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LTC6906 Datasheet(PDF) 11 Page - Analog Devices

Part # LTC6906
Description  TimerBlox: Voltage Controlled Silicon Oscillator
PDF  30 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC6906 Datasheet(HTML) 11 Page - Analog Devices

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LTC6990
11
Rev. D
For more information www.analog.com
Table 1. DIVCODE Programming
DIVCODE
Hi-Z
NDIV
Recommended fOUT
R1 (k)
R2 (k)
VDIV/V+
0
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
1
62.5kHz to 1MHz
Short
Open
≥ 0.96875 ±0.015
OPERATION
Table 1 offers recommended 1% resistor values that accu-
rately 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.
On start-up, the DIV pin A/D converter must determine
the correct DIVCODE before the output is enabled. If VDIV
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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