Datasheet
LTC6906
3
6906fc
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Some frequencies may be generated using two different values of
R
SET
. For these frequencies, the error is specified assuming that the larger
value of R
SET
is used.
Note 3: Frequency accuracy is defined as the deviation from the f
OUT
equation.
Note 4: Jitter is the ratio of the peak-to-peak deviation of the period to the
mean of the period. This specification is based on characterization and is
not 100% tested.
Note 5: Current into a pin is given as a positive value. Current out of a pin
is given as a negative value.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
SET
Frequency-Setting Resistor Range
l
100 1000 kΩ
Δf/ΔT Frequency Drift Over Temp (Note 3) R
SET
= 316k
l
±0.005 %/°C
Δf/ΔV Frequency Drift Over Supply (Note 3) V
+
= 2.25V to 3.6V, 100k ≤ R
SET
≤ 1000k 0.06 %/V
Timing Jitter (Note 4) Pin 3 = V
+
, 100k ≤ R
SET
≤ 1000k
Pin 3 = Open, 100k ≤ R
SET
≤ 1000k
Pin 3 = 0V, 100k ≤ R
SET
≤ 1000k
0.03
0.07
0.15
%
%
%
S
f
Long-Term Stability of Output Frequency Pin 3 = V
+
300 ppm/√kHr
DC Duty Cycle
l
45 50 55 %
V
+
Operating Supply Range (Note 8)
l
2.25 3.6 V
I
S
Power Supply Current R
SET
= 1000k, Pin 3 = 0V, R
L
= 10M V
+
= 3.6V
(DIV = 1, f
OUT
= 100kHz) V
+
= 2.25V
l
l
12.5
10.0
18
15
μA
μA
R
SET
= 100k, Pin 3 = 0V, R
L
= 10M V
+
= 3.6V
(DIV = 1, f
OUT
= 1MHz) V
+
= 2.25V
l
l
78
60
100
80
μA
μA
V
IH
High Level DIV Input Voltage V
+
= 3.6V
V
+
= 2.25V
l
l
3.1
2.05
V
V
V
IL
Low Level DIV Input Voltage V
+
= 3.6V
V
+
= 2.25V
l
l
0.5
0.2
V
V
I
DIV
DIV Input Current (Note 5) Pin 3 = V
+
Pin 3 = 0V
l
l
–2
1
–1
2μA
μA
V
OH
High Level Output Voltage (Note 5) V
+
= 3.6V I
OH
= –100μA
I
OH
= –1mA
l
l
3.40
2.80
3.59
3.30
V
V
V
+
= 2.25V I
OH
= –100μA
I
OH
= –1mA
l
l
2.15
1.75
2.2
2.0
V
V
V
OL
Low Level Output Voltage (Note 5) V
+
= 3.6V I
OL
= 100μA
I
OL
= 1mA
l
l
0.02
0.15
0.2
0.8
V
V
V
+
= 2.25V I
OL
= 100μA
I
OL
= 1mA
l
l
0.03
0.30
0.1
0.5
V
V
t
r
OUT Rise Time (Note 6) V
+
= 3.6V
V
+
= 2.25V
10
25
ns
ns
t
f
OUT Fall Time (Note 6) V
+
= 3.6V
V
+
= 2.25V
10
25
ns
ns
VGS GRD Pin Voltage Relative to SET Pin
Voltage
–10μA ≤ I
GRD
≤ 0.3μA
l
–10 10 mV
Note 6: Output rise and fall times are measured between the 10% and
90% power supply levels.
Note 7: The LTC6906C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6906C is designed, characterized and ex pected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC6906I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 8: Consult the Applications Information section for operation with
supplies higher than 3.6V.
Note 9: Test conditions reflect the master oscillator frequency. The output
divider is functionally tested and divided frequency accuracy is guaranteed
by design.