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LTC1340CMS8 Datasheet

  • LTC1340CMS8

  • Low Noise, Voltage-Boosted Varactor Driver

  • 8頁

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LTC1340
Low Noise, Voltage-Boosted
Varactor Driver
FEATURES
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DESCRIPTION
The LTC
廬
1340 is a varactor diode driver designed to generate
5V varactor drive from a single 3V or higher voltage supply.
It includes a low noise amplifier with an internal gain of 2.3
and a self-contained charge pump to generate output volt-
ages above the input supply. The amplifier input stage
includes a built-in offset voltage that allows the output voltage
to swing to ground without requiring OV on the input. This
feature maintains the phase detector within its linear range of
operation. The LTC1340 requires only three external surface
mount capacitors to implement a complete varactor driver
module.
The LTC1340 features output referred noise of 15碌V
RMS
,
minimizing frequency deviation in PLL frequency synthe-
sizer systems. Supply current is 400碌A(chǔ) typically with a 3V
supply, and drops to 1碌A(chǔ) in shutdown, maximizing operating
life in battery-powered systems. Amplifier bandwidth is user-
adjustable from 10kHz up to 500kHz and the output typically
sinks or sources 20碌A(chǔ), allowing fast output signal changes
with a typical varactor load. The amplifier input features rail-
to-rail input common mode range, allowing it
to interface with the output of virtually any phase detector
circuit.
The LTC1340 is available in MS8 and SO-8 packages.
Generates 5V Varactor Drive from a 3V Supply
Wide Supply Voltage Range: 2.7V to 6V
Requires Only Three External Components
Micropower Operation: 400碌A(chǔ) at 3V Supply
Shutdown Mode Drops Supply Current Below 1碌A(chǔ)
Low Output Noise: 15
碌
V
RMS
Amplifier Gain: 2.3
Up to 500kHz Signal Bandwidth
MS8 and SO-8 Packages
Very Low Input Bias Current: 10nA Max
Amplifier Offset Maintains Phase Detector
in Linear Region
APPLICATIONS
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5V Varactor Drive from a Single Li-Ion Cell
5V Varactor Drive from Three NiCd/NiMH Cells
Cellular Telephones
Portable RF Equipment
Radio Modems
Wireless Data Transmission
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Low Voltage Frequency Synthesizer
3V
Spectral Plot of VCO Output Driven by LTC1340
Resolution Bandwidth = 300Hz
0dB
V
CC
= 3V
C
OUT
= 270pF
0.1碌F
2
V
CC
1
CP
LTC1340
8
AV
CC
0.1碌F
PHASE
DETECTOR
5 IN
LOOP
FILTER
OUT 7 0V TO 5V
A
V
= 2.3
270pF
VCO
SHDN PGND AGND
4
3
6
1340 TA01
SHUTDOWN
RELATIVE POWER (10dB/DIV)
U
U
U
900MHz
FREQUENCY (120kHz/DIV)
1340 TA02
1

LTC1340CMS8 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • -

  • 管件

  • 停產(chǎn)

  • 驅(qū)動(dòng)器

  • -

  • 1/0

  • -

  • -

  • -

  • 2.7V ~ 6V

  • -

  • 表面貼裝型

  • 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）

  • 8-MSOP

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