AN7345K | DigiCamel IC Datasheet

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AN7345K PANASONIC | Alldatasheet

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Dual Record/Playback Pre-Amplifier IC for Double Cassette ae Unit : mm @ Description The AN7345K is a monolithic integrated circuit designed 04 22 for double cassette, and built-in Dual-channel | E Record/Playback pre-amplifier including ALC function in p' = =e the shrunk 24-DIL Pin Package. g e a q E £ a ES 5 J is a FS { @ Features vat_|_ Bo @ Built-in equalizer SW circuit for Playback Amplifier or 4 Las. @ Built-in Playback Amplifier input switching circuit " for Double Cassette a a7 @ Wide operating supply voltage range : Vec(opr) = 4V ~ 12V entre sat on 24-Lead Shrunk DIL Plastic Package (24-SDIP) @ Block Diagram Vec as me ee | | } => ee Source Amp, i EQ CTL PB | = o) ° GND ee SSSeSSSeSSSeSSeeSeeeSeeeeeeseeseeSeesesesesesesesese Mm 6932852 0033990 346 a Panasonic 371

@ Absolute Maximum Ratings (Ta=25°C) Tea Ua Supply Vase a Sippy Coen mA Operating Ambient Temperature °c Storage Temperature *c Operating Supply Voltage Range: Vcc = 4.0V ~ 12.0V @ Electrical Characteristics (VcCc=5V, Ta=25°C) tem [ symbor] Condon | min. Typ. | mas. [uni NoSignal Supply Curent [| te [ Varov | | ot | 7s ma Playback Amp. Input Noise Voltage [ Yan | Re=22epwavdio TT | 2 | wv Open-Loop Gain | Gvom | f=tkHe,Vo=oupv [as | ae | |e Closed Laop Guin | Grom | T=IkHe,Vo=mpv SYS | a Max. Ouputoiwge | Vom | f=IkH,THD=28 +t oa | ta [|v Chane! Baas [cae | feliz Vomousv i as | 0 fas] a Chanel Grssatk | Tew) | f= ite, Vo=oupviR=aaKa | ss | os | | Source Crosstalk [ tse | f= thie, Vo=OBVR,= 220 [ss [6s | [ae REC. Amp. Opes. Cain [ Grom | f= tili,vo-oBy io | || Mas. Opa Vlage [Vom | faint, THD=38 aa fue || Chanel Crssalk | CTay | f= iki, Vo=Oipv.j=00 | so | «3 | | ws ALC ALCSRVohage [Vaz | (=i, Vasa [ore [vos pa |v ALE Range“ [wae | fete, VomoapvRe=saa [as || | a ALC Chamel Baines [CB | f= Iie Vo=4OBVR, =a | 2 | 0 | | a Note : (#1) ALC Range is the input range from Vin = -40dB until the output THD becomes 3% ——— Panasonic MH 6932852 001399) 482 Mm 372

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ee ———— @ Pin Descriptions Channel 1 Playback 1 | Amp. Input (1) Channel 2 Playback 24 | Amp. Input (1) (\\, 8 Playback amp. input. Channel 1 Playback @ (oor ” pnp 2_| Amp. Input (2) AC3.7mV @ Channel 2 Playback 23 | Amp. Input (2) Channel 1 Playback 3 | Amp, Negative Feedback DC=0.7V Playback amp. feedback. Channel 2 Playback 22 | Amp. Negative Feedback 112k 4. | Channel 1 Playback Amp. Output ® @ Playback amp. output. 31 __ | Channel 2 Playback Amp. Output AC IV S| Channel Equalizer | Playback amp. 20 | Channel 2 Equalizer @ Equalizer switching. Ik Voc DC=14V a) . Pre-amp. Input (Pin 19 High) S) Connet capacitor which

6 Switching Time determines PB input

Constant DC=0.2V © Sheet, switching time constant. (Pin 19 open) +H 8 8 Channel 1 Rec. 7 | Amp. Input @ Rec. amp. input. 1g | Channel 2 Ree 40K ‘Amp. Input AC19mV ev g | Channel 1 Rec. Amp. a Negative Feedback 8 DC=07V Rec. amp. feedback. Channel 2 Rec. Amp. 17 | Negative Feedback vec ® 6) | Channel 1 Rec. Amp. Output (}s00 Rec. amp. output. 16 Channel 2 Rec. Amp. Output ACO5S mV — OOOO @™ 6932852 0013994 59] a Panasonic 375

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@ Application Notes (1) ALC Detector The detector is built-in. ALC is cut-off during play-back by shorting Pin 11 to Ground. Pin 11 is connected with a condenser 33yF and a resistor 2.2MQ when this condenser charges up to about 1.4V during ALC operation, the output AC Voltage of the recording amps are maintained at 1V. (Frequency = 1kHz, Voc = 5.0V, extemal resistor at Rec-amp. inputs = 5.6kQ). The ALC attack time is about 40ms, while the ALC recovery time is about 8s. These were found experimentally using the above conditions. (2) Tape-Type Equalisation Control When voltage at Pin 15 is ‘High’, tape playback response is for metal (701s). When voltage at Pin 15 is ‘Low’, tape playback response is for normal tape (120s). When voltage at Pin 15 is ‘High’, the internal switches at Pin 5 and 20 are shorted to Gound. Otherwise when Pin 15 is ‘Low’, these switches are opened. Range of safe operating ‘High’ voltage for Pin 15: 1.0V < limits < 12.0V ‘There are 1kQ resistors internal at Pin 15 to limit the current. However, it is advisable to put an external resistor of 10kQ to reduce any switching noise. i 15k u Vv. i aS = He vi i ar, ui th (ak Ls Loe eG) =~) TT ik []100K £ (3) Pre-Source Control When the voltage at Pin 19 is ‘High’, input signals at Pin 1 and 24 are selected for the pre-amps. When the voltage at Pin 19 is 'Low’, input signals at Pin 2 and 23 are selected. Similarly for safe operation ‘High’ voltage at Pin 19: 1.0VS limits < 12V Also, if possible, use an external 22kQ resistor at Pin 19 to reduce any switching noise. a Panasonic mm 6932852 0013997 2T0 ml 378

Product Information

AN7345K specifications and overview.

Summary

Dual Record/Playback Pre-Amplifier IC for Double Cassette

Description

Dual Record/Playback Pre-Amplifier IC for Double Cassette

Source title AN7345K Datasheet(PDF) - Panasonic Semiconductor

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