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AD8264 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD8264은 전자 산업 및 응용 분야에서
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부품번호 AD8264 기능
기능 DC Coupled VGA And Differential Output Amplifier
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AD8264 데이터시트, 핀배열, 회로
Data Sheet
Quad, 235 MHz, DC-Coupled VGA
and Differential Output Amplifier
AD8264
FEATURES
GENERAL DESCRIPTION
Low noise
Voltage noise: 2.3 nV/√Hz
Current noise: 2 pA/√Hz
Wide bandwidth
Small signal: 235 MHz (VGAx); 80 MHz (output amplifier)
Large signal: 80 MHz (1 V p-p)
Gain range
0 to 24 dB (input to VGA output)
6 to 30 dB (input to differential output)
Gain scaling: 20 dB/V
DC-coupled
Single-ended input and differential output
Supplies: ±2.5 V to ±5 V
Low power: 140 mW per channel at ±3.3 V
APPLICATIONS
Multichannel data acquisition
Positron emission tomography
Gain trim
Industrial and medical ultrasound
Radar receivers
The AD8264 is a quad, linear-in-dB, general-purpose variable
gain amplifier (VGA) with a preamplifier (preamp), and a flexible
differential output buffer. DC coupling, combined with wide
bandwidth, makes this amplifier a very good pulse processor.
Each channel includes a single-ended input preamp/VGA section
to preserve the wide bandwidth and fast slew rate for low dis-
tortion pulse applications. A 6 dB differential output buffer with
common-mode and offset adjustments enable direct coupling to
most modern high speed analog-to-digital converters (ADCs),
using the converter reference output for perfect dc matching levels.
The −3 dB bandwidth of the preamp/VGA is dc to 235 MHz,
and the bandwidth of the differential driver is 80 MHz. The
floating gain control interface provides a precise linear-in-dB scale
of 20 dB/V and is easy to interface to a variety of external circuits.
The gain of each channel is adjusted independently, and all
channels are referenced to a single pin, GNLO. Combined with
a multioutput, digital-to-analog converter (DAC), each section
of the AD8264 can be used for active calibration or as a trim
amplifier.
Operation from a bipolar power supply enables amplification of
negative voltage pulses generated by current-sinking pulses into
a grounded load, such as is typical of photodiodes or photo-
multiplier tubes (PMT). Delay-free processing of wideband
video signals is also possible.
FUNCTIONAL BLOCK DIAGRAM
ONE CHANNEL SHOWN
IPPx
IPNx
VPOS
VNEG
PREAMP
6dB (2×)
OPPx
100
100
BIAS
VGAx
FIXED GAIN VGA
AMPLIFIER
18dB (8×)
+ ATTENUATOR
–24dB TO 0dB
747
DIFFERENTIAL OUTPUT
AMPLIFIER 6dB (2×)
1k2k
INTERPOLATOR
GAIN
INTERFACE
107
2k
1k
VOLx
VOHx
COMM
GNHx GNLO
Figure 1.
VOCM OFSx
Rev. B
Document Feedback
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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2009–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




