L7585F datasheet(11/22 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.

11

Data Sheet

September 2001

L7585F Full-Feature, Low-Power SLIC and Switch

Electrical Characteristics (continued)

Table 6. Battery Feed Characteristics

1.

The longitudinal current is independent of dc loop current.

2.

Current limit, ILIM, is programmed by a resistor, RPROG, from pin IPROG to pin DCOUT. RPROG = 1.667 x (ILIM – 4); RPROG in k

Ω and ILIM

in mA. The current limit versus loop voltage has a slope of 10 k

Ω. The low current mode current limit is approximately 0.66 times the high

current limit. The ground start ring lead ground current limit is approximately equal to the high current limit and has a slope of about 5 k

Ω.

3.

In transmission applications, for compliance with TR-57, ground start ring lead I-V characteristics at high battery, it is expected that the

high-current active current limit will be set to 28 mA.

4.

Loop closure detector current, ILCD, is programmed by a resistor, RLCTH, from pin LCTH to pin DCOUT. RLCTH = 2.5 x ILCD; RLCTH in

k

Ω and ILCD in mA. ILCD is the tip to ring (forward battery) or ring to tip (reverse battery) current at which the loop closure detector indi-

cates an off-hook.

5.

dc feed resistance may be adjusted between 180

Ω and 600 Ω using a resistor divider between DCOUT and DCR. The open loop differen-

tial voltage may also be increased by applying a negative voltage to pin DCR. See dc Gains, pin DCR.

6.

DCOUT gain depends on the resistor RGX1 from pin VITR to pin ITR. This gain assumes 8250

Ω, the recommended value. Positive current

is defined as the differential current flowing from PT to PR.

7.

Positive voltage on pin DCR has no effect on the PT/PR voltage.

8.

At tip and ring, assuming 82.5

Ω protection resistors.

9.

At tip and ring with matched 82.5

Ω protection resistors when feedback is connected for either 600 Ω or 900 Ω termination impedance.

Parameter

Symbol

Min

Typ

Max

Unit

Tip or Ring Drive Current =

dc + Longitudinal + Signal Currents

—65

—

mA

ac Signal Current

—

10

—

mArms

Longitudinal Current Capability per Wire1

—8.5

15

—

mArms

dc Loop Current Limit2 (RLOOP = 100

Ω):

ILIM

Programmability Range

5

—

45

mA

Current Limit with VBAT = –51.5 V

and RPROG = 64.9 k

Ω

44

42

56

mA

Low-current Mode2 (RLOOP = 100

Ω,

VBAT = –51.5 V, and RPROG = 64.9 k

Ω)

25

27.5

30

mA

Ground Start Ring Grounded (RLOOP = 100

Ω)

Current Limit3:

VBAT = –51.5 V, RPROG = 64.9 k

Ω

38

43

47

mA

Loop Closure Current Detector Threshold4

Programming Accuracy

ILCD

——

±7

%

Open Loop Voltages (DCR = 0 V):

Common-mode Voltage

Differential Voltage

—

|VBAT + 7.0|

(VBAT + 1.8)/2

|VBAT + 6.5|

—

|VBAT + 6.0|

V

Disconnect State PT/PR Voltage

|PT-PR|

—

±100

mV

Ground Start Ring Lead Open or Shorted to Ground:

PT and CF1 Voltage

—

–1.7

–2.0

–2.3

V

dc Feed Resistance:

DCR Grounded

DCR Connected to DCOUT5

—

130

480

150

505

170

630

Ω

dc Gains:

PT/PR Current to DCOUT Voltage6:

Forward Battery

Reverse Battery

DCR Voltage7 to PT/PR Differential Voltage

—

–118

118

3.13

—

3.33

–132

132

3.53

V/A

—

Loop Resistance Range8

(3.17 dBm overload into 600

Ω):

ILOOP = 20 mA at VBAT = –51.5 V

—

1890

1930

—

Ω

Longitudinal to Metallic Balance—

IEEE® Std. 455:

50 Hz to 1 kHz

1 kHz to 3 kHz

—

589

48

70

66

—

dB

Metallic to Longitudinal (harm) Balance:

200 Hz to 4 kHz

—

35

—

dB

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