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AD8335-EVAL 데이터시트(PDF) 1 Page - Analog Devices

부품명 AD8335-EVAL
상세설명  Quad Low Noise, Low Cost Variable Gain Amplifier
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Quad Low Noise, Low Cost
Variable Gain Amplifier
AD8335
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 owners.
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
© 2004 Analog Devices, Inc. All rights reserved.
FEATURES
Low noise preamplifier (PrA)
Voltage noise = 1.3 nV/√Hz typical
Current noise = 2.4 pA/√Hz typical
NF = 7 dB (RS = RIN = 50 Ω)
Single-ended input; VIN max = 625 mV p-p
Active input match
Input SNR (noise bandwidth = 20 MHz) = 92 dB
VGA
Differential output
VOUT max = 5 V p-p, RL = 500 Ω differential
Gain range (8 dB output gain step)
−10 dB to +38 dB—LO gain mode
−2 dB to +46 dB—HI gain mode
Accurate linear-in-dB gain control
PrA + VGA performance
−3 dB bandwidth of 70 MHz
Excellent overload performance
Supply: 5 V
Power consumption
95 mW/channel (380 mW total)
65 mW/channel (PrA off; 260 mW total)
Power-down
APPLICATIONS
Medical imaging (ultrasound, gamma cameras)
Sonar
Test and measurement
Precise, stable wideband gain control
FUNCTIONAL BLOCK DIAGRAM
63
PIP1
64
PMD1
1
PMD2
2
PIP2
4
PON2
5
POP2
6
VIP2
7
VIN2
10
VIN3
11
VIP3
12
POP3
13
PON3
15
PIP3
16
PMD3
17
PMD4
18
PIP4
61
60
59
58
53
55
52
51
49
47
VOH1
46
VOL1
56
VGN1
50
SL12
54
VGN2
43
VOL2
42
VOH2
39
VOH3
38
VOL3
27
VGN3
31
SL34
25
VGN4
35
VOL4
34
VOH4
20
21
22
23
28
26
29
30
32
18dB
18dB
18dB
18dB
VMD1
VMD2
VMD3
VMD4
INTERPOLATOR
INTERPOLATOR
INTERPOLATOR
INTERPOLATOR
20dB
TO
28dB
20dB
TO
28dB
20dB
TO
28dB
20dB
TO
28dB
ATTEN
–48dB TO
0dB
ATTEN
–48dB TO
0dB
ATTEN
–48dB TO
0dB
ATTEN
–48dB TO
0dB
GAIN INT
GAIN INT
GAIN INT
GAIN INT
AD8335
Figure 1.
GENERAL DESCRIPTION
The AD8335 is a quad variable gain amplifier (VGA) with low
noise preamplifier intended for cost and power sensitive
applications. Each channel features a gain range 48 dB, fully
differential signal paths, active input preamplifier matching, and
user-selectable maximum gains of 46 dB and 38 dB. Individual
gain controls are provided for each channel.
The preamplifier (PrA) has a single-ended to differential gain
of ×8 (18.06 dB) and accepts input signals ≤ 625 mV p-p. PrA
noise is 1.2 nV/√Hz and the combined input referred voltage
noise of the PrA and VGA is 1.3 nV/√Hz at maximum gain.
Assuming a 20 MHz noise bandwidth (NBW), the Nyquist
frequency for a 40 MHz ADC, the input SNR is 92 dB. The
HILO pin optimizes the output SNR for 10-bit and 12-bit
ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs.
Channels 1 and 2 are enabled through the EN12 pin while
Channels 3 and 4 are enabled through the EN34 pin. For VGA
only applications, the PrAs can be powered down, significantly
reducing power consumption.
The AD8335 is available in a 64-lead lead frame chip scale
(9 mm × 9 mm) package for the industrial temperature range
of −40°C to +85°C.


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