SLIC Products

11

Notes:

nent formulas.)

2. Overload level is defined when THD = 1%.

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

5. These tests are performed with a longitudinal impedance of 90

Ω and metallic impedance of 300 Ω for frequencies below

12 kHz and 135

Ω for frequencies greater than 12 kHz. These tests are extremely sensitive to circuit board layout.

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

7. When the SLIC is in the Anti-sat 2 operating region, this parameter is degraded. The exact degradation depends on system

design. The Anti-sat 2 region occurs at high loop resistances when

V

8. “Midpoint” is defined as the connection point between two 300

Ω series resistors connected between A(TIP) and B(RING).

9. Fundamental and harmonics from 256 kHz switch-regulator chopper are not included.

10. Total harmonic distortion with metering as specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit

signal of +3 dBm or receive signal of –4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion

is measured as the highest in-band harmonic at the two-wire or the four-wire output relative to the input signal.

11. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring

the psophometric noise at the two-wire and four-wire outputs over a 200 ms time interval.

12. Tested with 0

Ω source impedance. 2 MΩ is specified for system design purposes only.

the group delay to less than 2

µs. The effect of group delay on linecard performance may be compensated for by using the

QSLAC™ or DSLAC™ devices.

Note:

* A logic Low on E0 disables the DET output into the open-collector state.

Table 1.

SLIC Decoding

DET Output

State

C3 C2 C1

Two-Wire Status

E0 = 1*

E1 = 0

E0 = 1*

E1 = 1

0

0

0

0

Open Circuit

Ring trip

Ring trip

1

0

0

1

Ringing

Ring trip

Ring trip

2

0

1

0

Active

Loop detector

Ground key

3

0

1

1

On-hook TX (OHT)

Loop detector

Ground key

4

1

0

0

Tip Open

Loop detector

—

5

1

0

1

Reserved

Loop detector

—

6

1

1

0

Active Polarity Reversal

Loop detector

Ground key

7

1

1

1

OHT Polarity Reversal

Loop detector

Ground key

VTX

RSN

153 k

Ω

153 k

Ω

56 pF