LTC6906 Datasheet PDF - Linear Technology
| Part Number | LTC6906 | |
| Description | Micropower | |
| Manufacturers | Linear Technology | |
| Logo |  |
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LTC6906
FEATURES
Micropower, 10kHz to 1MHz
Resistor Set Oscillator
in SOT-23
DESCRIPTION
n Supply Current: 12μA at 100kHz
n <0.65% Frequency Accuracy (from 0°C to 70°C)
n Frequency Range: 10kHz to 1MHz
n One Resistor Sets the Oscillator Frequency
n Single Supply: 2.25V to 5.5V
n –40°C to 125°C Operating Temperature Range
n No Decoupling Capacitor Needed
n Start-Up Time Under 200μs at 1MHz
n First Cycle After Power-Up is Accurate
n 150Ω CMOS Output Driver
n Low Profile (1mm) SOT-23 (ThinSOT™) Package
APPLICATIONS
n Low Cost Precision Programmable Oscillator
n Rugged, Compact Micropower Replacement for
Crystal and Ceramic Oscillators
n High Shock and Vibration Environments
n Portable and Battery-Powered Equipment
n PDAs and Cellular Phones
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
The LTC®6906 is a precision programmable oscillator that
is versatile, compact and easy to use. Micropower opera-
tion benefits portable and battery-powered equipment. At
100kHz, the LTC6906 consumes 12μA on a 3.3V supply.
A single resistor programs the oscillator frequency over
a 10:1 range with better than 0.5% initial accuracy. The
output frequency can be divided by 1, 3 or 10 to span a
100:1 total frequency range, 10kHz to 1MHz.
The LTC6906 is easily programmed according to this
simple formula:
ƒOUT
⎧
=
1MHz
•
⎛
⎜
100k
⎞
⎟,
N
=
⎪
⎨
N ⎝RSET ⎠
⎪
⎩
10,
3,
1,
DIV Pin = V +
DIV Pin = Open
DIV Pin = GND
No decoupling capacitor is needed in most cases, yield-
ing an extremely compact solution occupying less than
20mm2. Contact LTC Marketing for a version of the part
with a shutdown feature or lower frequency operation.
The LTC6906 is available in the 6-lead SOT-23 (ThinSOT)
package.
TYPICAL APPLICATION
Micropower Clock Generator
2.25V TO 3.6V
NO DECOUPLING
CAPACITOR
NEEDED
LTC6906
V+ OUT
10kHz TO 1MHz
10 GND GRD
3 DIV SET
1 RSET
100k TO 1M
6906 TA01
Typical Supply Current vs Frequency
90
CL = 5pF
80 TA = 25°C
70 V+ = 3.6V
60
50
V+ = 2.25V
40
30
20
10
0
0 200 400 600 800 1000 1200
FREQUENCY (kHz)
6906 TA01b
6906fc
1
|
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LTC6906
PIN FUNCTIONS
OUT (Pin 1): Oscillator Output. The OUT pin swings from
GND to V+ with an output resistance of approximately
150Ω. For micropower operation, the load resistance must
be kept as high as possible and the load capacitance as
low as possible.
GND (Pin 2): Ground.
DIV (Pin 3): Divider Setting Input. This three-level input
selects one of three internal digital divider settings, de-
termining the value of N in the frequency equation. Tie to
GND for ÷1, leave floating for ÷3 and tie to V+ for ÷10.
When left floating, the LTC6906 pulls Pin 3 to mid-supply
with a 2.5M resistor. When Pin 3 is floating, care should
be taken to reduce coupling from the OUT pin and its
trace to Pin 3. Coupling can be reduced by increasing the
physical space between traces or by shielding the DIV pin
with grounded metal.
SET (Pin 4): Frequency Setting Resistor Input. Connect
a resistor, RSET, from this pin to GND to set the oscillator
frequency. For best performance use a precision metal- or
thin-film resistor of 0.5% or better tolerance and 50ppm/°C
or better temperature coefficient. For lower accuracy ap-
plications, an inexpensive 1% thick-film resistor may be
used. Limit the capacitance in parallel with RSET to less
than 10pF to reduce jitter and to ensure stability. Capaci-
tance greater than 10pF could cause the LTC6906 internal
feedback circuits to oscillate. The voltage on the SET pin
is approximately 650mV and decreases with temperature
by about –2.2mV/°C.
GRD (Pin 5): Guard Signal. This pin can be used to reduce
PC board leakage across the frequency setting resistor,
RSET. The GRD pin is held within a few millivolts of the
SET pin and shunts leakage current away from the SET pin.
To control leakage, connect a bare copper trace (a trace
with no solder mask) to GRD and loop it around the SET
pin and all PC board metal connected to SET.
V+ (Pin 6): Voltage Supply (2.25V to 3.6V). This supply
is internally decoupled with a 20Ω resistor in series with
an 800pF capacitor. No external decoupling capacitor is
required for OUT pin loads less than 50pF. V+ should be
kept reasonably free of noise and ripple.
BLOCK DIAGRAM
DECOUPLING
NETWORK
V+ 20
6
GND
2
800pF
FREQUENCY-TO-CURRENT
CONVERTERS
fOSC
IFB IFB
VSET VGRD 650mV
ISET = IFB
VSET
SET
4
RSET
BUFFER
GRD
5
VSET
VSET
–
OP AMP
+
VOLTAGE
CONTROLLED
OSCILLATOR
(MASTER OSCILLATOR)
fOSC
fOSC .)[tLĀ3SET
V+
THREE-LEVEL
INPUT
DETECTOR
5M
DIV 3
5M
DIVIDER
SELECT
PROGRAMMABLE
DIVIDER (n)
(1, 3, 10)
150Ω DRIVER
OUT
1
6906 BD
6906fc
5
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC6906 electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LTC6906.PDF Datasheet ] | |
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