bh7802k ROHM Co. Ltd., bh7802k Datasheet
bh7802k
Related parts for bh7802k
bh7802k Summary of contents
Page 1
... Single chip Hi-Fi audio signal processor BH7802K The BH7802K incorporates the functions for a VHS audio signal processing system on a single chip. The circuits on the chip are a peak-noise reduction processor (PNR modulator / demodulator circuit switcher, an automatic FM detector circuit bandpass filter, and a regulator circuit. ...
Page 2
... MODEM D.O. COM. LINE2L VCO BPF LINE2R AUTO OUTPUT BSL ADJUST SWITCH BSR ALC MODEM DATA PNR DECODER BH7802K REC OUT FM AUDIO HEAD SW OUT 20 PULSE ALC 19 18 VCCM VCO FO ADJ 17 BPF ADJ 16 FMBPF GNDM 15 ...
Page 3
... Typ. P-P 0. EE: 0.8V PB: 1.0V 0.0V 1.9V 2.5V 5.0V 0.0V — EE: 3.3V 0.0V – 5.0V 0.0V 0.0V 0.0V — 0.0V 2.5V 5.0V 5.0V 0.0V – 5.0V 0.0V – 5.0V 0.0V BH7802K circuit 150k EF (NPN) ~ 200 B (PNP) B (PNP) — 200k — — — 11.5k 100k EE: 50k PB, ADJ: EF (NPN) — EF (NPN) ~ 200 EF (NPN) — EF (NPN) ~ 2.5k B (PNP) EF (NPN) ~ 200 100k EF (NPN) ~ 500 EF (NPN) 330 EF (P-P) 3k > 2.5V) 88k 10k — ...
Page 4
... LINE1, LINE2 (34, 33, 41, 40, 44, 43pin 58k 33 (34, 40, 41, 43, 44pin) 30k V EE GND MIX OUT (28pin 200 V EE GND (13pin 3.5V 50k 21 12. GND BH7802K V CC – 2.0V 2. GND 200 5k 47k V EE GND V CC 20p 100k V EE GND ...
Page 5
... ENVE OUT / ADJ FLAG / Hi-Fi DET (14pin 30k V EE GND SDA (6pin FSC IN (8pin 2.5V 8 10k V EE GND BH7802K V CC 200 14 50k V EE GND V CC 30k GND 100k 50k 100k V EE GND 5 ...
Page 6
... Recording MUTE : OFF : Hi-Fi MIX : OFF : Typ. : Typ. : FNORM detect, no ENVE output : OFF : ALC (MUTE) LINE1 / LINE2 / – 10.2dBV IN LINE1 / LINE2 / 0.0dBV IN LINE1 / LINE2 / 8.0dBV IN Lch 1.30MHz Rch 1.70MHz Lch 1.40MHz Rch 1.80MHz 3.579545MHz 4.433619MHz BH7802K = – 10V) EE ...
Page 7
... MIX – 4.2 – 2.2 – 0.2 dBV BH7802K Conditions EE MODE, after carrier frequency adjustment with no input PB MODE, carrier frequency adjustment FNORM, after BPF adjustment EE MODE, after carrier frequency adjustment with no input PB MODE, carrier frequency adjustment FNORM, after BPF adjustment V — ...
Page 8
... FM PB IN, OUTPUT: LINE OUT – 1.2 0.0 + 1.2 dB – 1.2 0.0 + 1.2 dB BH7802K Conditions INPUT condition 1 NORMAL IN: – 20dBV No input, after automatic adjustment No input, after automatic adjustment INPUT condition 1 INPUT condition 10kHz) FM OUT SW mode P-P FM OUT SW mode P-P Spectrum ratio of 2nd harmonic with respect to ...
Page 9
... V 3.70 3.95 4.20 V 1.96 2.46 2.96 V BH7802K Conditions After automatic adjustment, NTSC f = 1.505MHz 200mV IN P-P After automatic adjustment, PAL f = 1.605MHz 200mV IN P-P 1.30MHz + 1.70MHz FM ALC ON 1.15MHz + 1.70MHz 1.45MHz + 1.70MHz 1.30MHz + 1.70MHz 1.30MHz + 1.70MHz FM ALC ON 1.55MHz + 1.30MHz 1.85MHz + 1.30MHz 1.30MHz + 1.70MHz 1.40MHz + 1.80MHz 1 ...
Page 10
... DATA IN L mode holding voltage V H6L H mode holding voltage V H6H MUTE CTRL MUTE holding voltage V H32L DC MUTE holding voltage V H32H 10 Min. Typ. Max. Unit 0.0 — 0.5 V 2.5 — 0.0 — 0.5 V 2.5 — 0.0 — 1.0 V 3.9 — BH7802K Conditions — — — — — — ...
Page 11
... D.O. COM. REG LINE2L VCO BPF LINE2R AUTO OUTPUT BSL ADJUST SWITCH BSR ALC MODEM INPUT SWITCH DATA DECODER Fig.1 BH7802K 100 22 PNR 0. REC OUT 10k FM OUT 20 AHSWP IN SW 0.022 27k 17 27k FMBPF 16 15 ...
Page 12
... Video ICs • Circuit operation Function table The BH7802K includes the following functions on one chip. No. Block name · 5V regulator (V 1 Regulator · Anti-pop circuit (ANTI-POP) · BUS control I C BUS data decoder · 3 Input switcher TUNER ( LINE 1, 2 (L, (L, R) switch · ...
Page 13
... COM. LINE2L VCO BPF LINE2R AUTO OUTPUT BSL ADJUST SWITCH BSR ALC MODEM INPUT SWITCH DATA DECODER Fig.2 BH7802K 24 23 100 22 PNR 21 FM REC OUT FM OUT 20 AUDIO HEAD SWITCH SW 0.022 PULSE 27k 17 27k FMBPF 16 15 ...
Page 14
... FREQUENCY: f (MHz) Fig BPF frequency characteristics (NTSC) • External dimensions (Units: mm) 14.0 0.3 10.0 0 0.15 0.8 0.35 0.1 0.15 QFP44 14 Lch Rch – 10 1.4MHz 1.8MHz – 20 – 30 – 40 – 50 0.85 1.60 (MHz) FREQUENCY: f Fig BPF frequency characteristics (PAL) 0.1 BH7802K 2.35 ...