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| 型号： | LTC1565-31IS8#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC FILTR 7TH ORDER 650KHZ 8-SOIC |
| 标准包装： | 2,500 |
| 滤波器类型： | 线性相位，连续时间低通 |
| 频率 - 截止或中心： | 650kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 7th |
| 电源电压： | 4.75 V ~ 11 V，±4.75 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1565-31IS8TR |
LTC1565-31
7
156531fa
APPLICATIONS INFORMATION
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 voltage,
i.e., 2V for a single 5V supply and –0.5V 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 dif-
ferentially. For single-ended signals, connect the unused
input to Pin 3 or a common mode reference.
DIFFERENTIAL INPUT (P-P)
0.5
–90
THD,
SNR
(dB)
–80
–70
–60
–50
–30
1.0
1.5
2.0
2.5
1565-31 F05
3.0
3.5
–40
THD: VS = 5V, VCM = 2.5V
THD: VS = ±5V, VCM = 0V
SNR
fIN = 100kHz
Figure 5. Dynamic Range Diff-In, Diff-Out
DIFFERENTIAL INPUT VOLTAGE (VP-P)
0.5
–90
THD,
SNR
(dB)
–80
–70
–60
–50
–40
–30
1.0
1.5
2.0
2.5
1565-31 F06
3.0
3.5
THD: VS = 5V, VCM = 2V
THD: VS = ±5V, VCM = –0.5V
SNR
fIN = 100kHz
Figure 6. THD vs VIN 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 specications 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 oating Pin 7. Pin 7 can be used as an inverting
single-ended output by oating Pin 8. Using Pins 7 or 8
as single-ended outputs will decrease the performance.
The common mode output voltage can be adjusted by over-
driving the voltage present on Pin 3. The best performance
is achieved using a common mode output voltage that is
equal to mid supply (the default Pin 3 voltage). Figures
7 and 8 illustrate the THD versus output common mode
voltage for a 2VP-P differential input voltage and a common
mode input voltage that is 0.5V below mid supply.
COMMON MODE OUTPUT VOLTAGE (V)
1.5
1.0
THD
(dB)
–50
–40
–30
3.0
4.0
1565-31 F07
–60
–70
–80
2.0
2.5
3.5
–20
–10
0
VIN = 2VP-P 100kHz
VS = 5V
VIN(CM) = 2V
COMMON MODE OUTPUT VOLTAGE (V)
–4
THD
(dB)
–50
–40
–30
4
1565-31 F08
–60
–70
–90
–80
–2
–3
–1
0
2
3
1
–20
–10
0
VIN = 2VP-P 100kHz
VS = ±5V
VIN(CM) = –0.5V
Figure 7. THD vs Common Mode Output Voltage
Figure 8. THD vs Common Mode Output Voltage
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