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AD8332ARU-REEL7 датащи(PDF) 1 Page - Analog Devices

номер детали AD8332ARU-REEL7
подробное описание детали  Dual VGA with Ultralow Noise Preamplifier and Programmable RIN
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8332ARU-REEL7 датащи(HTML) 1 Page - Analog Devices

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Dual VGA with Ultralow Noise
Preamplifier and Programmable RIN
AD8332
FEATURES
• Ultralow noise preamplifier
− Voltage noise = 0.74 nV/√Hz
− Current noise = 2.5 pA/√Hz
• 3 dB bandwidth: 120 MHz
• Low power: 125 mW/channel
• Wide gain range with programmable postamp
− –4.5 dB to +43.5 dB
− +7.5 dB to +55.5 dB
• Low output-referred noise: 48 nV/√Hz typical
• Active input impedance matching
• Optimized for 10-/12- bit ADCs
• Selectable output clamping level
• Single 5 V supply operation
• Available in space-saving chip scale package
APPLICATIONS
• Ultrasound and sonar time-gain control
• High performance AGC systems
• I/Q signal processing
• High speed dual ADC driver
GENERAL DESCRIPTION
The AD8332 is an ultralow noise, dual channel linear-in-dB
variable gain amplifier (VGA). Although optimized for ultrasound
systems, it may be used for a low noise variable gain control in any
application of frequencies up to 120 MHz.
Each channel of the AD8332 consists of an ultralow noise
preamplifier (LNA), an X-AMP VGA with 48 dB of gain range, and
a selectable gain postamplifier with adjustable output limiting. The
LNA gain is 19 dB with a single-ended input and differential
outputs capable of accurate, programmable active input impedance
matching by selecting an external feedback resistor. Active
impedance control optimizes noise performance for applications
that benefit from input matching.
The 48 dB gain range of the VGA makes the AD8332 suitable for a
variety of applications. Excellent bandwidth uniformity is
maintained across the entire range. The gain control interface
provides precise linear-in-dB scaling of 50 dB/V for control
voltages between 40 mV and 1 V. Factory trim ensures excellent
part-to-part and channel-to-channel gain matching. Differential
signal paths lead to superb second and third order distortion
performance and low crosstalk.
FUNCTIONAL BLOCK DIAGRAM
LNA 1
27
28
+19dB
23
26
LMD1
INH1
COM1
VPS1
LNA 2
1
2
3
6
LMD2
INH2
VSP2
COM2
BIAS
(VMID)
VGA 1
BIAS AND
INTERPOLATOR
VGA 2
5
7
4
25
24
22
21
8
14
18
VMID
POST
AMP2
POST
AMP1
11
CLAMP
GAIN
INT
20
9
19
17
16
10
13
12
[(–48 to 0) + 21] dB
3.5dB/
15.5dB
LON2 LOP2 VIP2 VIN2
COMM
ENB
RCLMP
VOH1
VOL1
GAIN
VOL2
VOH2
LON1 LOP1 VIP1 VIN1
VPSV
VCM1
15
HILO
VCM2
Figure 1. 28-Lead TSSOP
FREQUENCY – Hz
–10
0
10
20
40
30
50
100k
–20
1M
1G
100M
10M
VGAIN = 1V
0.8V
0.6V
0.4V
0.2V
0V
Figure 2. Frequency Response vs. Gain
The VGA’s low output-referred noise is advantageous in driving
high speed differential ADCs. The gain of the postamplifier may
be pin selected to 3.5 dB or 15.5 dB to optimize gain range and
output noise for 12-bit or 10-bit converter applications. The output
may be limited to a user-selected clamping level, preventing input
overload to a subsequent ADC. An external resistor adjusts the
clamping level.
The AD8332 is available in 28-lead TSSOP and 32-lead LFCSP
packages and operates from a single 5 V supply. The total quiescent
power consumption is 250 mW and a power-down pin is provided.
The operating temperature range is –40°C to +85°C.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no 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. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2002 Analog Devices, Inc. All rights reserved.


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