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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc. AD604AN

Name: AD604AN
Brand: Analog Devices Inc.
SKU: AD604AN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD604AN

Manufacturer:: Analog Devices Inc.

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 24-DIP (0.300", 7.62mm)

Datasheet:: AD604AN.pdf

Description:: IC AMP VGA DUAL ULN 40MA 24DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD604AN from Analog Devices is a dual-channel, ultralow-noise, linear-in-dB variable gain amplifier (VGA) with 0.80 nV/√Hz input voltage noise, 40 MHz −3 dB bandwidth, and ±1.0 dB absolute gain accuracy across 0 dB to 48 dB per channel. It integrates a programmable preamplifier (14 dB or 20 dB) and differential ladder attenuator (DSX), enabling precise time-gain control in ultrasound front-ends.

For engineers reviewing the AD604AN datasheet, AD604AN pinout, AD604AN application, or AD604AN equivalent, key selection considerations include unipolar gain control (0.1 V–2.9 V), VOCM-defined output common-mode level, dual independent channels with <−30 dB crosstalk at 1 MHz, and PDIP-24 package compatibility with legacy medical imaging signal chains.

Technical Context

The AD604AN implements a two-stage architecture: a ±5 V-powered ultralow-noise preamplifier (input-referred 0.8 nV/√Hz at 14 dB gain) followed by a single-supply DSX stage with R-1.5R ladder attenuator (0 dB to 48.36 dB) and fixed-gain active feedback amplifier. Gain scaling is programmable via VREF (20 dB/V at 2.5 V or 30 dB/V at 1.67 V).

Each channel features independent VGNx inputs for power-down (<50 mV) and linear-in-dB gain control, VOCM input to set output common-mode voltage (2.5 V typical), and access to preamplifier outputs (PAO1/PAO2) for external filtering. Input resistance is 300 kΩ (preamplifier) and 175 Ω (DSX), with 3.0 pA/√Hz input current noise independent of gain.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Noise	0.80 nV/√Hz at 14 dB preamp gain - enables detection of microvolt-level ultrasound echoes without SNR degradation.
Bandwidth	40 MHz (−3 dB), constant with gain - supports wideband pulse-echo imaging up to 20 MHz fundamental frequency.
Gain Accuracy	±1.0 dB over 3 dB–43 dB range - ensures consistent time-gain compensation across depth in TGC systems.
Gain Control Range	0 dB to 48 dB (14 dB preamp) or 6 dB to 54 dB (20 dB preamp) - covers full dynamic range of clinical ultrasound receivers.
Slew Rate	170 V/μs - handles fast-rising echo pulses without distortion in high-frame-rate scanning.
Channel Crosstalk	−30 dB at 1 MHz - prevents interference between adjacent beamformer channels in multi-element arrays.
Power-Down Current	1.9 mA per channel when VGN < 50 mV - reduces system standby power in portable sonography devices.

Pinout & Package

AD604AN is housed in a 24-lead plastic DIP (PDIP) package with 0.300-inch body width, compatible with through-hole assembly and legacy test fixtures. Thermal resistance θ_JA = 105°C/W and θ_JC = 35°C/W support operation from −40°C to +85°C.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (–DSX1)	Channel 1 DSX negative input	Differential signal path into attenuator stage; requires matched 175 Ω termination for optimal CMRR.
Pin 2 (+DSX1)	Channel 1 DSX positive input	Paired with Pin 1 for balanced drive of DSX ladder; rejects common-mode noise from transducer cables.
Pin 3 (PAO1)	Channel 1 preamplifier output	Accessible node for external bandpass filtering between preamp and DSX stages in ultrasound TGC designs.
Pin 4 (FBK1)	Channel 1 preamplifier feedback	Configures preamp gain: shorted to PAO1 = 14 dB; open = 20 dB; resistor-connected = intermediate gain.
Pin 5 (PAI1)	Channel 1 preamplifier noninverting input	High-impedance (300 kΩ), ground-referenced input for low-noise connection to transducer receive paths.
Pin 13 (VGN1)	Channel 1 gain control & shutdown	Unipolar 0.1–2.9 V input sets gain linearly in dB; <50 mV forces 1.9 mA shutdown mode.
Pin 14 (VOCM)	Output common-mode reference	Sets DC bias of OUT1/OUT2 outputs; 2.5 V nominal enables direct interface to 5 V ADCs like AD9050.
Pin 17/20 (VPOS)	Positive supply	±5 V dual supply required for preamp; DSX operates from +5 V only (pins 17/20 tied together).
Pin 18/19 (VNEG)	Negative supply	Required for preamp operation; VNEG pins must be connected to −5 V (not GND) for specified noise performance.
Pin 22 (OUT1)	Channel 1 signal output	Single-ended, rail-to-rail capable (2.5 ± 1.5 V) output driving 500 Ω loads directly into ADC front-ends.

