TYPICAL PERFORMANCE CURVES
At Output of Pulse Transformer
Typical at 25°C, AVDD = +5V, and DVDD = +3.3V, unless otherwise specified.
AVERAGE POWER SPECTRAL DENSITY LIMIT
–20
LOWER
LIMIT
BREAK
FREQUENCY
UPPER
LIMIT
T1
SPEED
SLOPE
–80dB/decade
–40
T1
T1, Two Pair
E1, Two Pair
–38dBm/Hz
–40dBm/Hz
E1, Single Pair (E1-SP) –42.5dBm/Hz
196kHz
292kHz
485kHz
–80dB/decade –118dBm/Hz
–80dB/decade –120dBm/Hz
–80dB/decade –122dBm/Hz
E1
–60
–80
E1
E1-SP
E1-SP
–100
–120
–140
1k
10k
100k
1M
10M
100M
Frequency (Hz)
CURVE 1. Upper Bound of Power Spectral Density Measured at the Transformer Output.
0.4T 0.4T
TWO PAIR T1 AND E1
SINGLE PAIR E1
NORMALIZED
LEVELS
NORMALIZED
LEVELS
LIMITS
QUATENARY SYMBOLS (V)
QUATENARY SYMBOLS (V)
+3
0.0264
2.8248
2.6400
2.4552
0.0792
0.0264 –0.0088
–0.4224 –0.1408
–0.1320 –0.0440
+1
–1
–3
+3
0.0250
2.6750
2.5000
2.3250
0.1000
–0.0250 –0.0083
–0.5000 –0.1667
–1.2500 –0.0417
+1
–1
–3
0.0250
A
B
C
D
E
F
0.01
1.07
1.00
0.93
0.03
–0.01
–0.16
–0.05
0.0088 –0.0088 –0.0264
0.9416 –0.9416 –2.8248
0.8800 –0.8800 –2.6400
0.8184 –0.8184 –2.4552
0.0264 –0.0264 –0.0792
0.01
1.07
1.00
0.93
0.04
–0.01
–0.20
–0.05
0.0083 –0.0083
0.8917 –0.8917 –2.6750
0.8333 –0.8333 –2.5000
0.7750 –0.7750 –2.3250
0.0333 –0.0333 –0.1000
0.0088
0.1408
0.0440
0.0264
0.4224
0.1320
0.0083
0.1667
0.0417
0.0250
0.5000
0.1250
G
H
1.25T
–1.2T
–0.6T 0.5T
14T
50T
CURVE 2. Transmitted Pulse Template and Actual Performance as Measured at the Transformer Output.
INPUT IMPEDANCE vs BIT RATE
100
Two Pair T1 = 784kbps, 45kΩ
Two Pair E1 = 1168kbps, 30kΩ
Single Pair E1 = 2320kbps, 15kΩ
75
50
25
0
T1
E1
E1,
Single Pair
200
600
1000
1400
1800
2200
2600
Bit Rate (kbps)
CURVE 3. Input Impedance of rxLINE and rxHYB.
®
5
AFE1205