AM7945JC datasheet(7/18 Pages) AMD

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ELECTRICAL CHARACTERISTICS (continued)

Description

Test Conditions (See Note 1)

Min

Typ

Max

Unit

Note

Idle Channel Noise (2-Wire and 4-Wire)

C-message weighted

2-wire,

°C to +70°C

–40

°C to +85°C

+10

+12

dBrnc

4-wire,

°C to +70°C

–40

°C to +85°C

+10

+12

Psophometric weighted

2-wire,

°C to +70°C

–40

°C to +85°C

–83

–78

dBmp

4-wire,

°C to +70°C

–40

°C to +85°C

–83

–75

Line Characteristics, Active State (See Figure 1)

Short loops, Active state

BAT = –48 V, RLDC = 600 Ω

24.7

29.3

Long loops, Active state

BAT = –48 V, RLDC = 1.9 kΩ

17.5

OHT state

BAT = –48 V, RLDC = 600 Ω

15.5

20.5

Standby state

TA = 25°C

0.7IL

1.3IL

RL = 600 Ω, BAT = –48 V

TA = 70°C

15.0

17.4

Loop current

Tip Open state, RL = 0 Ω

100

µA

Disconnect state, RL = 0 Ω

100

Tip Open state, Bwire to GND

Tip Open state, Bwire = BAT + 6 V

ILLIM (ITIP + IRING)

Tip and ring shorted to GND

100

130

Ground-start signaling (tip voltage)

Active state, RTIP to –48 V = 7.0 kΩ

RRING to GND = 100 kΩ

–7.5

–5.0

Open circuit voltage

Active and OHT state, BAT = –48 V

40.5

42.0

Power Dissipation, BAT = –48 V

On hook, Open Circuit state

100

On hook, OHT state

120

210

On hook, Active state

RTMG = Open

RTMG = 1700 Ω

160

195

230

280

On hook, Standby state

100

Off hook, OHT state

RL = 300 Ω, RTMG = ∞, BAT = –48 V

735

1100

Off hook, Active state

RL = 300 Ω, RTMG = ∞, BAT = –48 V

RL = 300 Ω, RTMG = ∞

1.25

0.57

1.60

0.85

Off hook, Standby state

RL = 600 Ω, TA = 25°C

0.68

1.0

BAT

3 V

–

1800

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