MB4507A | DigiCamel IC Datasheet

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MB4507A FUJITSU | Alldatasheet

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Edtion 2.0 DUAL TONE MULTI-FREQUENCY OSCILLATOR ‘The Fujteu MB4SO7A is a Dual Tone Muiti-Frequency (TMF) oscillator designed for use with pushbutton telephones. Depending on which pushbuttons are L pressed, the MB4507A dlvides the output of an external crystal osolator to Sh Generate a precise series of synthesized sine waves from an on-chip ROM and ME -O>, digital-to-analog converter. A 3-pole fitter with external capacitors is used to Ce provide output sine waves that are nearly dstortion-free. By using an external Le crystal oscilator, the MB4S07A can generate very stable frequencies even with So oh . ‘an unregulated supply voltage. An inexpensive TV-color crystal (3.58 MHz) can Ne <a AN be used for the external oscilator. ‘The MB4507A DTMF oscllator fs housed In a 22-pin plastic OIP. © On-chip frequency synthesizer with extremely stable output ‘© Sine wave outputs that are nearly distortion-free # Inexpensive color-TV erystal (3.579545 MHz) can be used for external PLASTIC PACKAGE oscliator DIP-22P-M03 © On-chip automatic pad oircut uses tine-current detection with external resistor @ On-chip switch debounce circutts © Precision tracking of key Inputs permits wide tuning range of Input codes PIN ASSIGNMENT © Logic circuits decode simultaneous input of two keys: — Only tower group oscilates when laterally adjacent buttons are pushed simultaneously — Only higher group oscillates when vertically adjacent buttons oda 22D sub are pushed simultaneously ude 210 a — No oscillation when diagonally adjacent buttons are pushed weds yep ape ‘simultaneously: us yoP) He ads eB a ABSOLUTE MAXIMUM RATINGS (Ta= 25°C, see NOTE) x2To vp or sw 7 ss) ce [_—rarameter__—svmbor | vatwe [unt | ves spo 7 veo Go uP ne ‘Supply Voltage vu v mute G10 13) Pad fst ciren [ww wie | 08] wa | « [Operating Ambient Temperature -25 to +65 Storage Temperature “85 to +128 iis ance SEE SRY 1 SR Ita aoa corapew ts Sah stats NOTE: Permanent device damage may occur if the above Absolute yGlinges or eiectrc Heide: However i is Maximum Ratings are exceeded. Functional operation should be sevieeg tat normal precautions be {sien to restricted to the conditions as detailed in the operational sections of Tamar fated wStapes tots igh pes. this data sheet, Exposure to abeolite maximunt rating conditions for ay extended periods may affect device relabilty ‘Copyright © 1988 by FUJITSU LIMITED and Fujitsu Microsiectronics, Inc, 6-3

Fig. 1 — MB4507A BLOCK DIAGRAM. fen) (a he Basel Uy ‘Lees Saitanenes ete Lew |} Lee | (at RL ee | x] x xe 6-4

OHA ; FUJITSU MB4507A HINA RECOMMENDED OPERATING CONDITIONS (Referenced to GND) a a [ sre cure | Latte ntwe | a ee ee

ELECTRICAL CHARACTERISTICS

(IL=20 to 70mA, Ta = 25°C#2°C) ee ee eed Smet [vn [ave [ax | [a [[= fe] >| Ja [te [10 [voce [oo | x | [ta [oo [roo [oe | x | a [ee [an [oe | | [tm [ -o9 [om | oe | x | | te [oe [ox | os | x | | to | oo [woe | os | x | . [ors | fie | | ee ee ee Jw | fe | | corp Freeney [ow | [wo [|e | [ow [Pee [|e | [one [foe [|e | [tw [Pee [OTe 6-5

AAS, : FUJITSU aii MB4507A, DTMF OPERATION “ ‘© Subscriber's line isolated from the control system. Fig. 3 — UTILIZING PHOTOISOLATION TECHNIQUES Soneetey power 74+ ‘Subscriber line side <TR> 1 u . eD @) eD | | “D @I | _6 | m «D1, 10% 2 « DR a »D «|| , te “D Ge | ws w« +) 3 Qs lg 150 mA Max. 6-8

Fig. 4 — DTMF POWERED FROM CONTROL SYSTEM POWER SUPPLY Vee (+5V) 0, = | } Output on Ht y ‘Signal 4 48,19,20,21] 1 « to ' . u -—- 150 2 Po. io Digital Control Block oTMF 519.0 Deas PAD Vect

5 Veer | 6 |

. wf D -Reset ot fo ce ar ‘sub GND C3 D “° ae | . Qy must be able to sink le 150 mA Min. 6-9

‘TUG, FUJITSU INGER 4507 EXAMPLE USING EXTERNAL CLOCK SIGNAL ‘An external 3.58 MHz clock signal may be applied to input X1. clock to prevent coupling to the on-chip blas levels of the OTMF However, care must be taken to properly Isolate the external IC. Three methads are shown below to accomplish this. Fig. 5 — CAPACITOR COUPLING MB4S07A osc 6 Sh x1 1000pF sub GND 7 | 22 Fig. 6 — PHOTOISOLATOR COUPLING MB4S07A osc é Sy it sub GND 22 . Photocoupier 6-10

geil . FUJITSU MB4507A NARA Fig. 7 — TRANSFORMER COUPLING MB 4S07A SY xt sub ann 7 {22 . Fig. 8 — TIMING DIAGRAM Vune FA : | 6 | nav Veo Va Key M ty (SINK) 4.6 ms. fe fe 4.6 ms 4 4 Notes: Ah My eee : Mot Calling starte after 4.6mS. During this 4.6mS oe interval, the previous conditions must be maintained. (Voees1.1V) “2. The DTMF can be reset by externally shorting Voca to GND. 6-11

HIE. MIB4SO7A Fig. 9 — MB 4507A DTMF EQUIVALENT CIRCUIT INPUT-OUTPUT BLOCKS 3.0V (La) Output, Filter Block } 12 DAC ae te ace Xu mm a) a Internal $44 Logic vot 1 Lj “e ror ft | sora Max 20k Loge J 8 HO . =| 6 | Key Interface Block O a C)Q ,“ cho hole O) © O° x2 bal ° Pad | & ia O. hS—~ internal Xtal Logic oan [ete [sl A a ) 10 (s) sub Xtal OSC Block Pad 6-12

EAU . FUJITSU MB4507A MIN 22-LEAD PLASTIC DUAL-IN-LINE PACKAGE (CASE No.: DIP-22P-M03) L 18° MAX poof oeoooos Oex- 1 >) O 358.2 008 (400+ 01 noex-2 I to's 820) (ioe 8) (EJECTOR MARK) . Coro oer oro er +908 [egg oe oro’ (27.557 9.50) oath 650 1.201 MAK ay #012 got 9.905 74. | 27.00 max 6 | ik 118 (2.00) Mn 100 2sarv leaf walle 28828, c0010.51 Olmensioe in ches (eaters) oaaotes-2e 6-13

Product Information

MB4507A specifications and overview.

Summary

DUAL TONE MULTI-FREQUENCY OSCILLATOR

Description

DUAL TONE MULTI-FREQUENCY OSCILLATOR

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