 1 / 2VDD at the center frequency.
GND
100k
3
Video ICs
Pin No. Pin name IN / OUT Voltage Equivalent circuit
Vcc 80k 100 200 20k
BH7370FS
Function
11
AF - OUT
OUT
2.2V
11
Audio signal output. A de-emphasis constant should normally be attached.
5k
800 GND Vcc
12
AFTF - FB
OUT
--
10
1k 5k
The Lo range of the AFT curve can be expanded by feeding back to PLL--FIL.
12
GND Vcc 50k
20k
13
VCO - CONT
IN
--
13
20k
50k GND Vcc
Switching the internal VCO frequency. High = 45.75MHs (U.S.) (connect to Vcc) Low = 58.75MHz (Japan) (connect to ground)
14
AFC
--
2.2V
14
2k 500 60k
Automatic adjustment FB for the 500kHz pulse counter FM DEMO. Attach a capacitor (roughly 4.7F). Lowering this pin below 0.3V Mutes Audio and Video.
GND Vcc 500
5.66p 2k
15
VO - 4.5M
--
2.4V
15
500 500
11.3p
2nd SIF output. Sound Filter characteristics can be changed by connecting this pin to the TRAP. To reduce color buzzing, attach a 3.5MHz trap. Internal impedance is approximately 500. Attach a Buffer if output.
GND
16
GND - D
--
0V
--
C-MOS GND. Locate the pattern as far as possible from the Bipolar - GND.
17
VDD
--
4.5V
--
C-MOS VDD. CMOS radiation can be greatly reduced by positioning a CR filter between this pin and Bipolar - Vcc.
4
Video ICs
Pin No. 18 Pin name VCC IN / OUT -- Voltage 5.0V Equivalent circuit --
VDD
BH7370FS
Function Power supply for the entire bipolar system.
1k
19
FS
--
--
19
1k
Output of the F-counter's CMOS charge pump.
GND VCC 300
20
PLL - FLT
--
3.0V
20 12.5k 300 GND VCC 200
Attached time constant of the PLL filter.
21
VIDEO - OUT
OUT
2.0V (SYNC)
21
100
2k
1p
Video output. Output via the sound trap, B / W noise inverter, and EQ amplifier.
GND VCC 200
22
EQ - FLT
--
2.0V (SYNC)
22
2k
1p
EQ filter (normally left open). For EQ characteristics, use an LCR series resonator to connect this pin to the ground.
GND VCC 400
23
AGC - FLT
--
23
4.0V
Attaching the filter time constant for the VIF and AGC.
GND
24
N.C.
--
--
--
Internally open.
5
Video ICs
BH7370FS
*Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 5V, P = 45.75MHz)
Parameter Supply current (Internal stabilization supply voltage) VIF Input sensitivity Max. allowable input level AGC range Quiescent video output voltage Video detection output level Synehronous signal tip voltage Symbol ICC (VREG) Min. -- -- Typ. 50 (2.6) Max. -- -- Unit mA V Conditions -- --
VVMin. VVMax. GR VP21 VVO VP21SY
-- 100 62 -- -- --
40 110 70 3.2 1.2 1.9 2 1 45 46 53 3.6 2.5 1.5 2.5 1.0 90 4.5 0.1
- 80 + 50
46 -- -- -- -- -- 5 5 -- -- -- -- -- -- -- -- -- -- 1.0 -- + 250 -- - 1.0 -- - 1.0 -- 39 -- -- -- 1.0 -- -- -- 0.3 50 100
dB dB dB V VP-P V % deg dB dB dB V V V V mA dB V V kHz kHz
VVO = - 3dB VVO = + 1dB VVO = 3dB range No signal, V23 = VCC P = 90dB, AM 87.5% MOD, 100% white video signal P = 90dB, AM 87.5% MOD, 3-step video signal 20LOG (VO4.5M / VO0.2M) P = 0, P / C = 4, P / S = 14dB P = 90dB, 100% white CW = 70dB Change in frequency and pin 23 voltage CW = 100dBAGCADJ = 20k AGCADJ = 20k CW = 45.25MHz CW = 46.25MHz -- --
