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AD605 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD605
Beschreibung Dual/ Low Noise/ Single-Supply Variable Gain Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
AD605 Datasheet, Funktion
www.DataSheet4U.com
a
FEATURES
Two Independent Linear-in-dB Channels
Input Noise at Maximum Gain: 1.8 nV/Hz, 2.7 pA/Hz
Bandwidth: 40 MHz (–3 dB)
Differential Input
Absolute Gain Range Programmable:
–14 dB to +34 dB (FBK Shorted to OUT) Through
0 dB to +48 dB (FBK Open)
Variable Gain Scaling: 20 dB/V Through 40 dB/V
Stable Gain with Temperature and Supply Variations
Single-Ended Unipolar Gain Control
Output Common-Mode Independently Set
Power Shutdown at Lower End of Gain Control
Single 5 V Supply
Low Power: 90 mW/Channel
Drives A/D Converters Directly
APPLICATIONS
Ultrasound and Sonar Time-Gain Control
High Performance AGC Systems
Signal Measurement
Dual, Low Noise, Single-Supply
Variable Gain Amplifier
AD605
FUNCTIONAL BLOCK DIAGRAM
VGN
VREF
GAIN
CONTROL
AND
SCALING
PRECISION PASSIVE
INPUT ATTENUATOR
+IN DIFFERENTIAL
ATTENUATOR
–IN 0 TO –48.4dB
FIXED GAIN
AMPLIFIER
+34.4dB
OUT
FBK
VOCM
AD605
GENERAL DESCRIPTION
The AD605 is a low noise, accurate, dual channel, linear-in-dB
variable gain amplifier, which is optimized for any application
requiring high performance, wide bandwidth variable gain con-
trol. Operating from a single 5 V supply, the AD605 provides
differential inputs and unipolar gain control for ease of use.
Added flexibility is achieved with a user-determined gain range
and an external reference input which provides user-determined
gain scaling (dB/V).
The high performance linear-in-dB response of the AD605 is
achieved with the differential input, single supply, exponential
amplifier (DSX-AMP) architecture. Each of the DSX-AMPs
comprise a variable attenuator of 0 dB to –48.4 dB followed by
a high speed fixed gain amplifier. The attenuator is based on a
7-stage R-1.5R ladder network. The attenuation between tap
points is 6.908 dB, and 48.360 dB for the entire ladder network.
The DSX-AMP architecture results in 1.8 nV/Hz input noise
spectral density and will accept a ± 2.0 V input signal when
VOCM is biased at VP/2.
Each independent channel of the AD605 provides a gain range
of 48 dB which can be optimized for the application. Gain
ranges between –14 dB to +34 dB and 0 dB to +48 dB can be
selected by a single resistor between pins FBK and OUT. The
lower and upper gain ranges are determined by shorting pin
FBK to OUT, or leaving pin FBK unconnected, respectively.
The two channels of the AD605 can be cascaded to provide 96
dB of very accurate gain range in a monolithic package.
The gain control interface provides an input resistance of approxi-
mately 2 Mand scale factors from 20 dB/V to 30 dB/V for a
VREF input voltage of 2.5 V to 1.67 V, respectively. Note that
scale factors up to 40 dB/V are achievable with reduced accu-
racy for scales above 30 dB/V. The gain scales linearly in dB
with control voltages (VGN) of 0.4 V to 2.4 V for the 20 dB/V
scale and 0.20 V to 1.20 V for the 40 dB/V scale. When VGN
is <50 mV the amplifier is powered down to draw 1.9 mA.
Under normal operation, the quiescent supply current of each
amplifier channel is only 18 mA.
The AD605 is available in 16-lead PDIP and SOIC, and is
guaranteed for operation over the –40°C to +85°C tempera-
ture range.
REV. C
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. 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.






