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AM79574JC Datasheet(PDF) 4 Page - Advanced Micro Devices |
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AM79574JC Datasheet(HTML) 4 Page - Advanced Micro Devices |
4 / 17 page 4 Am79574 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. TTL compatible. Logic Low enables the driver. CHCLK Input Chopper clock. Input to switching regulator (TTL compatible). Freq = 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. Logic Low indicates that the selected detector is tripped. Logic inputs C3–C1, E1, and E0 select the detector. Open-collector with a built-in 15 k Ω pull-up resistor. DGND Gnd Digital ground E0 Input A logic High enables DET. A logic Low disables DET. E1 Input 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. 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 Filtered battery supply for the signal processing circuits. RD Resistor Detector 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 The metallic current (AC and DC) between A(TIP) and B(RING) = 1000 x the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance 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. Source 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. Connected through an external protection diode. 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. Unity gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the two-wire input impedance programming network. |
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