L7585F datasheet(9/22 Pages) AGERE

Il numero della parte	L7585F

Spiegazioni elettronici	Full-Feature,Low-Power SLIC and Switch

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Produttore elettronici	AGERE [Agere Systems]

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Agere Communications Inc.

9

Data Sheet

September 2001

L7585F Full-Feature, Low-Power SLIC and Switch

Operating States (continued)

Ground Start/Tip Amplifier State

s

Current limiting is achieved by reducing ring lead

voltage only. This state is the same as Ground Start/

Tip Open, but with SW2 and SW2A closed and the

tip amplifier powered up.

s

Ring lead current limit is approximately the difference

of the high-current active state limit and the current

flowing out of the tip lead.

s

On-hook transmission not to exceed –3 dBm with up

to 5 mA flowing out of the tip lead (maximum current

flow into the tip lead is permissible). Larger signal

and/or current may cause distortion.

s

NDET indicates an off-hook when the current flowing

out of the tip plus the current flowing into the ring is

twice the value programmed for the switchhook

detector.

Reverse Battery Ring Open State

s

Tip lead continuity test state (tone injected at the

receive port) in reverse battery.

s

Same as reverse battery active state, but with SW4

and SW4a open, and the ring drive amplifier

powered down.

s

Pin PR is high impedance (>100 k

Ω).

s

Tip current limit is twice the low-current active state

current limit.

s

NDET indicates an off-hook when the tip current

(flowing into PT) is twice the value programmed for

the switchhook detector in the reverse battery active

state.

Reverse Battery Low-Current Active State

s

Normal talk and reverse battery feed state.

s

Same as forward battery active state, but PR is posi-

tive with respect to PT.

s

Current limit is lowered to approximately 0.66 times

the normal limit.

Absolute Maximum Ratings (TA = 25 °C)

Stresses exceeding the values listed under absolute

maximum ratings may cause permanent damage to the

device. This is an absolute stress rating only. Func-

tional operation of the device at these or any other con-

ditions in excess of those indicated in the operational

sections of this data sheet is not implied. Exposure to

absolute maximum rating conditions for extended peri-

ods of time may adversely affect device reliability.

Note:

Analog voltages are referenced to AGND, digital (logic) volt-

ages are referenced to DGND, and battery voltages are ref-

erenced to BGND. The IC can be damaged unless all

ground connections are applied before and are removed

after all other connections. Furthermore, when powering the

device, the user must guarantee that no external potential

creates a voltage on any pin of the device that exceeds the

device ratings. Some of the known examples of conditions

that cause such potentials during powering are the following:

1) an inductor connected to tip and ring that can force an

overvoltage on VBAT through external components if the

VBAT connection chatters; and 2) inductance in the VBAT

lead that could resonate with the VBAT filter capacitor to

cause a destructive overvoltage.

Parameter

Value

Unit

+5 V dc Supplies (VCCA and

VCCD)

–0.5 to +7.0

V

+10 V dc Bias Supply (VSP)

–0.5 to +15

V

Office Battery Supply (VBAT)

–63 to +0.5

V

Logic Input Voltage

–0.5 to

VDDD + 0.5

V

Logic Input Clamp Diode Cur-

rent, per Pin

±20

mA

Logic Output Voltage

–0.5 to

VDDD + 0.5

V

Logic Output Current, per Pin

(excluding relay driver)

±35

mA

Operating Temperature Range

–40 to +125

°C

Storage Temperature Range

–40 to +125

°C

Relative Humidity Range

5 to 95

%RH

Ground Potential Difference

(BGND to AGND)

±3

V

Ground Potential Difference

(DGND to AGND)

±3

V

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