Functional Description

02044-DSH-002-A

Mindspeed Technologies™

9

Mindspeed Proprietary and Confidential

3.3.2

DC Offset Compensation

The M02044 contain an internal DC autozero circuit that can remove the effect of DC offsets without using external

components. This circuit is configured such that the feedback is effective only at frequencies well below the lowest

frequency of interest. The low frequency cut off is typically 25 kHz.

3.3.3

Data Outputs

The M02044 features PECL outputs as shown in Figure 3-3. The outputs may be terminated using any standard

AC or DC-coupling PECL termination technique. AC-coupling can be used for compatibility with non-PECL

interfaces.

3.3.4

Signal Detect (ST) and Loss of Signal (LOS)

indicated on the both the Signal Detect (ST) and LOS output pins. Figure 3-4 shows the ST and LOS output

structure.

The ST (LOS) signal is active (not asserted) when the signal is above the threshold value. The signal detection

circuitry has the equivalent of 3.5 dB (typical) electrical hysteresis.

Figure 3-3.

PECL Data Outputs

50

Ω

50

Ω

PECLP

PECLN