參數(shù)資料
型號(hào)： LTC1340
廠商： Linear Technology Corporation
英文描述： Low Noise, Voltage-Boosted Varactor Driver(低噪聲，升壓型，變抗器驅(qū)動(dòng)器)
中文描述： 低噪聲，電壓，細(xì)看變?nèi)荻O管驅(qū)動(dòng)器（低噪聲，升壓型，變抗器驅(qū)動(dòng)器）
文件頁(yè)數(shù)： 5/8頁(yè)
文件大?。?/td> 215K
代理商： LTC1340
5
LTC1340
PI
FU
CTIO
N
S
U
U
CP (Pin 1):
Charge Pump Output. This is the output of the
internal charge pump. The voltage at CP is nominally twice
the V
CC
input voltage. Connect CP to an external 0.1
μ
F
filter capacitor and AV
CC
.
V
CC
(Pin 2):
Supply Input. This is the input supply to the
charge pump. V
CC
can range from 2.7V to 6V and requires
a 0.1
μ
F bypass capacitor to PGND.
SHDN (Pin 3)
Shutdown. If SHDN is high (>V
CC
– 0.5V),
the LTC1340 operates normally. If SHDN is pulled low
(<0.5V), the LTC1340 enters shutdown mode and the
supply current drops to less than 1
μ
A typically. In shut-
down, the charge pump output voltage collapses and the
OUT pin enters a high impedance state. If SHDN returns
high, the charge pump output requires 1.2ms typically to
resume full voltage.
PGND (Pin 4):
Power Ground. This is the charge pump
ground. Connect PGND to the system power supply
return.
IN (Pin 5):
Signal Input. The internal amplifier amplifies
the signal input at this pin typically by 2.3 to the OUT pin.
IN accepts signals from GND to V
CC
without phase rever-
sal or unusual behavior, allowing a direct connection to the
output of virtually any phase detector or loop filter pow-
ered from V
CC
.
AGND (Pin 6):
Signal Ground. Connect AGND to the
ground plane in close proximity to the VCO ground. There
is an internal parasitic resistance of 50
between AGND
and PGND.
OUT (Pin 7):
Driver Output. OUT is the output of the
internal g
m
amplifier and the internal feedback network. It
swings from GND to AV
CC
, and drives a varactor load
directly. The OUT pin requires an external capacitor
(
≥
220pF) to AGND to ensure stability. OUT typically sinks
or sources 20
μ
A.
AV
CC
(Pin 8):
Amplifier Supply. LTC recommends a direct
connection from AV
CC
to CP and also recommends a 0.1
μ
F
filter capacitor from CP to PGND.
F
4.0
3.8
3.6
3.4
3.2
3.0
1340 G16
TEMPERATURE (
°
C)
–50
0
–25
25
50
75
100
125
V
SHDN
= V
CC
V
CC
= 6V
V
CC
= 2.7V
V
CC
= 5V
Charge Pump Frequency vs
Temperature
Small-Signal Response
1340 G18
C
OUT
= 220pF
C
OUT
= 470pF
C
OUT
= 1nF
C
OUT
= 0pF
TYPICAL PERFOR
M
A
CE CHARACTERISTICS
U
Large-Signal Response
V
IN
= 0.5V TO 2V
V
CC
= 2.7V
C
OUT
= 1nF
1340 G17
0V
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