CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
2. Characterized with 2 x 10µs, and 10 x 1000µs first level lightning surge waveforms (GR-1089-CORE).
3. These parameters are controlled via design or process parameters and are not directly tested. These parameters are characterized upon initial
design release and upon design changes which would affect these characteristics.
Electrical Specifications
Unless Otherwise Specified, T
A
= -40°C to 85°C, V
BL
= -24V, V
BH
= -48V, V
CC
= +5V, AGND = BGND = 0V, loop
current limit = 25mA. All AC Parameters are specified at 600Ω 2-wire terminating impedance over the frequency
band of 300Hz to 3.4kHz. Protection resistors = 0Ω.
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
RINGING PARAMETERS
VRB Input Impedance (Note 3)
480
-
-
kΩ
AC TRANSMISSION PARAMETERS
(Forward Active and Reverse Active, BSEL = 0, unless otherwise specified.)
Receive Input Impedance (Note 3)
Transmit Output Impedance (Note 3)
4-Wire Port Overload Level
2-Wire Port Overload Level
2-Wire Return Loss
THD = 1%
THD = 1%
300Hz
≤
f
<
1kHz
1kHz
≤
f
≤
3.4kHz
Longitudinal Current Capability (Per Wire)
Test for False Detect
Test for False Detect, Low Power Standby, BSEL =
0
2-Wire Longitudinal Balance
4-Wire Longitudinal Balance
4-Wire to 2-Wire Insertion Loss
2-Wire to 4-Wire Insertion Loss
4-Wire to 4-Wire Insertion Loss
2-Wire to 4-Wire Level Linearity
4-Wire to 2-Wire Level Linearity
Referenced to -10dBm
Idle Channel Noise 2-Wire
+3 to -40dBm, 1kHz
-40 to -50dBm, 1kHz
-50 to -55dBm, 1kHz
C-Message
Psophometric
Tested per IEEE455-1985, with 368Ω per wire.
Tested per IEEE455-1985, with 368Ω per wire.
160
-
3.1
3.1
25
17
-
-
53
59
-0.2
-6.22
-6.32
-
-
-
-
-
-
-
3.5
3.5
32
22
20
10
-
-
0
-6.02
-6.02
±0.025
±0.050
±0.100
16
-74
-
1
-
-
-
-
-
-
-
-
+0.3
-5.82
-5.82
-
-
-
19
-71
kΩ
Ω
V
PK
V
PK
dB
dB
mA
RMS
mA
RMS
dB
dB
-
-
dB
dB
dB
dB
dBrnC
dBmp
3
FN4539.3
HC5549
Electrical Specifications
Unless Otherwise Specified, T
A
= -40°C to 85°C, V
BL
= -24V, V
BH
= -48V, V
CC
= +5V, AGND = BGND = 0V, loop
current limit = 25mA. All AC Parameters are specified at 600Ω 2-wire terminating impedance over the frequency
band of 300Hz to 3.4kHz. Protection resistors = 0Ω.
(Continued)
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
DC PARAMETERS
Loop Current Limit Programming Range
Loop Current Accuracy
Loop Current During Low Power Standby
Open Circuit Voltage
(|Tip - Ring|)
Low Power Standby Open Circuit Voltage (Tip - Ring)
Ring Trip Programming Current Accuracy
Ring Trip Comparator Threshold
Switch Hook Programming Range
Switch Hook Programming Accuracy
Dial Pulse Distortion
Ground Key Threshold
Thermal Alarm Output
RELAY DRIVER
On Voltage
LOGIC INPUTS (F0, F1, F2, E0, SWC)
Input Low Voltage
Input High Voltage
Input Low Current
Input High Current
LOGIC OUTPUTS (DET, ALM)
Output Low Voltage
Output High Voltage
I
OL
= 5mA
I
OH
= 100µA
V
IL
= 0.4V
V
IH
= 2.4V
I
L
= 45 mA
Max Low Battery = -52V, BSEL = 0
I
L
= 25mA, BSEL = 0
Forward polarity only.
