Datasheet

LTC6990
7
6990fc
For more information www.linear.com/LTC6990
Rise and Fall Time
vs Supply Voltage
Output Disable Propagation Delay
(t
PD
) vs Supply Voltage
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Modulation
Frequency Modulation
Typical I
SET
Current Limit vs V
+
Typical Output Waveform
SUPPLY VOLTAGE (V)
RISE/FALL TIME (ns)
6990 G16
3.0
1.5
2.5
1.0
0.5
2.0
0
2 43 5 6
T
A
= 25°C
C
LOAD
= 5pF
t
RISE
t
FALL
SUPPLY VOLTAGE (V)
PROPAGATION DELAY (ns)
6990 G17
50
20
40
10
30
25
45
15
5
35
0
2 43 5 6
T
A
= 25°C
C
LOAD
= 5pF
SUPPLY VOLTAGE (V)
I
SET
(µA)
6990 G18
1000
400
800
200
600
0
2 43 5 6
T
A
= 25°C
SET PIN SHORTED TO GND
20µs/DIV
6990 G19
OUT
2V/DIV
OE
2V/DIV
V
+
= 3.3V
DIVCODE = 2
R
SET
= 200k
20µs/DIV
6990 G20
OUT
2V/DIV
V
CTRL
2V/DIV
f
OUT
50kHz/DIV
V
+
= 3.3V, DIVCODE = 0
R
SET
= 200k, R
VCO
= 464k
f
OUT
= 175kHz to 350kHz
20µs/DIV
6990 G21
OUT
2V/DIV
V
CTRL
2V/DIV
f
OUT
50kHz/DIV
V
+
= 3.3V, DIVCODE = 0
R
SET
= 200k, R
VCO
= 464k
f
OUT
= 175kHz to 350kHz
V
+
= 3V, unless otherwise noted.
Typical Frequency Error vs
Time (Long-Term Drift)
TIME (h)
DELTA FREQUENCY (ppm)
6990 G15a
50
0
150
–150
–100
–50
100
200
–200
0 1200400 800 1600 2000 2400 2800
65 UNITS
SOT-23 AND DFN PARTS
T
A
= 30°C