TP53130

TP53130 NSC | Alldatasheet

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• a ZA National g TP53130 DTMF (TOUCH TONE®) Generator with Binary Data and Keypad Interface General Description Features ‘The TP53130 is a low threshold voitage, ion-implanted, ™ 3V-15V operating voltage metal-gate CMOS integrated circuit that generates all ™ On-chip 3.579545 MHz crystal-controlled oscillator dual tone iulti-requency (OTMF) pairs required in tone Tone accuracy better than + 1% without tuning dialing systems. The 8 audio output frequencies are gi torace with standard 2.018 teleshone keypad generated from an on-chip 3.579545 MHz master oscil- rerface with standard 2-0f-8 telephone keypa lator. No external components other than the crystal are ™ Interface with single-contact low cost keypad required for the oscillator. The TP53130 can be powered ™ Input signals can be in binary code directly from telephone lines over wide range loop condi- ™@ Multi-key lockout with/without single tone capability tions. The device can interface directly to an inexpensive On.chip high band and low band tone generators and single-contact calculator type keyboard or a standard mixer telephone 2-0f-8 keypad (Figure 4). The TP53130 is also . capable of accepting binary code inputs for micro. ™ High band pre-emphasis processor-controlled systems applications. & Low harmonic distortion © Open emitter-follower low impedance output Separate receiver mute and transmitter mute switch outputs ® Powered directly from the telephone line Block Diagram OSC IN Osc OUT ¢—| Yoo KEY/BINARY SELECT PROGRAMMABLE TONE DISABLE ee Cp 27 fe) c WAVEFORM ‘TONE

3 GENERATOR ouT

R2. GENERATOR Ra. PROGRAMMABLE VOLTAGE DIVIDER REFERENCE Ra +80 +66 MODE SELECT “ | ozs | Vss—> XMT SW XMT SW MUTE CONTROL MUTE FIGURE 1 5-109

8 Absolute Maximum Ratings

8 Voltage at Any Pin Except XMT SW and MUTE Vgg - 0.3V to Vop + 0.3 . QL | Voltage at XMTSWand MUTE Pins Veg ~ 0.3V to 15V f= | operating Temperature Range -40°C to +70°C : Storage Temperature Range 65°C to + 150°C . Voo-Vss 15V Lead Temperature (Soldering, 10 seconds) 300°C Electrical Characteristics 1, within operating temperature range, 3V< Vp <8V, unless otherwise specified. input Pull-Up Resistor Column and Row Inputs 25 50 90 ks Key/Binary Select 200 650 1000 kg Mode Select 200 650 1000 ks Tone Disable 200 650 1000 kg Input Pull-Down Resistor Column and Row Inputs Vpo=3V 650 a Voo = 8V 200 . 2 Input Voltage Levels Logical "1" 80% of Voo Voo v Logical “0” Vss 20% of Voo v Operating Frequency 3.579545 MH Output Voltage Swing at Tone Output Low Band Alone Ry> 1500 820 mvp High Band Alone Ay> 1509 +000 mvp Harmonic Distortion R.> 1509 -20 ae Tone Frequency Deviation 10 % Typical Application Output 20<1,< 100 mA Level V; (See Figure 5) Low Band Tone R.= 1509 -6 0B High Band Tone R,= 1500 -4 aB THD 1520 kHz 4 % Output Currents Vpo=3¥ XMT SW/MUTE Vour=2V 3 mé Idle Current RL = ©, Vpp=8.0V 1 mA {No Key Depressed) Operating Current RL = &, Vpp =3.5V 2 mA Key Down to Tone Outputting 3 4 ms Time (Debounce) DC Output Tone Disable = 0 TRISTATE” 5-110

