LTC6900 Datasheet PDF - Linear Technology
| Part Number | LTC6900 | |
| Description | 1kHz to 20MHz Resistor Set SOT-23 Oscillator | |
| Manufacturers | Linear Technology | |
| Logo |  |
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There is a preview and LTC6900 download ( pdf file ) link at the bottom of this page. Total 12 Pages | ||
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FEATURES
s One External Resistor Sets the Frequency
s 1kHz to 20MHz Frequency Range
s 500µA Typical Supply Current, VS = 3V, 3MHz
s Frequency Error ≤1.5% Max, 5kHz to 10MHz
(TA = 25°C)
www.DataShseetF4rUe.cqoumency Error ≤ 2% Max, 5kHz to 10MHz
(TA = 0°C to 70°C)
s ±40ppm/°C Temperature Stability
s 0.04%/V Supply Stability
s 50% ±1% Duty Cycle 1kHz to 2MHz
s 50% ±5% Duty Cycle 2MHz to 10MHz
s Fast Start-Up Time: 50µs to 1.5ms
s 100Ω CMOS Output Driver
s Operates from a Single 2.7V to 5.5V Supply
s Low Profile (1mm) ThinSOTTM Package
U
APPLICATIO S
s Portable and Battery-Powered Equipment
s PDAs
s Cell Phones
s Low Cost Precision Oscillator
s Charge Pump Driver
s Switching Power Supply Clock Reference
s Clocking Switched Capacitor Filters
s Fixed Crystal Oscillator Replacement
s Ceramic Oscillator Replacement
LTC6900
Low Power, 1kHz to 20MHz
Resistor Set SOT-23 Oscillator
DESCRIPTIO
The LTC®6900 is a precision, low power oscillator that is
easy to use and occupies very little PC board space. The
oscillator frequency is programmed by a single external
resistor (RSET). The LTC6900 has been designed for high
accuracy operation (≤1.5% frequency error) without the
need for external trim components.
The LTC6900 operates with a single 2.7V to 5.5V power
supply and provides a rail-to-rail, 50% duty cycle square
wave output. The CMOS output driver ensures fast rise/fall
times and rail-to-rail switching. The frequency-setting
resistor can vary from 10kΩ to 2MΩ to select a master
oscillator frequency between 100kHz and 20MHz (5V
supply). The three-state DIV input determines whether the
master clock is divided by 1, 10 or 100 before driving the
output, providing three frequency ranges spanning 1kHz
to 20MHz (5V supply). The LTC6900 features a proprietary
feedback loop that linearizes the relationship between
RSET and frequency, eliminating the need for tables to
calculate frequency. The oscillator can be easily pro-
grammed using the simple formula outlined below:
100, DIV Pin = V +
fOSC
=
10MHz
•
20k
N • RSET
,
N
=
10,
1,
DIV Pin = Open
DIV Pin = GND
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
Clock Generator
5V
10k ≤ RSET ≤ 2M
0.1µF
1 V+
1kHz ≤ fOSC ≤ 20MHz
5
OUT
2 LTC6900
GND
5V, N = 100
34
SET DIV
( )fOSC = 10MHz •
20k
N • RSET
N=1
OPEN, N = 10
6900 TA01
RSET vs Desired Output Frequency
10000
1000
÷100 ÷10 ÷1
100
10
1
1k 10k 100k 1M 10M 100M
DESIRED OUTPUT FREQUENCY (Hz)
6900 F02
6900f
1
|
| |
 
LTC6900
PI FU CTIO S
V+ (Pin 1): Voltage Supply (2.7V ≤ V+ ≤ 5.5V). This supply
must be kept free from noise and ripple. It should be
bypassed directly to a ground plane with a 0.1µF capacitor.
GND (Pin 2): Ground. Should be tied to a ground plane for
best performance.
SET (Pin 3): Frequency-Setting Resistor Input. The value
of the resistor connected between this pin and V+ deter-
www.DataShmeeitn4eUs.ctohme oscillator frequency. The voltage on this pin is
held by the LTC6900 to approximately 1.1V below the V+
voltage. For best performance, use a precision metal film
resistor with a value between 10kΩ and 2MΩ and limit the
capacitance on this pin to less than 10pF.
DIV (Pin 4): Divider-Setting Input. This three-state input
selects among three divider settings, determining the
value of N in the frequency equation. Pin 4 should be tied
to GND for the ÷1 setting, the highest frequency range.
Floating Pin 4 divides the master oscillator by 10. Pin 4
should be tied to V+ for the ÷100 setting, the lowest
frequency range. To detect a floating DIV pin, the LTC6900
attempts to pull the pin toward midsupply. Therefore,
driving the DIV pin high requires sourcing approximately
2µA. Likewise, driving DIV low requires sinking 2µA.
When Pin 4 is floated, it should preferably be bypassed by
a 1nF capacitor to ground or it should be surrounded by a
ground shield to prevent excessive coupling from other
PCB traces.
OUT (Pin 5): Oscillator Output. This pin can drive 5kΩ
and/or 10pF loads. Heavier loads may cause inaccuracies
due to supply bounce at high frequencies. Voltage tran-
sients, coupled into Pin 5, above or below the LTC6900
power supplies will not cause latchup if the current into/
out of the OUT pin is limited to 50mA.
BLOCK DIAGRA
RSET
V+
1
IRES SET
3
VBIAS
2 GND
VRES = (V+ – VSET) = 1.1V TYPICALLY
+
GAIN = 1
–
MASTER OSCILLATOR
ƒMO
=
10MHz
•
20kΩ
•
(V
IRES
+ – VSET)
IRES
PATENT PENDING
PROGRAMMABLE
DIVIDER (N)
(÷1, 10 OR 100)
DIVIDER
SELECT
THREE-STATE
INPUT DETECT
OUT
5
V+
+– 2µA
DIV
4
+– 2µA
GND
6900 BD
6900f
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for LTC6900 electronic component. |
| Information | Total 12 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ LTC6900.PDF Datasheet ] | |
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