Datasheet
LTC6905
4
6905fd
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Frequency
Frequency Error vs R
SET
Frequency Error vs Supply Voltage
FREQUENCY (MHz)
0
SUPPLY CURRENT (mA)
10
12
14
200
6905 G01
8
÷4
÷4
÷1
÷1
6
0
2
50
100
150
4
18
16
5.5V
2.7V
÷2
÷2
R
SET
(kΩ)
10
FREQUENCY ERROR (%)
0
0.20
0.40
22
6905 G02
–0.20
–0.40
12 14 16 18 20 24
–0.60
–0.80
0.60
SUPPLY VOLTAGE (V)
2.5
–0.40
FREQUENCY ERROR (%)
–0.20
0.20
0.40
0.60
4.5
1.40
6905 G03
0
3.5
3
5
4 5.5
0.80
1.00
1.20
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OL
Low Level Output Voltage (Note 4) V
+
= 5.5V, Pin 4 = 0V I
OL
= 1mA
I
OL
= 4mA
l
l
0.05
0.2
0.25
0.3
V
V
V
+
= 2.7V, Pin 4 = 0V I
OL
= 1mA
I
OL
= 4mA
l
l
0.1
0.4
0.3
0.5
V
V
t
r
, t
f
OUT Rise/Fall Time (Note 5) 0.5 ns
V
SET
Voltage at R
SET
Pin V
+
= 5.5V
V
+
= 2.7V
l
l
4.27
1.61
4.5
1.7
4.73
1.79
V
V
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full specifi ed
temperature range, otherwise specifi cations are at T
A
= 25°C or as noted. V
+
= 2.7V to 5.5V, R
L
= 15k, C
L
= 5pF, Pin 4 = V
+
unless
otherwise noted. All voltages are with respect to GND.
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: Frequency accuracy is defi ned as the deviation from the f
OSC
equation. Accuracy is tested with DIV = V
+
, N = 1 and other divide ratios
are guaranteed by design.
Note 3: Jitter is the ratio of the peak-to-peak distribution of the period to
the mean of the period. This specifi cation is based on characterization and
is not 100% tested.
Note 4: To conform with the Logic IC Standard convention, current out of
a pin is arbitrarily given as a negative value.
Note 5: Output rise and fall times are measured between the 10% and
90% power supply levels.
Note 6: A heat sink may be required to keep the junction temperature
below the absolute maximum when the output is shorted indefi nitely.
Note 7: The LTC6905C is guaranteed functional over the operating
temperature range.
Note 8: The LTC6905C is guaranteed to meet specifi ed performance from
0°C to 70°C. The LTC6905C-XXX is designed, characterized and expected
to meet specifi ed performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC6905I-XXX is guaranteed to meet
specifi ed performance from –40°C to 85°C.
Note 9: The LTC6905 is optimized for the performance with a 3V power
supply voltage. Please consult LTC Marketing for parts optimized for 5V
operation.