HC55185 Intersil Corporation, HC55185 Datasheet
HC55185
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HC55185 Summary of contents
Page 1
... Integrated test access features are also offered on selected products to support loopback testing as well as line measurement tests. There are five product offerings of the HC55185 with each version providing voltage grades of high battery voltage and longitudinal balance. The voltage feed amplifier design uses low fi ...
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... LONGITUDINAL FULL BALANCE TEST 75V 58dB 53dB HC55185A HC55185B SHD GKD SHD GKD n/a n/a SHD GKD RTD RTD SHD GKD SHD GKD n/a n/a HC55185 (PLCC) TOP VIEW SW+ 5 SW- 6 SWC TEMP ...
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... Receive Input Impedance (Note 2) Transmit Output Impedance (Note 2) 4-Wire Port Overload Level 2-Wire Port Overload Level 2-Wire Return Loss 2-Wire Longitudinal Balance (Notes 4, 5) 4-Wire Longitudinal Balance 4-3 HC55185 o Thermal Information = 25 C Thermal Resistance (Typical, Note 1) PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Maximum Junction Temperature Plastic . . . . . . . . . . . . . . . . 150 Maximum Storage Temperature Range ...
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... LOOP DETECTORS AND SUPERVISORY FUNCTIONS Switch Hook Programming Range Switch Hook Programming Accuracy Dial Pulse Distortion Ring Trip Comparator Threshold Ring Trip Programming Current Accuracy Ground Key Threshold Thermal Alarm Output 4-4 HC55185 - for industrial (I) grade and -24V -100V, -85V or -75V, V ...
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... Tip Open, BSEL = 0 Power Denial, BSEL = HOOK POWER DISSIPATION (Note 6) Forward or Reverse Low Power Standby Ringing OFF HOOK POWER DISSIPATION (Note 6) Forward or Reverse POWER SUPPLY REJECTION RATIO 4-5 HC55185 - for industrial (I) grade and -24V -100V, -85V or -75V ...
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... HC55181BIM, HC55182BIM HC55181CIM, HC55182CIM HC55181DIM, HC55182DIM HC55183ECM, HC55184ECM Any of the HC55185 products may be used without the battery switch function by shorting the supply pins VBL and VBH together. This provides compatibility with HC55180 type applications which do not require the battery switch. Application Circuit Modifications The HC55185 basic application circuit is nearly identical to that of the HC55180 thru HC55184 ...
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... Parametric Improvements The most significant parametric improvement of the HC55185 is reduction in Idle Channel Noise. This improvement was accomplished by redistributing gains in the impedance matching loop. The impact to the application circuit is the change in the impedance programming resistor RS. The redistribution of gains also improves AC performance at the upper end of the voice band. ...
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... The required impedance is defined by the terminating impedance and protection resistors as shown in Equation – 4-8 HC55185 4-WIRE TO 2-WIRE GAIN The 4-wire to 2-wire gain is defined as the receive gain function of the terminating impedance, synthesized impedance and protection resistors. Equation 8 calculates the receive gain (EQ ...
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... Ring terminal. When the high battery voltage exceeds the MTU reference of -49V (typically), the 4-9 HC55185 Ring terminal will be clamped by the internal reference. The same Ring relationships apply when operating from the low battery voltage. For high battery voltages (VBH) less than or ...
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... A low pass filter is used in the feedback to block voice band signals from interfering with the loop current limit function. The pole of the low pass 4-10 HC55185 filter is set by the external capacitor C external capacitor should be 4.7 F. Most applications will operate the device from low battery while off hook ...
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... The AC feed back loop produces an echo at the V of the signal injected The echo must be cancelled to RX 4-11 HC55185 maintain voice quality. Most applications will use a summing amplifier in the CODEC front end as shown below to cancel the echo signal. (EQ. 24) 1:1 R FIGURE 8 ...
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... Power Dissipation The power dissipation equations for forward active operation also apply to the reverse active mode. 4-12 HC55185 Ringing Overview The ringing mode (RNG, 100) provides linear amplification to support a variety of ringing waveforms. A programmable ring trip function provides loop supervision and auto disconnect upon ring trip ...
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... REN LOOP The silent interval power dissipation will be determined by the quiescent power of the selected operating mode. 4-13 HC55185 Forward Loop Back Overview The Forward Loop Back mode (FLB, 101) provides test capability for the device. An internal signal path is enabled allowing for both DC and AC verification. The internal 600 terminating resistor has a tolerance of 20% ...
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... All operating modes of the device will operate from high or low battery except forward loop back. 4-14 HC55185 Functionality The logic control is independent of the operating mode decode. Independent logic control provides the most flexibility and will support all application configurations ...
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... With independent logic control and the blocking diode, the uncommitted switch may be continuously connected to the Tip and Ring terminals. 4-15 HC55185 Basic Application Circuit SWC FIGURE 15. HC55185 BASIC APPLICATION CIRCUIT TABLE 4. BASIC APPLICATION CIRCUIT COMPONENT LIST COMPONENT U1 - Ringing SLIC ...
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... DC Biasing Filter Capacitor - Connects between this pin and V 25 RTD Ring trip filter network. 26 ILIM Loop Current Limit programming resistor Switch hook detection threshold programming resistor. 28 RING RING power amplifier output. 4-16 HC55185 DESCRIPTION o C) and the device has been powered down automatically ...
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... For information regarding Intersil Corporation and its products, see web site www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (321) 724-7000 FAX: (321) 724-7240 4-17 HC55185 N28.45 0.004 (0.10 LEAD PLASTIC LEADED CHIP CARRIER PACKAGE 0.025 (0.64) R 0.045 (1.14) SYMBOL ...