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5.4 - Transmit Path Specifications

TA = 0 to 70°C unless otherwise specified. The following specifications are guaranteed only when the

Digital Control Interface is not active.

Notes: a. This will represents the 0dBr for the other specifications in the present table. The level is mesured for the frequency of 30KHz

which will correspond to the reference frequency. Variations include process, temperature and power variations.

b. This gain is given relatively to the 0dBr previously defined. Variations include process, temperature and power variations.

c. Ratio between max peak amplitude of one of the 2 single tones to any spurious. Measure performed for a dual tone signal (each

tone with an amplitude equal to -6dBr), in range 30KHz to 1MHz (couple (f1,f2) are (70KHz, 80KHz), (120KHz, 130KHz)).

d. Ration between max peak amplitude of one of the 2 single tones to any spurious. Measure performed for a (250KHz, 260KHz) dual

tone signal (each tone with an amplitude equal to -6dBr), in range 30KHz to 1MHz.

Table 10 : Transmit Path Specifications

Typical specifications apply for VCC = 5.0V, temperature = 27°C, nominal process and bias current. Maximum and

Description

Min.

Typ.

Max.

Unit

Comments

Input word rate

8.832

MHz

Input word resolution

16

bits

PGAP/PGAN OUTPUT

Common mode voltage

2.4

2.5

2.6

V

Measured on each output

Load resistance

500

Ω

Single ended

Load capacitance

10

pF

Single ended

Output Impedance

1

5

Ω

Single ended

Reference Output signal

a

-5%

2.4

+5%

Vp

Differential output @0dB gain for TxPGA

Output noise

45

See also mask diagram below ("Final

PGAP/N noise mask")

Cutoff frequency

4

MHz

@-3dB

Gain,0

≤ D ≤ 15

b

step size 1dB

-D-0.5

-D

-D+0.5

dB

Programmable attenuator.

Step size

0.8

1

1.2

dB

TXP/TXN OUTPUT

Common mode voltage

2.4

2.5

2.6

V

Measured on each output

Load resistance

500

Ω

Single ended

Load capacitance

10

pF

Single ended

Output Impedance

1

5

Ω

Single ended

Output SDR

2 tones ADSL/POTS

c

2 tones ADSL/ISDN

d

79

71

dB

For TxPGA gain = 0dB

nV

Hz

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