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| AN6425K Speech Network Circuit s Overview The AN6425K is a high-function speech network IC with speaker amplifier. It incorporates a transmitter-system non-linear circuit, receiver digital VRs, etc. and is suitable for realizing the multifunctional telephone sets. 26.70.3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 8.40.3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 Unit : mm 0.50.1 0.90.25 1.050.25 4.80.25 3.050.25 0.3 + 0.1 5 - 0.0 s Features * Speech network IC for the multifunctional telephone sets * Capable of interfacing with the light-weight small receivers and ECM transmitters * Built-in 2V REG constant voltage source (2V typ) for ECM * Built-in non-linear circuits in the transmitter and receiver systems in order to eliminate ambient noises * Built-in speaker amplifier and capable of driving with a main wire current * Built-in hold-tone amplifier, key-in-tone amplifier, and DTMF transmitter, and capable of setting the mode with the control pins * Automatic gain control (automatic pad function) according to a circuit curret * Built-in tertiary active filter circuit and capable of sending a DTMF circuit with much higher harmonic at a low distortion factor * Built-in single touch receiver volume-up function (about 6dB) 3 to 15 10.160.25 28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B) s Block Diagram VL 28 27 26 25 24 23 CLASS B BTL SP Amp. CLASS A Push pull 1V 2V REG 2V HT TT in + REC DRIVER REC DRIVER 22 21 20 80k - 19 18 17 16 15 + - D5dB D3dB D6dB REC in DVR + - 30k 2k 30k 40k 2k KT 4k 1V REFF 1V VL Battery Selector 65k 1 2 3 4 5 6 SEND Amp D12 dB Filter Amp. D3dB MUTE MIC in Logic INV NAND 7 8 9 10 11 12 13 14 GND 1.778 s Absolute Maximum Ratings (Ta=25C) Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature * VCC x ICC <1200mW Symbol VL IL PD Topr Tstg Rating 14.4 * 120 * 1200 * -20 to + 65 -55 to +150 Unit V mA mW C C s Recommended Operating Range (Ta=25C) Parameter Operating supply voltage range Symbol VL Range 3 to 12V s Electrical Characteristics (Ta=25C) Parameter Receiver gain Symbol GV (REC) THD (REC) VO (REC) AP (REC) MUTE (REC) Condition Open between the Pins19 and 20. Measure the output between the Pins22 and 23 when a signal (-55dBm) is input to the Pin18. Open between the Pins19 and 20. Measure the output distortion factor between the Pins 22 and 23 when a signal (-55dBm) is input to the Pin18. min 48 typ 50.5 max 53 Unit dB Receiver distortion factor 1 5 % Receiver maximum output voltage D Automatic pad D Receiver noise prevention Receiver D digital VR Receiver noise output Transmitter gain DVR Vno (REC) GV (SEND) THD (SEND) VO (SEND) AP (SEND) Vno (SEND) GV (HOLD) GV (TOUCH) THD (TOUCH) Input a signal to the Pin18 and measure the output between the Pins22 and 23 at an output distortion factor of 5%. Input a signal (-45dBm) to the Pin18 and measure an output change between the Pins22 and 23 when IL changes from 80mA to 30mA. Input a signal (-45dBm) to the Pin18 and measure an output change between the Pins 22 and 23 when the Pin12 changes from no microphone input signal to -40dBm. Input a signal (-45dBm) to the Pin18 and measure an output change between the Pins 22 and 23 when the Pin12 is set from H to L. Measure the output between the Pins22 and 23 when there is no signal at the Pin18. Open bitween the Pins3 and 6. Measure the output between the Pins28 and 1 when a signal (-45dBm) is input to the Pin12. Open between the Pins3 and 6. Measure the output distortion factor between the Pins28 and 1 when a signal (-45dBm) is input to the Pin12. 0 +3 dBm -6 -3 -1.5 dB -7 -5 -3 dB 4 6 -50 8 -45 45 dB dBm dB 40 42.5 Transmitter distortion factor 1.5 5 % Transmitter maximum transmission level Transmitter D automatic pad Transmitter noise prevention HOLD TONE gain TOUCH TONE gain TOUCH TONE distortion factor Input a signal to the Pin12 and measure the output between the Pins28 and 1 at an output distortion factor of 5%. Input a signal (-35dBm) to the Pin12 and measure an output change between the Pins 28 and 1 when IL changes from 80mA. Measure the output between the Pins28 and 1 when there is no signal at the Pin18. Ground the Pin24. Input a signal (-30dBm) to the Pin17 and measure the output change between the Pins 28 and 1. Ground a signal (-45dBm) to the Pin16 and measure the output between the Pins28 and 1. Ground the Pin14. Input a signal (-45dBm) to the Pin16 and measure the output distortion factor between the Pins 28 and 1. 