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AM79R70 Datenblatt(PDF) 5 Page - Advanced Micro Devices |
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AM79R70 Datenblatt(HTML) 5 Page - Advanced Micro Devices |
5 / 20 page SLIC Products 5 PIN DESCRIPTIONS Pin Names Type Description AGND/DGND Gnd Analog and digital ground are connected internally to a single pin. A(TIP) Output Output of A(TIP) power amplifier. B2EN Input VBAT2 enable. Logic Low enables operation from VBAT2. Logic High enables operation from VBAT1. TTL compatible. 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. D1 Input Relay1 control. TTL compatible. Logic Low activates the Relay1 relay driver. D2 Input (Option) Relay2 control. TTL compatible. Logic Low activates the Relay2 relay driver. DET Output Detector. Logic Low indicates that the selected detector is tripped. Logic inputs C3–C1 and E1 select the detector. Open-collector with a built-in 15 k Ω pull-up resistor. E1 Input (Option) A logic High selects the off-hook detector. A logic Low selects the ground-key detector. TTL compatible. 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. 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. RDCR — Connection point for feedback during ringing. RINGIN Input Ring Signal Input. Pin for ring signal input. Square-wave shaped by external RC filter. Requires 50% duty cycle. CMOS-compatible input. RSGH Input Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating from VBAT1. RSGL Input Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when operating from both VBAT1 and VBAT2. RSN Input The metallic current (AC and DC) between A(TIP) and B(RING) is equal to 1000 x the current into this pin. The networks that program receive gain, two-wire impedance, and feed resistance all connect to this node. RTRIP1 Input Ring-trip detector. Ring-trip detector threshold set and filter pin. RTRIP2 Input Ring-trip detector threshold offset (switch to VBAT1). For power conservation in any nonringing state, this switch is open. RYE Output Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2. Normally connected to relay ground. RYOUT1 Output Relay/switch driver. Open-collector driver with emitter internally connected to RYE. RYOUT2 Output (Option) Relay/switch driver. Open-collector driver with emitter internally connected to RYE. VBAT1 Battery Battery supply and connection to substrate. VBAT2 Battery Power supply to output amplifiers. Connect to off-hook battery through a diode. VCC Power Positive analog power supply. VNEG Power Negative analog power supply. This pin is the return for the internal VEE regulator. VTX Output Transmit Audio. This output is a 0.5066 gain version of the A(TIP) and B(RING) metallic AC volt- age. VTX also sources the two-wire input impedance programming network. |
Ähnliche Teilenummer - AM79R70 |
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Ähnliche Beschreibung - AM79R70 |
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