Linear Technology LTC6905 Series Guide de configuration rapide
1
dc2073bfa
DEMO MANUAL DC2073B
DESCRIPTION
LTC1799, LTC6900, LTC6905,
LTC6905-XXX, LTC6906, LTC6907
LTC6908 SOT23 Silicon Oscillators
DC2073Bdemoboardfeatures Linear Technology'sSOT23
packaged silicon oscillators. The DC2073B demo board is
available in eleven different options; DC2073B-A through
DC2073B-K. These eleven options provide for the evalu-
ation of resistor-set oscillator ICs and fixed frequency
ICs (Table1).
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2073B
Table 1. Resistor-Set Oscillator ICs and Maximum Frequency Error at TA= 25°C
PART NUMBER, BOARD ASSEMBLY FREQUENCY PROGRAM METHOD DESCRIPTION
LT C
®
6905, DC2073B-A Resistor Programmable 17.225MHz ≤ fOSC ≤ 170MHz, ±1.4% at V+ = 2.7V
and ±2.2% at V+= 5V
LTC1799, DC2073B-B Resistor Programmable 5kHz ≤ fOSC ≤ 10MHz, ±1.5% at V+ = 3V and
±1.5% at V+= 5V (Up to 20MHz)
LTC6900, DC2073B-C Resistor Programmable 5kHz ≤ fOSC ≤ 10MHz, ±1.5% at V+ = 3V and
±1.5% at V+= 5V (Up to 20MHz)
LTC6905-133, DC2073B-D Three Fixed Frequencies Set by Three-State Input fOSC = 133MHz, 66.7MHz and 33.5MHz,
±1.0% at V+= 3V and ±1.5% Typical at V+= 5V
LTC6905-100, DC2073B-E Three Fixed Frequencies Set by Three-State Input fOSC = 100MHz, 50MHz and 25MHz,
±1.0% at V+= 3V and ±1.5% Typical at V+= 5V
LTC6905-96, DC2073B-F Three Fixed Frequencies Set by Three-State Input fOSC = 96MHz, 48MHz and 24MHz,
±1.0% at V+= 3V and ±1.5% Typical at V+= 5V
LTC6905-80, DC2073B-G Three Fixed Frequencies Set by Three-State Input fOSC = 80MHz, 40MHz and 20MHz,
±1.0% at V+= 3V and ±1.5% typical at V+= 5V
LTC6906, DC2073B-H Resistor Programmable 10kHz ≤ fOSC ≤ 1MHz, ±0.5% at V+= 2.7V to 3.6V
and ±0.7% at V+= 2.25V
LTC6907, DC2073B-I Resistor Programmable 400kHz ≤ fOSC ≤ 4MHz, ±0.65% at V+= 3V to 3.6V
LTC6908-1, DC2073B-J Spread Spectrum Modulation, Complementary
Outputs (0°/180°) Resistor Programmable
250kHz ≤ fOSC ≤ 5MHz, ±1.5% at V+= 2.7V and
±2.0% at V+= 5V
LTC6908-2, DC2073B-K Spread Spectrum Modulation, Quadrature
Outputs (0°/90°) Resistor Programmable
250kHz ≤ fOSC ≤ 5MHz, ±1.5% at V+= 2.7V and
±2.0% at V+= 5V
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dc2073bfa
DEMO MANUAL DC2073B
QUICK START PROCEDURE
Test Equipment:
1. A single 3V power supply.
2. An oscilloscope with a bandwidth of at least 5x fOSC.
(For example, if fOSC = 100MHz then use a 500MHz
oscilloscope).
3. A screwdriver to adjust the potentiometer.
Note:The DC2073B potentiometer is shorted with a
zero ohm resistor for factory testing. The zero ohm
(RJ10) resistor must be removed to allow setting the
frequency with a screwdriver. If the potentiometer is
set to a high value (>100k), then touching the DC2073B
can produce output jitter.
Basic Test Procedure:
1. Connectpower supply to V+and GND, turrets E4 andE5.
2. Connect oscilloscope probe to OUT1 and GND.
Note: The ground lead of an oscilloscope probe has a
series inductance that can generate a resonant circuit
with the probe's capacitance. Probe resonance adds
transient peaks and ringing on a high speed wave-
form. Reliable probing of the high frequency LTC6905
and LTC6905-XXX (with corresponding demo boards
DC2073B-A, -D, -E, -F or -G), must use a very short
connectionofthe
oscilloscopeprobegroundtotheboard
GND (see probe tip picture in Figure1 Test Setup).
3. Set the JP1 jumper to the N divider position for the
desired frequency shown on Table2.
4. Turn on supply.
5. The oscilloscope display shows a 3V squarewave
(0V to 3V).
6. For the resistor-set ICs (DC2073B-A, -B, -C, -H, -I, -J
or -K) turn the RPOT potentiometer for the desired fre-
quency.(The frequency adjustment is very coarse when
the potentiometer is turned near the fully clockwise or
counter-clockwise position).
Verify Oscillator Accuracy
The fOSC accuracy of the resistor-set ICs (DC2073B-A, -B,
-C, -H, -I, -J or -K), can be verified by setting RSET to the
exact value from the fOSC equation shown in Table 2. For
the DC2073B-A, -B, -C, -J, -K, RSET = RPOT + RSET2.
RSET1 and RSET2 are never installed on the same board.
Connecting an ohmmeter across RPOT and RSET1 or
RSET2 forces current into the IC set pin (Pin 3 or 4) and
causes an error in the ohmmeter reading. The RS resistor
is in series with RPOT and equal to RSET1 or RSET2 and
the equivalent RSET = RPOT + RS.
