AX8052F131

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9

Table 6. LOGIC

Symbol

Units

Max

Typ

Min

Condition

Description

Input leakage current

−10

10

mA

Programmable Pull−Up Resistance

65

kW

Digital Outputs

P[ABC]x Output Current, high

8

mA

P[ABC]x Output Current, low

8

mA

SYSCLK Output Current, high

8

mA

SYSCLK Output Current, low

8

mA

Tri−state output leakage current

−10

10

mA

AC Characteristics

Table 7. CRYSTAL OSCILLATOR (RF REFERENCE OSCILLATOR)

Symbol

Description

Condition

Min

Typ

Max

Units

Crystal frequency

Notes 1, 3

15.5

16

25

MHz

Transconductance oscillator

AX5031_XTALOSCGM = 0000

1

mS

AX5031_XTALOSCGM = 0001

2

AX5031_XTALOSCGM = 0010

default

3

AX5031_XTALOSCGM = 0011

4

AX5031_XTALOSCGM = 0100

5

AX5031_XTALOSCGM = 0101

6

AX5031_XTALOSCGM = 0110

6.5

AX5031_XTALOSCGM = 0111

7

AX5031_XTALOSCGM = 1000

7.5

AX5031_XTALOSCGM = 1001

8

AX5031_XTALOSCGM = 1010

8.5

AX5031_XTALOSCGM = 1011

9

AX5031_XTALOSCGM = 1100

9.5

AX5031_XTALOSCGM = 1101

10

AX5031_XTALOSCGM = 1110

10.5

AX5031_XTALOSCGM = 1111

11

Programmable tuning capacitors at pins

CLK16N and CLK16P

AX5031_XTALCAP = 000000

default

2

pF

AX5031_XTALCAP = 111111

33

Programmable tuning capacitors,

increment per LSB of AX5031_XTALCAP

0.5

pF

External clock input (TCXO)

Notes 2, 3

15.5

15

25

MHz

Oscillator amplitude at pin CLK16P

0.5

V

Input DC impedance

10

kW

1. Tolerances and start−up times depend on the crystal used. Depending on the RF frequency and channel spacing the IC must be calibrated

to the exact crystal frequency using the readings of the register AX5031_TRKFREQ.

2. If an external clock is used, it should be input via an AC coupling at pin CLK16P with the oscillator powered up and

AX5031_XTALCAP = 000000

3. Lower frequencies than 15.5 MHz or higher frequencies than 25 MHz can be used. However, not all typical RF frequencies can then be

generated.