J Connection Diagram a Dual-In-Line Package g LIn-Line Pai o o " So Voo: one ourur Tone omer 3 "wove seusct ad ey A % a 2 s| “ Order Number TP53130N bad ” ‘See NS Package NI8A ve! any A 2 osc our: AMT 9 asc Myure | 1” nee to ror view FIGURE2 Functional Description A functional block diagram of the TP53130 is shown in umn. During multiple key operation, the XMT SW and Figure 1, and connection diagram is shown in Figure 2. MUTE outputs will not change state more than once. With The TPS3130 can be operated in the Keyboard Interface the device operating in the Binary Interface Mode, a Mode and can also be operated in the Binary Interface logical low at the column 1 input will inhibit the high band Mode depending on the logic level at the Key/Binary Select tone output while a logical low at the celumn 2 input will input. In either mode, the device will digitally synthesize inhibit the low band tone output. (See Table |.) Logical low the high and low band sine waves of DTMF signaling, inputs on both column inputs 1 and 2 will disable the when valid signals are applied to row andior column in- device the same way as the Tone Disable input will when puts. The sum of the two sine waves is then providedat the set to logical low. Tone output. Mode Select: This input has an internal pull-up resistor. When tine et open orat fooleat Noh eae Heid ‘When open or at logical high, single tone outputs are or ate . allowed. When this input is at logical low, single tone out- SW and MUTE outputs will deliver valid output signals in putt ave prohibited. XMT SW arel MUTE outputs will stay response to the proper input signals. When Tone Disable Pigh during o multiple key deoreseron inet is at logical low (Veg), the device will be in the inactive mode. ig 9 iple key depression input. Tone output will go to an open circuit state, XMT SW and Tone Output: Dual-tone out ‘ x ; put frequencies are generated MUTE outputs wll sink curent through on-chipN-channel in response to valid input signals to the device. (See Gevices and the crystal oscillator will be disabled. Table ill.) Each frequency is synthesized with 32 steps of Key/Binary Select: When this input is open or at logical approximation for low harmonic distortion. The ampli- high (Vop), the device will interface akeyboard.(See Table|,) tudes of the low and high frequency tones are constant ‘When Key/Binary Select is low (Vga), the device will accept and independent of operating voltages. When tone out- binary inputs on the row signal input lines. (See Table II) puts are present, the Tone output will be the composite of . the AC signal superimposed on a DC offset. The DC offset Oscillator: Tone generation and internal timing are de- is approximately 1/2 Vop. When no tones are present at the pendent on the accurate operation of the crystal oscil- Tone output pir. the gan will be open circu. lator. The oscillator inverter/amplifier and all necessary 7 Per : bias networks are included on-chip. The only external . component is a 3.579545 MHz crystal. It should be con- XMT SW (Transmitter Switch) and MUTE Outputs: In the sorted to the device a chown inthe typical application idle state (no key depressed, no signal interface inputs re n owen in the typioe! ae and Tone Disable at a logical low) both the XMT SW and diagram (Figure 5). The oscillator is not running unless a MOTE a gure 5) ; outputs will sink current to Veg through on-chip valid input signal is applied to the device. The oscillator is. sanwistone te the active atate thee Sua also disabled when Tone Disable is tied to logic low (Vsg). current from Veg, whenever valid Sutput vones ave . ‘ oD Ths featore wil prevent RF modulation on the telephone Generated. The MUTE cutput ectivates before tho MT SW J output as shown in Figure 3. Single Tone Capability: This is a desirable feature for initial testing. With the device operating in the Keypad Signal inputs (Row and Column Inputs}: An input scan Interface Mode, operation of multiple keys in different technique is used so that the device can directly interface rows and columns will not generate output tones. either 2-of-8 keypads with common switch arrangements However, operation of two or more keys in the same row or or the single contact X-Y keypads when Key/Binary Select column will generate the proper tone for that row or col- is open circuit. (See Figure 4.) att

8 Functional Description (continues)

FIGURE 3. Timing Diagram of MUTE and XMT SW in Relation to Key Input and Tone Output.

1 One One ft fa 1 1

1 One Two or More fy 0 1 1

1 Two or More One 0 fu 1 1

0 Binary Open fe fy 1 1

1 Open |Open| 0 0 oO 1 697 1209

2 Open |Open| 0 ) 1 oO 697 1336

3 Open |Open| 0 0 1 1 697 1477

6 Open |Open| 0 1 1 oO 770 1477

7 Open | Open; 0 1 1 1 852 1209

8 Open} Open} 1 oO oO ° 852 1336

9 Open |Open| 1 oO 0 1 852 1477

0 Open|Open| 1 oO 1 0 941 1336

Functional Description (continued) a : o ’ ~~ TABLE Ill, OUTPUT FREQUENCIES T Desired Freq. (H2)| Actual | po cont nom Frequency | ovation INTERNAL CIRCUTTRY po To | we vs H RI 697 699.1 0.306 H R2 770 766.2 | -0.497 RS 852 847.4 — 0.536 FIGURE 4a. Standard Dual Contact Telephone Key Ra 981 948.0 oat cl 1209 1215.9 0.569 ' c2 1336 1331.7 | -0.324 i c3 1477 1471.9 = 0.35 <okway WTERNAL CIRCUITRY 4 1 1645.0 0.736 c. 1633 64! T I INTERNAL CIRCUITRY i FIGURE 4b. Single Contact Key Typical Application ee 5 ! ae FY wooowren i wf CL ' it 1 i| 1 | im ble INGER tnctes yf x i ee Dak H Note t: All resistances are in ohms, | wee H ‘ Note 2: Test crout used to meoaure signa Ievele and eietortion. i | ! { wm || i Fa B \\, ° Lt “ustoncut J WoOKSMiTCH A RR war 2 OTT Gonesecmeurey | _ \\ AY " fhm NN 1 pert ware { eae ! foscour ™ r-t---- f-----4

1 On 910

vane [br H 7 ose te 1 Oar ‘ : iJ, pi ee | end we wer. a a) O00 my > Tea NA ADJUST FOR LEVEL FIGURE 5 5413