Part A
AD8346ARU
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2410 PCS
- Package
- TSSOP-16
- Series
- RF Modulators
Replacement verdict
Not a drop-in replacement
The AD8346ARU and AD834ARZ are not drop-in replacements for one another. The AD8346ARU is a 2.5 GHz quadrature modulator, while the AD834ARZ is a 500 MHz four-quadrant analog multiplier. They differ in core function, frequency range, package, and supply requirements, so neither part can be substituted for the other without a full redesign of the surrounding circuit.
Different core function
Different frequency range
Different package
Different supply voltage
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8346ARU | AD834ARZ | Why it matters |
|---|---|---|---|
| Function | Quadrature modulator (I/Q modulator) | Analog multiplier / four-quadrant multiplier | These are fundamentally different signal-processing functions, so they are not functionally substitutable in most designs. |
| Frequency Range | 0.8 GHz to 2.5 GHz | DC to 500 MHz | Operating frequency band determines whether the part can be used in the target RF or baseband signal chain. |
| Package | 16-lead TSSOP | 8-lead SOIC | Different package footprints and pin counts prevent direct board-level drop-in replacement. |
| Supply Voltage | 2.7 V to 5.5 V | ±4 V to ±9 V (dual supply) | Supply requirements differ significantly, affecting power design and compatibility with existing rails. |
| Output Type | Single-ended RF output | Differential current output | Output interface differences require different external matching and load circuitry. |
| Input Configuration | Differential I and Q baseband inputs | Differential X and Y voltage inputs | Input signal format determines how the device interfaces with preceding stages. |
| Typical Application | RF quadrature modulation in transmitters | Analog multiplication, gain control, and modulation | Intended use cases differ, so substitution would require redesigning the surrounding circuit. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8346ARU | AD834ARZ |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | Active |
| Function | Modulator | Analog Multiplier |
| Number of Bits / Stages | - | 4-Quadrant |
| LO Frequency | 800MHz ~ 2.5GHz | - |
| RF Frequency | 800MHz ~ 2.5GHz | - |
| P1d B | -3dBm | - |
| Noise Floor | -147dBm/Hz | - |
| Output Power | -6dBm | - |
| Supply Current | 55 mA | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Test Frequency | 1.9GHz | - |
Frequently asked questions
Are the AD8346ARU and AD834ARZ functionally interchangeable?
No. The AD8346ARU is a 2.5 GHz quadrature modulator, while the AD834ARZ is a 500 MHz four-quadrant analog multiplier. They are different functional blocks and cannot be substituted for one another.
What are the core functions of the AD8346ARU and AD834ARZ?
The AD8346ARU is a direct-conversion quadrature modulator with an I/Q input interface and RF output, intended for digital and spread-spectrum modulation. The AD834ARZ is a wideband four-quadrant analog multiplier used for multiplication, squaring, and modulation applications.
How do the operating frequency ranges of the AD8346ARU and AD834ARZ compare?
The AD8346ARU operates over an RF range of 0.8 GHz to 2.5 GHz. The AD834ARZ is specified for operation up to 500 MHz. The AD8346ARU therefore targets higher-frequency RF modulation, while the AD834ARZ targets lower-frequency analog signal processing.
Do the AD8346ARU and AD834ARZ use the same package and pinout?
No. The AD8346ARU is supplied in a 16-lead TSSOP package, and the AD834ARZ is supplied in an 8-lead SOIC package. Their pin counts, pin functions, and PCB land patterns differ, so they are not footprint-compatible.
What are the supply voltage requirements for the AD8346ARU and AD834ARZ?
The AD8346ARU operates from a single 2.7 V to 5.5 V supply. The AD834ARZ operates from a dual ±4 V to ±9 V supply. The supply architectures are different, so power-supply design must be matched to each part.
Can the AD8346ARU and AD834ARZ be used in the same signal chain?
They serve different roles. The AD8346ARU performs quadrature modulation of baseband I/Q signals to an RF output, while the AD834ARZ performs analog multiplication of two input signals. A design may use them in separate stages, but neither replaces the other's function.
What input and output signal types does each device handle?
The AD8346ARU accepts differential baseband I and Q inputs and produces a single-ended RF output. The AD834ARZ accepts two differential analog voltage inputs (X and Y) and produces a differential current output that is typically converted to voltage externally.
Which device is better suited for direct-conversion transmitter designs?
The AD8346ARU is the appropriate choice for direct-conversion transmitters because it is a dedicated quadrature modulator with I/Q inputs and an RF output covering 0.8 GHz to 2.5 GHz. The AD834ARZ is a general-purpose analog multiplier and is not a quadrature modulator.