Analog Devices ADMV4530IF-EVALZ, Руководство пользователя

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UG-1759 ADMV4530IQ-EVALZ / ADMV4530IF-EVALZ Evaluation Board User Guide
Rev. A | Page 8 of 21
Label Function
B Use the Frequency & N Parameters section to change settings for the LO frequency after applying the initial settings in the
Initial Configuration (Label A) section. This section includes the following:
Requested LO Frequency and VCO Frequency : enter values in these two text boxes to trigger the INT, FRAC1, FRAC2, and
MOD2 calculations.
INT , FRAC1 , FRAC2 , and MOD2 : calculations based on the requested LO or VCO frequency. Changing these values directly
changes the actual LO and VCO frequency accordingly but does not change the requested LO and VCO frequency text boxes.
PFD Frequency : calculation based on the Reference Path (Label C) section.
Actual LO Frequency and VCO Frequency : the actual LO frequency and the actual VCO frequency are calculated from the PFD
frequency, INT, FRAC1, FRAC2, MOD1, and MOD2 parameters shown on the right side of the equation (see Figure 9).
Delta LO Frequency and VCO Frequency : the delta is computed from the difference between the requested and actual
frequencies, which is useful for detecting if there is any residual frequency error due to limitations caused by synthesizer resolution.
Lock Detect Readback : click the check button next to this option to check whether the PLL is locked.
Integer and Fractional indication light: indicates if the chip is in integer or fractional mode.
C
Use the Reference Path section to change the reference parameters and PFD frequency after applying the initial settings in the
Initial Configuration (Label A) section. This section includes the following:
PFD Frequency : the calculated PFD frequency based on the equation on right (see Figure 9).
REF Frequency : enter the reference input frequency.
Doubler : click this button to enable or disable the doubler.
R Word : scroll up and down to change the R word values, ranging from 1 to 32.
Div-by-2 : click this button to enable or disable the reference divide by 2 function.
D Click the Read button in the Core & Band section to read back the chip core and band values.
E Click the Read button in the Temp ADC section to read back the chip temperature sensor values.
F I and Q : scroll up and down to adjust the I and Q phase value in the LO Phase section.
G Use the Power Downs section to configure the different blocks power conditions in the chip. This section includes the following:
RF BIAS PD , PLL PD , and VCO PD : scroll up and down to power up or power down these blocks in the chip.
PD pin : scroll up and down to select normal operation or to power down the chip.
RESET_N Pin : scroll up and down to select normal operation or to reset the power-on state.
H Use the Mode Selection section to select the mixer mode and configure the automatic gain control (AGC).
I Use the Baseband Settings section to configure the dc settings for both IF and I/Q mode and the mixer common-mode
settings. This section includes the following:
DC Offset Target : scroll up and down to set the target dc offset. Changing the values result in changes in DC Offset I and DC
Offset Q values accordingly.
DC Offset I, DC Offset Q : bidirectional calculation associated with DC Offset Target . Scroll up and down to change these
values. The DC Offset Target changes accordingly.
MIXER_VCM : scroll up and down to change the mixer common-mode voltage. The hexadecimal value is shown to the right.
IQ Mode
: scroll up and down to change the I/Q mode common-mode voltage (
VCM
).
Calc Error light: this light illuminates if there is a calculation error when MIXER_VCM is changed to a value outside of the
nominal equations. Refer to the ADMV4530 data sheet and Register 0x103 for more details.
J The Other PLL Settings section consists of the following:
ΣΔ PD : click the dropdown menu to power down or power up the Σ-Δ function. For integer mode, power ΣΔ PD down. For
fractional mode, power ΣΔ PD up.
Aux ΣΔ : click the dropdown menu to enable or disable this function.
AUTOCAL : click the dropdown menu to enable or disable the auto calibration function.
Prescaler : click the dropdown menu to select the prescaler.
PD Polarity : click the dropdown menu to select the PD polarity.
CP Current : click the dropdown menu to select the charge pump current.
CP Bleed : click the dropdown menu to enable or disable the charge pump bleed.
MUXOUT : click the dropdown menu to configure the MUXOUT signal, which can output to the SDO pin.