ML5825

ADVANCED DATASHEET

SEPTEMBER 2007

EDS-106038 REV A01

8

13

QPO

O (analog)

Charge Pump Output. This output is connected to the external PLL loop

filter. Sources current when the LO frequency is lower than desired.

12

14

VSSPLL

VREG1

13

QPO

9.2

Ω

16

VTUNE

I (analog)

VCO Tuning Voltage. This input from the PLL loop filter determines the

output frequency and is very sensitive to noise coupling and leakage

currents.

19

15

VSSLO

VREG3

16

VTUNE

17

VREG2

10

Ω

22

TXISET

I (analog)

A resistor between this pin and ground establishes the PA output power

compression point by setting a bias current.

7

2

VSSMX

VCCA

22

TXISET

24

VTXB

522

Ω

8

FREF

I (analog)

Input Reference Frequency. Depending on the state of the REFSEL pin

this input is divided by 3 or 4 to generate the PLL reference frequency.

7

2

VSSMX

VCCA

8

FREF

12

14

VSSPLL

VREG1

9

REFSEL

I (CMOS)

Reference Divider Control. If REFSEL is HIGH, FREF is divided by 4,

otherwise FREF is divided by 3. This is a CMOS input, and the

thresholds are referenced to VCCA and VSSMX.

7

2

VSSMX

VCCA

9

168

Ω

REFSEL