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Details, datasheet, quote on part number:AD605AN
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| Part: | AD605AN |
| Category: | Analog & Mixed-Signal Processing => Amplifiers => Operational Amplifiers => Low Noise |
| Description: | Accurate, Low Noise, Dual Channel Linear-in-db Variable Gain Amplifier, Optimized For Any Application Requiring High Performance |
| Company: | Analog Devices |
| Datasheet: | Download AD605AN datasheet File size : 198 kB |
| Request For quote: | Find where to buy AD605AN
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Datasheet text preview:
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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
FIXED GAIN AMPLIFIER +34.4dB OUT FBK VGN GAIN CONTROL AND SCALING PRECISION PASSIVE INPUT ATTENUATOR
VREF
VOCM +IN IN DIFFERENTIAL ATTENUATOR 0 TO 48.4dB
AD605
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 control. 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-1.5-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 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 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 M and 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 are achievable with reduced accuracy for scales above 30 dB. The gain scales linearly 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 a 16-lead plastic DIP and SOIC, and is guaranteed for operation over the 40°C to +85°C temperature range.
REV. B
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. 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 © Analog Devices, Inc., 2001
AD605SPECIFICATIONS (Scaling = 20 dB/V), 14 dB to +34 dB gain range, unless otherwise noted.)
Model Parameter INPUT CHARACTERISTICS Input Resistance Input Capacitance Peak Input Voltage Input Voltage Noise Input Current Noise Noise Figure Conditions AD605A Min Typ Max 175 ± 40 3.0 2.5 ± 2.5 1.8 2.7 8.4 12 20 40 170 2.5 ± 1.5 2 ± 40 64 68 51 53 72 60 +15 1 70 ± 2.0 45 AD605B Min Typ 175 ± 40 3.0 2.5 ± 2.5 1.8 2.7 8.4 12 20 40 170 2.5 ± 1.5 2 ± 40 64 68 51 53 72 60 +15 1 70 ± 2.0 45
(Each Channel at TA = 25 C, VS = 5 V, RS = 50
, RL = 500
, CL = 5 pF, VREF = 2.5 V
Max Unit pF V nV/ Hz pA/ Hz dB dB dB MHz V/µs V mA dBc dBc dBc dBc dBc dBc dBm dBm dB
Common-Mode Rejection Ratio OUTPUT CHARACTERISTICS 3 dB Bandwidth Slew Rate Output Signal Range Output Impedance Output Short-Circuit Current Harmonic Distortion HD2 HD3 HD2 HD3 Two-Tone Intermodulation Distortion (IMD) 1 dB Compression Point Third Order Intercept Channel-to-Channel Crosstalk
VGN = 2.9 V VGN = 2.9 V RS = 50 , f = 10 MHz at Minimum Gain, VGN = 2.9 V RS = 200 , f = 10 MHz at Minimum Gain, VGN = 2.9 V f = 1 MHz, VGN = 2.65 V Constant with Gain VGN = 1.5 V, Output = 1 V Step RL 500 f = 10 MHz VGN = 1 V, VOUT = 1 V p-p, f = 1 MHz f = 1 MHz f = 10 MHz f = 10 MHz R S = 0 , VGN = 2.9 V, VOUT = 1 V p-p f = 1 MHz f = 10 MHz f = 10 MHz, VGN = 2.9 V, Output Referred f = 10 MHz, VGN = 2.9 V, VOUT = 1 V p-p, Input Referred Ch1: VGN = 2.65 V, Inputs Shorted, Ch2: VGN = 1.5 V (Mid Gain), f = 1 MHz, VOUT = 1 V p-p 1 MHz < f < 10 MHz, Full Gain Range
