PDF MH88400-1 Data sheet ( Hoja de datos )

Número de pieza	MH88400-1
Descripción	Line Interface Circuit Preliminary Information
Fabricantes	Mitel Networks
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No Preview Available ! MH88400 ® Line Interface Circuit Preliminary Information Features • FAX and Modem interface • Suitable for V.29 FAX & V.22 bis Data • Allows caller identification • Variants match German, UK, 600Ω & 900Ω network impedances • Isolation circuitry conforms to international PTT requirements • Transformerless 2-4 Wire conversion • Loop start operation • Pulse and DTMF operation • Accommodates external monitor phone • Line state detection outputs: -loop current/ringing outputs -monitor phone switch hook • Single +5V operation Applications Interface to Central Office for: • DAA • Modem • FAX • Answering Machine • Terminal Equipment ISSUE 1 April 1995 Ordering Information MH88400-1 14 Pin DIL Package MH88400-2 14 Pin DIL Package MH88400-3 14 Pin DIL Package 0°C to 70°C Description The Mitel MH88400 Line Interface Circuit provides a complete audio and signalling link between audio equipment and central office. The functions provided by the MH88400 include 2-4 Wire conversion, loop seizure, external monitor phone switch hook status and ringing voltage and loop current detection. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit design, high voltage isolation and very high reliability. Variants are provided to meet German (-1) and UK (-3) and general 600Ω (-2) line impedance (see section on Line Impedances). Isolation Barrier TIP RING TXIN TF RLS PHS Active Termination Transformer Isolation Power Supply Opto- Isolation Audio Buffer Opto- Isolation Logic Input Buffer VDD AGND VR LC Audio Input Buffer Input Buffer Opto- Isolation Audio Buffer Opto- Isolation Ring &Loop Buffer VX RVLC NETWORK CONNECTIONS Opto- Isolation Switch Hook Buffer SHK USER CONNECTIONS Figure 1 - Functional Block Diagram 2-11 1 page Preliminary Information MH88400 DC Electrical Characteristics † Characteristics Sym Min Typ‡ Max Units Test Conditions 1 Supply Current 2 Power Consumption IDD 15 mA PC 75 mW 3 Low Level Output Voltage RVLC High level Output Voltage 4 SHK Low Level Input Voltage 5 High level Input Voltage High Level Input Current Low Level Input Current VOL VOH VIL VIH IIH IIL 3.8 3.5 0.4 V V 0.9 V V 0.6 mΑ 1 µA † DC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡ Typical figures are at 25°C with nominal+ 5V supplies and are for design aid only. Note: See figure 3a and 3b. VDD = 5.0V, ILoop=40mA VDD = -5.0V,ILoop=40mA IOL = 1.0mA IOH = 1.0mA VIH = 5.0V VIL = 0.0V AC Electrical Characteristics† - MH88400 All Variants Characteristics Sym Min Typ‡ Max Units Test Conditions 1 Input Impedance VR 2 Output Impedance at VX 3 Transmit Gain (2-Wire to VX) 4 Frequency Response Gain (relative to Gain @ 1kHz) 5 Receive Gain (VR to 2-wire) 47 kΩ 5Ω dB Input 0.5V at 1kHz off- -0.4 hook -2.4 dB 300 Hz -3.0 dB 3400 Hz dB Input 0.5V at 1kHz 3.5 6 Frequency Response Gain (relative to Gain @ 1kHz) 0 dB 300 Hz 0 dB 3400 Hz 7 Signal Output Overload Level at 2-Wire at Vx 8 Total Harmonic Distortion THD at 2-wire at VX 9 Power Supply Reject Ratio PSRR at 2-wire at VX -3.0 0.0 +2.0 -3.0 0.0 +2.0 0.9 1.2 35 10 dBm dBm dBm dBm dBm dBm % % dB dB THD <5% @ 1kHz ILoop =10-40mA VDD=4.5V VDD=5.0V VDD=5.5V VDD=4.5V VDD=5.0V VDD=5.5V Input 0.5V at 1kHz DC loop = 1000Ω VDD=5.0V Ripple 0.1V,1kHz on VDD † AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated. ‡ Typical figures are at 25°C and are for design aid only. Note 1: All of the above characteristics use a test circuit as per Figure 3. Note 2: All of the above test conditions use a test source impedance which matches the device’s impedance. Note 3: dBm is referenced to 600Ω unless otherwise stated. Note 4: THD is measured with a “Weight” filter. 2-15 5 Page

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Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
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MH88400-2	Line Interface Circuit Preliminary Information	Mitel Networks
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