AD604ARSZ-RL

AD604ARSZ-RL Datasheet

The AD604 is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier VGA optimized for timebased variable gain control in ultrasound applications however, it supports any application requiring low noise, wide bandwidth, variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control for ease of use. User-determined gain ranges, gain scaling dB/V , and dc level shifting of output further optimize performance.

Part	Datasheet
AD604ARSZ-RL	AD604ARSZ-RL (pdf)

Related Parts	Information
AD604AR	AD604AR

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Ultralow input noise at maximum gain 2 independent linear-in-dB channels Absolute gain range per channel programmable 0 dB to 48 dB preamplifier gain = 14 dB through 6 dB to 54 dB preamplifier gain = 20 dB dB gain accuracy Bandwidth 40 MHz −3 dB Input resistance 300 kΩ Variable gain scaling 20 dB/V through 40 dB/V Stable gain with temperature and supply variations Single-ended unipolar gain control Power shutdown at lower end of gain control Drive ADCs directly Ultrasound and sonar time-gain controls High performance AGC systems Signal measurement The AD604 is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier VGA optimized for timebased variable gain control in ultrasound applications however, it supports any application requiring low noise, wide bandwidth, variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control for ease of use. User-determined gain ranges, gain scaling dB/V , and dc level shifting of output further optimize performance. Each channel of the AD604 uses a high performance preamplifier that provides an input-referred noise voltage of The very accurate linear-in-dB response of the AD604 is achieved with the differential input exponential amplifier DSX-AMP architecture. Each DSX-AMP comprises a variable attenuator of 0 dB to dB followed by a high speed fixed-gain amplifier. The attenuator is a 7-stage R-1.5R ladder network. The attenuation between tap points is dB and dB for the ladder network. The equation for the linear-in-dB gain response is G dB = Gain Scaling dB/V x VGN V + Preamp Gain dB 19 dB Dual, Ultralow Noise Variable Gain Amplifier AD604 FUNCTIONAL BLOCK DIAGRAM PAOx +DSXx VGNx DIFFERENTIAL ATTENUATOR PAIx R-1.5R LADDER NETWORK 0dB TO PROGRAMMABLE ULTRALOW NOISE PREAMPLIFIER G = 14dB TO 20dB PRECISION PASSIVE INPUT ATTENUATOR Figure GAIN CONTROL AND SCALING VREF OUTx VOCM FIXED GAIN AMPLIFIER 34.4dB 00540-001 Preamplifier gains between 5 and 10 14 dB and 20 dB provide overall gain ranges per channel of 0 dB through 48 dB and 6 dB through 54 dB. The two channels of the AD604 can be cascaded to provide greater levels of gain range by bypassing the preamplifier of the second channel. However, in multiple channel systems, cascading the AD604 with other devices in the AD60x VGA family that do not include a preamplifier may provide a more efficient solution. The AD604 provides access to the output of the preamplifier, allowing for external filtering between the preamplifier and the differential attenuator stage. Note that scale factors up to 40 dB/V are achievable with reduced accuracy for scales above 30 dB/V. The gain scales linearly in decibels with control voltages of V to V with the 20 dB/V scale. Below and above this gain control range, the gain begins to deviate from the ideal linear-in-dB control law. The gain control region below V is not used for gain control. When the gain control voltage is <50 mV, the amplifier channel is powered down to mA. The AD604 is available in 24-lead SSOP, SOIC, and PDIP packages and is guaranteed for operation over the −40°C to +85°C temperature range. 