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參數(shù)資料
| 型號： | AG1171 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | +3.3V / +5.0V Low Power Ringing SLIC |
| 中文描述： | 3.3 / 5.0V低功耗振鈴用戶接口 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | AG1171 |
V1.0 Dec 2006
Data Sheet
Ag1171
+3.3V / +5.0V Low Power Ringing SLIC
5.5. The 2-4 Wire (hybrid) Conversion
The Ag1171 SLIC transmits and receives balanced 2 wire analog signals at the Tip and
Ring connections. These are converted to a ground referenced output at VOUT and from a
ground referenced input at VIN.
The VOUT and VIN pins are normally connected to a Codec or telephony DSP for
conversion of audio to and from a digital format.
5.6. Transmit and Receive Gain
The gain in both the transmit direction (Tip/Ring to VOUT) and the receive direction (VIN to
Tip/Ring) is set to 0dB. Normally any gain adjustments required by the user can be made
by programming the Codec or telephony DSP.
5.7. The 2 Wire Impedance
The 2 Wire impedance at Tip/Ring of the Ag1171 is set to 600R. It requires no external
programming resistors.
5.8. Network Balance Impedance
The network balance impedance ZB of the Ag1171 is set to 600R and it requires no
external programming resistors.
5.9. Tip & Ring Polarity Reversal
The Ag1171 can reverse the battery voltage polarity at Tip and Ring via the F/R pin.
If F/R is held at logic (H) (Forward) the d.c. voltage at Ring is negative with respect to Tip.
If F/R is taken to logic (L) (Reverse) the voltage at Ring is positive with respect to Tip.
5.10. On Hook Transmission
The Ag1171 is capable of on-hook transmission if an external resistor is fitted between
pins 1 (Ring) and 2 (Tip).
This means analog signals can be transmitted from VIN through Tip and Ring and onto the
line even when no external loop current is flowing. This can be used when sending Caller
Line Identification (CLI) information or for other “no ring” calls.
The Ag1171 will provide on hook transmission of audio signals up to 0dBm (0.775V) with a
high impedance on Tip/Ring or with AC loads down to 600R. To achieve this the external
bias resistor should have a value of 20Kohms. This will increase the VPWR idle current by
35ma. A larger value of resistor will reduce the idle current but the maximum audio signal
which can be transmitted will be reduced in proportion e.g. a 39Kohm bias resistor will
allow audio signals up to –6dBm (0.387V) with an increase in idle current of 18mA.
Silver Telecom 2006
8
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