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LUCL7585FP

Full-Feature, Low-Power SLIC and Switch

Agere -> LSI Corporation 

Data Sheet

September 2001

L7585F Full-Feature, Low-Power SLIC and Switch

Electrical Characteristics (continued)

Table 6. Battery Feed Characteristics

Parameter

Tip or Ring Drive Current =

dc + Longitudinal + Signal Currents

ac Signal Current

Longitudinal Current Capability per Wire1

dc Loop Current Limit2 (RLOOP = 100 Ω):

Programmability Range

Current Limit with VBAT = –51.5 V

and RPROG = 64.9 kΩ

Low-current Mode2 (RLOOP = 100 Ω,

VBAT = –51.5 V, and RPROG = 64.9 kΩ)

Ground Start Ring Grounded (RLOOP = 100 Ω)

Current Limit3:

VBAT = –51.5 V, RPROG = 64.9 kΩ

Loop Closure Current Detector Threshold4

Programming Accuracy

Open Loop Voltages (DCR = 0 V):

Common-mode Voltage

Differential Voltage

Disconnect State PT/PR Voltage

Ground Start Ring Lead Open or Shorted to Ground:

PT and CF1 Voltage

dc Feed Resistance:

DCR Grounded

DCR Connected to DCOUT5

dc Gains:

PT/PR Current to DCOUT Voltage6:

Forward Battery

Reverse Battery

DCR Voltage7 to PT/PR Differential Voltage

Loop Resistance Range8

(3.17 dBm overload into 600 Ω):

ILOOP = 20 mA at VBAT = –51.5 V

Longitudinal to Metallic Balance—IEEE® Std. 455:

50 Hz to 1 kHz

1 kHz to 3 kHz

Metallic to Longitudinal (harm) Balance:

200 Hz to 4 kHz

Symbol

—

—

—

ILIM

ILCD

—

|PT-PR|

—

—

—

—

—

—

Min

Typ

Max

65

—

—

10

—

—

8.5

15

—

5

—

45

44

42

56

25

27.5

30

38

43

47

—

—

±7

—

(VBAT + 1.8)/2

—

|VBAT + 7.0| |VBAT + 6.5| |VBAT + 6.0|

—

—

±100

–1.7

–2.0

–2.3

130

150

170

480

505

630

–118

118

3.13

—

—

3.33

–132

132

3.53

1890

1930

—

58 9

70

—

48

66

—

35

—

—

Unit

mA

mArms

mArms

mA

mA

mA

mA

%

V

V

mV

V

Ω

Ω

V/A

V/A

—

Ω

dB

dB

dB

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 kΩ and ILIM

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

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

kΩ 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.

Agere Communications Inc.

11

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