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AD605AR-REEL7 |AD605ARREEL7ADN/a85avai6.5V; 1.2-1.4W; dual, low-noise, single-supply variable gain amplifier. For ultrasound and sonar time-gain control, high performance AGC systems
AD605BR-REEL |AD605BRREELADN/a803avai6.5V; 1.2-1.4W; dual, low-noise, single-supply variable gain amplifier. For ultrasound and sonar time-gain control, high performance AGC systems


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AD605AR-REEL7-AD605BR-REEL
6.5V; 1.2-1.4W; dual, low-noise, single-supply variable gain amplifier. For ultrasound and sonar time-gain control, high performance AGC systems
REV.B
Dual, Low Noise, Single-Supply
Variable Gain Amplifier
FUNCTIONAL BLOCK DIAGRAM
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 5V Supply
Low Power:90mW/Channel
Drives A/D Converters Directly
APPLICATIONS
Ultrasound and Sonar Time-Gain Control
High Performance AGC Systems
Signal Measurement
PRODUCT 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 5V 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-1.5-R 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 –14dB to +34 dB and 0dB to +48 dB can be
selected by a single resistor between pins FBK and OUT. The
lower and upper gain range 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 MΩ and scale factors from 20 dB/V to 30dB/V for a
VREF input voltage of 2.5 V to 1.67 V respectively. Note that
scale factors up to 40 dB are achievable with reduced accuracy
for scales above 30 dB. The gain scales linearly with control volt-
ages (VGN) of 0.4 V to 2.4V 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 1.9mA. Under normal
operation, the quiescent supply current of each amplifier chan-
nel is only 18mA.
The AD605 is available in a 16-lead plastic DIP and SOIC, and
is guaranteed for operation over the –40°C to +85°C tempera-
ture range.
AD605–SPECIFICATIONS
(Each Channel at TA = 25�C, VS = 5V, RS = 50
�, RL = 500�, CL = 5pF, VREF = 2.5 V
(Scaling = 20dB/V), –14 dB to +34 dB gain range, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage +VS
Pins 12, 13 (with Pins 4, 5 = 0 V) . . . . . . . . . . . . . . . 6.5 V
Input Voltages Pins 1–3, 6–9, 16 . . . . . . . . . . . . . . . VPOS, 0
Internal Power Dissipation
Plastic (N) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 W
Small Outline (R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 W
Operating Temperature Range . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Lead Temperature, Soldering 60 seconds . . . . . . . . . . 300°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ORDERING GUIDE
PIN FUNCTION DESCRIPTIONS
16-Lead Package for Dual Channel AD605
PIN CONFIGURATION
CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
TPC 1.Gain vs. VGN
TPC 4.Gain Scaling vs. VREF
TPC 7.Gain Error vs. VGN for
Different Gain Scalings
TPC 2.Gain vs. VGN for Different
Gain Ranges
TPC 5.Gain Error vs. VGN at
Different Temperatures
TPC 8.Gain Match, VGN1 = VGN2 =
1.0 V
(VREF = 2.5 V (20 dB/V Scaling), f = 1 MHz, RL = 500
�, CL = 5 pF, TA = 25�C, VSS = 5 V)AD605–Typical Performance Characteristics (per Channel)
TPC 3.Gain vs. VGN for Different
Gain Scalings
TPC 6.Gain Error vs. VGN at
Different Frequencies
TPC 9.Gain Match, VGN1 = VGN2 =
2.50 V
TPC 10.AC Response
TPC 13.Input Referred Noise vs.
VGN
TPC 16.Input Referred Noise vs.
RSOURCE
TPC 11.Output Offset vs. VGN
TPC 14.Input Referred Noise vs.
Temperature
TPC 17.Noise TPC vs. RSOURCE
TPC 12.Output Referred Noise vs.
VGN
TPC 15.Input Referred Noise vs.
Frequency
TPC 18.Noise TPC vs. VGN
AD605
TPC 19.Harmonic Distortion vs.
Frequency
TPC 22.1 dB Compression vs. VGN
TPC 25.Small Signal Pulse Response
TPC 20.Harmonic Distortion vs. VGN
TPC 23.Third Order Intercept vs. VGN
TPC 26.Power-Up/Down Response
TPC 21.Intermodulation Distortion
TPC 24.Large Signal Pulse Response
TPC 27.Gain Response
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