Am79D2251

13

LINECARD PARTS LIST

The following list defines the parts and part values required to meet target specification limits for

channel i of the linecard (i = 1, 2)

Notes:

1. Value can be adjusted to suit application.

2. Can be looser for relaxed ring-trip requirements. 1% match (each resistor ±1%) gives 1.275 mA uncertainty in ringing current

sensing.

3. Required for metering > 2.5 Vrms, otherwise may be omitted.

4. DT2i is optional - Should be put if there is a chance that this chip may be replaced by Am79R251.

Item

Type

Value

Tol.

Rating

Comments

U1

Am79R241

ISLIC device

U2

Am79X22xx

ISLAC device

U3, U4

P1001SC

100 V

TECCOR Battrax protector

U5

TISP61089

80 V

Transient Voltage Suppresser, Power

Innovations

D1, D2

Diode

1 A

100 V

Diode

100 mA

100 V

50 ns

RFAi, RFBi

Resistor

50

Ω

2%

2 W

Fusible PTC protection resistors

RSAi, RSBi

Resistor

200 k

Ω

2%

1/4 W

Sense resistors

RTi

Resistor

80.6 k

Ω

1%

1/8 W

RRXi

Resistor

100 k

Ω

1%

1/8 W

RREF

Resistor

69.8 k

Ω

1%

1/8 W

Current reference

RMGLi, RMGPi

Resistor

1 k

Ω

5%

1 W

Thermal management resistors

RSHB, RSLB

Resistor

750 k

Ω

1%

1/8 W

RHLai

Resistor

40.2 k

Ω

1%

1/10 W

RHLbi

Resistor

4.32 k

Ω

1%

1/10 W

RHLci

Resistor

2.87 k

Ω

1%

1/10 W

RHLdi

Resistor

2.87 k

Ω

1%

1/10 W

CHLbi

Capacitor

3.3 nF

10 %

10 V

Not Polarized

CHLdi

Capacitor

0.82

µF

10 %

10 V

Ceramic

RMTi

Resistor

3.01 k

Ω

1%

1/8 W

RLGi

Resistor

6.04 k

Ω

1%

1/8 W

RTESTMi

Resistor

2 k

Ω

1%

1 W

Metallic test

RTESTLi

Resistor

2 k

Ω

1%

1 W

Longitudinal test

Capacitor

22 nF

10%

100 V

Ceramic, not voltage sensitive

CBATHi, CBATLi

Capacitor

100 nF

20%

100 V

Ceramic

CHPi

Capacitor

22 nF

20%

100 V

Ceramic

Capacitor

100 nF

20%

100 V

Protector speed up capacitor

Capacitor

56 pF

5%

100 V

Ceramic

Components for External Ringing

RGFDi

Resistor

510

Ω

2%

2 W

1.2 W typ

RSRBi, RSRc

Resistor

750 k

Ω

2%

1/4 W

Matched to within 0.2% for initial tolerance

and 0 to 70

17 mW typ

KRi

Relay

5 V Coil

DPDT