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AM79514-1JC Arkusz danych(PDF) 4 Page - Advanced Micro Devices |
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AM79514-1JC Arkusz danych(HTML) 4 Page - Advanced Micro Devices |
4 / 18 page 4 Am79514 Data Sheet PIN DESCRIPTIONS Pin Names Type Description AGND Gnd Analog 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 Inputs Decoder. TTL compatible. C3 is MSB and C1 is LSB. C4 Input Test relay driver command. TTL compatible. A logic High enables the driver. DGND Gnd Digital ground. 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. When enabled, a logic Low indicates that the selected detector is tripped. The detector is selected by the logic inputs (C3–C1 and E1). The output is open-collector with a built-in 15 k Ω pull-up resistor. 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. 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. L Output Switching regulator power transistor. Connection point for filter inductor and anode of catch diode. This pin will have up to 60 V of pulse waveform on it and must be isolated from sensitive circuits. Extreme care must be taken to 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. An external 100 Ω, 1/8 Ω resistor must be connected between QBAT and VBAT pins. 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. The other end of the network connects to the receiver summing node (RSN). The sign of VRDC is negative for nor- mal 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 (both 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. Care should be taken to route the 256-kHz chopper clock and switch lines away from the RSN node. TESTOUT Output Test relay driver. 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. VCC Power +5 V power supply. VEE Power –5 V power supply. VREG Input Regulated voltage. Provides negative power supply for power amplifiers, 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. The other end of the two-wire input impedance programming network connects here. |
Podobny numer części - AM79514-1JC |
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Podobny opis - AM79514-1JC |
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