LTC6909_15 Datasheet, PDF (3/22 Pages) Linear Technology – 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

LTC6909
Electrical Characteristics 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 =
R_SET
5pF unless otherwise noted. The modulation
is defined as the resistor connected from the
is turned off (MOD
SET pin to the V⁺A
is connected
pin.
to
OUT1)
and
PH
=
8
unless
otherwise
specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
R_SET
C^Ro^ann^gn^eec^ote^f d^thB^ee^Rtw^SEe^Ten^Reth^se^isV^to+rA Pin and
4.5V ≤ V⁺ ≤ 5.5V
2.7V ≤ V⁺ ≤ 4.5V
the SET Pin
10
2000
kΩ
20
2000
kΩ
Frequency Spread with SSFM
Enabled
R_SET
MOD
= 100k
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⁺,
(Vf_{+OU=T5=V12.5kHz),} SSFM = f_OUT/64
V⁺ = 2.7V
l
0.6
0.85
mA
l
0.55
0.8
mA
R_SET = 20k, R_L = ∞, PH = 3, MOD = GND,
(f_OUT = 3.33MHz), SSFM = f_OUT/16
V⁺ = 5V
l
V⁺ = 2.7V
l
2.4
2.7
mA
1.55
1.8
mA
R_SET = 2M, R_L = ∞, PH = 8, MOD = OUT1,
V(f^+OU=^T5=V12.5kHz), ^{SSFM Off}
l
V⁺ = 2.7V
l
0.4
0.65
mA
0.37
0.6
mA
V_{IH_MOD} High Level MOD Input Voltage
l V⁺ – 0.4
V
V_{IL_MOD}
I_MOD
Low Level MOD Input Voltage
MOD Input Current (Note 7)
MOD Pin = V⁺, V⁺ = 5V
MOD Pin = GND, V⁺ = 5V
l
0.4
V
l
2
4
µA
l –4
–2
µA
V_{IH_PH} High Level PHx Input Voltage
PHx Refers to PH0, PH1 and PH2
l V⁺ – 0.4
V
V_{IL_PH}
I_{IN_PHX}
V_OH
Low Level PHx Input Voltage
Digital Input Current, PH0, PH1, PH2
High Level Output Voltage
(OUT1 Through OUT8)(Note 7)
PHx Refers to PH0, PH1 and PH2
0V < V_IN < V⁺
V⁺ = 5V
No Load
5mA Load to GND
l
0.4
V
l
±1
µA
4.92
V
l 4.35 4.65
V
V⁺ = 2.7V
No Load
2.63
V
3mA Load to GND
l 2.1
2.4
V
V_OL
Low Level Output Voltage
V⁺ = 5V
(OUT1 Through OUT8)(Note 7)
No Load
5mA Load to V⁺
0.07
V
l
0.25 0.55
V
V⁺ = 2.7V
No Load
3mA Load to V⁺
0.07
V
l
0.25 0.55
V
t_r
Output Rise Time (Note 8)
V⁺ = 5V
V⁺ = 2.7V
1.6
ns
2.5
ns
t_f
Output Fall Time (Note 8)
V⁺ = 5V
V⁺ = 2.7V
1.6
ns
2
ns
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.
6909fa
3