LTC6990 Linear Technology, LTC6990 Datasheet - Page 22

• Manufacturer Part Number: LTC6990
• Description: TimerBlox: Voltage Controlled Silicon Oscillator
• Manufacturer: Linear Technology

TYPICAL APPLICATIONS
LTC6990
22
Full Range VCO with Any N
R
619k
SET
OE
GND
SET
0V TO 1V
0V TO 1V
LTC6990
V
V
IN
IN
Full Range VCO with Any N
OUT
DIV
V
+
R
26.1k
10k
VCO1
R3
C1
0.1μF
DIV
2.25V TO 5.5V
–
+
–
+
LT1490
LT1490
Programming N
Setting (Positive Frequency Control, f
5V
5V
10k
R4
R
26.1k
C2
0.1μF
VCO2
V
DIV
OUT
D1
IN4148
R
53.6k
Setting (f
VCO
LTC2630-LZ8
DIV
Using an 8-Bit DAC
GND
V
R
826k
R
412k
R
412k
CC
5V
5V
SET
SET1
SET2
MAX
CS/LD
OE
GND
SET
OE
GND
SET
SCK
SDI
to f
LTC6990
LTC6990
MIN
6990 TA04
6990 TA03
OUT
OUT
for V
DIV
DIV
V
V
+
+
MIN
μP
6990 TA02
IN
= 0V to V
to f
C1
0.1μF
MAX
C1
0.1μF
DIVCODE
for V
SET
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
R1
R2
R1
R2
)
IN
= 0V to V
5V
5V
DAC CODE
104
120
136
152
168
184
200
216
232
255
24
40
56
72
88
0
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SET
6990p