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: Fax Analog Devices, Inc. All rights reserved. AD604 TABLE OF CONTENTS ESD 5 Pin Configuration and Function 6 Typical Performance Characteristics 7 Theory of Operation 13 14 Differential Ladder Attenuator 15 AC Coupling 16 Gain Control 16 Active Feedback Amplifier Fixed-Gain Amp 16 Applications Information 18 Ultralow Noise AGC Amplifier with 82 dB to 96 dB Gain Range 19 Ultralow Noise, Differential Input-Differential Output 21 Medical Ultrasound TGC Driving the AD9050, a 10-Bit, 40 MSPS 22 Evaluation Board 24 Using the 24 DSX Input Connections 24 Preamplifier Gain 25 Outputs 25 DC Operating 25 Evaluation Board Artwork and Schematic 26 Outline Dimensions 28 Ordering Guide 29 AD604 SPECIFICATIONS Each amplifier channel at TA = 25°C, VS = ±5 V, RS = 50 Ω, RL = 500 Ω, CL = 5 pF, VREF = V scaling = 20 dB/V , 0 dB to 48 dB gain range preamplifier gain = 14 dB , VOCM = V, C1 and C2 = uF see Figure 37 , unless otherwise noted. Table Parameter INPUT CHARACTERISTICS Preamplifier Input Resistance Input Capacitance Input Bias Current Peak Input Voltage Input Voltage Noise Input Current Noise Figure DSX Input Resistance Input Capacitance Peak Input Voltage Input Voltage Noise Input Current Noise Figure 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 Third-Order Intercept 1 dB Compression Point Channel-to-Channel Crosstalk Group Delay Variation VOCM Input Resistance Conditions Min Typ Max Unit Preamplifier gain = 14 dB Preamplifier gain = 20 dB VGN = V, RS = 0 Ω Preamplifier gain = 14 dB Preamplifier gain = 20 dB Independent of gain RS = 50 Ω, f = 10 MHz, VGN = V RS = 200 Ω, f = 10 MHz, VGN = V VGN = V VGN = V RS = 50 Ω, f = 10 MHz, VGN = V RS = 200 Ω, f = 10 MHz, VGN = V f = 1 MHz, VGN = V Constant with gain VGN = V, output = 1 V step RL 500 Ω f = 10 MHz VGN = 1 V, VOUT = 1 V p-p f = 1 MHz f = 1 MHz f = 10 MHz f = 10 MHz VGN = V, VOUT = 1 V p-p f = 1 MHz f = 10 MHz f = 10 MHz, VGN = V, VOUT = 1 V p-p, input referred f = 1 MHz, VGN = V, output referred VOUT = 1 V p-p, f = 1 MHz, Channel 1 VGN = V, inputs shorted, Channel 2 VGN = V mid gain 1 MHz < f < 10 MHz, full gain range 300 −27 ±400 ±200 175 ± 2 12 −20 40 170 ± 2 ±40 −54 −67 −43 −48 −74 −71 15 −30 ±2 45 kΩ pF mA mV Ω pF V dB MHz V/us V Ω mA dBc dBm dBm dB ns kΩ AD604 Parameter ACCURACY Absolute Gain Error 0 dB to 3 dB 3 dB to 43 dB 43 dB to 48 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 VREF Input Resistance POWER SUPPLY Specified Operating Range Power Dissipation ORDERING GUIDE Model Temperature Range AD604AN −40°C to +85°C AD604ANZ1 −40°C to +85°C AD604AR −40°C to +85°C AD604AR-REEL −40°C to +85°C AD604ARZ1 −40°C to +85°C AD604ARZ-RL1 −40°C to +85°C AD604ARS −40°C to +85°C AD604ARS-REEL −40°C to +85°C AD604ARS-REEL7 −40°C to +85°C AD604ARSZ1 −40°C to +85°C AD604ARSZ-RL1 −40°C to +85°C AD604ARSZ-R71 −40°C to +85°C AD604-EVALZ1 1 Z = RoHS Compliant Part. Package Description 24-Lead Plastic Dual In-Line Package [PDIP] 24-Lead Plastic Dual In-Line Package [PDIP] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] Evaluation Board 060106-A AD604 Package Option N-24-1 N-24-1 RW-24 RW-24 RW-24 RW-24 RS-24 RS-24 RS-24 RS-24 RS-24 RS-24 AD604 NOTES NOTES AD604 AD604 NOTES Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00540-0-10/08 E

