8

Am7953X Data Sheet

ELECTRICAL CHARACTERISTICS (continued)

Description

Test Conditions (See Note 1)

Min

Typ

Max

Unit

Note

Power Dissipation BAT = –48 V, Normal Polarity

On-hook Open Circuit state

–1*

35

35

120

80

mW

On-hook OHT state

–1*

135

135

250

200

On-hook Active state

–1*

200

200

400

300

Off-hook OHT state

500

750

Off-hook Active state

650

1000

Supply Currents

Open Circuit state

OHT state

Active state

3.0

6.0

7.5

4.5

10.0

12.0

mA

Open Circuit state

OHT state

Active state

1.0

2.2

2.7

2.3

3.5

6.0

Open Circuit state

OHT state

Active state

0.4

3.0

4.0

1.0

5.0

6.0

50 Hz to 3.4 kHz

–1*

25

30

45

45

dB

6, 7

3.4 kHz to 50 kHz

–1

22

25

35

35

50 Hz to 3.4 kHz

–1*

20

25

40

40

3.4 kHz to 50 kHz

–1

10

10

25

25

50 Hz to 3.4 kHz

–1*

27

30

45

45

3.4 kHz to 50 kHz

–1

20

25

40

40

Off-Hook Detector

Current threshold accuracy

–20

+20

%

Ground-Key Detector Thresholds, Active State, BAT = –48 V (See Test Circuit F)

Ground-key resistance threshold

B(RING) to GND

2.0

5.0

10.0

k

Ω

Ground-key current threshold

B(RING) to GND

Midpoint to GND

9mA

8

Ring-Trip Detector Input

Bias current

–5

–0.05

µA

Offset voltage

Source resistance 0 to 2 M

Ω

–50

0

+50

mV

11