Electronic Components Datasheet Search |
|
HC5549CM Datasheet(PDF) 5 Page - Intersil Corporation |
|
HC5549CM Datasheet(HTML) 5 Page - Intersil Corporation |
5 / 13 page 5 FN4539.3 Design Equations Loop Supervision Thresholds SWITCH HOOK DETECT The switch hook detect threshold is set by a single external resistor, RSH. Equation 1 is used to calculate the value of RSH. The term ISH is the desired DC loop current threshold. The loop current threshold programming range is from 5mA to 15mA. GROUND KEY DETECT The ground key detector senses a DC current imbalance between the Tip and Ring terminals when the ring terminal is connected to ground. The ground key detect threshold is not externally programmable and is internally fixed to 12mA regardless of the switch hook threshold. RING TRIP DETECT The ring trip detect threshold is set by a single external resistor, RRT. IRT should be set between the peak ringing current and the peak off hook current while still ringing. The capacitor CRT, in parallel with RRT, will set the ring trip response time. Loop Current Limit The loop current limit of the device is programmed by the external resistor RIL. The value of RIL can be calculated using Equation 3. The term ILIM is the desired loop current limit. The loop current limit programming range is from 15mA to 45mA. Impedance Matching The impedance of the device is programmed with the external component RS. RS is the gain setting resistor for the feedback amplifier that provides impedance matching. If complex impedance matching is required, then a complex network can be substituted for RS. RESISTIVE IMPEDANCE SYNTHESIS The source impedance of the device, ZO , can be calculated in Equation 4. The required impedance is defined by the terminating impedance and protection resistors as shown in Equation 5. ON HOOK POWER DISSIPATION Forward or Reverse BSEL = 0 - 44 60 mW Forward or Reverse BSEL = 1 - 90 150 mW Low Power Standby BSEL = 1 - 37 60 mW OFF HOOK POWER DISSIPATION Forward or Reverse BSEL = 0 - 290 310 mW POWER SUPPLY REJECTION RATIO VCC to 2-Wire f = 300Hz - 40 - dB f = 1kHz - 35 - dB f = 3.4kHz - 28 - dB VCC to 4-Wire f = 300Hz - 45 - dB f = 1kHz - 43 - dB f = 3.4kHz - 33 - dB VBL to 2-Wire 300Hz ≤ f ≤ 3.4kHz - 30 - dB VBL to 4-Wire 300Hz ≤ f ≤ 3.4kHz - 35 - dB VBH to 2-Wire 300Hz ≤ f ≤ 3.4kHz - 33 - dB VBH to 4-Wire 300Hz ≤ f ≤ 1kHz - 40 - dB 1kHz < f ≤ 3.4kHz - 45 - dB Electrical Specifications Unless Otherwise Specified, TA = -40°C to 85°C, VBL = -24V, VBH = -48V, VCC = +5V, AGND = BGND = 0V, loop current limit = 25mA. All AC Parameters are specified at 600 Ω 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz. Protection resistors = 0 Ω. (Continued) PARAMETER TEST CONDITIONS MIN TYP MAX UNITS RSH 600 ISH ⁄ = (EQ. 1) RRT 1800 IRT ⁄ = (EQ. 2) RIL 1760 ILIM ------------- = (EQ. 3) RS 400 ZO () = (EQ. 4) ZO ZL 2RP – = (EQ. 5) HC5549 |
Similar Part No. - HC5549CM |
|
Similar Description - HC5549CM |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |