MC34115P Motorola, MC34115P Datasheet
MC34115P
Available stocks
Related parts for MC34115P
MC34115P Summary of contents
Page 1
... Coincidence Logic Output V/I Analog Output Converter 3 Slope Syllabic Filter 4 Polarity Gain Control Switch Device MC34115P MC34115DW Motorola, Inc. 1996 Order this document by MC34115/D MC34115 SLOPE DELTA SEMICONDUCTOR TECHNICAL DATA SUFFIX PLASTIC PACKAGE CASE 648 SUFFIX PLASTIC PACKAGE CASE 751G (SO–16L) ...
Page 2
... V CC – 1.3 Vdc 1.3 – – 1.3 Vdc A – 0.5 2.5 – 0.5 2.5 – 0.06 0.5 – –0.06 –0.5 A – 0.15 0.8 – 0.02 0.2 – 2 mA/mV 0.1 0.3 – 1.0 10 – MOTOROLA ANALOG IC DEVICE DATA ...
Page 3
... The clock frequency is 16 kHz. Idle channel performance is guaranteed if this dynamic total loop offset is less than one–half of the change in integrator output voltage during one clock cycle (ramp step size). MOTOROLA ANALOG IC DEVICE DATA MC34115 ( Gnd unless otherwise noted.) ...
Page 4
... This input sets the switching threshold for Pins 13, 14 and 15 intended to aid in interfacing different logic families without external parts. Typically it is connected to the reference for CMOS interface or can be biased two diode drops above V EE for TTL interface. input bias resistor, then Pin 10 = 3.66 mA. This is possible only if MOTOROLA ANALOG IC DEVICE DATA ...
Page 5
... MOTOROLA ANALOG IC DEVICE DATA MC34115 minimum high time for the clock input is 300 ns and minimum low time is 900 ns. Pin 15 – Encode/Decode This pin controls the connection of the analog input comparator and the digital input comparator to the internal shift register. If high, the result of the analog comparison will be clocked into the register on the falling edge at Pin 14 ...
Page 6
... 1.5 mA. 2. See Note 3 in the Electrical Characteristics table. 3. See Figures 8 and 9. Voltage and Current CVSD 0.1 I5 MC34115 – Clock 3 14 (16 kHz CVSD MC34115 0. 0 MOTOROLA ANALOG IC DEVICE DATA 0.1 ...
Page 7
... Figure 6, –75 Normalized 1.5 mA) –100 CLK , CLOCK FREQUENCY (kHz) Figure 11. Block Diagram of the CVSD Encoder (t) Comparator Audio In Integrator MOTOROLA ANALOG IC DEVICE DATA MC34115 Figure 8. Normalized Dynamic Integrating Current Match versus CLK = 16 kHz 60 (See Figure 6, 40 Normalized 1.5 mA –20 –40 –60 – ...
Page 8
... Figure 13. Block Diagram of the CVSD Decoder Clock Digital In Sampler Audio Out Integrator 8 MC34115 Figure 12. CVSD Waveforms Integrator Output (Reconstructed Audio) Input Audio Digital Output Level Detect Algorithm Slope Polarity Switch MOTOROLA ANALOG IC DEVICE DATA Slope Magnitude Control ...
Page 9
... MOTOROLA ANALOG IC DEVICE DATA MC34115 + – 9 ...
Page 10
... The bit stream in the channel were from a standard delta modulator with a constant level input. The delta modulator encoder with the CVSD algorithm provides an efficient method for digitizing a voice input in a manner which is especially convenient for digital communications requirements. MOTOROLA ANALOG IC DEVICE DATA ...
Page 11
... Design of low pass filter at the receiver The circuit in Figure 15 is the most basic CVSD circuit possible. For many applications in secure radio or other intelligible voice channel requirements entirely sufficient. MOTOROLA ANALOG IC DEVICE DATA MC34115 Figure 15. 16 kHz Simplex Voice Codec Digital Encode/Decode ...
Page 12
... Having established these three parameters – clock rate, loop gain and minimum step size – the encoder circuit in 0.935 mA Figure 15 will function at near optimum performance for input levels around 0 dBm 0.935 the desired + + 0 62 min; for min 41 min R 2 min R min MOTOROLA ANALOG IC DEVICE DATA ...
Page 13
... R1C1R2C2 R2C2C1 R0 MOTOROLA ANALOG IC DEVICE DATA MC34115 INCREASING CVSD PERFORMANCE The calculation of desired gain resistor R x then proceeds exactly as previously described. Syllabic Filter Design The syllabic filter in Figure simple single–pole network constant for the averaging of the coincidence output signal. The voltage across the capacitor determines the integrator current which in turn establishes the step size ...
Page 14
... C3 – 536 pF R4 – 63. – 1000 pF R5 – 127 k C5 – 222 pF R6 – 365 – – 1.645 M C7 – – – 837 pF R9 – – 536 pF R10 – 29.5 R11 – NOTE: All Res. 0. All Cap. 1% MOTOROLA ANALOG IC DEVICE DATA ...
Page 15
... 0.25 (0.010) –A– –B– 16X 0.010 (0.25 14X K MOTOROLA ANALOG IC DEVICE DATA MC34115 OUTLINE DIMENSIONS P SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE SEATING –T– PLANE SUFFIX PLASTIC PACKAGE CASE 751G–02 (SO–16L) ISSUE 0.010 (0.25 –T– ...
Page 16
... Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “ ...