Maker : Xecom
Part No. : XEV90

  Datasheet PDF : XEV90.pdf
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Product Information

www.DataSheet4U.com XEV90 7-99 56 KBPS DAA in a PLCC Package Description Xecom’s XEV90 is a complete DAA integrated into a compact PLCC package. The XEV90 supports analog data transfer to 56 KBPS. The 68-Pin PLCC package permits automated, high-volume assembly. The XEV90 does not sacrifice performance for small size and surface-mount convenience. The heart of the XEV90 is a proprietary, low profile, low distortion transformer. This wide bandwidth, low distortion device provides the clear signal path required for 56 KBPS analog data transfer. Like all Xecom DAA's the XEV90 is a complete telephone line interface. It includes the telephone line transformer, line current holding circuit, hookswitch and ring indicator. The XEV90 replaces the dozens of components found in a discrete DAA design. Features * Package: 68-Pin PLCC (only 18 pins used) dimensions 0.952 inches by 0.952 inches by 0.170 inches high * Meets Total Harmonic Distortion requirements for reliable 56 Kbps modems (-85 dB typical); * Integrated Low-Distortion Telephone Line Transformer * Integrated Ring Detection with active high and active low ouput signals * Operates on either a single Power Supply of +5 or + 3 Volts; * Solid-State Hookswitch Control with active high and active low inputs; * FCC Part 68 Compliant; * Extended Temperature Range available; Figure 1: XEV90 BLOCK DIAGRAM MUTE L1 L2 DC2 DC1 T1 T2 Line Transformer Line Current Holding Circuit Billing Tone Filter (Optional) Tip Ring Low Impedance Dialing OH(+) OH(-) RI(+) RI(-) Ring Detector Hookswitch XECOM XEV90 Figure 2: XEV90 Pin Configuration N/C Ring Tip N/C L2 L1 N/C DC1 DC2 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 XEV90 (top) RI(-) RI(+) OH(+) T1 T2 /Mute OH(-) VCC Gnd Pin Descriptions PIN 1 2 NAME DESCRIPTION N/C Ring No Connection Ring is one wire of the two-wire telephone line connection (RJ11 Pin 4). FCC Part 68 Rules require a 1500 volt isolation barrier between the telephone line and all other circuits. This isolation must be preserved throughout the system. Xecom recommends 0.100 inch spacing between traces connected to Ring and all other conductors to preserve this isolation. Tip is one wire of the two-wire telephone line connection (RJ11 Pin 3). The telephone company places a DC "Battery" voltage across Tip and Ring on all public switched telephone lines. The XEV90 accepts this line battery voltage without regard to its polarity. No Connection L1 and L2 provide the connective points for a billing tone filter when required. No Connection DC1 and DC2 control performance of the line current holding circuit. A jumper from DC1 to DC2 limits DC loop current to 60 milliamps. An open circuit between DC1 and DC2 permits loop currents up to 100 milliamps as required for North America. A resistor may be placed between DC1 and DC2 to alter the off-hook impedence to meet unique country requirements. Ground connection to the XEV90. This signal provides the reference for the OH output and RI input. This pin should be connected to the systems digital ground. +5 Volt power source for the XEV90. VCC powers the RI and OH control lines. Modem switch-hook control: OH(-), an active low input, for controls the switch hook in the XEV90. When the host activates pin 12, the switch-hook closes and the XEV90 seizes the local telephone line. Pin 16 provides an active high switch-hook control. OH(-) should remian open when using OH(+). The host can pulse OH(-) line to perform rotary dialing. The normal pulse rate is ten pulses per second. Closing the switch-hook creates a series of pulses. Dial one pulse for the digit one to ten pulses for the digit zero. The pulses on OH(-) must be asymmetrical, active for thirty-one milliseconds, inactive for sixty-nine milliseconds. An inter-digit delay of at least one hundred milliseconds is required. 3 Tip 4 5, 6 7 8, 9 N/C L1 & L2 N/C DC1 & DC2 10 11 12 GND VCC OH(-) XECOM (2) XEV90 Pin Descriptions PIN 13 14 NAME DESCRIPTION Mute T2 The Mute signal ca...

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