AK2548 Datasheet, PDF (10/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
[AK2548]
RECEIVER
Receiver characteristics are guaranteed on the conditions as shown below.
VDD=3.3V±5%, VSS, GND=0V,Ta=-40~85ºC,
MCLK frequency: 2.048MHz±100ppm, 32.768MHz±100ppm.
Bipolar input frequency:2.048MHz±50ppm(reference input level: 2.37V0p±10%@75Ωsystem,
3V0p±10%@120Ωsystem)
Parameter
Symbol Min Typ Max Units
Condition
Input Impedance
Sensitivity
5
kΩ
-6
dB Note1
Loss of Signal Threshold
75Ω
120Ω
Allowable Consecutive Zeros before LOS
0.28 0.4 0.55 V Note2
0.35 0.5 0.7
V
170 175 180 bits
S/X tolerance
12 dB Note3
Generated Jitter
16
nspp Note4
Low pulse density immunity
Jitter Tolerance
1/16
ITU-T G.823
Mark
Note1: Relative value to the reference level. Compare at 1.024MHz with All mark pattern.
Note2: Level at the line side of transformer. Loss of signal is logical OR between an analog loss of signal
monitors input level and a digital loss of signal check recovered data stream.
Note3: PN15 and AMI 1/4 Mark pattern input. Noise frequency is 1MHz.
Note4: PN15 pattern input.
Jitter Tolerance(G.823)
36.9
1.5
0.2
1.2×10^-5Hz
C0028-E-00
20Hz
Jitter Frequency
2.4kHz 18kHz 100kHz
10
1999/9