Part A
AD9746BCPZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4643 Stückzahl
- Package
- LFCSP-72
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9746BCPZ and AD9745BCPZRL are functionally compatible dual-channel 16-bit and 12-bit TxDAC converters in the same 72-lead LFCSP package with identical pinout, supply, and interface characteristics, making them viable replacement candidates where the 12-bit resolution of the AD9745BCPZRL meets the application's dynamic performance requirements. Designers should validate resolution-dependent metrics such as SNR, SFDR, and INL against system specifications before substituting.
Resolution
High match
Package Type
High match
Pin Configuration
High match
Dynamic Performance
Validation required
Parts at a glance
Part B
AD9745BCPZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9224 Stückzahl
- Package
- VFQFN-72
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9746BCPZ | AD9745BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the number of discrete output levels; a 16-bit DAC offers finer amplitude control and lower quantization noise than a 12-bit DAC, so they are not functionally interchangeable in precision applications. |
| Number of DAC Channels | 2 | 2 | Both are dual-channel DACs, so the channel count matches and does not limit substitutability. |
| Maximum Update Rate | 250 MSPS | 250 MSPS | Sample rate defines the maximum signal bandwidth the DAC can synthesize; identical rates mean comparable dynamic performance for high-speed signal generation. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Current-output DACs require an external transimpedance stage; matching output topology ensures the same analog front-end design can be reused. |
| Supply Voltage | 3.13 V to 3.47 V | 3.13 V to 3.47 V | Compatible supply rails allow the same power design and decoupling to be used for either part. |
| Package / Case | 32-VFQFN Exposed Pad, CSP | 32-VFQFN Exposed Pad, CSP | Identical package and footprint enable drop-in board replacement without layout changes. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensure equivalent environmental robustness in the target application. |
| Data Interface | Parallel | Parallel | The same parallel input interface means the digital host and timing can drive either device without protocol changes. |
| INL / DNL Linearity | ±4 LSB INL (typical) | ±0.5 LSB INL (typical) | Linearity error affects signal fidelity; the 12-bit part specifies tighter LSB-referenced INL, but absolute accuracy differs because LSB size scales with resolution, so performance is not directly equivalent. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9746BCPZ | AD9745BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 2 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V, 3.13V ~ 3.47V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±1, ±0.5 | ±0.25, ±0.13 |
| Architecture | Quad-Switch | Quad-Switch |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9746BCPZ and the AD9745BCPZRL?
The AD9746BCPZ is a dual 14-bit, 250 MSPS digital-to-analog converter (DAC), while the AD9745BCPZRL is a dual 12-bit, 250 MSPS DAC. Both are members of the Analog Devices AD974x family, pin-compatible in the same 72-lead LFCSP package, but the AD9746 offers 14-bit resolution versus the 12-bit resolution of the AD9745. The "RL" suffix on AD9745BCPZRL indicates tape-and-reel packaging, whereas AD9746BCPZ is supplied in a tray.
Are the AD9746BCPZ and AD9745BCPZRL pin-compatible and package-compatible?
Yes. Both devices are offered in the same 72-lead LFCSP (CP-72-2) package with identical pinout assignments, allowing a common PCB footprint. This pin compatibility enables designers to migrate between the 12-bit AD9745 and 14-bit AD9746 without redesigning the board layout, provided the system timing and interface requirements are met.
Do the AD9746BCPZ and AD9745BCPZRL share the same sample rate and interface?
Yes. Both DACs support a maximum update rate of 250 MSPS and feature a dual-port, interleaved LVDS input data interface. They also share the same on-chip 1.2 V reference, analog output architecture, and SPI control interface, so the digital timing and control scheme is common to both parts.
What is the difference in dynamic performance between the 14-bit AD9746BCPZ and the 12-bit AD9745BCPZRL?
The AD9746BCPZ, with 14-bit resolution, provides finer quantization and therefore lower quantization noise, yielding better spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) than the 12-bit AD9745BCPZRL at a given output frequency. Designers should consult the respective datasheets for the specific SFDR and SNR values at their target output frequency and sample rate, as performance is frequency-dependent.
Can the AD9745BCPZRL be used as a drop-in replacement for the AD9746BCPZ in an existing design?
Because the two parts are pin-compatible and share the same package and interface, the AD9745BCPZRL can be placed on a board designed for the AD9746BCPZ. However, it is not a functional equivalent: the AD9745 provides only 12-bit resolution versus 14 bits, so the system's effective dynamic range and quantization performance will be reduced. The replacement should only be made after validating that the lower resolution meets the application's performance requirements.
What are the packaging and ordering differences between AD9746BCPZ and AD9745BCPZRL?
The AD9746BCPZ is supplied in a tray (the "Z" denotes RoHS-compliant lead-free construction). The AD9745BCPZRL is supplied in tape-and-reel format ("RL" suffix), which is intended for high-volume automated assembly. Both are RoHS-compliant and use the same 72-lead LFCSP package; the difference is solely the shipping/packaging format and the resolution grade.
Do both devices operate from the same supply voltages and power levels?
Yes. Both the AD9746BCPZ and AD9745BCPZRL operate from a 1.8 V digital supply and a 3.3 V analog supply, with the same on-chip reference and output architecture. Total power consumption is similar between the two parts because they share the same core design and sample rate; the primary differentiator is resolution (14-bit vs 12-bit), not the supply or power envelope.