Part A
AD2S99BPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4512 Stückzahl
- Package
- PLCC-20
- Series
- Clock-Timing mit programmierbaren Timern und Oszillatoren
Replacement verdict
Not a drop-in replacement
The AD2S99BPZ and AD2S90AP are not functionally interchangeable. The AD2S99BPZ is a sinusoidal oscillator designed to generate excitation signals for resolver-based position sensing systems, while the AD2S90AP is a complete resolver-to-digital converter that integrates the excitation drive and conversion functions. Their core functions, pin configurations, and system roles differ fundamentally, making direct substitution impossible without significant redesign.
Different device function
Different output type
Different package type
Different pin configuration
Parts at a glance
Part B
AD2S90AP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9817 Stückzahl
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD2S99BPZ | AD2S90AP | Why it matters |
|---|---|---|---|
| Function | Programmable sinusoidal oscillator (exciter) | Resolver-to-digital converter (R/D converter) | These devices perform fundamentally different functions, so they are not direct substitutes; the oscillator generates the carrier excitation while the converter digitizes resolver signals. |
| Package / Mounting | 20-Lead PLCC (surface mount) | 20-Lead PLCC (surface mount) | Matching package and mounting style allows similar board layout and assembly processes, though the pin functions differ. |
| Supply Voltage | ±5 V (dual supply) | 5 V (single supply) | Different supply requirements affect power design and whether the parts can share the same rail in a system. |
| Output Signal Type | Sinusoidal excitation output | Digital position/velocity data | The output interface determines how each device connects to the rest of the signal chain and whether they can replace one another. |
| Frequency Range | Programmable excitation frequency (kHz range) | Not applicable (converter input tracking) | Excitation frequency must match the resolver and converter specifications for proper system operation. |
| Resolution / Accuracy | Not applicable (oscillator) | 12-bit resolution | Resolution defines the positional accuracy achievable in the digital output, which is critical for motion control. |
| Operating Temperature Range | Industrial temperature range | Industrial temperature range | Both must operate reliably across the same environmental conditions for industrial applications. |
| Primary Application | Resolver excitation in motion control systems | Resolver signal digitization in motion control systems | They are complementary parts in a resolver-based system rather than interchangeable components. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD2S99BPZ | AD2S90AP |
|---|---|---|
| Part Status | Active | Obsolete |
| Type | Oscillator, Sinusoidal | R/D Converter |
| Number of Channels | - | 2 |
| Resolution (Bits) | - | 12 b |
| Data Interface | - | Serial |
| Voltage Supply Source | - | Dual ± |
| Voltage - Supply | ±4.75V ~ 5.25V | ±4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Base Product Number | - | AD2S90 |
| Frequency | 2kHz ~ 20kHz | - |
| Supply Current | 8 mA | - |
Frequently asked questions
What are the AD2S99BPZ and AD2S90AP?
The AD2S99BPZ is an Analog Devices programmable sinusoidal oscillator (also referred to as a sine-wave oscillator) used to generate the carrier excitation signal for resolver-to-digital (R/D) converter systems. The AD2S90AP is an Analog Devices monolithic resolver-to-digital converter that converts resolver sine/cosine signals into digital angle and velocity outputs. They are complementary devices: the AD2S99BPZ provides the excitation carrier, while the AD2S90AP performs the conversion.
Can the AD2S99BPZ and AD2S90AP be used together in a resolver system?
Yes. The AD2S99BPZ is designed to supply the sinusoidal carrier excitation to a resolver, and the AD2S90AP is designed to accept the resolver's sine and cosine feedback signals and produce a digital angle output. Using them together is a typical resolver interface architecture, provided the excitation frequency and signal levels are compatible with the AD2S90AP's specified input requirements.
What is the primary function of the AD2S99BPZ?
The AD2S99BPZ is a programmable sine-wave oscillator that generates a stable sinusoidal excitation signal for resolvers and synchros. Its output frequency and amplitude are programmable via external components, allowing it to match the excitation requirements of a wide range of resolver transducers used in motion-control and position-sensing systems.
What is the primary function of the AD2S90AP?
The AD2S90AP is a resolver-to-digital converter that accepts the sine and cosine signals from a resolver and converts them into a digital representation of shaft angle. It also provides a velocity output. It is used in industrial motor control, robotics, and servo systems where accurate angular position feedback is required.
Are the AD2S99BPZ and AD2S90AP pin-compatible or functionally interchangeable?
No. The AD2S99BPZ is an oscillator that generates an excitation carrier, while the AD2S90AP is a converter that processes resolver feedback signals. They perform different functions, have different pinouts, and are not interchangeable. Each is used in a distinct role within a resolver signal chain.
What package types are used for the AD2S99BPZ and AD2S90AP?
The AD2S99BPZ is supplied in a 20-lead plastic DIP (PDIP) package. The AD2S90AP is supplied in a 20-lead plastic leaded chip carrier (PLCC) package. Because the packages differ, PCB footprint and assembly requirements differ between the two devices.
Do the AD2S99BPZ and AD2S90AP require external components for operation?
Yes. The AD2S99BPZ requires external passive components to program its output frequency and amplitude. The AD2S90AP requires external components for its reference and signal conditioning, and its digital interface typically requires pull-up or interface circuitry depending on the system design. Exact values and configurations should be taken from the respective manufacturer datasheets.
Which device should be selected for a new resolver interface design?
Selection depends on the system architecture. If the design requires a programmable excitation source for a resolver, the AD2S99BPZ is the appropriate choice. If the design requires conversion of resolver sine/cosine signals to digital angle and velocity, the AD2S90AP is the appropriate choice. In many systems both functions are needed, and the two devices can be used together. Final selection should be based on verified datasheet specifications and the target application requirements.