AD8264 pdf, 반도체, 판매, 대치품
Data Sheet
AD8264
SPECIFICATIONS
VS = ±2.5 V, TA = 25°C, f = 10 MHz, CL = 5 pF, RL = 500 Ω per output (VGAx, VOHx, VOLx), VGAIN = (VGNHx − VGNLO) = 0 V,
VVOCM = GND, VOFSx = GND, gain range = 6 dB to 30 dB, unless otherwise specified.
Table 1.
Parameter
Test Conditions/Comments
Min Typ
GENERAL PERFORMANCE
–3 dB Small Signal Bandwidth (VGAx)
VOUT = 10 mV p-p
235
–3 dB Large Signal Bandwidth (VGAx)
–3 dB Small Signal Bandwidth (Differential Output)1
–3 dB Large Signal Bandwidth (Differential Output)1
VOUT = 1 V p-p
VOUT = 100 mV p-p
VOUT = 2 V p-p
150
80
80
Slew Rate
VGAx, VOUT = 2 V p-p
380
VGAx, VOUT = 1 V p-p
290
Differential output, VOUT = 2 V p-p
470
Differential output, VOUT = 1 V p-p
220
Input Bias Current
Pins IPPx
−8 −5
Input Resistance
Pins IPPx at dc; ΔVIN/ΔIBIAS
4.2
Input Capacitance
Pins IPPx
2
Input Impedance
Pins IPPx at 10 MHz
7.9
Input Voltage Noise
2.3
Input Current Noise
2
Noise Figure (Differential Output)
VGAIN = 0.7 V, RS = 50 Ω, unterminated
9
Output-Referred Noise (Differential Output)
VGAIN = 0.7 V (Gain = 30 dB)
72
VGAIN = −0.7 V (Gain = 6 dB)
45
Output Impedance
VGAx, dc to 10 MHz
3.5
Differential output, dc to 10 MHz
<1
Output Signal Range
Preamp
|VS| − 1.3
VGAx, RL ≥ 500 Ω
|VS| − 1.3
Differential amplifier, RL ≥ 500 Ω per side
|VS| − 0.5
Output Offset Voltage
Preamp offset
−6 |<1|
VGAx offset, VGAIN = 0.7 V
−18 |<5|
Differential output offset, VGAIN = 0.7 V
−38 |<10|
DYNAMIC PERFORMANCE
Harmonic Distortion
VGAx = 1 V p-p, differential output =
2 V p-p (measured at VGAx)
HD2 f = 1 MHz
−73
HD3 −68
HD2 f = 10 MHz
−71
HD3 −61
HD2 f = 35 MHz
−60
HD3 −53
VGAx = 1 V p-p, differential output = 2 V p-p
(measured at differential output)
HD2 f = 1 MHz
−78
HD3 −66
HD2 f = 10 MHz
−71
HD3 −43
HD2 f = 35 MHz
−56
HD3 −20
Input 1 dB Compression Point
VGAIN = −0.7 V, f = 10 MHz
7
VGAIN = +0.7 V, f = 10 MHz
−9.6
Max
−3
+6
+18
+38
Unit
MHz
MHz
MHz
MHz
V/μs
V/μs
V/μs
V/μs
μA
pF
nV/√Hz
pA/√Hz
dB
nV/√Hz
nV/√Hz
Ω
Ω
V
V
V
mV
mV
mV
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBm2
dBm
Rev. B | Page 3 of 40

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AD8264 전자부품, 판매, 대치품
AD8264
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Voltage
Supply Voltage (VPOS, VNEG)
Input Voltage (INPx)
Gain Voltage (GNHx, GNLO)
Power Dissipation
Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 60 sec)
Package Glass Transition Temperature (TG)
Rating
±6 V
VPOS, VNEG
VPOS, VNEG
2.5 W
−40°C to +105°C
−65°C to +150°C
300°C
150°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
Data Sheet
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages. The θJA
values in Table 3 assume a 4-layer JEDEC standard board with
zero airflow.
Table 3. Thermal Resistance
Package Type
θJA
40-Lead LFCSP1
31.0
1 4-Layer JEDEC board (2S2P).
θJC
2.3
Unit
°C/W
MAXIMUM POWER DISSIPATION
The maximum safe power dissipation for the AD8264 is limited
by the associated rise in junction temperature (TJ) on the die. At
approximately 150°C, which is the glass transition temperature,
the properties of the plastic change. Even temporarily exceeding
this temperature limit may change the stresses that the package
exerts on the die, permanently shifting the parametric performance
of the amplifiers. Exceeding a temperature of 150°C for an
extended period can cause changes in silicon devices, potentially
resulting in a loss of functionality.
ESD CAUTION
Rev. B | Page 6 of 40

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