Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
ELECTRICAL CHARACTERISTICS
SYMBOL
t
OUT
f
OUT
∆f
OUT
∆f
OUT
/∆T
∆f
OUT
/∆V
+
PARAMETER
Output Clock Period
Output Frequency
Frequency Accuracy (Note 4)
Frequency Drift Over Temperature
Frequency Drift Over Supply
Long-Term Frequency Stability
Period Jitter (Note 10)
BW
t
S
Analog Inputs
V
SET
∆V
SET
/∆T
R
SET
V
DIV
∆V
DIV
/∆V
+
Frequency Modulation Bandwidth
Frequency Change Settling Time (Note 9)
Voltage at SET Pin
V
SET
Drift Over Temperature
Frequency-Setting Resistor
DIV Pin Voltage
DIV Pin Valid Code Range (Note 5)
DIV Pin Input Current
Power Supply
V
+
Operating Supply Voltage Range
Power-On Reset Voltage
I
S
Supply Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Test conditions are V
+
= 2.25V to 5.5V, RST = 0V for LTC6995-1,
RST
= V
+
for LTC6995-2, DIVCODE = 0 to 15 (N
DIV
= 1 to 2
21
), R
SET
= 50k to 800k, R
LOAD
= 5k, C
LOAD
= 5pF unless otherwise noted.
CONDITIONS
MIN
1.024m
29.1µ
l
l
TYP
29.1µHz ≤ f
OUT
≤ 977Hz
V
+
= 4.5V to 5.5V
V
+
= 2.25V to 4.5V
(Note 11)
N
DIV
= 1
N
DIV
= 8
±0.8
±0.005
0.23
0.06
90
15
7
0.4 • f
OUT
1
0.97
50
0
1.00
±75
MAX
34,360
977
±1.5
±2.2
0.55
0.16
l
l
UNITS
Seconds
Hz
%
%
%/°C
%/V
%/V
ppm/√kHr
ppm
RMS
ppm
RMS
Hz
Cycle
V
µV/°C
kΩ
V
%
nA
V
V
µA
µA
µA
µA
µA
µA
µA
µA
l
l
l
l
1.03
800
V
+
±1.5
±10
Deviation from Ideal
V
DIV
/V
+
= (DIVCODE + 0.5)/16
l
l
l
l
2.25
135
105
100
80
65
55
60
52
R
L
= ∞, R
SET
= 50k
R
L
= ∞, R
SET
= 100k
R
L
= ∞, R
SET
= 800k
R
L
= ∞, I
SET
= 0µA
V
+
= 5.5V
V
+
= 2.25V
V
+
= 5.5V
V
+
= 2.25V
V
+
= 5.5V
V
+
= 2.25V
V
+
= 5.5V
V
+
= 2.25V
l
l
l
l
l
l
5.5
1.95
170
135
130
105
100
85
For more information
www.analog.com
3
Rev. B
LTC6995-1/LTC6995-2
ELECTRICAL CHARACTERISTICS
SYMBOL
Digital I/O
PARAMETER
RST Pin Input Capacitance
RST Pin Input Current
High Level RST Pin Input Voltage
Low Level RST Pin Input Voltage
Output Current
High Level Output Voltage (Note 7)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. Test conditions are V
+
= 2.25V to 5.5V, RST = 0V for LTC6995-1,
RST
= V
+
for LTC6995-2, DIVCODE = 0 to 15 (N
DIV
= 1 to 2
21
), R
SET
= 50k to 800k, R
LOAD
=
∞,
C
LOAD
= 5pF unless otherwise noted.
CONDITIONS
MIN
TYP
2.5
RST = 0V to V
+
(Note 6)
(Note 6)
V
+
= 2.7V to 5.5V
V
+
= 5.5V
V
+
= 3.3V
V
+
= 2.25V
±10
l
l
MAX
UNITS
pF
nA
V
V
mA
V
V
V
V
V
V
V
V
V
V
V
V
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
IH
V
IL
I
OUT(MAX)
V
OH
0.7 • V
+
0.3 • V
+
5.45
4.84
3.24
2.75
2.17
1.58
±20
5.48
5.15
3.27
2.99
2.21
1.88
0.02
0.26
0.03
0.22
0.03
0.26
16
24
40
5
1.1
1.7
2.7
1.0
1.6
2.4
V
OL
Low Level Output Voltage (Note 7)
V
+
= 5.5V
V
+
= 3.3V
V
+
= 2.25V
t
RST
t
WIDTH
t
r
t
f
Reset Propagation Delay
Minimum Input Pulse Width
Output Rise Time (Note 8)
Output Fall Time (Note 8)
V
+
= 5.5V
V
+
= 3.3V
V
+
= 2.25V
V
+
= 3.3V
V
+
= 5.5V
V
+
= 3.3V
V
+
= 2.25V
V
+
= 5.5V
V
+
= 3.3V
V
+
= 2.25V
I
OUT
= –1mA
I
OUT
= –16mA
I
OUT
= –1mA
I
OUT
= –10mA
I
OUT
= –1mA
I
OUT
= –8mA
I
OUT
= 1mA
I
OUT
= 16mA
I
OUT
= 1mA
I
OUT
= 10mA
I
OUT
= 1mA
I
OUT
= 8mA
l
l
l
l
l
l
l
l
l
l
l
l
0.04
0.54
0.05
0.46
0.07
0.54
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:
The LTC6995C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 3:
The LTC6995C is guaranteed to meet specified performance from
0°C to 70°C. The LTC6995C is designed, characterized and expected to
meet specified performance from –40°C to 85°C but it is not tested or
QA sampled at these temperatures. The LTC6995I is guaranteed to meet
specified performance from –40°C to 85°C. The LTC6995H is guaranteed
to meet specified performance from –40°C to 125°C. The LTC6995MP is
guaranteed to meet specified performance from –55°C to 125°C.
Note 4:
Frequency accuracy is defined as the deviation from the f
OUT
equation, assuming R
SET
is used to program the frequency.
Note 5:
See Operation section, Table 1 and Figure 2 for a full explanation
of how the DIV pin voltage selects the value of DIVCODE.
Note 6:
The RST pin has hysteresis to accommodate slow rising or falling
signals. The threshold voltages are proportional to V
+
. Typical values can
be estimated at any supply voltage using V
RST(RISING)
≈ 0.55 • V
+
+ 185mV
and V
RST(FALLING)
≈ 0.48 • V
+
– 155mV.
Note 7:
To conform to the Logic IC Standard, current out of a pin is
arbitrarily given a negative value.
Note 8:
Output rise and fall times are measured between the 10% and the
90% power supply levels with 5pF output load. These specifications are
based on characterization.
Note 9:
Settling time is the amount of time required for the output to settle
within ±1% of the final frequency after a 0.5× or 2× change in I
SET
.
Note 10:
Jitter is the ratio of the deviation of the period to the mean of the
period. This specification is based on characterization and is not 100%
tested.
Note 11:
Long-term drift of silicon oscillators is primarily due to the
movement of ions and impurities within the silicon and is tested at 30°C
under otherwise nominal operating conditions. Long-term drift is specified
as ppm/√kHr due to the typically nonlinear nature of the drift. To calculate
drift for a set time period, translate that time into thousands of hours, take
the square root and multiply by the typical drift number. For instance, a
year is 8.77kHr and would yield a drift of 266ppm at 90ppm/√kHr. Drift
without power applied to the device may be approximated as 1/10th of the
drift with power, or 9ppm/√kHr for a 90ppm/√kHr device.
DSP 与 ARM 处理器
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
