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PDF LTC6907 Data sheet ( Hoja de datos )
| Número de pieza | LTC6907 | |
| Descripción | Micropower | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Supply Current: 36µA at 400kHz
■ 1% Frequency Accuracy (from 0°C to 70°C)
■ Frequency Range: 40kHz to 4MHz
■ One Resistor Sets the Oscillator Frequency
■ –40°C to 125°C Operating Temperature Range
■ Start-Up Time Under 200µs at 4MHz
■ First Cycle After Power-Up is Accurate
■ 150Ω CMOS Output Driver
■ Low Profile (1mm) SOT-23 (ThinSOTTM) Package
U
APPLICATIO S
■ Low Cost Precision Programmable Oscillator
■ Rugged, Compact Micropower Replacement for
Crystal and Ceramic Oscillators
■ High Shock and Vibration Environments
■ Portable and Battery-Powered Equipment
■ PDAs and Cellular Phones
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC6907
Micropower, 40kHz to 4MHz
Resistor Set Oscillator
in SOT-23
DESCRIPTIO
The LTC®6907 is a precision programmable oscillator that
is versatile, compact and easy to use. Micropower opera-
tion benefits portable and battery-powered equipment. At
400kHz, the LTC6907 consumes 36µA on a 3V supply.
A single resistor programs the oscillator frequency over a
10:1 range with better than 0.65% initial accuracy. The
output frequency can be divided by 1, 3 or 10 to span a
100:1 total frequency range, 40kHz to 4MHz.
The LTC6907 is easily programmed according to this
simple formula:
⎧10, DIV Pin = V +
ƒOUT
=
4MHz
N
•
⎛
⎝⎜
50k
RSET
⎞
⎠⎟
,
N = ⎨⎪3,
⎩⎪1,
DIV Pin = Open
DIV Pin = GND
The LTC6907 is available in the 6-lead SOT-23 (ThinSOT)
package.
Contact LTC Marketing for a version of the part with a
shutdown feature or lower frequency operation.
TYPICAL APPLICATIO
Micropower Clock Generator
3V TO 3.6V
0.1µF
÷10
÷3
÷1
LTC6907 40kHz TO 4MHz
V+ OUT
GND GRD
DIV SET
RSET
50k TO 500k
6907 TA01
Typical Supply Current vs Frequency
1000
CLOAD = 5pF
T = 25°C
3.3V, –: 1
3.3V, –: 3
3.3V, –: 10
100
10
10
100 1000
OUTPUT FREQUENCY (kHz)
10000
6907 TA02
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LTC6907
PI FU CTIO S
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, deter-
mining 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 LTC6907 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 0.1% or better tolerance and 50ppm/°C
or better temperature coefficient. For lower accuracy
applications, 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. The
voltage on the SET pin is approximately 650mV at 25°C
and decreases with temperature by about –2.3mV/°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. Careful attention to
board layout and assembly can prevent leakage currents.
The use of a guard ring provides additional shielding of
leakage currents from the SET pin and is optional. If
unused, the GRD pin should be left unconnected.
V+ (Pin 6): Voltage Supply (3V to 3.6V). A 0.1µF
decoupling capacitor should be placed as close as pos-
sible to this pin for best performance.
BLOCK DIAGRA
V+
6
GND
2
FREQUENCY-TO-CURRENT
CONVERTERS
fOSC
IFB IFB
VSET ≅ VGRD ≅ 650mV
ISET = IFB
VSET
SET
4
VSET
RSET
BUFFER
GRD
5
VSET
–
OP AMP
+
VOLTAGE
CONTROLLED
OSCILLATOR
(MASTER OSCILLATOR)
fOSC
fOSC = 4MHz •
50kΩ
RSET
V+
THREE-LEVEL
INPUT
DETECTOR
5M
DIV
3
5M
DIVIDER
SELECT
150Ω DRIVER
PROGRAMMABLE
DIVIDER (n)
(÷1, ÷3, ÷10)
OUT 1
6907 BD
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PACKAGE DESCRIPTIO
S6 Package
6-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1636)
0.62 0.95
MAX REF
1.22 REF
2.90 BSC
(NOTE 4)
3.85 MAX 2.62 REF
1.4 MIN
2.80 BSC 1.50 – 1.75
(NOTE 4)
PIN ONE ID
LTC6907
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
0.20 BSC
DATUM ‘A’
0.95 BSC
0.80 – 0.90
1.00 MAX
0.30 – 0.50 REF
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
0.09 – 0.20
(NOTE 3)
1.90 BSC
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
0.30 – 0.45
6 PLCS (NOTE 3)
0.01 – 0.10
S6 TSOT-23 0302
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC6907.PDF ] | |
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