CS61884 datasheet(56/71 Pages) CIRRUS

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CS61884

DS485F1

19.5 Receiver Analog Characteristics

(TA = -40

°C to 85°C; TV+, RV+ = 3.3 V ±5%; GND = 0 V))

Notes: 11. Parameters guaranteed by design and characterization.

12. Using components on the CDB61884 evaluation board in Internal Match Impedance Mode.

13. Return loss = 20log10 ABS((Z1 + Z0) / (Z1 - Z0)) where Z1 - impedance of the transmitter or receiver,

and Z0 = cable impedance.

14. Assuming that jitter free clock is input to TCLK.

15. Jitter tolerance for 0 dB for T1/J1 input signal levels and 6 dB for E1 input signal levels. Jitter tolerance

increases at lower frequencies. HDB3/B8ZS coders enabled.

16. In Data Recovery Mode.

17. Jitter Attenuator in the receive path.

Parameter

Min.

Typ

Max

Units

Allowable Cable Attenuation @ 1024kHz and 772kHz

- 12

RTIP/RRING Input Impedance

T1/J1 100

Ω Load

(Internal Line matching mode)

E1 120

Ω Load

Note 11

E1 75

Ω Load

140

14k

Ω

RTIP/RRING Input Impedance

T1/J1 100

Ω Load

(External Line matching mode)

E1 120

Ω Load

Note 11

E1 75

Ω Load

14K

14k

14K

Ω

Receiver Dynamic Range

0.5

Signal to Noise margin (Per G.703, O151 @ 6dB cable Atten). Note 11

-- 18

Receiver Squelch Level

150

LOS Threshold

200

LOS Hysteresis

Data Decision Threshold

E1 Modes

Note 11

% of

peak

Data Decision Threshold

T1/J1 Modes

Note 11

% of

peak

Input Jitter Tolerance - E1

1 Hz - 1.8 Hz

Notes 11, 15, 17

20 Hz - 2.4 kHz

18 kHz - 100 kHz

1.5

0.2

Input Jitter Tolerance - T1/J1

0.1 Hz - 1 Hz

Notes 11, 15, 17

4.9Hz - 300kHz

10kHz - 100 kHz

138

0.4

Input Return Loss - E1/T1/J1

51 kHz - 102 kHz

102 kHz - 2048 kHz

Notes 11, 12, 13

2048 kHz - 3072 kHz

- 18

- 28

- 30

- 27

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