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參數(shù)資料
| 型號(hào)： | LTC1340CMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | Low Noise, Voltage-Boosted Varactor Driver |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 240K |
| 代理商： | LTC1340CMS8 |
1
LTC1340
Low Noise, Voltage-Boosted
Varactor Driver
FREQUENCY (120kHz/DIV)
0dB
R
1340 TA02
900MHz
V
CC
= 3V
C
OUT
= 270pF
Spectral Plot of VCO Output Driven by LTC1340
Resolution Bandwidth = 300Hz
DESCRIPTIO
N
U
The LTC
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
μ
V
RMS
,
minimizing frequency deviation in PLL frequency synthe-
sizer
systems. Supply current is 400
μ
A typically with a 3V
supply, and drops to 1
μ
A 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
μ
A, 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.
FEATURES
TYPICAL APPLICATIO
N
U
Low Voltage Frequency Synthesizer
LTC1340
PGND
CP
VCO
AV
CC
A
V
= 2.3
V
CC
0V TO 5V
IN
1
8
7
6
2
3
4
5
3V
1340 TA01
OUT
LOOP
FILTER
SHDN
SHUTDOWN
AGND
270pF
0.1
μ
F
0.1
μ
F
PHASE
DETECTOR
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
Generates 5V Varactor Drive from a 3V Supply
I
Wide Supply Voltage Range: 2.7V to 6V
I
Requires Only Three External Components
I
Micropower Operation: 400
μ
A at 3V Supply
I
Shutdown Mode Drops Supply Current Below 1
μ
A
I
Low Output Noise: 15
μ
V
RMS
I
Amplifier Gain: 2.3
I
Up to 500kHz Signal Bandwidth
I
MS8 and SO-8 Packages
I
Very Low Input Bias Current: 10nA Max
I
Amplifier Offset Maintains Phase Detector
in Linear Region
APPLICATIO
S
U
I
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
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