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參數(shù)資料
| 型號(hào)： | LTC1569CS8-6 |
| 廠(chǎng)商： | Linear Technology |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大小： | 0K |
| 描述： | IC FILTER 10TH ORDR LOWPASS8SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 濾波器類(lèi)型： | 線(xiàn)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(lèi)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： | 管件 |
8
LTC1569-6
APPLICATIONS INFORMATION
WU
U
Figure 6. Typical Divide Ratio in the
Divide-by-16 Mode, TA = 25°C
Figure 7. Filter Cutoff vs Temperature,
Divide-by-16 Mode, REXT = 10k
TEMPERATURE (
°C)
–50
NORMALIZED
FILTER
CUTOFF
1569-6 F07
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
–25
0
25
50
75
100
VS = 3V
VS = 5V
VS = 10V
VSUPPLY (V)
2
DIVIDE
RATIO
1569-6 F06
16.32
16.16
16.00
15.84
4
6
810
REXT = 5k
REXT = 10k
REXT = 20k
REXT = 40k
a ground plane connected to V – (Pin 4) for single supply
applications. Connect a ground plane to GND (Pin 3) for
dual supply applications and connect V – (Pin 4) to a
copper trace with low thermal resistance.
Input and Output Voltage Range
The input signal range includes the full power supply
range. The output range is typically (V– + 50mV) to (V+ –
0.8V) when using a single 3V supply with the GND (Pin 3)
voltage set to 1.11V. In other words, the output range is
typically 2.1VP-P for a 3V supply. Similarly, the output
range is typically 3.9VP-P for a single 5V supply when the
GND (Pin 3) voltage is 2V. For
±5V supplies, the output
range is typically 8.5VP-P.
The LTC1569-6 can be driven with a single-ended or
differential signal. When driven differentially, the voltage
between IN + and IN – (Pin 1 and Pin 2) is filtered with a DC
gain of 1. The single-ended output voltage OUT (Pin 8) is
referenced to the voltage of the GND (Pin 3). The common
mode voltage of IN + and IN – can be any voltage that keeps
the input signals within the power supply range.
For noninverting single-ended applications, connect IN –
to GND or to a quiet DC reference voltage and apply the
input signal to IN +. If the input is DC coupled then the DC
gain from IN + to OUT will be 1. This is true given IN + and
OUT are referenced to the same voltage, i.e., GND, V – or
some other DC reference. To achieve the distortion levels
shown in the Typical Performance Characteristics the
input signal at IN + should be centered around the DC
voltage at IN –. The input can also be AC coupled, as shown
in the Typical Applications section.
For inverting single-ended filtering, connect IN+ to GND or
to quiet DC reference voltage. Apply the signal to IN –. The
DC gain from IN – to OUT is –1, assuming IN – is referenced
to IN + and OUT is reference to GND.
Refer to the Typical Performance Characteristics section
to estimate the THD for a given input level.
Dynamic Input Impedance
The unique input sampling structure of the LTC1569-6 has
a dynamic input impedance which depends on the con-
figuration, i.e., differential or single-ended, and the clock
frequency. The equivalent circuit in Figure 8 illustrates the
input impedance when the cutoff frequency is 64kHz. For
other cutoff frequencies replace the 125k value with
125k (64kHz/fCUTOFF).
When driven with a single-ended signal into IN – with IN +
tied to GND, the input impedance is very high (~10M
).
When driven with a single-ended signal into IN + with IN –
tied to GND, the input impedance is a 125k resistor to GND.
When driven with a complementary signal whose com-
mon mode voltage is GND, the IN+ input appears to have
125k to GND and the IN – input appears to have –125k to
GND. To make the effective IN – impedance 125k when
driven differentially, place a 62.5k resistor from IN – to
GND. For other cutoff frequencies use 62.5k (64kHz/
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