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Ultralow input noise at maximum gain
2 independent linear-in-dB channels Absolute gain range per channel programmable
0 dB to 48 dB preamplifier gain = 14 dB through 6 dB to 54 dB preamplifier gain = 20 dB
dB gain accuracy Bandwidth 40 MHz −3 dB Input resistance 300 kΩ Variable gain scaling 20 dB/V through 40 dB/V Stable gain with temperature and supply variations Single-ended unipolar gain control Power shutdown at lower end of gain control Drive ADCs directly

Ultrasound and sonar time-gain controls High performance AGC systems Signal measurement

The AD604 is an ultralow noise, very accurate, dual-channel, linear-in-dB variable gain amplifier VGA optimized for timebased variable gain control in ultrasound applications however, it supports any application requiring low noise, wide bandwidth, variable gain control. Each channel of the AD604 provides a 300 kΩ input resistance and unipolar gain control for ease of use. User-determined gain ranges, gain scaling dB/V , and dc level shifting of output further optimize performance.

Each channel of the AD604 uses a high performance preamplifier that provides an input-referred noise voltage of The very accurate linear-in-dB response of the AD604 is achieved with the differential input exponential amplifier DSX-AMP architecture. Each DSX-AMP comprises a variable attenuator of 0 dB to dB followed by a high speed fixed-gain amplifier. The attenuator is a 7-stage R-1.5R ladder network. The attenuation between tap points is dB and dB for the ladder network.

The equation for the linear-in-dB gain response is

G dB = Gain Scaling dB/V x VGN V + Preamp Gain dB 19 dB

Dual, Ultralow Noise Variable Gain Amplifier

AD604

FUNCTIONAL BLOCK DIAGRAM

PAOx +DSXx

VGNx

DIFFERENTIAL ATTENUATOR

PAIx

R-1.5R LADDER NETWORK
0dB TO

PROGRAMMABLE ULTRALOW NOISE

PREAMPLIFIER G = 14dB TO 20dB

PRECISION PASSIVE INPUT ATTENUATOR

Figure

GAIN CONTROL AND SCALING

VREF

OUTx VOCM

FIXED GAIN AMPLIFIER
34.4dB
00540-001

Preamplifier gains between 5 and 10 14 dB and 20 dB provide overall gain ranges per channel of 0 dB through 48 dB and 6 dB through 54 dB. The two channels of the AD604 can be cascaded to provide greater levels of gain range by bypassing the preamplifier of the second channel. However, in multiple channel systems, cascading the AD604 with other devices in the AD60x VGA family that do not include a preamplifier may provide a more efficient solution. The AD604 provides access to the output of the preamplifier, allowing for external filtering between the preamplifier and the differential attenuator stage.

Note that scale factors up to 40 dB/V are achievable with reduced accuracy for scales above 30 dB/V. The gain scales linearly in decibels with control voltages of V to V with the 20 dB/V scale. Below and above this gain control range, the gain begins to deviate from the ideal linear-in-dB control law. The gain control region below V is not used for gain control. When the gain control voltage is <50 mV, the amplifier channel is powered down to mA.

The AD604 is available in 24-lead SSOP, SOIC, and PDIP packages and is guaranteed for operation over the −40°C to +85°C temperature range.

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:

Fax Analog Devices, Inc. All rights reserved.

AD604

TABLE OF CONTENTS

ESD 5 Pin Configuration and Function 6 Typical Performance Characteristics 7 Theory of Operation 13
14 Differential Ladder Attenuator 15 AC Coupling 16 Gain Control 16 Active Feedback Amplifier Fixed-Gain Amp 16
Applications Information 18 Ultralow Noise AGC Amplifier with 82 dB to 96 dB Gain Range 19 Ultralow Noise, Differential Input-Differential Output 21 Medical Ultrasound TGC Driving the AD9050, a 10-Bit, 40 MSPS 22

Evaluation Board 24 Using the 24 DSX Input Connections 24 Preamplifier Gain 25 Outputs 25 DC Operating 25 Evaluation Board Artwork and Schematic 26
Outline Dimensions 28 Ordering Guide 29
AD604

SPECIFICATIONS

Each amplifier channel at TA = 25°C, VS = ±5 V, RS = 50 Ω, RL = 500 Ω, CL = 5 pF, VREF = V scaling = 20 dB/V , 0 dB to 48 dB gain range preamplifier gain = 14 dB , VOCM = V, C1 and C2 = uF see Figure 37 , unless otherwise noted.

