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AD8028ARMZ 데이터 시트보기 (PDF) - Analog Devices

부품명AD8028ARMZ ADI
Analog Devices ADI
상세내역Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers


AD8028ARMZ Datasheet PDF : 24 Pages
First Prev 21 22 23 24
AD8027/AD8028
BAND-PASS FILTER
In communication systems, active filters are used extensively in
signal processing. The AD8027/AD8028 are excellent choices
for active filter applications. In realizing this filter, it is impor-
tant that the amplifier have a large signal bandwidth of at least
10× the center frequency, fO. Otherwise, a phase shift can occur
in the amplifier, causing instability and oscillations.
In Figure 62, the AD8027/AD8028 part is configured as a
1 MHz band-pass filter. The target specifications are fO = 1 MHz
and a −3 dB pass band of 500 kHz. To start the design, select fO,
Q, C1, and R4. Then use the following equations to calculate the
remaining variables:
Q = fO (MHz)
Band Pass (MHz)
k = 2πfOC1
C2 = 0.5C1
R1 = 2/k, R2 = 2/(3k), R3 = 4/k
H = 1/3(6.5 – 1/Q)
R5 = R4/(H – 1)
R2
105Ω
R1
316Ω
VIN
C1
1000pF
C2
R3
500pF 634Ω
+5
C3
0.1μF
+
AD8027/
AD8028
SELECT
VOUT
R5
523Ω
C4
–5 0.1μF
R4
523Ω
Figure 62. Band-Pass Filter Schematic
03327-A-061
The test data shown in Figure 63 indicates that this design
yields a filter response with a center frequency of fO = 1 MHz,
and a bandwidth of 450 kHz.
CH1 S21 LOG
5dB/REF 6.342dB 1:6.3348dB 1.00 000MHz
1
0.1
1
10
FREQUENCY – MHz
03327-A-062
Figure 63. Band-Pass Filter Response
DESIGN TOOLS AND TECHNICAL SUPPORT
Analog Devices, Inc. (ADI) is committed to simplifying the
design process by providing technical support and online
design tools. ADI offers technical support via free evaluation
boards, sample ICs, interactive evaluation tools, data sheets,
spice models, application notes, and phone and email support
available at www. analog.com.
Rev. C | Page 22 of 24
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GENERAL DESCRIPTION
The AD8027/AD80281 are high speed amplifiers with rail-to-rail input and output that operate on low supply voltages and are optimized for high performance and wide dynamic signal range. The AD8027/AD8028 have low noise (4.3 nV/√Hz, 1.6 pA/√Hz) and low distortion (120 dBc at 1 MHz). In applications that use a fraction of, or the entire input dynamic range and require low distortion, the AD8027/AD8028 are ideal choices.

FEATURES
High speed
  190 MHz, –3 dB bandwidth (G = +1)
  100 V/μs slew rate
Low distortion
  120 dBc @ 1 MHz SFDR
  80 dBc @ 5 MHz SFDR
Selectable input crossover threshold
Low noise
  4.3 nV/√Hz
  1.6 pA/√Hz
Low offset voltage: 900 μV max
Low power: 6.5 mA/amplifier supply current
Power-down mode
No phase reversal: VIN > |VS| + 200 mV
Wide supply range: 2.7 V to 12 V
Small packaging: SOIC-8, SOT-23-6, MSOP-10

APPLICATIONS
Filters
ADC drivers
Level shifting
Buffering
Professional video
Low voltage instrumentation

 

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