Part A
AD9516-4BCPZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 1951 個数
- Package
- LFCSP-64
- Series
- クロックタイミング - クロックジェネレータ、PLL、周波数シンセサイザ
Replacement verdict
Not a drop-in replacement
The AD9515BCPZ and AD9516-4BCPZ are not functionally interchangeable despite sharing the same Analog Devices clock distribution family and LFCSP package style. The AD9515BCPZ is a dual-output clock fanout buffer with LVPECL and LVDS outputs, while the AD9516-4BCPZ is a fully integrated clock generator with an on-chip VCO, four outputs, and PLL functionality. Their channel count, output configuration, integrated PLL/VCO architecture, and control interface differ fundamentally, so the AD9516-4BCPZ cannot directly replace the AD9515BCPZ in an existing design without significant rework.
Different output type
Different channel count
Different integrated PLL/VCO
Different control interface
Parts at a glance
Part B
AD9515BCPZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7068 個数
- Package
- LFCSP-32
- Series
- クロックタイミング - クロックバッファ、ドライバ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9515BCPZ | AD9516-4BCPZ | Why it matters |
|---|---|---|---|
| Function / Device Type | Clock fanout buffer / divider (2 outputs) | Clock generator with integrated VCO and PLL (multi-output) | Defines the core role of the part; a buffer/divider cannot replace a full clock generator with PLL/VCO in most designs. |
| Number of Outputs | 2 | 6 (LVPECL and LVDS/CMOS combinations) | Output count determines how many clock loads can be driven; fewer outputs may require additional fanout buffers. |
| Integrated VCO | No | Yes (on-chip VCO) | An integrated VCO eliminates an external oscillator and simplifies clock generation; its absence changes the entire system architecture. |
| Integrated PLL | No | Yes (integer-N PLL with programmable dividers) | A PLL allows frequency synthesis and synchronization to a reference; without it, only buffering/dividing of an existing clock is possible. |
| Output Logic Levels | LVPECL / LVDS (selectable) | LVPECL, LVDS, and CMOS | Logic level compatibility with downstream devices is essential; missing a required standard forces level translation. |
| Maximum Output Frequency | 1.6 GHz (LVPECL) | 1.6 GHz (LVPECL) | Sets the upper limit of clock rates the device can distribute; both meet similar high-speed needs but the generator adds synthesis. |
| Package | 32-lead LFCSP (5 mm x 5 mm) | 64-lead LFCSP (9 mm x 9 mm) | Footprint and pin count differ significantly, so PCB layout and routing cannot be reused directly between the two parts. |
| Supply Voltage | 3.3 V (2.375 V to 3.465 V) | 3.3 V (3.135 V to 3.465 V) | Operating voltage range affects power supply design and compatibility with surrounding rails. |
| On-Chip Divider Range | Programmable dividers (1 to 32) | Programmable dividers with wider range and multiple stages | Divider flexibility determines achievable output frequencies from a given input; the generator offers more synthesis options. |
| Typical Application | Clock distribution / fanout in data converters and networking | Clock generation and distribution for ADCs/DACs, wireless and instrumentation | Application fit indicates substitutability; the generator serves as a system clock source while the buffer only distributes an existing clock. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9516-4BCPZ | AD9515BCPZ |
|---|---|---|
| Part Status | Active | Active |
| Type | Clock Generator, Fanout Distribution | Fanout Buffer (Distribution), Divider |
| PLL | Yes | - |
| Input | Clock | Clock |
| Output | CMOS, LVDS, LVPECL | CMOS, LVDS, LVPECL |
| Number of Circuits | 1 | 1 |
| Ratio - Input: Output | 1:14 | 1:2 |
| Differential - Input: Output | Yes/Yes | Yes/Yes |
| Frequency - Max | 2.95GHz | 1.6 GHz |
| Divider / Multiplier | Yes/No | - |
| Voltage - Supply | 3.135V ~ 3.465V | 3.135V ~ 3.465V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary functional differences between the AD9515BCPZ and the AD9516-4BCPZ?
The AD9515BCPZ is a 1.6 GHz clock distribution IC featuring a divide-by-2 prescaler, two LVPECL outputs, and two CMOS outputs. The AD9516-4BCPZ is a more highly integrated clock generator and distribution IC that includes an on-chip integer-N PLL and VCO, along with multiple LVPECL, LVDS, and CMOS outputs. In short, the AD9516-4BCPZ integrates frequency synthesis, while the AD9515BCPZ is a fanout/distribution buffer without an integrated PLL or VCO.
Do the AD9515BCPZ and AD9516-4BCPZ use the same package and pinout?
No. The AD9515BCPZ is supplied in a 32-lead LFCSP package, while the AD9516-4BCPZ is supplied in a 64-lead LFCSP package. Because the package sizes and pin counts differ, the two devices are not pin-compatible and cannot be dropped into the same PCB land pattern.
Can the AD9515BCPZ and AD9516-4BCPZ operate from the same supply voltage?
Both devices are specified for a 3.3 V nominal supply. However, the AD9516-4BCPZ includes additional internal blocks (PLL, VCO, and reference input circuitry) that may impose different supply current and decoupling requirements. Designers should consult the respective datasheets for exact supply current, power dissipation, and recommended decoupling before sharing a rail.
Which device should be selected when an integrated PLL and VCO are required?
The AD9516-4BCPZ should be selected when an on-chip integer-N PLL and VCO are needed, as it integrates frequency synthesis with clock distribution. The AD9515BCPZ does not contain a PLL or VCO and is intended for clock fanout and division from an externally provided clock source.
How do the output types and quantities differ between the two devices?
The AD9515BCPZ provides two LVPECL outputs and two CMOS outputs. The AD9516-4BCPZ provides multiple LVPECL and LVDS outputs plus CMOS outputs, with the exact count and configuration defined in its datasheet. The AD9516-4BCPZ therefore offers greater output flexibility and higher output count for multi-clock systems.
Are the AD9515BCPZ and AD9516-4BCPZ interchangeable in an existing design?
No. The devices differ in package size, pin count, internal architecture (presence or absence of PLL/VCO), and output configuration. A direct substitution is not possible without redesigning the PCB land pattern, revalidating the clock tree, and confirming supply, decoupling, and output requirements against the manufacturer datasheets.
What is the maximum output frequency capability of each device?
The AD9515BCPZ supports clock distribution up to 1.6 GHz. The AD9516-4BCPZ output frequency range depends on its integrated VCO and divider settings, and designers should verify the specific maximum output frequency from the AD9516-4 datasheet for the intended output standard and configuration.