Datasheet
LTC6909
3
6909fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
SET
Range of the R
SET
Resistor
Connected Between the V
+
A Pin and
the SET Pin
4.5V ≤ V
+
≤ 5.5V
2.7V ≤ V
+
≤ 4.5V
10
20
2000
2000
kΩ
kΩ
Frequency Spread with SSFM
Enabled
R
SET
= 100k
MOD Pin = V
+
, GND or Open
l
±7 ±10 ±13 %
Long-Term Stability of the Output
Frequency (Note 9)
300 ppm/√kHr
Duty Cycle (Note 6) SSFM Disabled
l
45 50 55 %
V
+
A, V
+
D Operating Supply Voltage Range
l
2.7 5.5 V
I
S
V
+
Combined Supply Current R
SET
= 2M, R
L
= ∞, PH = 8, MOD = V
+
,
(f
OUT
= 12.5kHz), SSFM = f
OUT
/64
V
+
= 5V
V
+
= 2.7V
l
l
0.6
0.55
0.85
0.8
mA
mA
R
SET
= 20k, R
L
= ∞, PH = 3, MOD = GND,
(f
OUT
= 3.33MHz), SSFM = f
OUT
/16
V
+
= 5V
V
+
= 2.7V
l
l
2.4
1.55
2.7
1.8
mA
mA
R
SET
= 2M, R
L
= ∞, PH = 8, MOD = OUT1,
(f
OUT
= 12.5kHz), SSFM Off
V
+
= 5V
V
+
= 2.7V
l
l
0.4
0.37
0.65
0.6
mA
mA
V
IH_MOD
High Level MOD Input Voltage
l
V
+
– 0.4 V
V
IL_MOD
Low Level MOD Input Voltage
l
0.4 V
I
MOD
MOD Input Current (Note 7) MOD Pin = V
+
, V
+
= 5V
MOD Pin = GND, V
+
= 5V
l
l
–4
2
–2
4 µA
µA
V
IH_PH
High Level PHx Input Voltage PHx Refers to PH0, PH1 and PH2
l
V
+
– 0.4 V
V
IL_PH
Low Level PHx Input Voltage PHx Refers to PH0, PH1 and PH2
l
0.4 V
I
IN_PHX
Digital Input Current, PH0, PH1, PH2 0V < V
IN
< V
+
l
±1 µA
V
OH
High Level Output Voltage
(OUT1 Through OUT8)(Note 7)
V
+
= 5V No Load
5mA Load to GND
l
4.35
4.92
4.65
V
V
V
+
= 2.7V No Load
3mA Load to GND
l
2.1
2.63
2.4
V
V
V
OL
Low Level Output Voltage
(OUT1 Through OUT8)(Note 7)
V
+
= 5V No Load
5mA Load to V
+
l
0.07
0.25
0.55
V
V
V
+
= 2.7V No Load
3mA Load to V
+
l
0.07
0.25
0.55
V
V
t
r
Output Rise Time (Note 8) V
+
= 5V
V
+
= 2.7V
1.6
2.5
ns
ns
t
f
Output Fall Time (Note 8) V
+
= 5V
V
+
= 2.7V
1.6
2
ns
ns
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C or as noted. Test conditions are V
+
= V
+
A = V
+
D = 2.7V to 5.5V, R
L
= 5k,
C
L
= 5pF unless otherwise noted. The modulation is turned off (MOD is connected to OUT1) and PH = 8 unless otherwise specified.
R
SET
is defined as the resistor connected from the SET pin to the V
+
A pin.
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: LTC6909C and the LTC6909I are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 3: The LTC6909C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6909C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but is not tested or QA
sampled at these temperatures. The LTC6909I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6909H is guaranteed
to meet specified performance from –40°C to 125°C.