Key Features

Feature	Design Value
Ultralow input voltage noise	0.80 nV/√Hz at 14 dB gain enables sub-microvolt signal recovery in deep-tissue ultrasound imaging.
Linear-in-dB gain control	20 dB/V scaling (VREF = 2.5 V) provides predictable 1 dB steps per 50 mV VGN change for precise TGC programming.
Independent channel shutdown	VGNx < 50 mV reduces per-channel supply current to 1.9 mA, supporting power-gating in multi-channel beamformers.
Programmable preamplifier gain	14 dB or 20 dB via FBKx connection - selects optimal noise-bandwidth trade-off for near-field vs. far-field echo reception.
Direct ADC drive capability	2.5 ± 1.5 V output swing into 500 Ω load meets input range of 10-bit, 40 MSPS ADCs (e.g., AD9050) without external buffering.

Applications

Ultrasound Time-Gain Control (TGC)	High-Performance AGC Systems
Use Scenario: Compensating for acoustic attenuation in B-mode ultrasound imaging, where echo amplitude decays exponentially with depth. IC Role / Device Role / Timing Role: Dual-channel VGA providing depth-dependent gain ramp (0–48 dB) synchronized to scan line timing. Use Value: Maintains uniform image brightness across 15–20 cm tissue depth using independent VGN1/VGN2 control and <±2 ns group delay variation.	Use Scenario: Stabilizing signal levels in RF receiver chains subject to varying antenna coupling or path loss. IC Role / Device Role / Timing Role: Low-noise VGA with 40 MHz bandwidth acting as closed-loop gain element in analog AGC loops. Use Value: Achieves 82–96 dB total dynamic range when cascaded, with −74 dBc IMD at 10 MHz ensuring minimal intermodulation distortion.
Signal Measurement Instrumentation	Medical Sonar Preprocessing
Use Scenario: Amplifying weak sensor outputs (e.g., piezoelectric accelerometers, hydrophones) in precision test equipment. IC Role / Device Role / Timing Role: First-stage gain block with 300 kΩ input impedance preserving source signal integrity. Use Value: 0.80 nV/√Hz noise floor and 170 V/μs slew rate enable accurate capture of transient events down to 100 ns duration.	Use Scenario: Conditioning return echoes in underwater sonar systems operating at 1–5 MHz carrier frequencies. IC Role / Device Role / Timing Role: Dual-channel VGA with independent gain control for beamforming channel calibration. Use Value: −30 dB crosstalk and 40 MHz bandwidth preserve spatial resolution while rejecting multipath interference in shallow-water deployments.

Ultrasound Time-Gain Control (TGC)

High-Performance AGC Systems

Use Scenario: Compensating for acoustic attenuation in B-mode ultrasound imaging, where echo amplitude decays exponentially with depth.

IC Role / Device Role / Timing Role: Dual-channel VGA providing depth-dependent gain ramp (0–48 dB) synchronized to scan line timing.

Use Value: Maintains uniform image brightness across 15–20 cm tissue depth using independent VGN1/VGN2 control and <±2 ns group delay variation.

Use Scenario: Stabilizing signal levels in RF receiver chains subject to varying antenna coupling or path loss.

IC Role / Device Role / Timing Role: Low-noise VGA with 40 MHz bandwidth acting as closed-loop gain element in analog AGC loops.

Use Value: Achieves 82–96 dB total dynamic range when cascaded, with −74 dBc IMD at 10 MHz ensuring minimal intermodulation distortion.

Signal Measurement Instrumentation

Medical Sonar Preprocessing

Use Scenario: Amplifying weak sensor outputs (e.g., piezoelectric accelerometers, hydrophones) in precision test equipment.

IC Role / Device Role / Timing Role: First-stage gain block with 300 kΩ input impedance preserving source signal integrity.

Use Value: 0.80 nV/√Hz noise floor and 170 V/μs slew rate enable accurate capture of transient events down to 100 ns duration.

Use Scenario: Conditioning return echoes in underwater sonar systems operating at 1–5 MHz carrier frequencies.

IC Role / Device Role / Timing Role: Dual-channel VGA with independent gain control for beamforming channel calibration.

Use Value: −30 dB crosstalk and 40 MHz bandwidth preserve spatial resolution while rejecting multipath interference in shallow-water deployments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD8367ARUZ	Single-channel, 45 dB gain range, 750 MHz bandwidth, higher 1.6 nV/√Hz noise, no preamplifier stage	Optimized for RF/IF gain control above 10 MHz; lacks ultralow-noise preamp for baseband ultrasound	Select AD8367ARUZ for wideband RF AGC where bandwidth >100 MHz is critical and noise <1 nV/√Hz is not required.
LMH6502MA	Single-channel, 0–40 dB gain, 1.1 GHz bandwidth, 2.7 nV/√Hz noise, no DSX architecture	Designed for video and high-speed data; lacks linear-in-dB control law and TGC-specific features	Choose LMH6502MA for high-speed analog signal routing where dB-linear control and sub-nV noise are secondary to bandwidth.

Compared with AD8367ARUZ and LMH6502MA, the AD604AN uniquely combines dual-channel integration, 0.80 nV/√Hz noise, and programmable preamplifier gain-making it irreplaceable for clinical ultrasound TGC where baseband SNR and channel matching are paramount.

