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AM79535-2DC データシート(PDF) 4 Page - Advanced Micro Devices |
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AM79535-2DC データシート(HTML) 4 Page - Advanced Micro Devices |
4 / 20 page 4 Am7953X Data Sheet PIN DESCRIPTIONS Pin Names Type Description AGND Gnd Analog (quiet) ground. A(TIP) Output Output of A(TIP) power amplifier. BGND Gnd Battery (power) ground. B(RING) Output Output of B(RING) power amplifier. C3–C1 Input Decoder. TTL compatible. C3 is MSB and C1 is LSB. C4 Input Test relay driver command (Am79534). TTL compatible. A logic Low enables the driver. CHCLK Input Chopper clock. Input to switching regulator (TTL compatible). Frequency = 256 kHz (nominal). CHS Input Chopper stabilization. Connection for external stabilization components. DA Input Ring-trip negative. Negative input to ring-trip comparator. DB Input Ring-trip positive. Positive input to ring-trip comparator. DET Output Detector. A logic Low indicates that the selected detector is tripped. The detector is selected by the logic inputs (C3–C1, E0, and E1). The output is open-collector with a built-in 15 k Ω pull-up resistor. DGND Gnd Digital ground. E0 Input Read enable. A logic High enables DET. A logic Low disables DET. E1 Input Ground-key enable. E1 = High connects the ground-key detector to DET, and E1 = Low connects the off-hook or ring-trip detector to DET. GKFIL Capacitor Ground-key filter capacitor connection ( Am79535). An external capacitor for filtering out high-frequency noise from the ground-key loop can be connected to this pin. An internal 36 k Ω, – 20%, +40% resistor is provided to form an RC filter with the external capacitor. In versions that have a GKFIL pin, 3.3 nF minimum capacitance must be connected from the GKFIL pin to ground. HPA Capacitor High-pass filter capacitor; A(TIP) side of high-pass filter capacitor. HPB Capacitor High-pass filter capacitor; B(RING) side of high-pass filter capacitor. LOutput Switching regulator power transistor. Connection point for filter inductor and anode of catch diode. This pin has up to 60 V of pulse waveform on it and must be isolated from sensitive circuits. Keep the diode connections short because of the high currents and high di/dt. QBAT Battery Quiet battery. Filtered battery supply for the signal processing circuits. RD Resistor Detect resistor. Threshold modification and filter point for the off-hook detector. RDC Resistor DC feed resistor. Connection point for the DC feed-current programming network which also connects to the Receiver Summing Node (RSN). VRDC is negative for normal polarity and positive for reverse polarity. RINGOUT Output Ring relay driver; sourcing from BGND with internal diode to QBAT. RSN Input Receive summing node. The metallic current ( AC and DC) between A(TIP) and B(RING) is equal to 1000 times the current into this pin. The networks that program receive gain, two-wire impedance, and feed current all connect to this node. This node is extremely sensitive. Route the 256 kHz chopper clock and switch lines away from the RSN node. TESTOUT Output Test relay driver (Am79534); sourcing from BGND with internal diode to QBAT. TP Thermal Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT). Leave as open circuit or connected to QBAT. In both cases, the TP pins can connect to an area of copper on the board to enhance heat dissipation. VBAT Battery Battery supply through an external protection diode. VCC Power +5 V power supply. VEE Input –5 V power supply. VREG Input Regulated voltage. Provides negative power supply for power amplifiers and connection point for inductor, filter capacitor, and chopper stabilization. VTX Output Transmit audio. This output is a unity gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the two-wire input impedance-programming network connects here. |
同様の部品番号 - AM79535-2DC |
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同様の説明 - AM79535-2DC |
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