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AD8338 데이터시트(PDF) 1 Page - Analog Devices

부품명 AD8338
상세설명  Low Power, 18 MHz Variable Gain Amplifier
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AD8338 데이터시트(HTML) 1 Page - Analog Devices

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Low Power, 18 MHz Variable Gain Amplifier
Data Sheet
AD8338
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2013–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Voltage controlled gain range of 0 dB to 80 dB
3 mA supply current at gain of 40 dB
Low frequency (LF) to 18 MHz operation
Supply range: 3.0 V to 5.0 V
Low noise: 4.5 nV/√Hz at 80 dB gain
Fully differential signal path
Offset correction (offset null) feature
Internal 1.5 V reference
16-lead LFCSP
Automatic gain control feature
Wide gain range for high dynamic range signals
APPLICATIONS
Front end for inductive telemetry systems
Ultrasonic signal receivers
Signal compression for driving an ADC
AGC amplifiers
FUNCTIONAL BLOCK DIAGRAM
INPR
INPD
INMD
INMR
MODE
COMM
GAIN
FBKM
OUTP
OUTM
DETO
VAGC
FBKP
+
+
VREF
VGA CORE
0dB TO 80dB
OFFSET NULL
OUTPUT
STAGE
0dB
OFSN
VREF
VBAT
AUTOMATIC
GAIN
CONTROL
GAIN INTERFACE
AD8338
Figure 1.
GENERAL DESCRIPTION
The AD8338 is a variable gain amplifier (VGA) for applications
that require a fully differential signal path, low power, low noise,
and a well-defined gain over frequency. Although the inputs are
differential, the device can also be driven with a single-ended
source if required.
The basic gain function is linear-in-dB and is controlled by the
voltage applied to Pin GAIN. The nominal gain range spans
from 0 dB to 80 dB for control voltages between 0.1 V to 1.1 V
with a slope of 12.5 mV/dB. The nominal gain range can be
shifted up or down via direct access to Pin INPD and Pin INMD,
the current inputs of the VGA. For example, driving the INPD
and INMD pins with 50 Ω resistors shifts the gain range up by
20 dB, that is, 20 dB to 100 dB, and lowers the input referred
noise of the device to 1.5 nV/√Hz. Additionally, the gain slope
can be inverted via logic Pin MODE.
The AD8338 includes additional circuit blocks to enable input
offset correction and automatic gain control (AGC). DC offset
voltages are removed by the offset correction circuit, which
behaves like a high-pass filter whose corner is set with an external
capacitor. The AGC function varies the gain of the AD8338 to
maintain a constant rms output voltage. An externally applied
voltage to Pin VAGC with respect to the voltage at Pin VREF
sets the output rms amplitude. A capacitor from Pin DETO to
ground sets the response time of the AGC circuit.
100
–40
–20
0
20
40
60
80
10k
100M
10M
1M
100k
FREQUENCY (Hz)
VGAIN = 0.1V
VGAIN = 0.2V
VGAIN = 0.3V
VGAIN = 0.4V
VGAIN = 0.5V
VGAIN = 0.6V
VGAIN = 0.7V
VGAIN = 0.8V
VGAIN = 0.9V
VGAIN = 1.0V
VGAIN = 1.1V
Figure 2. Gain vs. Frequency
The AD8338 offers additional versatility by providing access to
the internal summing nodes of the VGA core and the output
amplifiers. With the addition of a few external passive components,
users can customize the gain, bandwidth, input impedance, and
noise profile of the device to fit their application.
The AD8338 uses a single-supply voltage of 3.0 V to 5.0 V and
is very power efficient, consuming as little as 3 mA quiescent
current at mid gain. The AD8338 is available in a 3 mm × 3 mm,
RoHS-compliant, 16-lead LFCSP and is specified over the
industrial temperature range of −40°C to +85°C.


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