Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

LTC6930 Datasheet(PDF) 11 Page - Analog Devices

Part # LTC6930
Description  TimerBlox: Voltage Controlled Silicon Oscillator
PDF  30 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC6930 Datasheet(HTML) 11 Page - Analog Devices

Back Button LTC6930 Datasheet HTML 7Page - Analog Devices LTC6930 Datasheet HTML 8Page - Analog Devices LTC6930 Datasheet HTML 9Page - Analog Devices LTC6930 Datasheet HTML 10Page - Analog Devices LTC6930 Datasheet HTML 11Page - Analog Devices LTC6930 Datasheet HTML 12Page - Analog Devices LTC6930 Datasheet HTML 13Page - Analog Devices LTC6930 Datasheet HTML 14Page - Analog Devices LTC6930 Datasheet HTML 15Page - Analog Devices Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 30 page
background image
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



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com