Linearity of ATU-R TX

Table 18. Linearity of ATU-R TX

f1 (0.5Vpd)

f2 (0.5Vpd)

S/IM3 (AGC = 0 dB)

80kHz

70kHz

59.5dB (@ 60KHz, 90KHz)

Table 19. ATU-C TX idle channel noise

For max AGC setting (0dB)

In-band noise

Out-of-band noise

500nVHz

-1/2

500nVHz

-1/2

@ 138kHz -1.104MHz

@ 34.5kHz -138kHz

For min AGC setting (=-15dB)

In-band noise

80nVHz

-1/2

@ 138kHz -1.104MHz

TX IDLE CHANNEL NOISE

ATU-C TX idle channel noise

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

TX idle channel output noise on TX.

ATU-R TX idle channel noise

ATU-R TX idle channel output noise on TXP, TXN

Table 20. ATU-R TX idle channel noise

For max AGC setting (0dB)

In-band noise

Out-of-band noise

1.6

1.6

150nVHz

-1/2

@ 34.5kHz -138kHz

@ 138kHz

@ 250kHz -1.104MHz

For min AGC setting (=-15dB)

In-band noise

500nVHz

-1/2

@ 34kHz -138kHz

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 STLC60134S. 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 11.

The information coming from the digital processor via the CTRLIN path is used to drive an 8-bit DAC

which generates a control current. This current is externally converted and filtered to generate the re-

quired control voltage (range:-15V to 0.5V) for the varicap. The VCXO circuit characteristics are given in

Table 21.

STLC60134S

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