Texas Instruments DAC34SH84EVM - DAC34SH84 Evaluation Module DAC34SH84EVM DAC34SH84EVM 데이터 시트

제품 코드

DAC34SH84EVM

Software Control

2.2.1.3

PLL Settings

Figure 3. PLL Configuration

Follow the steps below to configure the PLL.

1. Enable PLL

2. Uncheck PLL reset and PLL sleep

3. Set M and N ratio such that F

DAC

= (M)/(N) x Fref

4. For the DAC3482, DAC3484, and DAC34H84: Set the prescaler such that the F

DAC

x prescaler is within

3.3GHz and 4GHz.

5. For the DAC34SH84, Set the prescaler such that the F

DAC

x prescaler is within 2.7GHz and 3.3GHz.

6. Set VCO Bias Tune to “1”

7. Charge Pump setting

(a) If stability (P x M) is less than 120, then set to “Single”.

(b) If stability (P x M) is greater than 120, then set to “Double” or install external loop filter

8. Adjust the Freq. Tune (coarse tune) accordingly. For additional information, see the relevant DAC348x

data sheet.

DAC348x EVM

SLAU432 – February 2012