Availability

AD604AN is available at Aetrix Electronics and suitable for ultrasound imaging systems, medical sonar receivers, precision signal measurement instruments, and high-dynamic-range AGC circuits requiring stable component supply across extended product lifecycles.

Supply support for AD604AN includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD604AN belongs to Analog Devices' precision variable gain amplifier product line, engineered specifically for time-domain gain control in medical ultrasound and sonar systems where ultralow noise, gain accuracy, and channel independence are critical.

FAQ

What is the maximum gain range achievable per channel on the AD604AN?

The AD604AN supports two user-selectable gain ranges per channel: 0 dB to 48 dB when the internal preamplifier is configured for 14 dB gain, or 6 dB to 54 dB when set to 20 dB gain. This is achieved by connecting the FBK1/FBK2 pin to PAO1/PAO2 (14 dB) or leaving it open (20 dB). The DSX attenuator contributes −14 dB to +34.4 dB, and the overall gain equation is G(dB) = (Gain Scaling × VGN) + (Preamp Gain − 19 dB). The AD604AN datasheet confirms these ranges under TA = 25°C, VS = ±5 V conditions.

How does the AD604AN achieve ultralow input voltage noise of 0.80 nV/√Hz?

The AD604AN achieves 0.80 nV/√Hz input voltage noise through a dedicated ±5 V-powered preamplifier stage using optimized on-chip resistors and low-noise transistor design. This preamplifier dominates the noise contribution, and its 300 kΩ input resistance minimizes Johnson noise. The DSX stage adds only 1.8 nV/√Hz (referred to input), but the overall input-referred noise remains 0.80 nV/√Hz at 14 dB preamp gain because the DSX noise is divided by the preamp's voltage gain. The AD604AN datasheet specifies this value under RS = 0 Ω, VGN = 2.9 V, and preamplifier gain = 14 dB conditions.

Can the AD604AN drive an ADC directly, and what output specifications support this?

Yes, the AD604AN is explicitly designed to drive ADCs directly. Its output delivers 2.5 ± 1.5 V signal swing into ≥500 Ω loads, matching the input range of 10-bit, 40 MSPS converters like the AD9050. With 40 MHz bandwidth, 170 V/μs slew rate, and −67 dBc HD3 at 1 MHz, the AD604AN maintains signal fidelity without external buffering. The VOCM pin allows precise setting of output common-mode voltage (e.g., 2.5 V) to align with ADC reference levels. These capabilities are validated in the "Medical Ultrasound TGC Driving the AD9050" application note (AD604 Rev. E, p.22).

What is the function of the COM1 and COM2 pins on the AD604AN?

The COM1 (Pin 6) and COM2 (Pin 7) pins on the AD604AN serve as signal ground references for Channels 1 and 2 preamplifiers, respectively. When either pin is connected to the positive supply (VPOS), the corresponding preamplifier shuts down-providing hardware-level channel disable independent of VGN control. This feature enables power gating in multi-channel systems to reduce idle current. The AD604AN datasheet states this behavior explicitly in the Pin Function Descriptions table (Rev. E, p.6), noting that tying COM1 to VPOS disables Preamplifier 1 while leaving DSX functionality intact if powered.

Does the AD604AN support differential input and output configurations?

The AD604AN supports differential input at the DSX stage (Pins 1/2 and 11/12) with 175 Ω input resistance per side, but its preamplifier inputs (Pins 5 and 8) are single-ended. Output is single-ended at Pins 22 (OUT1) and 15 (OUT2), though differential output can be synthesized using external components. The DSX inputs provide −20 dB CMRR at 1 MHz, and the VOCM pin (Pin 14) controls output common-mode level. While not a fully differential VGA, the AD604AN's DSX architecture inherently rejects common-mode noise on transducer cables-making it suitable for ultrasound applications where cable-induced interference is dominant.

AD604AN Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: X-AMP®

Package/Case:: 24-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: Variable Gain

Number of Circuits:: 2

Output Type:: -

Slew Rate:: 170V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 40 MHz

Current - Input Bias:: 400 nA

Voltage - Input Offset:: 30 mV

Current - Supply:: 32mA

Current - Output / Channel:: 40 mA

Voltage - Supply Span (Min):: 5 V

Voltage - Supply Span (Max):: 5 V

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 24-PDIP

AD604AN FAQ

1.How can I place an order for AD604AN through Aetrix?

Please submit a Request for Quotation (RFQ) for AD604AN on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD604AN reliable?

The price and inventory of AD604AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD604AN is usually 5 days.

3.What payment methods are accepted for AD604AN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD604AN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD604AN?

AD604AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD604AN order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD604AN?

For technical support, including AD604AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD604AN requirements.

6.How does Aetrix verify that AD604AN is sourced from the original manufacturer or authorized distributors?

All AD604AN products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD604AN meets industry standards.

7.What is the process for return or replacement of AD604AN?

All AD604AN units undergo pre-shipment inspection (PSI). If there is an issue with AD604AN, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD604AN part is unused and in its original packaging.

Return procedure for AD604AN:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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