31

4872A–CORD–08/05

U4091BM-R

Distortion at low

operating current

I

ENMIC = ETX = I101 = 0

dR

5

%

Adjustment step: earpiece amplifier

DEA[0:4] = 1

for EA[0:4] = 2 to 31

0.8

1

1.2

dB

Adjustment step: AGARX

DAGARX[0:2] = 1

0.8

1

1.2

dB

Gain for DTMF signal

AMPB

→ RECO1/2

EA[0:4] = 1

–10

dB

AC impedance

IMPH = 0

IMPH = 1

Z

impl

595

980

625

1030

655

1080

Ω

Ω

DTMF level at line (mid gain)

Sum level, 600

Ω,

DTMFM[0:2] = 4

–5.1

–3.6

–2.1

dBm

DTMF level at line (low gain)

Sum level, 600

Ω,

DTMFM[0:2] = 5

–7.6

–6.1

–4.6

dBm

DTMF level at line (high gain)

Sum level, 600

Ω,

DTMFM[0:2] = 6

AGATX[0:2] = 1

–5.2

–3.7

–2.2

dBm

Pre-emphasis

600 W, DTMFF4 = 0

DTMFF4 = 1

2

3

2.5

3.5

3

4

dBm

dBm

Speaker Amplifier, Differential Mode

AMPB

→ SAO1/2

ENSACL = ENSA = ENSAO = ENAM = I4O2 = 1, SA[0:4] = 31,

ERX = ETX = ENMIC = ENSTBAL = I1O1 = I3O3 = 1

Minimum line current for operation

ENAM = I4O2 = 0

SE = 0, I3O2 = 1

IMP 1 mA, V

11

mA

Gain from AMPB to SAO

V

SA[0:4] = 31

SA[0:4] = 0

36

37

–5.5

38

dB

Adjustment step speaker amplifier

DSA[0:4] = –1

1.15

1.35

1.55

dB

Output power single ended

Load resistance:

R

I

P

SA

3

7

20

mW

mW

Maximum output power differential

Load resistance:

V

P

SA

150

mW

Output noise

(input AMPB open)

psophometrically weighted

n

SA

240

mV

psoph

Gain deviation

I

T

∆G

SA

±1

dB

18. Electrical Characteristics (Continued)

RLS = 50

Ω, Z

Parameters

Test Conditions

Symbol

Min.

Typ.

Max.

Unit

Note:

1. This is a period of time the bus requires from the end of a data transmission and before a new transmission can be started