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參數(shù)資料
| 型號(hào)： | LTC1569IS8-6#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 0K |
| 描述： | IC FILTER 10TH ORDR LOWPASS8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 濾波器類型： | 線性相位，低通開(kāi)關(guān)電容器 |
| 頻率 - 截止或中心： | 300kHz |
| 濾波器數(shù)： | 1 |
| 濾波器階數(shù)： | 10th |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
6
LTC1569-6
BLOCK DIAGRA
W
10TH ORDER
LINEAR PHASE
FILTER NETWORK
POWER
CONTROL
DIVIDER/
BUFFER
REXT
PRECISION
OSCILLATOR
5
6
7
8
4
3
2
1
OUT
V+
RX
DIV/CLK
IN+
IN–
GND
V–
1569-6 BD
APPLICATIONS INFORMATION
WU
U
Self-Clocking Operation
The LTC1569-6 features a unique internal oscillator which
sets the filter cutoff frequency using a single external
resistor. The design is optimized for VS = 3V, fCUTOFF =
64kHz, where the filter cutoff frequency error is typically
<1% when a 0.1% external 10k resistor is used. With
different resistor values and internal divider settings, the
cutoff frequency can be accurately varied from 1kHz to
64kHz. As shown in Figure 1, the divider is controlled by
the DIV/CLK (Pin 5). Table 1 summarizes the cutoff
frequency vs external resistor values for the divide-by-1
mode.
LTC1569-6
18
27
36
45
DIVIDE-BY-4
DIVIDE-BY-1
DIVIDE-BY-16
V+
V–
REXT
100pF
fCUTOFF =
64kHz (10k/REXT)
1, 4 OR 16
1569-6 F01
IN+
IN–
GND
V–
OUT
V+
RX
DIV/CLK
Figure 1
Table1. fCUTOFF vs REXT, VS = 3V, TA = 25°C, Divide-by-1 Mode
REXT
Typical fCUTOFF
Typical Variation of fCUTOFF
3844
*
N/A
±3.0%
5010
*
N/A
±2.5%
10k
64kHz
±1%
20.18k
32kHz
±2.0%
40.2k
16kHz
±3.5%
*REXT values less than 10k can be used only in the divide-by-16 mode.
In the divide-by-4 and divide-by-16 modes, the cutoff
frequencies in Table 1 will be lowered by 4 and 16
respectively. When the LTC1569-6 is in the divide-by-4
and divide-by-16 modes the power is automatically re-
duced. This results in up to a 40% power savings.
The power reduction in the divide-by-4 and divide-by-16
modes, however, effects the fundamental oscillator fre-
quency. Hence, the effective divide ratio will be slightly
different from 4:1 or 16:1 depending on VS, TA and REXT.
Typically this error is less than 1% (Figures 4 and 6).
The cutoff frequency is easily estimated from the equation
in Figure 1. Examples 1 and 2 illustrate how to use the
graphs in Figures 2 through 7 to get a more precise
estimate of the cutoff frequency.
Example 1: LTC1569-6, REXT = 20k, VS = 3V, divide-by-16
mode, DIV/CLK (Pin 5) connected to V + (Pin 7), TA = 25°C.
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