AM79489 データシートの表示（PDF） - Unspecified

部品番号

コンポーネント説明

メーカー

AM79489

Subscriber Line Interface Circuit

Unspecified 

RELAY DRIVER SCHEMATICS

RINGOUT

TESTOUT

BGND

BGND

Notes:

1. Unless otherwise specified, test conditions are VCC = +5 V, BAT1 = –50 V, BAT2 = –34 V, RL = 600 Ω, RDC1 = RDC2 = 5.833 kΩ,

RTMG = 570 Ω, RD = 35.4 kΩ, RFA = 0 Ω, no fuse resistors, CHP = 0.22 µF, CDC = 0.5 µF, CCAS = 0.33 µF, CVBAT12 = 220 nF,

D1 = D2 = 1N400x, OVH = 1, two-wire AC input impedance is a 600 Ω resistance synthesized by the programming network

shown below.

VTX

RT1 = 76 kΩ

RT2 = 76 kΩ

CT1 = 120 pF

RSN

RRX = 150 kΩ

VRX

2. a. Overload level exists when THD = 1%.

b. Overload level exists when THD = 1.5%.

3. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.

4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.

5. Tested with 0 Ω source impedance. 2 MΩ is specified for system design only.

6. Group delay can be greatly reduced by using a ZT network such as that shown in Note 1 above. The network reduces the

group delay to less than 2 µs and increases 2WRL. The effect of group delay on linecard performance also may be

compensated for by synthesizing complex impedance with the DSLAC™ or QSLAC™ device.

7. Minimum current level is guaranteed not to cause a false Loop Detect. The SLIC must be functional in this condition.

8. Four-wire performance is 5–9 dB better than the specified two-wire values.

9. Open loop, Active state, Metering mode power dissipation may be reduced from a typical of 550 mW to a typical of 150 mW

by connecting the DET pin to the OVH pin. This connection will force the SLIC into the nonmetering mode while on hook. With

this connection, a metering signal sent after the SLIC goes on hook may be distorted on the 2W line because the SLIC is

forced into the nonmetering mode. To eliminate this distortion, a delay can be added between the time the SLIC goes on hook

and the time the SLIC switches to nonmetering mode by using an RC circuit for the DET pin to OVH pin connection.

SLIC Products

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