2-59

Preliminary Information

MH88510/11

AC and DC Loop Electrical Characteristics*

‡ Typical figures are at 25

°C with nominal + 5V supplies and are for design aid only.

x The SLIC can be loaded with an AC impedance as low as 2200

Ω without generating a false SHK output. Since each REN represents 8kΩ,

the SLIC can drive a REN of 3.6 without generating a false SHK output.

y See section on Tip-Ring Drive Circuit for driving longer lines.

AC Electrical Characteristics

‡ Typical figures are at 25

°C with nominal + 5V supplies and are for design aid only.

Characteristics

Sym

Min

Max

Units

Test Conditions

1

Maximum AC Ringing

Current Rejection x

44

mA

2

Ring Trip Detect Time

125

ms

3

Operating Loop Current

18

18

23

23

28

28

mA

mA

4

Maximum Operating Loop

Resistance y

2000

600

Ω

Ω

5

Loop Current at

Off-Hook Detect Threshold

8

9

10

11

12

13

µA

µA

Characteristics

Sym

Min

Max

Units

Test Conditions

1

Return Loss at 2-Wire

20

30

dB

Reference 600

Ω

@ 1kHz

2

Impedance at Junctor

604

Ω

3

Longitudinal to Metallic Balance

50

60

dB

40Hz - 4kHz

4

Longitudinal to Junctor Balance

50

60

dB

40Hz - 4kHz

5

Signal Output Overload Level

at 2-Wire

at Junctor

3.5

3.5

dBm

dBm

% THD < 5%

Reference: 600

Ω

Reference: 754

Ω

6

Total Harmonic Distortion

at 2-Wire

at Junctor

THD

1.0

1.0

%

%

Input 0.5V 1kHz

7

Idle Channel Noise

at 2-Wire

at Junctor

Nc

12

12

dBrnc

dBrnc

Reference: 600

Ω

Reference: 754

Ω

8

Power Supply Rejection Ratio at

2-Wire and Junctor

PSRR

25

25

25

dB

dB

dB

Ripple 0.1V 1kHz

9

Mute Attenuation

30

dB

Input 0.5V MUTE

= 0.0V @1kHz