Video output (DG) DG -- Video output (DP) DP -- Sound trap attenuation -- GVO4.5 920kHz beat level I920 -- Video output S / N 47 S / NV White noise threshold voltage -- VWTH White noise clamping voltage VWCL -- Black noise threshold voltage -- VBTH Black noise clamping voltage VBCL -- RF AGC Max. sink current IP3SI 0.4 RF AGC delay point -- VRFAGC AFT Maximum AFT voltage 4.0 VP10Max. Minimum AFT voltage -- VP10Min. AFT detection sensitivity -- S VCO free-running frequency - 250 FVCO PLL fCU + 1.0 PLL capture range 1 PLL capture range 2 -- fCL PLL lock range 1 fLU + 1.0 PLL lock range 2 -- fLL VCO control sensitivity -- SIF P = 45.75MHz / 90dB S = 41.25MHz / 70dB Input sensitivity -- VSMin. SIF Max. allowable input level 75 VSMax. FM detection output level VSO -- Audio output S / N -- SNAF Audio output distortion THD -- AMR AMR -- Muted video output voltage VVMUTE -- Muted audio output voltage -- VSMUTE MUTE start voltage -- V14MUTE VO4.5M output level 10 VVO4.5M 4MHz oscillator input VOSC 25
125 + 2.0 - 2.0 + 2.0 - 2.0 9.0 24 -- 500 55 0.2 53 2.5 2.2 -- 20 --
CW = 80dB MHz Frequency change MHz MHz MHz kHz / mV dB dB mVrms dB % dB V V V mVP-P mVP-P fm = 400Hz, f = 25kHz 5% distortion fm = 400Hz, f = 25kHz fm = 400Hz, f = 25kHz fm = 400Hz, f = 25kHz f = 12.5kHz, AM30% VP14 = GND VP14 = GND -- P = 90dB P / S = 20dB, when using FET probe --
6
Video ICs
BH7370FS
*Measurement circuit
PLL-FLT VIDEOOUT V23 VO-4.5M VCC 82p 27 4.7 100 0.01 0.01 GND-D US JPN 0.22 39k + 0.1 AGC-FLT 4.7 VCC
150
5.1k
+ 390
VDD
+ MUTE AFC 14 13
0.01 16 15
24 N.C.
23
22
21
20
FS 19
18
17
EQ
PLL DET
+ 45 SHIFT
- 45 SHIFT
F- COUNT
SIF TRAP SIF BPF
B/W INV VIDEO AMP
x
SOUND TRAP VIF AMP AGC VIF AMP
x
500k BPF LIM FM DEM AF AMP AFT - FB
12
VCO
x
REF FIL REF OSC
6 7 GND2 8
500
Digital AFT
100k
VDD
RF AGC
100k
N.C. 1 2 3 4 5 9 ECO 0.01 0.1 10 11
0.01
20k
GND1
0.01
22k AGC-ADJ VCC 1: 1 RF-AGC 0.01 4MHz IN AFTOUT
7.5k 0.01 DE.EM OUT
IFIN
Fig. 1
7
Video ICs
BH7370FS
*Application example
PLL-FLT VIDEOOUT VO-4.5M VCC 139p 4.7 15 100 0.01 GND-D US JPN 0.22 39k + 4.7 VCC
1000p
EQ
150
47
0.1 AGC-FLT
(180p) N.C. 24 23 22 21 5.1k 20 47
+ 5.1k 390 18
VDD
+ AFC 14
0.01 16 15
FS 19
17
13
EQ
PLL DET
+ 45 SHIFT - 45 SHIFT
F- COUNT
SIF TRAP SIF BPF
B/W INV VIDEO AMP
x
SOUND TRAP VIF AMP AGC VIF AMP
x
500k BPF LIM FM DEM AF AMP AFT - FB
12 AFT-FB 3.9k
VCO
x
REF FIL REF OSC
6 7 GND2 8
500
Digital AFT
100k
VDD
RF AGC
100k
1 N.C.
2
3
4
5
9 ECO 0.01 0.1
10
11
0.01
20k
GND1
0.01
22k AGC-ADJ VCC
7.5k SAW FILTER 0.01 intercarrier 4MHz IN IFIN AFTOUT DE.EM OUT
RF-AGC
Fig. 2
8
Video ICs
BH7370FS
*External dimensions (Units: mm)
10.0 0.2 24 7.8 0.3 5.4 0.2 13
1 1.8 0.1
12
0.11
0.8
0.36 0.1
0.3Min. 0.15
SSOP-A24
0.15 0.1
9

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