LMX2433 datasheet(13/53 Pages) TI1

13 / 53 page

LMX2430, LMX2433, LMX2434

www.ti.com

SNAS187D – FEBRUARY 2003 – REVISED JANUARY 2016

Bench Test Setups (continued)

The measurements are typically taken over supply voltage and temperature. The measurements are also

typically taken at the HIGH and LOW charge-pump current gains. The charge-pump current gain can be

controlled by the RF_CPG bit in CodeLoader. Once the charge-pump currents are determined, the (i) charge-

pump output current magnitude variation versus charge-pump output voltage, (ii) charge-pump output sink

current versus charge-pump output source current mismatch, and (iii) charge-pump output current magnitude

versus temperature, can be calculated. Refer to the Charge Pump Current Specifications Definition for more

details.

8.1.2 Charge-Pump Current Specification Definitions

I1 = Charge-Pump Sink Current at VCPout = Vcc − ΔV

I2 = Charge-Pump Sink Current at VCPout = Vcc//2

I3 = Charge-Pump Sink Current at VCPout = ΔV

I4 = Charge-Pump Source Current at VCPout = Vcc − ΔV

I5 = Charge-Pump Source Current at VCPout = Vcc/2

I6 = Charge-Pump Source Current at VCPout = ΔV

ΔV = Voltage offset from the positive and negative rails. Dependent on the VCO tuning range relative to Vcc and

GND. Typical values are between 0.5V and 1.0V.

VCPout refers to either VCPoutRF or VCPoutIF

ICPout refers to either ICPoutRF or ICPoutIF

Figure 24. Charge-Pump Parameters

8.1.2.1 Charge-Pump Output Current Variation vs Charge-Pump Output Voltage

(1)

8.1.2.2 Charge-Pump Sink Current vs Charge-Pump Output Source Current Mismatch

(2)

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LMX2433 Datasheet(PDF) 13 Page - Texas Instruments