Group Delay Variation VOCM Input Resistance ACCURACY Absolute Gain Error 14 dB to 11 dB 11 dB to +29 dB +29 dB to +34 dB Gain Scaling Error Output Offset Voltage Output Offset Variation GAIN CONTROL INTERFACE Gain Scaling Factor Gain Range Input Voltage (VGN) Range Input Bias Current Input Resistance Response Time POWER SUPPLY Power Dissipation VREF Input Resistance Quiescent Supply Current Power Down Power-Up Response Time Power-Down Response Time
ns k
0.25 V < VGN < 0.40 V 0.40 V < VGN < 2.40 V 2.40 V < VGN < 2.65 V 0.4 V < VGN < 2.4 V VREF = 2.500 V, VOCM = 2.500 V VREF = 2.500 V, VOCM = 2.500 V VREF = 2.5 V, 0.4 V < VGN < 2.4 V VREF = 1.67 V FBK Short to OUT FBK Open 20 dB/V, VREF = 2.5 V
1.2 1.0 3.5 50
+1.0 ± 0.3 1.25 ± 0.25 ± 30 30
+3.0 +1.0 +1.2 50 95
1.2 +0.75 1.0 ± 0.2 3.5 1.25 ± 0.25 50 ± 30 30 19
+3.0 +1.0 +1.2 50 50
dB dB dB dB/V mV mV dB/V dB/V dB dB V µA M µs mW k mA mA µs µs
19
48 dB Gain Change
20 21 30 14 +34 0 +48 0.1 2.9 0.4 2 0.2 90 10 18 1.9 0.6 0.4
20 21 30 14 +34 0 +48 0.1 2.9 0.4 2 0.2 90 10 18 1.9 0.6 0.4
VPOS VPOS, VGN < 50 mV 48 dB Gain, VOUT = 2 V p-p
23 3.0
23 3.0
2
REV. B
AD605
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage +VS Pins 12, 13 (with Pins 4, 5 = 0 V) . . . . . . . . . . . . . . . 6.5 V Input Voltages Pins 13, 69, 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 permanent 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.
PIN CONFIGURATION
VGN1 1 IN1 2 +IN1 3 GND1 4
16 VREF 15 OUT1 14 FBK1
13 VPOS TOP VIEW GND2 5 (Not to Scale) 12 VPOS +IN2 6 IN2 7 VGN2 8 11 FBK2 10 OUT2 9 VOCM
AD605
ORDERING GUIDE
Model AD605AN AD605AR AD605BN AD605BR AD605ACHIPS AD605AR-REEL AD605AR-REEL7 AD605BR-REEL AD605BR-REEL7 AD605-EB
Temperature Range 40°C to +85°C 40°C to +85°C 40°C to +85°C 40°C to +85°C
Package Description Plastic DIP Small Outline IC (SOIC) Plastic DIP Small Outline IC (SOIC) DIE 13" Reel 7" Reel 13" Reel 7" Reel Evaluation Board
Package Option N-16 R-16A N-16 R-16A
JA 85°C/W 100°C/W 85°C/W 100°C/W
PIN FUNCTION DESCRIPTIONS 16-Lead Package for Dual Channel AD605
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Mnemonic VGN1 IN1 +IN1 GND1 GND2 +IN2 IN2 VGN2 VOCM OUT2 FBK2 VPOS VPOS FBK1 OUT1 VREF
Description CH1 Gain-Control Input and Power-Down Pin. If grounded, device is off, otherwise positive voltage increases gain. CH1 Negative Input. CH1 Positive Input. Ground. Ground. CH2 Positive Input. CH2 Negative Input. CH2 Gain-Control Input and Power-Down Pin. If grounded, device is off, otherwise positive voltage increases gain. Input to this pin defines common-mode voltage for OUT1 and OUT2. CH2 Output. Feedback Pin that Selects Gain Range of CH2. Positive Supply. Positive Supply. Feedback Pin that Selects Gain Range of CH1. CH1 Output. Input to this pin sets gain-scaling for both channels: 2.5 V = 20 dB/V, 1.67 V = 30 dB/V.
CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V 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 s u b j e c t e d to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. B
3
AD605Typical Performance Characteristics (per Channel)
(VREF = 2.5 V (20 dB/V Scaling), f = 1 MHz, RL = 500
40 40 C, +25 C, +85 C 30 20
, CL = 5 pF, TA = 25 C, VSS = 5 V)
50 40 30 40 30 FBK (OPEN)
GAIN dB
ACTUAL 30dB/V (VREF = 1.67V)
ACTUAL
20 10 0
GAIN dB
GAIN dB
20 FBK (SHORT) 10 0
10 0
20dB/V (VREF = 2.50V)
10 20 0.1
10 20 0.1
10 20 0.1
0.5
0.9
1.3 1.7 2.1 VGN Volts
2.5
2.9
0.5
0.9
1.3 1.7 2.1 VGN Volts
2.5
2.9
0.5
0.9
1.3 1.7 2.1 VGN Volts
2.5
2.9
TPC 1. Gain vs. VGN
TPC 2. Gain vs. VGN for Different Gain Ranges
TPC 3. Gain vs. VGN for Different Gain Scalings
40.0 37.5
GAIN SCALING dBV
3.0 2.5 2.0 1.5
2.0 1.5 1.0
GAIN ERROR dB
THEORETICAL
GAIN ERROR dB
35.0 32.5 30.0 27.5 25.0 22.5 20.0 1.25 ACTUAL
1.0 0.5 0.0 0.5 1.0 1.5 2.0 2.5
f = 1MHz 0.5 0.0 f = 5MHz 0.5 1.0 1.5 f = 10MHz
40 C
+25 C +85 C
1.50
1.75 2.00 VREF Volts
2.25
2.50
3.0 0.2
0.7
1.2 1.7 VGN Volts
2.2
2.7
2.0 0.2
0.7
1.2 1.7 VGN Volts
2.2
2.7
TPC 4. Gain Scaling vs. VREF
TPC 5. Gain Error vs. VGN at Different Temperatures
TPC 6. Gain Error vs. VGN at Different Frequencies
2.0 1.5 1.0 GAIN ERROR dB PERCENTAGE 0.5 0.0 0.5 1.0 1.5 2.0 0.2 0.7 1.2 1.7 VGN Volts 2.2 2.7 30dB/V VREF = 1.67V 20dB/V VREF = 2.50V
20 18 16 14 N = 50 G(dB) = G(CH1) G(CH2)
20 18 16 14
PERCENTAGE
N = 50 G(dB) = G(CH1) G(CH2)
12 10 8 6 4 2 0
0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8
12 10 8 6 4 2 0
0.8 0.6 0.4 0.2 0.0 0.2 0.4 0.6 0.8
DELTA GAIN dB
DELTA GAIN dB
TPC 7. Gain Error vs. VGN for Different Gain Scalings
TPC 8. Gain Match, VGN1 = VGN2 = 1.0 V
TPC 9. Gain Match, VGN1 = VGN2 = 2.50 V
4
REV. B
AD605
60 40 20
VGN = 2.9V (FBK = OPEN) VGN = 2.9V (FBK = SHORT) VGN = 1.5V (FBK = OPEN)
2.525 2.520 2.515
VOCM = 2.50V 40 C
130 125 +85 C 120
NOISE nV/ Hz
2.510
VOS Volts
GAIN dB
VGN = 1.5V (FBK = SHORT) VGN = 0.1V (FBK = OPEN)
2.505 2.500 2.495 2.490
+25 C
115 110 105 100
+25 C
0
VGN = 0.1V (FBK = SHORT)
+85 C
40 C
20
VGN = 0.0V
40 60 100k
2.485 2.480
95
0 0.5 1.0 1.5 2.0 VGN Volts 2.5 3.0
10M 1M FREQUENCY Hz
100M
2.475
90
0
0.5
1.0
1.5 2.0 VGN Volts
2.5
3.0
TPC 10. AC Response
TPC 11. Output Offset vs. VGN
TPC 12. Output Referred Noise vs. VGN
1000
2.00 VGN = 2.9V 1.95
1.90 VGN = 2.9V 1.85
1.90
NOISE nV/ Hz
NOISE nV/ Hz
20 0 20 40 60 TEMPERATURE C 80 90
100
NOISE nV/ Hz
1.85 1.80 1.75 1.70 1.65
1.80 1.75 1.70 1.65 1.60 100k
10
1 0.1
0.5
0.9
1.3 1.7 2.1 VGN Volts
2.5
2.9
1.60 40
1M FREQUENCY Hz
10M
TPC 13. Input Referred Noise vs. VGN
TPC 14. Input Referred Noise vs. Temperature
TPC 15. Input Referred Noise vs. Frequency
00 VGN = 2.9V
30 VGN = 2.9V 25
OISE FIGURE dB
60 RS = 50 50
NOISE FIGURE dB
NOISE nV/ Hz
10
40 30 20 10
20
15
1
RSOURCE ALONE
10
0.1 1
1
10 100 FREQUENCY
1k
5 1 N
10 RSOURCE
100
1k
0 0.1
0.5
0.9
1.3 1.7 2.1 VGN Volts
2.5
2.9
TPC 16. Input Referred Noise vs. RSOURCE
TPC 17. Noise TPC vs. RSOURCE
TPC 18. Noise TPC vs. VGN
REV. B
5
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