Datasheet

LTC6990
25
6990fc
For more information www.linear.com/LTC6990
6990 TA09
LTC6990
OE
GND
SET
OUT
V
+
DIV
R1
1M
2k
1M
SINE COSINE
R2
280k
*1/2 OF AN LTC1060 FILTER CAN
BE USED IN PLACE OF THE LTC1059
0.1µF
4.12k
1M
R
SET
49.9k
R
VCO
267k
FREQ
ADJ
5V
5V
–
+
LTC1440
OUT
1.18V
REF
HYST
LT1004-2.5V
2.5V
2.5V FOR 5Hz TO 10kHz
5V FOR 10Hz TO 20kHz
50/100
BPS1
N
+
–
–
LP
CLOCK
LTC1059*
S
A
V
CC
V
–
5V
AGND
–
+
10k
124k
5.11k
INV1
51.1k
1.18V
REF
5V
14
8
142
3
5 11 9
Quadrature Sine Wave Oscillator. Voltage Controlled Frequency Range
from ~5Hz to ~20kHz with 1V
P-P
Constant Output Amplitude
TYPICAL APPLICATIONS
6990 TA10
LTC6990
OE
GND
SET
OUT
V
+
DIV
1M
523k21.5k
+
22k AT 25°C
B = 3964
THERMISTOR: VISHAY NTHS120601N2202J
5V
f
OUT
5V
60.4k
Temperature to Frequency Converter.
3% Linearity from –20°C (f
OUT
≈ 20kHz) to 75°C (f
OUT
≈ 25kHz)