ST70134A

11/22

Figure 6 : SC Filter Mask for TX

Linearity in TX

Linearity of the TX is defined by the IM3 product of two sinusoidal signals with frequencies f1 and f2 and

each with 0.5Vpd amplitude (total

≤ 1Vpd) at the output of the pre-driver for the case of a total

AGC = 0dB.

TX Idle Channel Noise

The idle channel noise specifications correspond with 11bit resolution of the complete TX-path. TX idle

channel output noise on TXP, TXN.

Power Supply Rejection

The noise on the power supplies for the TX-path must be lower than the following:

< 50mVrms in-band white noise for AVDD.

< 15mVrms in-band white noise for Pre-driver AVDD.

VCXO

A voltage controlled crystal oscillator driver is integrated in ST70134. The nominal frequency is

35.328MHz. The quartz crystal is connected between the pins XTALI and XTALO. The principle of the

VCXO control is shown in Figure 7.

Table 12 : D/A Converter (A current steering architecture is used)

Description

Value / Unit

Numbers of bits:

12bits

Minimum resolution of the D/A converters

11bits

Linearity error of the A/D converter

<1LSB (out of 12bits)

Full scale input range:

1 Vpdif ±5%

Sampling rate:

8.832MHz (or 4.416MHz in compatible mode)

Maximum group delay:

<3

µs

Maximum group delay distortion:

<1

µs

Table 13 : Linearity in TX

f1 (0.5Vpd)

80kHz

f2 (0.5Vpd)

70kHz

S/IM3 (AGC = 0 dB)

59.5dB (@ 60KHz, 90KHz)

Table 14 : TX idle channel noise

For max AGC setting (0dB)

In-band noise

Out-of-band noise

1.6

µVHz-1/2

150nVHz-1/2

@ 34.5kHz -138kHz

@ 250kHz -1.104MHz

For min AGC setting (=-15dB)

In-band noise

500nVHz-1/2

@ 34kHz -138kHz

Amplitude

0dB

±1dB

20dB

30

138 250

kHz