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AD605AR-AD605BR
Dual, Low Noise, Single-Supply Variable Gain Amplifier
REV.A
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 DESCRIPTIONThe 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
control. 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 astage 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
approximately 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 voltages (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
channel is only 18mA.
The AD605 is available in a 16-pin 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 = +258C, VS = +5V, RS = 50V, RL = 500V, CL = 5
pF, VREF = 2.5 V
(Scaling = 20dB/V) , –14 dB to +34 dB gain range, unless otherwise noted.)
ABSOLUTE MAXIMUM RATINGS1Supply Voltage +VS
Pins 12, 13 (with Pins 4, 5 = 0 V) . . . . . . . . . . . . . . +6.5 V
Input Voltages
Pins 2, 3, 6, 7 . . . . . . . . . . . . . . .VPOS/2 ±2 V Continuous
Pins 1, 8, 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
NOTESStresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional opera-
tion 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 maxi-
mum rating conditions for extended periods may affect device reliability.
2When driven from an external low impedance source.
ORDERING GUIDE*N = Plastic DIP, R = Small Outline IC (SOIC).
PIN CONFIGURATION
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD605 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
PIN DESCRIPTIONS
16-Pin Package for Dual Channel AD605
VGN – Volts
GAIN – dB
–10Figure 1.Gain vs. VGN
VREF – Volts
GAIN SCALING – dBV
32.5Figure 4.Gain Scaling vs. VREF
VGN – Volts
GAIN ERROR – dB
0.5Figure 7.Gain Error vs. VGN for
Different Gain Scalings
VGN – Volts
GAIN – dB
–10Figure 2.Gain vs. VGN for Different
Gain Ranges
VGN –Volts
GAIN ERROR – dB
0.0Figure 5.Gain Error vs. VGN at
Different Temperatures
DELTA GAIN – dB
PERCENTAGE–0.8–0.6–0.4–0.20.00.20.4
0.60.8Figure 8.Gain Match, VGN1 = VGN2
= 1.0 V
Figure 3.Gain vs. VGN for Different
Gain Scalings
Figure 6.Gain Error vs. VGN at
Different Frequencies
Figure 9.Gain Match, VGN1 = VGN2
= 2.50 V
(VREF = 2.5 V (20 dB/V Scaling), f = 1 MHz, RL = 500Ω, CL = 5 pF, TA = 258C, VSS = +5 V)
AD605–Typical Performance Characteristics (per Channel)
FREQUENCY – Hz
GAIN – dB
100k1M100M10M
–40
Figure 10.AC Response
VGN – Volts
NOISE – nV/
Figure 13.Input Referred Noise vs.
VGN
FREQUENCY – Ω
0.11101k100NOISE – nV/
Figure 16.Input Referred Noise vs.
RSOURCE
VGN – Volts
– Volts
2.505
Figure 11.Output Offset vs. VGN
TEMPERATURE – °C
NOISE – nV/
Figure 14.Input Referred Noise vs.
Temperature
RSOURCE – Ω
NOISE FIGURE – dB
1101k100
Figure 17.Noise Figure vs. RSOURCE
VGN – Volts
NOISE – nV/
Figure 12.Output Referred Noise vs.
VGN
Figure 15.Input Referred Noise vs.
Frequency
VGN – Volts
NOISE FIGURE – dB
0.10.52.90.91.31.72.12.5
Figure 18.Noise Figure vs. VGN
AD605
FREQUENCY – Hz
HARMONIC DISTORTION – dBc
100k1M100M10M
–45
Figure 19.Harmonic Distortion vs.
Frequency
VGN – Volts
– dBm
–15
Figure 22.1 dB Compression vs.
VGN
100ns / DIV
40mV / DIV
253ns1.253µs
TRIG'D
Figure 25.Small Signal Pulse
Response
VGN – Volts
HARMONIC DISTORTION – dBc
–45
Figure 20.Harmonic Distortion vs.
VGN
VGN – Volts
INTERCEPT – dBm
0.6131.41.82.22.6
Figure 23.3rd Order Intercept vs.
VGN
VGN – Volts
2.9V
0.0V
Figure 26.Power-Up/Down
Response
Figure 21.Intermodulation
Distortion
Figure 24.Large Signal Pulse
Response
Figure 27.Gain Response