BSEL = 0
BSEL = 1
BSEL = 1
15
-
17
14
37.5
43
-
2.3
5
-
-
-
-
-
-
15.5
40
45
-
2.6
-
-
1
12
175
45
± 10
26
17
42.5
47
± 10
2.9
15
10
-
-
-
mA
%
mA
V
V
V
%
V
mA
%
%
mA
°C
IC junction temperature
-
-
-
0.60
V
-
2.0
-20
-
-
-
-
-
0.8
-
-
5
V
V
µA
µA
-
2.4
-
-
0.4
-
V
V
SUPPLY CURRENTS
(Supply currents not listed are considered negligible and do not contribute significantly to total power dissipation. All
measurements made under open circuit load conditions.)
Low Power Standby
I
CC
I
BH
, BSEL = 1
Forward or Reverse (Note 5)
I
CC
I
BL
, BSEL = 0
Forward
I
CC
I
BL
, BSEL = 1
I
BH
, BSEL = 1
Power Denial
I
CC
I
BL
, BSEL = 1 or 0
Forward Lookback
I
LL
I
BL
, V
BL
= -24V
2.0
-
2.5
-
3.5
-
-
0.5
-
-
-
3.7
0.375
4.0
1.0
4.5
0.7
1.0
3.0
0.2
-
-
6.0
0.600
6.0
2.5
8.0
2.0
2.5
6.0
0.5
10.0
25.0
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
4
FN4539.3
HC5549
Electrical Specifications
Unless Otherwise Specified, T
A
= -40°C to 85°C, V
BL
= -24V, V
BH
= -48V, V
CC
= +5V, AGND = BGND = 0V, loop
current limit = 25mA. All AC Parameters are specified at 600Ω 2-wire terminating impedance over the frequency
band of 300Hz to 3.4kHz. Protection resistors = 0Ω.
(Continued)
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PARAMETER
ON HOOK POWER DISSIPATION
Forward or Reverse
Forward or Reverse
Low Power Standby
OFF HOOK POWER DISSIPATION
Forward or Reverse
POWER SUPPLY REJECTION RATIO
V
CC
to 2-Wire
f = 300Hz
f = 1kHz
f = 3.4kHz
V
CC
to 4-Wire
f = 300Hz
f = 1kHz
f = 3.4kHz
V
BL
to 2-Wire
V
BL
to 4-Wire
V
BH
to 2-Wire
V
BH
to 4-Wire
BSEL = 0
BSEL = 0
BSEL = 1
BSEL = 1
-
-
-
44
90
37
60
150
60
mW
mW
mW
-
290
310
mW
-
-
-
-
-
-
-
-
-
-
-
40
35
28
45
43
33
30
35
33
40
45
-
-
-
-
-
-
-
-
-
-
-
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
300Hz
≤
f
≤
3.4kHz
300Hz
≤
f
≤
3.4kHz
300Hz
≤
f
≤
3.4kHz
300Hz
≤
f
≤
1kHz
1kHz
<
f
≤
3.4kHz
Design Equations
Loop Supervision Thresholds
SWITCH HOOK DETECT
The switch hook detect threshold is set by a single external
resistor, R
SH
. Equation 1 is used to calculate the value of R
SH
.
R
SH
=
600
⁄
I
SH
(EQ. 1)
Loop Current Limit
The loop current limit of the device is programmed by the
external resistor R
IL
. The value of R
IL
can be calculated
using Equation 3.
1760
-
R
IL
= ------------
I
LIM
(EQ. 3)
The term I
SH
is the desired DC loop current threshold. The
loop current threshold programming range is from 5mA to
15mA.
GROUND KEY DETECT
The ground key detector senses a DC current imbalance
between the Tip and Ring terminals when the ring terminal is
connected to ground. The ground key detect threshold is not
externally programmable and is internally fixed to 12mA
regardless of the switch hook threshold.
RING TRIP DETECT
The ring trip detect threshold is set by a single external
resistor, R
RT
. I
RT
should be set between the peak ringing
current and the peak off hook current while still ringing.
R
RT
=
1800
⁄
I
RT
(EQ. 2)
The term I
LIM
is the desired loop current limit. The loop
current limit programming range is from 15mA to 45mA.
Impedance Matching
The impedance of the device is programmed with the
external component R
S
. R
S
is the gain setting resistor for
the feedback amplifier that provides impedance matching. If
complex impedance matching is required, then a complex
network can be substituted for R
S
.
RESISTIVE IMPEDANCE SYNTHESIS
The source impedance of the device, Z
O
, can be calculated
in Equation 4.
R
S
=
400
(
Z
O
)
(EQ. 4)
The required impedance is defined by the terminating
impedance and protection resistors as shown in Equation 5.
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