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LT1568CGNPBF 参数 Datasheet PDF下载

LT1568CGNPBF图片预览
型号: LT1568CGNPBF
PDF下载: 下载PDF文件 查看货源
内容描述: 极低噪声,高频有源RC ,滤波器积木 [Very Low Noise, High Frequency Active RC, Filter Building Block]
分类和应用:
文件页数/大小: 16 页 / 282 K
品牌: LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
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FEATURES
s
s
LT1568
Very Low Noise,
High Frequency Active RC,
Filter Building Block
DESCRIPTIO
The LT
®
1568 is an easy-to-use, active-RC filter building
block with rail-to-rail inputs and outputs. The internal ca-
pacitors of the IC and the GBW product of the internal low
noise op amps are trimmed such that consistent and repeat-
able filter responses can be achieved. With a single resis-
tor value, the LT1568 provides a pair of
matched
2-pole
Butterworth lowpass filters with unity gain suitable for I/Q
channels.
By using unequal-valued external resistors, the two 2-pole
sections can create different frequency responses or
gains. In addition, the two stages may be cascaded to
create a single 4-pole filter with a programmable re-
sponse. Capable of cutoff frequencies up to 10MHz, the
LT1568 is ideal for antialiasing or channel filtering in high
speed data communications systems. The LT1568 can
also be used as a bandpass filter.
The LT1568 features very low noise, supporting signal-to-
noise ratios of over 90dB. It also provides single-ended to
differential signal conversion for directly driving high
speed A/D converters. The LT1568 has a shutdown mode
that reduces supply current to approximately 0.5mA on a
5V supply.
The LT1568 is available in a narrow 16-lead SSOP
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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s
s
s
s
s
s
s
s
Up to 10MHz Center Frequency on a Single 3V
Supply
Easy to Use—A Single Resistor Value Sets Lowpass
Cutoff Frequency (200kHz
≤ ƒ
C
5MHz), Unequal
Resistor Values Extend Cutoff Frequency Up to
10MHz
Extremely Flexible—Different Resistor Values
Allow Lowpass Transfer Functions with or Without
Gain (Butterworth, Chebyshev or Custom)
SNR = 92dB (ƒ
C
= 2MHz, 2V
P-P
)
THD = –84dB (ƒ
C
= 2MHz, 1V
P-P
)
Internal Capacitors Trimmed to
±0.75%
Single 4-Pole Lowpass Filter or
Matched Pair
of
2-Pole Lowpass Filters
Can be Connected as a Bandpass Filter
Single-Ended or Differential Output
Operates from Single 3V (2.7V Min) to
±5V
Supply
Rail-to-Rail Input and Output Voltages
APPLICATIO S
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Replaces Discrete RC Active Filters and LC Filter
Modules
Antialiasing/Reconstruction Filters
Dual or I-and-Q Channels (Two Matched 2nd Order
Filters in One Package)
Single-Ended to Differential Conversion
Video Signal Processing
TYPICAL APPLICATIO
3V
0.1µF
1
511Ω
V
INA
V
OUTA
V
OUTA
511Ω
511Ω
2
3
4
5
6
0.1µF 7
8
Amplitude and Phase Matched Dual Butterworth 2.5MHz Lowpass
Filter with Differential Output. Single 3V Supply Operation
16
V
+
LT1568
15
INVA
INVB
14
SA
SB
13
OUTA
OUTB
12
OUTA
OUTB
11
GNDA GNDB
10
NC
EN
9
V
V
V
+
Amplitude Response
3
0
–3
511Ω
511Ω
GAIN (dB)
–6
V
INB
V
OUTB
511Ω
V
OUTB
THE PROPRIETARY ARCHITECTURE
ALLOWS FOR A SIMPLE RESISTOR
CALCULATION:
10MHz
R = 128Ω •
;
ƒ
C
= CUTOFF FREQUENCY
ƒ
C
–9
–12
–15
–18
–21
–24
–27
100k
1M
FREQUENCY (Hz)
10M
1568 TA02
1568 TA01
U
U
U
1568f
1