Le7920
Data Sheet
ELECTRICAL CHARACTERISTICS
Description
Transmission Performance
2-wire return loss
Analog output (VTX) impedance
Analog (VTX) output offset voltage
Overload level, 2-wire and 4-wire
Overload level
Test Conditions (See Note 1)
Min
Typ
Max
Unit
Note
200 Hz to 3.4 kHz
26
dB
Ω
1, 4
4
3
20
+50
–50
2.5
0.77
mV
Vpk
Vrms
Active state
On hook, RLAC = 600 Ω
2a
2b
THD, Total Harmonic Distortion
0 dBm
+7 dBm
–64
–55
–50
–40
dB
5
THD, On hook
0 dBm, RLAC = 600 Ω
–36
Longitudinal Capability (See Test Circuit D)
Longitudinal to
metallic L-T, L-4
balance
200 Hz to 1 kHz
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
–1*
–2
–1
–2
52
63
50
58
4
4
dB
1 kHz to 3.4 kHz
0°C to +70°C
0°C to +70°C
–40°C to +85°C
–40°C to +85°C
–1*
–2
–1
–2
52
58
50
53
4
4
Longitudinal signal generation 4-L
Longitudinal current per pin (A or B)
Longitudinal impedance at A or B
Idle Channel Noise
200 Hz to 3.4 kHz
Active state
0 to 100 Hz
40
20
27
25
35
mArms
Ω/pin
8
C-message weighted noise
RL = 600 Ω
0°C to +70°C
7
+10
+12
–80
–78
dBrnc
dBmp
RL = 600 Ω
–40°C to +85°C
4
Psophometric weighted noise
RL = 600 Ω
RL = 600 Ω
0°C to +70°C
–40°C to +85°C
–83
Insertion Loss and Balance Return Signal (See Test Circuits A and B)
Gain accuracy
4- to 2-wire
Gain accuracy
2- to 4-wire, 4- to 4-wire
Gain accuracy, 4- to 2-wire
Gain accuracy, 2- to 4-wire, 4- to 4-wire On hook
Gain accuracy over frequency
0 dBm, 1 kHz
0 dBm, 1 kHz
On hook
–0.20
–6.22
0
+0.20
–5.82
–6.02
–0.35
–6.37
–0.15
+0.35
–5.67
+0.15
4
–6.02
dB
µs
300 to 3.4 kHz
relative to 1 kHz
Gain tracking
+3 dBm to –55 dBm
relative to 0 dBm
0 dBm to –37 dBm
+3 dBm to 0 dBm
–0.15
+0.15
Gain tracking
On hook
–0.15
–0.35
+0.15
+0.35
Group delay
0 dBm, 1 kHz
4
4, 7
Note:
* Performance Grade
8
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
