AK2548 Datasheet, PDF (11/30 Pages) Asahi Kasei Microsystems – 7 channel E1 Transceiver

ASAHI KASEI
[AK2548]
TRANSMITTER
Transmitter 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
Parameter
Symbol Min Typ Max Units
Condition
Output Pulse Shape
G.703
Output Pulse Amplitude 75Ω
120Ω
Pulse Amplitude for a _75Ω
space
120Ω
Output Pulse Imbalance amplitudes
widths
2.14 2.37
2.7 3.0
-0.237
-0.3
-4
-4
2.60
3.3
0. 237
0.3
4
4
V0p Note 1
V0p
V0p Note 1
V0p
%
%
Output Jitter
20Hz-100kHz
0.05 UIpp
Return Loss
51kHz-102kHz
9
dB
102kHz-2.048MHz
15
dB
2.048MHz-3.072MHz
11
dB
Note1: Turns Ratio, DCR and external resistors are recommended value. (P27)
Pulse Mask Template (G.703)
V = 100%
269 ns
(244 + 25)
194 ns
(244 – 50)
Nominal pulse
50%
0%
244 ns
219 ns
(244 – 25)
488 ns
(244 + 244)
Note – V corresponds to the nominal peak value.
Mask of the pulse at the 2048 kbit/s interface
C0028-E-00
11
1999/9