THIS DOCUMENT IS FOR MAINTENANCE PURPOSES ONLY AND IS NOT RECOMMENDED FOR NEW DESIGNS MV5089 DS3126-2.0 June 1993 MV5089 DTMF GENERATOR The MV5089 is fabricated using ISO-CMOS high density technology and offers low power and wide voltage operation. An inexpensive 3.58MHz TV crystal completes the reference oscillator. From this frequency are derived 8 different sinusoidal frequencies which, when appropriately mixed, provide Dual-Tone Multi-Frequency (DTMF) tones. Inputs are compatible with a standard 2-of-8 active-low keyboard and the keyboard entries determine the correct division of the reference frequency by the row and column counters. D-to-A conversion, using R-2R ladder networks, results in a staircase approximation of a sinewave with low total distortion. Frequency and amplitude stability over operating voltage and temperature range are maintained within industry specifications. VDD 1 16 TONE OUT TONE DISABLE 2 15 SINGLE TONE INHIBIT COLUMN 1 3 14 ROW 1 COLUMN 2 4 13 ROW 2 COLUMN 3 5 12 ROW 3 VSS 6 11 ROW 4 OSC IN 7 10 ANY KEY DOWN OSC OUT 8 9 COLUMN 4 DP16 MP16 Figure 1: Pin connections - top view FEATURES ■ ■ ■ ■ ■ ■ Pin-for-Pin Replacement for MK5089 Low Standby Power Minimum External Parts Count 2.75V to 10V Operatlon 2-of-8 Keyboard Input High Accuracy Tones Provided by 3.58MHz Crystal Oscillator ■ Pin-Selectable Inhibit of Single Tone Generation APPLICATIONS DTMF Signalling for ■ Telephone Sets ■ Mobile Radio ■ Remote Control ■ Point-of-Sale and Banking Terminals ■ Process Control ROW INPUTS { 1 2 3 SINGLE TONE INHIBIT 4 RR RR VDD VSS RR RR VDD KEYBOARD LOGIC ROW COUNTER ÷4 OSC OUT SINE WAVE COUNTER D/A CONVERTER VDD 1/ V 2 DD OSC IN COLUMN COUNTER SINE WAVE COUNTER + - TONE OUT VDD D/A CONVERTER KEYBOARD LOGIC TONE DISABLE VDD RC RC VSS RC KEYBOARD LOGIC VSS ANY KEY DOWN RC 2 3 4 { 1 COLUMN INPUTS Figure 2: Functional block diagram 1 MV5089 OUTPUT FREQUENCY Standard DTMF (Hz) Table 1 shows the output frequency deviation from the standard DTMF frequencies when a 3.58MHz crystal is used as the reference. The row and column output waveforms are digitally synthesised using R-2R D-to-A converters (see Fig.3), resulting in staircase approximations to a sinewave. An opamp mixes these tones to produce a dual-tone waveform. Single tone distortion is typically better than 7% and all distortion components of the mixed dual-tone should be 30dB relative to the strongest fundamental (column tone). 697 770 852 941 1209 1336 1477 1633 f1 f2 f3 f4 f5 f6 f7 f8 Row Column Tone Output Frequency Using 3.5795545 MHz Crystal 701.3 771.4 857.2 935.1 1215.9 1331.7 1471.9 1645.0 % Deviation from Standard +0.62 +0.19 +0.61 -0.63 +0.57 -0.32 -0.35 +0.73 Table 1: Output frequency deviation VOUT a) t VOUT b) t Figure 3: Typical sinewave output (a) Row tones (b) Column tones DISTORTION MEASUREMENTS THD for the single tone is defined by: 100 ( 2 + V2 + ---- V2 ) % V22f + V3f nf 4f V fundamental Where V2f --- Vnf are the Fourier components of the waveform. THD for the dual tone is defined by: 100 ( 2 + V2 + V2 + V2 --- V2 + V2 ) V22R+ V3R nR V2 2C ROW where 2 3C nc IMD + V2 COL VROW is the row fundamental amplitude VCOL is the column fundamental amplitude V2R—VnR are the Fourier component amplitudes of the row frequencies V2C—VnC are the Fourier component amplitudes of the column frequencies VIMD is the sum of all intermodulation components. Low Group High Group MV5089 PIN FUNCTIONS PIN NAME DESCRIPTION 1 VDD Positive Power Supply 2 TONE DISABLE This input has an internal pull-up resistor to VDD. When connected to VSS no tones are generated by ant key depression allowing the keyboard to be used for purposes other than DTMF signalling. 3,4,5,9 Column 1-4 These CMOS inputs are held at VSS by an internal pull-up resistor and are activated by the application of VSS. 6 VSS Negative Power Supply (OV) 7,8 OSC In, OSC Out On-chip inverter completes the oscillator when a 3,579545 MHz crystal is connected to these pins. OSC In is the inverter input and OSC Out is the output. 