2 5 dBm -6 -3 -65 -1.5 -60 29.5 dB dBm dB 23.5 26.5 39 41.5 44 dB 1 3 % * IL=30mA and Freq=1kHz unless otherwise specified. s Electrical Characteristics (cont.) (Ta=25C) Parameter TOUCH TONE D automatic pad Symbol AP (TOUCH) GV (SP) THD (SP) Condition Ground the Pin14. Input a signal (-45 dBm) to the Pin16 and measure an output change between the Pins 28 and 1 when IL changes from 80mA to 30mA. Ground the Pin15. Input a signal (-50dBm) to the Pin24 and measure the output between the Pins 25 and 26. Ground the Pin15. Input a signal (-50dBm) to the Pin24 and measure the output distortion factor between the Pins 25 and 26. min -6 typ -3 max -1.5 Unit dB SP amplifier gain 45 50 dB SP distortion factor 10 % * IL=30mA and Freq=1kHz unless otherwise specified. s Pin Descriptions Pin No. 1 Pin name GND Typical waveform DC 0V Description Ground pin. Connect to the output of the diode bridge. 2V internal stabillized power supply output pin. Connect to GND via 220F. The current obtainable from this pin is 5mA or less (at IL=20mA). Equivalent circuit 2 2 2V REG DC 2V 2V REG 3 1V REF DC 1V 1V reference coltage output pin. Connect to GND via 47F. No current is allowed to be input/output from this pin. VCC - + 3 10k 1V 4 BT DC 0 to 6V (Supplied from Outside) External battery connection pin. Connect the 3 to 6V battery to GND. Connect to GND directly when the BT function is not used. Vref 65.3k VL 5 SEND OUTPUT SEND DRIVER 0.3V 6 Vref Transmitter output. Transmitter gain control pin. Controls the gain and frequency characteristic of the transmitter system with external C and R. 5 VCC 6 VL 7 1/2VL DC 5/7 x VL Automatic pad control pin. Capable of controlling the pad operating point with the external resistor. 20k 7 47k s Pin Descriptions (cont.) Pin No. Pin name Typical waveform W/o External Capafitor Description Equivalent circuit VCC VCC 8 Mute Noise precentice peak hold pin. Connect to GND via 10F. 8 DC W/External Capafitor VCC 9 LPF (1) Transmitter filter pin. Constitutes the tertiary active filter with the external parts C and R, and capable of controlling the high-pass transmitter frequency characteristic. 9 VCC 40k 10 LPF (2) 10 VCC + - 11 LPF (3) 11 VCC VCC 10k 12 MIC input 1V Microphone input pin. Input pin for the microphone. 12 VCC 13 HC 0V Hole Tone Mode HOLD TONE control pin. The HOLD TONE transmission mode is set by setting this pin to Low. 10k 13 VCC 14 DMC 0V DTMF Transmission Mode DIAL MUTE control pin. The DTMF transmission mode is set by setting this pin to Low. 10k 14 VCC 15 SPC Speaker Mode 0V SPEAKER control pin. The speaker mode is set by setting this pin to Low. 10k 15 VCC Vref 10k 16 TT input 1V DTMT signal input pin. Inputs a DTMF signal. A signal is sent to the circuit when the Pin14 is at Low. 16 - + VCC VCC VCC s Pin Descriptions (cont.) Pin No. Pin name Typical waveform Description Equivalent circuit VCC KT/HT 1V 30k KT/HT input 17 DVR input 0V KT/HT signal input pin, Digital VR ON Pin. Inputs a KEY IN TONE or HOLD TONE signal. If the Pin14 is set to Low, the KT signal is output to the receiver, and if the Pin13 is set to Low, the HT signal is output to the curcuit and speaker. The receiver gain is improved 6dB by setting this pin to Low instantaneously. 45k Vref VCC + - 16 4k Digital VR ON VCC Vref 18 REC input 1V Receiver signal input pin. Inputs a receiver signal from the side tone preventive circuit network. 18 VCC VCC 10k 10k 82k - + VCC 19 REC NFB 1V 20 REC output 1V Receiver gain control pin, Receiver signal output pin. Capable of controlling the frequency characteristic and gain of the receiver system with the external parts C and F of the Pins19 and 20. The receiver signal/HOLD TONE signal/KEY IN TONE signal is output to the Pin20 by the HC/DMC/SPC control. 19 20 VCC VCC VCC 21 Driver input Driver output (1) Driver output (2) 22 1V + - 21 2k 22 1V 1V Receiver amplifier signal input pin, Receiver output (1) pin, Receiver output (2) pin. Inputs a receiver signal from the Pin20 to the Pin21. BTL output at the Pins20 and 23. 