Table Parameter INPUT CHARACTERISTICS

Preamplifier Input Resistance Input Capacitance Input Bias Current Peak Input Voltage

Input Voltage Noise

Input Current Noise Figure

DSX Input Resistance Input Capacitance Peak Input Voltage Input Voltage Noise Input Current Noise Figure

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

Third-Order Intercept
1 dB Compression Point Channel-to-Channel Crosstalk

Group Delay Variation VOCM Input Resistance

Conditions

Min Typ

Max Unit

Preamplifier gain = 14 dB Preamplifier gain = 20 dB VGN = V, RS = 0 Ω Preamplifier gain = 14 dB Preamplifier gain = 20 dB Independent of gain RS = 50 Ω, f = 10 MHz, VGN = V RS = 200 Ω, f = 10 MHz, VGN = V

VGN = V VGN = V RS = 50 Ω, f = 10 MHz, VGN = V RS = 200 Ω, f = 10 MHz, VGN = V f = 1 MHz, VGN = V

Constant with gain VGN = V, output = 1 V step RL 500 Ω f = 10 MHz

VGN = 1 V, VOUT = 1 V p-p f = 1 MHz f = 1 MHz f = 10 MHz f = 10 MHz VGN = V, VOUT = 1 V p-p f = 1 MHz f = 10 MHz f = 10 MHz, VGN = V, VOUT = 1 V p-p, input referred f = 1 MHz, VGN = V, output referred VOUT = 1 V p-p, f = 1 MHz, Channel 1 VGN = V, inputs shorted, Channel 2 VGN = V mid gain 1 MHz < f < 10 MHz, full gain range
300 −27 ±400 ±200
175 ± 2 12 −20
40 170 ± 2 ±40
−54 −67 −43 −48
−74 −71
15 −30
±2 45
kΩ pF mA mV
Ω pF V dB

MHz V/us V Ω mA
dBc dBm
dBm dB
ns kΩ

AD604

Parameter ACCURACY

Absolute Gain Error 0 dB to 3 dB 3 dB to 43 dB 43 dB to 48 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 VREF Input Resistance POWER SUPPLY Specified Operating Range

Power Dissipation
ORDERING GUIDE

Model

Temperature Range

AD604AN
−40°C to +85°C

AD604ANZ1
−40°C to +85°C

AD604AR
−40°C to +85°C

AD604AR-REEL
−40°C to +85°C

AD604ARZ1
−40°C to +85°C

AD604ARZ-RL1
−40°C to +85°C

AD604ARS
−40°C to +85°C

AD604ARS-REEL
−40°C to +85°C

AD604ARS-REEL7
−40°C to +85°C

AD604ARSZ1
−40°C to +85°C

AD604ARSZ-RL1
−40°C to +85°C

AD604ARSZ-R71
−40°C to +85°C

AD604-EVALZ1
1 Z = RoHS Compliant Part.

Package Description 24-Lead Plastic Dual In-Line Package [PDIP] 24-Lead Plastic Dual In-Line Package [PDIP] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Standard Small Outline Package [SOIC_W] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] 24-Lead Shrink Small Outline Package [SSOP] Evaluation Board
060106-A

AD604

Package Option N-24-1 N-24-1 RW-24 RW-24 RW-24 RW-24 RS-24 RS-24 RS-24 RS-24 RS-24 RS-24

AD604 NOTES

NOTES

AD604

AD604 NOTES

Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

D00540-0-10/08 E

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived AD604ARSZ-RL Datasheet file may be downloaded here without warranties.

Datasheet ID: AD604ARSZ-RL 517717