Procedure to Verify Oscillator Accuracy
a. Calculate RSET for the desired frequency (RSET in Table 2).
b. Removethepower supply leadsfrom DC2073B and con-
nect an ohmmeter from POT (E6) to V+(DC2073B-A,
-B, -C, -J or -K) or GND (DC2073B-H or-I).
C. Adjust RPOT for the exact value of RSET needed.
Note: If the potentiometer is turned near the fully clock-
wiseorcounter-clockwisepositiontheRPOTadjustment
may be too coarse for setting an exact RSET value. In
addition, for a frequency adjustment near the upper or
lower fOSC range, RSET may be greater or less than the
default DC2073B RPOT + RSET1 or RSET2 value, in this
case the RSET1 or RSET2 resistor must be removed
and replaced with a lower or higher value.
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dc2073bfa
DEMO MANUAL DC2073B
QUICK START PROCEDURE
Table 2. fOSC Frequency and N Divider Setting
LTC6905, DC2073B-A
fOSC =168.5MHz •10kΩ
RSET
+1.5MHZ
•1
N, RSET =168.5MHz •10kΩ
N• fOSC –1.5MHz
N = 1 (JP1 to V+), 68.9MHz ≤ fOSC ≤ 170MHz
N = 2 (JP1 to OPEN), 34.45MHz ≤ fOSC ≤ 85MHz
N = 4 (JP1 to GND), 7.225MHz ≤ fOSC ≤ 42.5MHz
LTC1799, DC2073B-B
fOSC =
10MHz
N•
10kΩ
RSET
, RSET =
10MHz
fOSC
•
10kΩ
N
N = 1 (JP1 to GND), 500kHz ≤ fOSC ≤ 20MHz
N = 10 (JP1 to OPEN), 50kHz ≤ fOSC ≤ 2MHz
N = 100 (JP1 to V+), 5kHz ≤ fOSC ≤ 200kHz
LTC6900, DC1073A-C
fOSC =
10MHz
N•
20kΩ
R
SET
, RSET =
10MHz
f
OSC
•
20kΩ
N
N = 1 (JP1 to GND), 500kHz ≤ fOSC ≤ 20MHz
N = 10 (JP1 to OPEN), 50kHz ≤ fOSC ≤ 2MHz
N = 100 (JP1 to V+), 5kHz ≤ fOSC ≤ 200kHz
LTC6905-133, DC2073B-D
fOSC =
133MHz
N
N = 1 (JP1 to V+), fOSC = 133MHz
N = 2 (JP1 to OPEN), fOSC = 66.7MHz
N = 4 (JP1 to GND), fOSC = 33.5MHz
LTC6905-10, DC2073B-E
fOSC =
100MHz
N
N = 1 (JP1 to V+), fOSC = 100MHz
N = 2 (JP1 to OPEN), fOSC = 50MHz
N = 4 (JP1 to GND), fOSC = 25MHz
LTC6905-96, DC2073B-F
fOSC =
96MHz
N
N = 1 (JP1 to V+), fOSC = 96MHz
N = 2 (JP1 to OPEN), fOSC = 48MHz
N = 4 (JP1 to GND), fOSC = 24MHz
LTC6905-80, DC2073B-G
fOSC =
80MHz
N
N = 1 (JP1 to V+), fOSC = 80MHz
N = 2 (JP1 to OPEN), fOSC = 40MHz
N = 4 (JP1 to GND), fOSC = 20MHz
LTC6906, DC2073B-H
fOSC =
1MHz
N•
100kΩ
RSET
, RSET =
1MHz
fOSC
•
100kΩ
N
N = 1 (JP1 to GND), 0.1MHz ≤ fOSC ≤ 1MHz
N = 3 (JP1 to OPEN), 33kHz ≤ fOSC ≤ 333kHz
N = 10 (JP1 to V+), 10kHz ≤ fOSC ≤ 100kHz
LTC6907, DC2073B-I
fOSC =
4MHz
N•
50kΩ
R
SET
, RSET =
4MHz
f
OSC
•
50kΩ
N
N = 1 (JP1 to GND), 0.4MHz ≤ fOSC ≤ 4MHz
N = 3 (JP1 to OPEN), 133kHz ≤ fOSC ≤ 1.33MHz
N = 10 (JP1 to V+), 40kHz ≤ fOSC ≤ 400kHz
LTC6908-1, DC2073B-J
Complementary Outputs (0°/180°) without Modulation:
250kHz ≤ fOSC ≤ 5MHz, (JP1 to DIV/MOD)
fOSC =
10MHz
N•
10kΩ
RSET
, RSET =
10MHz
fOSC
•
10kΩ
N
Spread Spectrum Modulation Rate:
(JP1 to GND), fOSC/16
(JP1 to OPEN), fOSC/32
(JP1 to V+), fOSC/64
LTC6908-1, DC2073B-K
Quadrature Outputs (0˚/90˚) without Modulation:
250kHz ≤ fOSC ≤ 5MHz, (JP1 to DIV/MOD)
fOSC =
10MHz
N•
10kΩ
R
SET
, RSET =
10MHz
f
OSC
•
10kΩ
N
Spread Spectrum Modulation Rate:
(JP1 to GND), fOSC/16
(JP1 to OPEN), fOSC/32
(JP1 to V+), fOSC/64
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dc2073bfa
DEMO MANUAL DC2073B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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dc2073bfa
DEMO MANUAL DC2073B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0616 Rev A • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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