23 2k Vref VCC Vref 2k + - 23 2k VCC Vref 10k 24 SP input 1V Speaker amplifier signal input pin. Inputs a receiver signal from the Pin20. 24 s Pin Descriptions (cont.) Pin No. Pin name Typical waveform Description 25 Equivalent circuit 25 SP out (1) 1V 26 SP out (2) 1V Speaker output (1) pin, Speaker output (1) pin. Output of the class-A differential amplifier and connected to the speaker through the transformer (300) with intermediate tap. 26 VL 27 BS DC 1 to 8V Power supply boot strap pin. Connects to the Pin28 via 47F. The DC resistance of the communication circuit is determined by connecting an external resistor to GND. 2k 27 50 28 VL 3 to 10V Supply current input pin. Connects to the + output of the diode bridge. s Supplementary Descriptions * Electrical Characteristics Design Reference Values (Ta=25C) Parameter KEY IN TONE gain Transmitter noise preventive attenuation Transmitter noise preventive selector level Low impedance drive DC resistance (1) DC resistance (2) AC impedance (1) AC impedance (2) Internal regulator voltage Internal reference voltage Symbol GV (KEY) MUTE (SEND) MUTE (MIC) RL (REC) RDC (1) RDC (2) ZAC (1) ZAC (2) VREG VREF Condition Measure the output between the Pin22 and 23 when key input (Pin17)=-40dBm. To the Pin8 - GND REC output -1dB R (REC)=130, Input=-50dBm With IL=20mA, measure the DC voltage at the Pin28 when connecting 6.2k between the Pins27 and 1. With IL=100mA, measure the DC voltage at the Pin28 when connecting 6.2k between the Pins27 and 1. min typ 40 -14 -62 35 3.8 10 2 1.5 2 1 max Unit dB dB dBm dB V V k k V V Measure the AC impedance between the Pins28 and 1 at IL=20mA. Measure the AC impedance between the Pins28 and 1 at IL=100mA. Measure the DC voltage at the Pin2 at IL=30mA. Measure the DC voltage at the Pin3 at IL=20mA. Note) The above characteristics are design reference values and not guaranteed values. s Characteristics Curve VL- IL 12 4 Characterristic Impedance 28 33F Receiver Automatic Pad Characteristics -2 REC IN=-55dBm 10 33F Circuit Voltage VL (V) 3 8 VL 6 LF Imoedance Analyzer (f=1kHz) Receiver Output Vout (REC) (dBm) IC AC Impedance ZAC (k) -4 Vout (REC) -6 2 4 27 28 820 1 + 33F -8 2 6.2k 0 0 0 20 40 60 80 100 120 0 20 40 60 80 100 120 -10 0 20 40 60 80 100 120 Circuit Current IL (mA) Circuit Current IL (mA) Circuit Current IL (mA) Receiver Mute Receiver Output Vout (REC) (dB) REC IN=Constant 22k 6 3 Microphone Automatic Pad Characteristics -2 Mic. Input=-40dBm 6 3 Transmitter I/O Characteristics +20 +10 0 -10 Vout (MIC) 6 3 22k -6 -8 -10 -12 -14 -16 Vout (MIC) Circuit Output Vout (MIC) (dBm) Circuit Output Vout (TT) (dBm) -4 IL=30mA fin=1kHz Open 6 3 0.001F 0 -2 Vout (REC) -4 -20 -30 22k 28 820 + 33F -40 -50 -60 -80 -6 -8 -90 -80 -70 -60 -50 -40 -30 -18 0 20 40 60 80 100 120 -70 -60 -50 -40 -30 -20 Microphone Input Vin (MIC) (dBm) Circuit Current IL (mA) Microphone Input Vin (MIC) (dBm) TT (DTMF) Automatic Pad Characteristics 6 6 3 TT I/O Characteristics 20 Open 10 0 -10 6 3 6 3 Speaker I/O Characteristics +20 +10 0 -10 -20 -30 -40 THD (SP) -50 -60 -80 Vout (SP) 10 8 6 4 2 0 -20 Circuit Output Vout (MIC) (dBm) 2 Vout (TT) 0 -2 -4 -6 -8 -10 Closed Circuit Characteristics -20 -30 -40 -50 -60 -80 22k IL=30mA fin=1kHz -70 -60 -50 -40 -30 -20 0 20 40 60 80 100 120 Speaker Output Vout (SP) (dBm) Circuit Output Vout (TT) (dBm) 4 22k TT Input=-40dBm -70 -60 -50 -40 -30 Circuit Current IL (mA) Touch Tone Input Vin (TT) (dBm) SP Input Vin (SP) (dBm) Total Harmonic Distortion THD (SP) (%) IL=30mA fin=1khz L2 6.8k + L1 SP Stablized Power Supply 47F/16V + + 47F/ 16V SP 8 8.2k 10F/16V 10F/16V + s Application Circuit SP AGC circuit 3V 2.2k 100k 2.7k + + 47F/16V 47F/16V + 33k 33k 68k 1k 0.01F 10k 0.01F 2.2k 4.7k Balancing Network 2.2F/ 50V + 0.022F 1k 47F/ 16V 0.01F 12k 470F/6.3V 27 2 + 47F/16V 4 33 5 0.47F 6 10F/16V 8 10F/16V 9 + + + 330 28 1 3 0.022F 1.8k 26 25 24 0.068F 23 3.3k 22 6.2k + 47F/16V VR1 1k 1k 0.22F 21 6.8k 20 0.001F 0.01F 0.01F Piezo-electric Receiver AN6425K 7 0.0015F 0.033F 2.2k 0.15 F 2.2k 0.0047F 47k 10 11 19 18 0.068F 12 10k 0.033F 13 16 HC DMC ECM 14 17 0.22F 0.1F 0.0022F 15 SPC 10k MF 100kB 0.0082F |
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