±40

±35

±30

±25

±20

±15

±10

±5

0

0

2

4

6

8

10

12

14

16

Frequency (GHz)

C001

±5

±4

±3

±2

±1

0

1

2

3

4

5

0.0

0.3

0.6

0.9

1.2

1.5

1.8

2.1

2.4

2.7

3.0

3.3

Charge Pump Voltage (V)

Kpd = 8x

Kpd = 16x

Kpd = 31x

C001

±5

±4

±3

±2

±1

0

1

2

3

4

5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

Charge Pump Voltage (V)

Kpd = 8x

Kpd = 16x

Kpd = 31x

C002

LMX2492, LMX2492-Q1

www.ti.com

SNAS624B – MARCH 2014 – REVISED MAY 2015

7.8 Typical Characteristics

For a charge pump supply of 3.3 V, optimal performance is for a

For a charge pump supply voltage of 5 volts or higher, optimal

typical charge pump output voltage between 0.5 and 2.8 volts.

performance is typically for a charge pump output voltage between

0.5 and 4.5 volts.

Figure 2. Charge Pump Current for Vcp = 3.3 V

Figure 3. Charge Pump Current for Vcp = 5.5 V

Typical value of lowest power level as a function of frequency. Design to electrical specifications for input sensitivity, not typical performance

graphs.

Figure 4. Fin Input Sensitivity

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