參數(shù)資料
型號(hào): LTC1565-31
廠商: Linear Technology Corporation
英文描述: 650kHz Continuous Time, Linear Phase Lowpass Filter
中文描述: 650kHz的連續(xù)時(shí)間,線性相位低通濾波器
文件頁(yè)數(shù): 6/8頁(yè)
文件大?。?/td> 136K
代理商: LTC1565-31
6
LTC1565-31
APPLICATIO
S I
FOR
ATIO
U
W
U
U
input voltages are Pin 1 = 2.5V DC
±
0.5V and Pin 2 = 2.5V
DC
±
0.5V. Also note Figure 5 shows a 78dB SNR ratio for
higher THD levels.
As seen in Figures 3 and 4, the spurious free dynamic
range can be optimized by setting the input common mode
voltage slightly below one-half of the power supply volt-
age, i.e., 2V for a single 5V supply and –0.5V to –1V for a
±
5V supply. Figure 6 shows the THD and SNR ratio versus
differential input voltage level for both a single 5V supply
and a
±
5V supply when the common mode input voltage
is 2V and –0.5V respectively.
For best performance, the inputs should be driven differ-
entially. For single-ended signals, connect the unused
input to Pin 3 or a common mode reference.
DIFFERENTIAL INPUT (
P-P
)
0.5
–90
T
–80
–70
–60
–50
–30
1.0
1.5
2.0
2.5
1565-31 F05
3.0
3.5
–40
THD: V
S
= 5V
THD: V
S
=
±
5V
SNR
f
IN
= 100kHz
Figure 5. Dynamic Range Diff-In, Diff-Out
DIFFERENTIAL INPUT VOLTAGE (V
P-P
)
0.5
–90
T
–80
–70
–60
–50
–40
1.0
1.5
2.0
2.5
1565-31 F06
3.0
3.5
THD: V
S
= 5V
THD: V
S
=
±
5V
SNR
f
IN
= 100kHz
Figure 6. THD vs V
IN
for a Common Mode
Input Voltage 0.5V Below Mid Supply
Output Common Mode and Differential Voltage Range
The output is a fully differential signal with a common mode
level equal to the voltage at Pin 3. The specifications in the
Electrical Characteristics table assume the inputs are driven
differentially and the output is observed differentially.
However, Pin 8 can be used as a single-ended output by
simply floating Pin 7. Pin 7 can be used as an inverting
single-ended output by floating Pin 8. Using Pins 7 or 8 as
single-ended outputs will decrease the performance.
The common mode output voltage can be adjusted by
overdriving the voltage present on Pin 3. The best perfor-
mance is achieved using a common mode output voltage
that is equal to mid supply (the default Pin 3 voltage). Fig-
ures 7 and 8 illustrate the THD versus output common mode
voltage for a 2V
P-P
differential input voltage and a common
mode input voltage that is 0.5V below mid supply.
COMMON MODE OUTPUT VOLTAGE (V)
1.5
T
–50
–40
–30
3.0
4.0
1565-31 F07
–60
–70
–80
2.0
2.5
3.5
–20
–10
0
V
IN
= 2V
P-P
100kHz
V
S
= 5V
V
IN(CM)
= 2V
COMMON MODE OUTPUT VOLTAGE (V)
–4
T
–50
–40
–30
4
1565-31 F08
–60
–70
–90
–80
–2
0
2
–20
–10
0
V
IN
= 2V
P-P
100kHz
V
S
=
±
5V
V
IN(CM)
= –0.5V
Figure 7. THD vs Common Mode Output Voltage
Figure 8. THD vs Common Mode Output Voltage
相關(guān)PDF資料
PDF描述
LTC1565-31IS8 650kHz Continuous Time, Linear Phase Lowpass Filter
LTC1569-6 Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter
LTC1569IS8-7 Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter
LTC1569C Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter
LTC1569CS8-6 Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter
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