Datasheet

LTC6990
22
6990fc
For more information www.linear.com/LTC6990
TYPICAL APPLICATIONS
Full Range VCO with Any N
DIV
Setting (f
MAX
to f
MIN
for V
IN
= 0V to V
SET
)
6990 TA03
LTC6990
5V
OE
GND
SET
OUT
V
+
DIV
C1
0.1µF
R1
R2
R
SET
826k
5V
5V
D1
IN4148
–
+
LT1490
R
VCO1
26.1k
V
IN
0V TO 1V
R
VCO2
26.1k
Full Range VCO with Any N
DIV
Setting (Positive Frequency Control, f
MIN
to f
MAX
for V
IN
= 0V to V
SET
6990 TA04
LTC6990
5V
OE
GND
SET
OUT
V
+
DIV
C1
0.1µF
R1
R2
R
SET2
412k
R
SET1
412k
5V
5V
–
+
LT1490
R3
10k
V
IN
0V TO 1V
R4
10k
R
VCO
53.6k
Programming N
DIV
Using an 8-Bit DAC
6990 TA02
LTC6990
OE
GND
SET
OUT
V
+
DIV
C1
0.1µF
R
SET
619k
2.25V TO 5.5V
C2
0.1µF
µPLTC2630-LZ8
SDI
SCK
CS/LD
V
CC
GND
V
OUT
DIVCODE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DAC CODE
0
24
40
56
72
88
104
120
136
152
168
184
200
216
232
255