AD605 Datasheet, Funktion
www.DataSheet4U.com
AD605
–30
–35 VO = 1V p-p
VGN = 1.0V
–40
–45
–50
HD3
–55
HD2
–60
–65
–70
100k
1M 10M
FREQUENCY (Hz)
100M
TPC 19. Harmonic Distortion vs.
Frequency
–35
–40
–45
–50 HD2
(1MHz)
–55
HD 3
(10MHz)
HD 2
(10MHz)
–60
–65
–70 HD3
(1MHz)
–75
0.5 0.8 1.1 1.4 1.7 2.0 2.3 2.6 2.9
VGN (V)
TPC 20. Harmonic Distortion vs. VGN
–20
–30 f = 10MHz
–40 VO = 1V p-p
VGN = 1.0V
–50
–60
–70
–80
–90
–100
–110
–120
9.92
9.96 10 10.02 10.04
FREQUENCY (MHz)
TPC 21. Intermodulation Distortion
15
10
5 INPUT
GENERATOR
LIMIT = 21 dBm
0
–5
–10
–15 FREQ = 10MHz
FREQ = 1MHz
–20
0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9
VGN (V)
TPC 22. 1 dB Compression vs. VGN
35
VO = 1V p-p
30
25
f = 1MHz
20
f = 10MHz
15
10
5
0
–5
0.6 1 1.4 1.8 2.2 2.6 3
VGN (V)
TPC 23. Third Order Intercept vs. VGN
2V
VO = 2V p-p
VGN = 1.5V
–2V
253ns
100ns / DIV
1.253s
TPC 24. Large Signal Pulse Response
200
VO = 200mV p-p
VGN = 1.5V
2.9V
100
90
500mV
2.9V
100
90
500mV
TRIG'D
–200
253ns
100ns / DIV
1.253s
TPC 25. Small Signal Pulse Response
10
0%
0.0V
500mV
200ns
TPC 26. Power-Up/Down Response
10
0%
0.1V
500mV
100ns
TPC 27. Gain Response
–6– REV. C

6 Page









AD605 pdf, datenblatt
www.DataSheet4U.com
AD605
OUTLINE DIMENSIONS
16-Lead Plastic Dual In-Line Package [PDIP]
(N-16)
Dimensions shown in inches and (millimeters)
0.785 (19.94)
0.765 (19.43)
0.745 (18.92)
16 9
0.295 (7.49)
0.285 (7.24)
0.275 (6.99)
18
0.180 (4.57)
MAX
0.100 (2.54)
BSC
0.015 (0.38)
MIN
0.325 (8.26)
0.310 (7.87)
0.300 (7.62)
0.150 (3.81)
0.135 (3.43)
0.120 (3.05)
0.150 (3.81)
0.130 (3.30)
0.110 (2.79)
0.022 (0.56)
0.018 (0.46)
0.014 (0.36)
0.060 (1.52)
SEATING
PLANE
0.050 (1.27)
0.045 (1.14)
0.015 (0.38)
0.010 (0.25)
0.008 (0.20)
COMPLIANT TO JEDEC STANDARDS MO-095AC
CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
16-Lead Standard Small Outline Package [SOIC]
Narrow Body
(R-16)
Dimensions shown in millimeters and (inches)
10.00 (0.3937)
9.80 (0.3858)
4.00 (0.1575) 16
3.80 (0.1496) 1
9 6.20 (0.2441)
8 5.80 (0.2283)
0.25 (0.0098)
1.27 (0.0500) 1.75 (0.0689)
BSC
1.35 (0.0531)
0.50 (0.0197)
0.25 (0.0098)؋ 45؇
0.10 (0.0039)
COPLANARITY
0.10
8؇
0.51 (0.0201)
0.31 (0.0122)
SEATING
PLANE
0.25 (0.0098)
0.17 (0.0067)
0؇
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012AC
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
Revision History
Location
Page
7/04—Data Sheet Changed from REV. B to REV. C.
Edits to GENERAL DESCRIPTION ..............................................................................................................................................1
Edits to SPECIFICATIONS ...........................................................................................................................................................2
Edits to ORDERING GUIDE .........................................................................................................................................................3
Change to TPC 22 ..........................................................................................................................................................................6
Updated OUTLINE DIMENSIONS.............................................................................................................................................12
–12–
REV. C

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