LTC1340CMS8 Linear Technology, LTC1340CMS8 Datasheet

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LTC1340CMS8

Manufacturer Part Number
LTC1340CMS8
Description
IC VARACTOR DVR LOW NOISE 8-MSOP
Manufacturer
Linear Technology
Type
Driverr
Datasheet

Specifications of LTC1340CMS8

Number Of Drivers/receivers
1/0
Voltage - Supply
2.7 V ~ 6 V
Mounting Type
Surface Mount
Package / Case
*
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Protocol
-

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1340CMS8
Manufacturer:
LT
Quantity:
10 000
APPLICATIONS
FEATURES
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TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
Contact Linear Technology for Potential Replacement
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
Generates 5V Varactor Drive from a 3V Supply
Wide Supply Voltage Range: 2.7V to 6V
Requires Only Three External Components
Micropower Operation: 400µA at 3V Supply
Shutdown Mode Drops Supply Current Below 1µA
Low Output Noise: 15
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
DETECTOR
PHASE
FOR INFORMATION PURPOSES ONLY
APPLICATION
0.1µF
OBSOLETE:
Low Voltage Frequency Synthesizer
U
LOOP
FILTER
µ
5
SHUTDOWN
V
IN
SHDN
RMS
V
3V
CC
3
2
LTC1340
PGND
CP
U
1
4
A
V
AGND
AV
= 2.3
OUT
CC
6
8
7
0V TO 5V
270pF
0.1µF
VCO
1340 TA01
Low Noise, Voltage-Boosted
DESCRIPTION
The LTC
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 15µV
minimizing frequency deviation in PLL frequency synthe-
sizer systems. Supply current is 400µA typically with a 3V
supply, and drops to 1µA 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 20µA, 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.
®
1340 is a varactor diode driver designed to generate
Spectral Plot of VCO Output Driven by LTC1340
0dB
U
Resolution Bandwidth = 300Hz
V
C
CC
OUT
= 3V
= 270pF
Varactor Driver
FREQUENCY (120kHz/DIV)
900MHz
LTC1340
1340 TA02
RMS
1
,

Related parts for LTC1340CMS8

LTC1340CMS8 Summary of contents

Page 1

... U 5V Varactor Drive from a Single Li-Ion Cell I 5V Varactor Drive from Three NiCd/NiMH Cells I Cellular Telephones I Portable RF Equipment I Radio Modems I Wireless Data Transmission I , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION U Low Voltage Frequency Synthesizer 3V 2 0.1µ LTC1340 5 ...

Page 2

... Commercial Temperature Range ................. Extended Commercial Operating + 0.3V Temperature Range (Note 1) ............. – 0.3V Storage Temperature Range ................. – 150 C CC Lead Temperature (Soldering, 10 sec.)................. 300 ORDER PART NUMBER LTC1340CMS8 SHDN 3 PGND 4 S8 PACKAGE LTBM 8-LEAD PLASTIC 125 C, JMAX unless otherwise noted. (Note 1) A CONDITIONS 2. ...

Page 3

ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER t Charge Pump Start-Up Time START V Charge Pump Output Ripple at C RIPPLE P f Charge Pump Frequency CP The denotes specifications which apply over the specified temperature range. Note 1: C grade device specifications ...

Page 4

LTC1340 W U TYPICAL PERFORMANCE CHARACTERISTICS Transconductance vs Temperature 3000 V = 1/2AV OUT CC 2800 SHDN CC 2600 2400 2200 2000 1800 1600 V = 2.7V CC 1400 ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS Charge Pump Frequency vs Temperature 4 SHDN 2.7V CC 3.4 3.2 3.0 –50 – 100 ...

Page 6

LTC1340 W BLOCK DIAGRAM C CP 0.1 F (EXTERNAL) PGND V CC 0.1 F SHDN U U APPLICATIONS INFORMATION Overview The LTC1340 is a monolithic IC that combines a charge pump and a low noise amplifier to provide a 0V ...

Page 7

... Figure 1. Suggested Surface Mount PCB Layout for LTC1340CS8 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. ...

Page 8

... LTC1340 U U APPLICATIONS INFORMATION 0.1 F Figure 2. Suggested Surface Mount PCB Layout for LTC1340CMS8 PACKAGE DESCRIPTION 0.007 0 – 6 TYP (0.18) 0.021 0.004 (0.53 0.01) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" ...

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