LTC6990HS6-TRPBF datasheet(11/28 Pages) LINER

Part #	LTC6990HS6-TRPBF

Description	TimerBlox: Voltage Controlled Silicon Oscillator

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Manufacturer	LINER [Linear Technology]

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LTC6990

11

6990p

Table 1. DIVCODE Programming

DIVCODE

Hi-Z

NDIV

Recommended fOUT

R1 (k)

R2 (k)

VDIV/V+

0

1

62.5kHz to 1MHz

Open

Short

≤ 0.03125 ±0.015

1

0

2

31.25kHz to 500kHz

976

102

0.09375 ±0.015

2

0

4

15.63kHz to 250kHz

976

182

0.15625 ±0.015

3

0

8

7.813kHz to 125kHz

1000

280

0.21875 ±0.015

4

0

16

3.906kHz to 62.5kHz

1000

392

0.28125 ±0.015

5

0

32

1.953kHz to 31.25kHz

1000

523

0.34375 ±0.015

6

0

64

976.6Hz to 15.63kHz

1000

681

0.40625 ±0.015

7

0

128

488.3Hz to 7.813kHz

1000

887

0.46875 ±0.015

8

1

128

488.3Hz to 7.813kHz

887

1000

0.53125 ±0.015

9

1

64

976.6Hz to 15.63kHz

681

1000

0.59375 ±0.015

10

1

32

1.953kHz to 31.25kHz

523

1000

0.65625 ±0.015

11

1

16

3.906kHz to 62.5kHz

392

1000

0.71875 ±0.015

12

1

8

7.813kHz to 125kHz

280

1000

0.78125 ±0.015

13

1

4

15.63kHz to 250kHz

182

976

0.84375 ±0.015

14

1

2

31.25kHz to 500kHz

102

976

0.90625 ±0.015

15

1

62.5kHz to 1MHz

Short

Open

≥ 0.96875 ±0.015

OPERATION

Table 1 offers recommended 1% resistor values that ac-

curately produce the correct voltage division as well as the

corresponding NDIV and Hi-Z values for the recommended

resistor pairs. Other values may be used as long as:

1. The VDIV/V+ ratio is accurate to ±1.5% (including resis-

tor tolerances and temperature effects)

2. The driving impedance (R1||R2) does not exceed

500kΩ.

If the voltage is generated by other means (i.e. the output

of a DAC) it must track the V+ supply voltage. The last

column in Table 1 shows the ideal ratio of VDIV to the

supply voltage, which can also be calculated as:

VDIV

V+

= DIVCODE + 0.5

16

± 1.5%

For example, if the supply is 3.3V and the desired DIVCODE

is 4, VDIV = 0.281 • 3.3V = 928mV ± 50mV.

Figure 2 illustrates the information in Table 1, showing that

NDIV is symmetric around the DIVCODE midpoint.

0.5• V+

6990 F02

1000

100

10

1

0.1

INCREASING VDIV

V+

0V

RECOMMENDED RANGE

EXTENDED RANGE

Hi-Z BIT = 0

Hi-Z BIT = 1

0

15

1

3

2

5

4

7

6

9

8

11

10

13

12

14

Figure 2. Frequency Range and Hi-Z Bit vs DIVCODE

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