Part A
AD8130ARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2778 PCS
- Package
- TSSOP-8
- Series
- Linear - Amplificadores - Instrumentação, OP Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The AD8130ARMZ and AD8138AARMZ are not drop-in replacements for one another. Although both are differential amplifiers in the same 8-lead MSOP package, they differ fundamentally in architecture and function: the AD8130 is a high-speed differential receiver/amplifier with a fixed gain of 1 and very high input impedance, while the AD8138 is a low-distortion differential ADC driver with externally settable gain and internal feedback resistors. Their input structures, gain configurations, and output drive characteristics are incompatible, so each must be evaluated against the specific signal-chain requirements rather than substituted directly.
Different amplifier function
Different gain architecture
Different input impedance
Different output drive
Parts at a glance
Part B
AD8138AARMZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5641 PCS
- Package
- TSSOP-8
- Series
- Linear - Amplifiers - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD8130ARMZ | AD8138AARMZ | Why it matters |
|---|---|---|---|
| Amplifier Type | Differential Receiver / Line Driver | Differential ADC Driver | Defines the primary function; a receiver/line driver and an ADC driver are not directly interchangeable in most signal-chain designs. |
| -3 dB Bandwidth | 270 MHz | 320 MHz | Sets the maximum signal frequency the part can pass; affects suitability for high-speed signal paths. |
| Slew Rate | 1090 V/µs | 1150 V/µs | Determines how fast the output can respond to large signal steps; critical for pulse and transient fidelity. |
| Input Voltage Noise Density | 13 nV/√Hz | 5 nV/√Hz | Lower noise improves SNR; the AD8138A is notably quieter, which matters for low-level signal amplification. |
| Supply Voltage Range | ±4.5 V to ±12.6 V (dual) | ±1.4 V to ±5.5 V (dual) | Determines compatibility with the system power rails; the two parts operate in very different supply windows. |
| Supply Current (per amplifier) | 13 mA typ | 20 mA typ | Affects power budget and thermal design; the AD8138A draws more current. |
| Output Swing | Rail-to-rail output | Not rail-to-rail | Rail-to-rail output allows fuller use of the supply range, affecting dynamic range and headroom. |
| Package | 8-Lead MSOP | 8-Lead MSOP | Same footprint allows drop-in PCB compatibility, though electrical differences still prevent direct substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both suit the same environmental conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD8130ARMZ | AD8138AARMZ |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Analog Devices Inc. |
| Part Status | Active | Active |
| Type | - | ADC Driver |
| Applications | - | Data Acquisition |
| Mounting Type | Surface Mount | Surface Mount |
| Amplifier Type | Differential | - |
| Number of Circuits | 1 | - |
| Slew Rate | 1100V/µs | - |
| -3 dB Bandwidth | 290 MHz | - |
| Current - Input Bias | 500 nA | - |
| Voltage - Input Offset | 400 µV | - |
| Supply Current | 13mA | - |
| Current - Output / Channel | 40 mA | - |
| Voltage - Supply Span(Min) | 4.5 V | - |
| Voltage - Supply Span(Max) | 25.2 V | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the primary functional differences between the AD8130ARMZ and AD8138AARMZ?
The AD8130ARMZ is a high-speed differential receiver (single-ended-to-differential converter) with a fixed gain of 1, while the AD8138AARMZ is a low distortion differential ADC driver (differential amplifier) with externally configurable gain. The AD8130ARMZ is optimized for receiving differential signals and converting them to single-ended, whereas the AD8138AARMZ is optimized for driving differential inputs of high-resolution ADCs.
Are the AD8130ARMZ and AD8138AARMZ pin-compatible?
No. Both devices are housed in an 8-lead MSOP (RMZ) package, but their pin functions differ. The AD8130ARMZ pinout includes a REF pin and a PD (power-down) pin, while the AD8138AARMZ pinout includes a VOCM pin and a feedback pin arrangement. They are not direct drop-in replacements for each other.
What are the key AC specifications of the AD8130ARMZ?
The AD8130ARMZ offers a -3 dB bandwidth of 270 MHz (G = +1), a slew rate of 1090 V/µs, and a 0.1% settling time of 20 ns. It also features a low input voltage noise of 6.5 nV/√Hz and a differential gain error of 0.01%.
What are the key AC specifications of the AD8138AARMZ?
The AD8138AARMZ provides a -3 dB bandwidth of 320 MHz (G = +1), a slew rate of 1150 V/µs, and a 0.01% settling time of 16 ns. It features low harmonic distortion of -94 dBc (SFDR) at 5 MHz and a fast overdrive recovery of 8 ns.
Can the AD8130ARMZ be used as an ADC driver?
Yes, the AD8130ARMZ can be used as an ADC driver, but it is primarily designed as a differential receiver. Its fixed gain of 1 and lack of an output common-mode voltage (VOCM) control pin make it less flexible than the AD8138AARMZ for driving ADCs that require precise common-mode level shifting.
Can the AD8138AARMZ be used as a differential receiver?
Yes, the AD8138AARMZ can be configured as a differential receiver, but it is optimized for ADC driving. Its external gain configuration and VOCM pin allow it to be adapted for receiver applications, though the AD8130ARMZ is specifically designed for this function with a fixed gain of 1 and integrated features for receiving differential signals.
What are the power supply requirements for the AD8130ARMZ and AD8138AARMZ?
Both devices operate on dual supplies ranging from ±2.5 V to ±5 V (or single supply 5 V to 10 V). The AD8130ARMZ typically draws 11 mA of supply current, while the AD8138AARMZ draws 14 mA. Both are specified over the -40°C to +85°C industrial temperature range.
Which device is better suited for driving high-resolution ADCs?
The AD8138AARMZ is better suited for driving high-resolution ADCs. It features a dedicated VOCM pin for setting the output common-mode voltage, external gain configuration, and lower harmonic distortion (-94 dBc at 5 MHz), which are critical for maintaining ADC performance. The AD8130ARMZ is optimized for differential signal reception rather than ADC driving.