10 Any Key Down This is an NMOS transistor output which switches to VSS while any key is depressed. Otherwise this output is high impedance. Switching is independent of Tone Disable and Single Tone Inhibit. 11,12,13,14 Row 1-4 As Column 1-4 inputs. 15 Single Tone Inhibit This input has a pull-up resistor to VSS. When left unconnected or tied to VSS, dual tones may be generated, but keyboard input combinations resulting in single tone generation are inhibited. When VDD is applied single or dual tones may be generated. 16 Tone Out Emitter output of a bipolar NPN transistor whose collector is tied to VDD. Input to this transistor is from an op-amp which mixes the row and column tones. ROW AND COLUMN INPUTS These inputs are compatible with the standard 2-of-8 keyboard or with an electronic input. Figures 4 and 5 show these input configurations and Fig.6 shows the internal chip structure of these inputs. When operating with a keyboard, dual tones are generated when any single button is pushed. With Single Tone Inhibit at VDD, connection of VSS to a single column causes the generation of that Column tone. Connection of VSS to more than one Column will result in no Column tones being generated. Connection of VSS to Rows only generates no tone - a Column must be connected to VSS. A single Row tone only may be generated by connecting 2 columns, and the desired row, to VSS. COLUMN VDD VSS VDD ROW VSS Figure 5: Electronic input VDD OUTPUT TONE LEVEL RR The output tone level of the MV5089 is proportional to the applied DC supply voltage. A regulated supply will normally be used which may be designed to provide stability over the temperature range. ROW INPUT STATIC PROTECTION COLUMN INPUT STATIC PROTECTION Row input sensing circuit Column input sensing circuit RC COL VDD VSS ROW Figure 4: 2 of 8 DTMF keyboard Figure 6: Row and Column inputs 3 MV5089 ABSOLUTE MAXIMUM RATINGS VDD - VSS Voltage on any pin Current on any pin Operating temperature Storage temperature Min. Max. -0.3V VSS - 0.3V 10.5V VDD + 0 3V 10 mA +85°C +150°C -40°C -65°C Min. Power dissipation Derate 16 mW/°C above 75°C (All leads soldered to PCB) Max. 850 mW DC ELECTRICAL CHARACTERISTICS Test conditions (unless othenwise stated): Tamb = +25°C, VDD = 3V to 10V OUTPUTS INPUTS SUPPLY Characteristics Operating Supply Voltage Symbol Min. VDD 2.75 Standby Supply Current IDDS Operating Supply Current SINGLE TONE Input High Voltage INHIBIT Input Low Voltage TONE DISABLE Input Resistance ROW 1-4 Input High Voltage COLUMN 1-4 Input Low Voltage IDD VIH VIL RIN VIH VIL ANY KEY DOWN IOL IOZ Sink Current Leakage Current Typ. 0.2 0.5 1.0 5.0 0.7VDD 0 Max. Units 10 100 200 2.0 10.0 VDD 0.3VDD V uA uA mA mA V V KΩ V V mA mA uA 60 0.7VDD 0 0.5 1.0 VDD 0.3VDD 1 Ref. to VSS VDD = 3V VDD = 10V VDD = 3V VDD = 10V No Key Depressed All outputs Unloaded One Key Depressed All outputs Unloaded VDD = 3V, VOL = 0.5V VDD = 10V, VOL = 0.5V VDD = 3V, AC ELECTRICAL CHARACTERISTICS Test conditions (unless othenwise stated): Tamb = +25°C, VDD = 3V to 10V Characteristics TONE OUT OUTPUT LEVEL, ROW PRE EMPHASIS, High Band OUTPUT DISTORTION (Dual Tone) Tone Output Rise Time 4 Symbol Min. Typ. Max. Units VOUT -10 -8 -7 dBm 2.4 2.7 3.0 -20 dB dB 5 ms tr 3 VDD = 3V. Single Tone. RL = 100kΩ Total out-of-band power relative to sum of row and column fundamental power Time for waveform to reach 90% of magnitude of either frequency from initial key stroke MV5089 VDD COL 1 3 1 SINGLE TONE INHIBIT 15 7 COL 2 4 COL 3 5 COL 4 9 1 2 3 A 4 5 6 B 7 8 9 C * 0 # D VSS ROW 1 ROW 2 3.58 MHz XTAL 8 TONE DISABLE MV5089 2 16 14 TONE OUTPUT RL 13 ROW 3 12 ROW 4 VSS 11 6 10 VSS ANY KEY DOWN Figure 7: Connection diagram 5 For more information about all Zarlink products visit our Web Site at www.zarlink.com Information relating to products and services furnished herein by Zarlink Semiconductor Inc. trading as Zarlink Semiconductor or its subsidiaries (collectively “Zarlink”) is believed to be reliable. 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