Part A
AD8367ARU
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7020 PCS
- Package
- TSSOP-14
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Replacement verdict
Compatible functional replacement candidate
The AD8369ARUZ and AD8367ARU are both digitally controlled variable gain amplifiers from Analog Devices in the same TSSOP-16 package, sharing a similar broadband signal-chain role. However, they are not identical drop-in substitutes: the AD8367ARU offers a higher maximum gain and a different gain-control interface, while the AD8369ARUZ provides a parallel digital gain-control bus. Designers should validate gain range, control interface, and supply/bandwidth requirements against the target application before substituting one for the other.
Gain Control Interface
Validation required
Gain Range
Validation required
Package Type
High match
Bandwidth
Validation required
Parts at a glance
Part B
AD8369ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4576 PCS
- Package
- TSSOP-16
- Series
- Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8369ARUZ | AD8367ARU | Why it matters |
|---|---|---|---|
| Function Type | Digitally controlled variable gain amplifier (VGA) | Analog-controlled variable gain amplifier (VGA) | Determines the control interface: digital SPI-style gain steps versus continuous analog gain control, which affects system architecture and substitutability. |
| Frequency Range | Up to 600 MHz | Up to 500 MHz | Defines the operating bandwidth; a part with insufficient bandwidth cannot replace one covering a higher frequency band. |
| Gain Control Range | -10 dB to +35 dB (45 dB range) | -2.5 dB to +42.5 dB (45 dB range) | Sets the dynamic range available for signal level adjustment; different absolute gain windows affect link budget and AGC design. |
| Gain Control Interface | 3-bit parallel digital (SPI-compatible latch) | Analog voltage (0 V to 1 V) | Dictates how the host controls gain; digital control suits microcontroller-driven AGC, while analog control suits continuous feedback loops. |
| Gain Step Size | 3 dB per step (16 steps) | Continuous (analog) | Discrete steps simplify calibration and repeatability, while continuous control offers finer resolution but requires more careful loop design. |
| Output IP3 (OIP3) | Approximately +19 dBm at 70 MHz | Approximately +20 dBm at 70 MHz | Indicates linearity and distortion performance; higher OIP3 supports larger signals before compression, affecting dynamic range in receiver chains. |
| Noise Figure | Approximately 7 dB at maximum gain | Approximately 6.5 dB at maximum gain | Sets the sensitivity floor of the signal chain; lower noise figure improves weak-signal reception and overall receiver performance. |
| Supply Voltage | 5 V single supply | 5 V single supply | Confirms power-rail compatibility; matching supply requirements simplifies direct board-level substitution. |
| Package | 16-lead TSSOP | 14-lead TSSOP | Different pin counts and footprints mean the parts are not drop-in replacements and require PCB layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Ensures both parts meet the same environmental requirements for industrial and commercial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8367ARU | AD8369ARUZ |
|---|---|---|
| Series | X-AMP® | X-AMP® |
| Part Status | Obsolete | Active |
| Amplifier Type | Variable Gain | Variable Gain |
| Number of Circuits | 1 | 1 |
| -3 dB Bandwidth | 500 MHz | 600 MHz |
| Current - Input Bias | 27 µA | 160 µA |
| Supply Current | 26mA | 37mA |
| Voltage - Supply Span(Min) | 2.7 V | 3 V |
| Voltage - Supply Span(Max) | 5.5 V | 5.5 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Slew Rate | - | 1200V/µs |
Frequently asked questions
What are the primary functional differences between the AD8369ARUZ and the AD8367ARU?
The AD8369ARUZ is a digitally controlled variable gain amplifier (VGA) with a gain range of -5 dB to +40 dB, controlled via a 4-bit parallel or SPI-compatible serial interface, and operates from a single 5 V supply. The AD8367ARU is an analog-controlled VGA with a gain range of -2.5 dB to +42.5 dB, controlled by an analog voltage on its GAIN pin, and operates from a single 5 V supply. The AD8369ARUZ is intended for digitally programmed gain applications, while the AD8367ARU is intended for continuously variable analog gain control.
Are the AD8369ARUZ and AD8367ARU pin-compatible?
No. Both devices are offered in a 20-lead TSSOP package (RU suffix), but their pin functions differ. The AD8369ARUZ uses pins for a 4-bit parallel gain control bus (or SPI serial interface) and associated control lines, whereas the AD8367ARU uses a single analog GAIN pin plus a MODE pin for gain slope selection. Because the control pin assignments and functions differ, the two devices are not directly pin-compatible and require different PCB routing for gain control.
Can the AD8369ARUZ be used as a drop-in replacement for the AD8367ARU in an existing design?
No, not as a drop-in replacement. Although both are 20-lead TSSOP VGAs operating from a 5 V supply, the gain control interfaces differ (digital 4-bit/SPI for the AD8369ARUZ versus analog voltage for the AD8367ARU), and the pin functions are not identical. A replacement requires redesigning the gain control circuitry and verifying the PCB layout against the respective datasheet pinouts.
What is the gain control range and resolution of each device?
The AD8369ARUZ provides a gain range of -5 dB to +40 dB (45 dB span) with 4-bit digital control, giving 16 gain steps of approximately 3 dB each. The AD8367ARU provides a gain range of -2.5 dB to +42.5 dB (45 dB span) with continuous analog control via the GAIN pin, with a gain slope of 50 dB/V in its default mode.
How do the noise figure and distortion performance compare between the AD8369ARUZ and AD8367ARU?
Both devices are specified with similar noise figure performance at maximum gain (approximately 7 dB to 8 dB typical at 70 MHz to 140 MHz, depending on frequency and gain setting), and both are specified for output third-order intercept (OIP3) in the range of approximately +20 dBm to +24 dBm at typical operating frequencies. Exact values depend on frequency, gain setting, and supply voltage, so the respective datasheets should be consulted for the specific operating condition.
What supply voltage and power consumption do the AD8369ARUZ and AD8367ARU require?
Both devices operate from a single 5 V supply. The AD8369ARUZ typically draws approximately 40 mA to 45 mA, while the AD8367ARU typically draws approximately 25 mA to 30 mA, depending on operating conditions. Both are specified for the industrial temperature range of -40 °C to +85 °C.
Which device is better suited for automatic gain control (AGC) loops?
The AD8367ARU is generally better suited for analog AGC loops because its continuous analog GAIN pin allows smooth, continuous gain adjustment and it includes an on-chip square-law detector output that can be used to close an AGC loop. The AD8369ARUZ, with its 4-bit digital gain steps, is better suited for digitally programmed gain applications where discrete gain settings are acceptable or where a microcontroller/SPI interface is preferred.
What are the key application differences between the AD8369ARUZ and AD8367ARU?
The AD8369ARUZ is typically used in applications requiring digitally programmable gain, such as software-defined radio receive chains, digital predistortion, and instrumentation where gain is set by a microcontroller or DSP via SPI or parallel control. The AD8367ARU is typically used in analog AGC systems, continuous-wave receivers, and RF/IF chains where a continuously variable analog gain control voltage is available, such as in cellular base station receivers and analog signal processing paths.