Part A
AD9755ASTZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7867 PCS
- Series
- Acquisição de dados - Convertedores digitais para analógicos (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9755ASTZRL is a viable functional replacement candidate for the AD9753ASTZ, sharing the same 14-bit resolution, 48-LQFP package, and high-speed current-output DAC architecture. Designers should validate the higher maximum update rate and increased power consumption against their specific application requirements before finalizing the substitution.
Resolution
High match
Package Type
High match
Maximum Update Rate
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
AD9753ASTZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4116 PCS
- Package
- LQFP-48
- Series
- Acquisição de dados - Convertedores digitais para analógicos (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 | AD9753ASTZ | AD9755ASTZRL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Higher resolution reduces quantization error and improves dynamic performance, so the two parts are not directly interchangeable in precision-sensitive designs. |
| Number of DAC Channels | 1 | 1 | Both are single-channel DACs, so channel count does not differentiate them for substitutability. |
| Sampling Rate (Max) | 300 MSPS | 300 MSPS | Matching maximum update rates allow either part to support the same signal bandwidth in high-speed transmit paths. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Identical current-output architecture means the same external output network and termination can be reused. |
| Supply Voltage (Analog/Digital) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Same supply range allows drop-in use on the same 3.3 V rail without regulator changes. |
| Package / Case | 48-LQFP | 48-LQFP | Identical package and pinout enable physical board-level interchangeability. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same industrial temperature range means both parts suit the same environmental conditions. |
| Interface | Parallel | Parallel | Matching parallel input interface allows the same digital driver and timing to be used. |
| INL / DNL Linearity | ±0.5 LSB INL (typ) | ±1.0 LSB INL (typ) | Different linearity specifications affect static accuracy and spectral purity, which matters for high-fidelity signal synthesis. |
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 | AD9755ASTZRL | AD9753ASTZ |
|---|---|---|
| Series | TxDAC+® | TxDAC+® |
| Part Status | Discontinued at Digi-Key | Active |
| Number of Bits | 14 | 12 |
| Number of D / A Converters | 1 | - |
| Settling Time | 11ns (Typ) | 11ns (Typ) |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 3V ~ 3.6V | 3V ~ 3.6V |
| Voltage - Supply, Digital | 3V ~ 3.6V | 3V ~ 3.6V |
| INL / DNL (LSB) | ±2.5, ±1.5 | - |
| Architecture | Current Source | Current Source |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | - |
| Base Product Number | AD9755 | - |
| Number of D/A Converters | - | 1 |
| INL / DNL(LSB) | - | ±0.5, ±0.4 |
Frequently asked questions
What are the key differences between the AD9753ASTZ and AD9755ASTZRL?
Both are dual-channel, 14-bit high-speed DACs from Analog Devices in a 48-lead LQFP package. The AD9753ASTZ is specified for a 125 MSPS update rate, while the AD9755ASTZRL is specified for a 300 MSPS update rate. The AD9755ASTZRL also integrates an on-chip 2x/4x/8x interpolating filter and a digital modulator, whereas the AD9753ASTZ does not include these digital signal processing features. The "RL" suffix on AD9755ASTZRL denotes tape-and-reel packaging.
Are the AD9753ASTZ and AD9755ASTZRL pin-compatible?
Both devices are offered in the same 48-lead LQFP (ST-48) package, but pin compatibility must be confirmed against the respective datasheets because the AD9755ASTZRL exposes additional digital control and interpolation-related pins that the AD9753ASTZ does not use. A direct drop-in substitution should not be assumed without verifying the pin function assignments in both datasheets.
What is the maximum update rate of each device?
The AD9753ASTZ is specified for a maximum update rate of 125 MSPS. The AD9755ASTZRL is specified for a maximum update rate of 300 MSPS. Designs requiring higher sample rates should select the AD9755ASTZRL, provided the rest of the signal chain supports the higher rate.
Do both parts include on-chip interpolation filters?
No. The AD9755ASTZRL integrates a selectable 2x, 4x, or 8x interpolating filter along with a digital modulator, which allows it to accept lower input data rates and upconvert internally. The AD9753ASTZ does not include on-chip interpolation and accepts data at the DAC update rate.
What is the resolution and channel count of these DACs?
Both the AD9753ASTZ and AD9755ASTZRL are dual-channel (two DACs per package) 14-bit digital-to-analog converters. The 14-bit resolution and dual-channel architecture are common to both devices, so selection between them is driven by update rate, interpolation features, and power considerations rather than resolution.
What package and packaging options are used for these parts?
Both devices are supplied in a 48-lead LQFP package. The AD9753ASTZ is provided in tray or standard tube packaging, while the AD9755ASTZRL suffix indicates tape-and-reel packaging intended for automated assembly. The package body and lead count are the same, but the packaging format differs.
Can the AD9753ASTZ be replaced by the AD9755ASTZRL in an existing design?
Not as a direct drop-in replacement without validation. Although both are 14-bit dual DACs in a 48-lead LQFP, the AD9755ASTZRL supports a higher update rate and includes interpolation and modulation features that require different clocking and digital input configurations. The design must be reviewed against the AD9755ASTZRL datasheet for pin functions, clock requirements, and digital interface timing before substitution.
Which device is better suited for high-speed signal synthesis applications?
The AD9755ASTZRL is better suited for high-speed signal synthesis because its 300 MSPS update rate and on-chip 2x/4x/8x interpolation support higher output frequencies and simplified digital input rates. The AD9753ASTZ, at 125 MSPS without interpolation, is appropriate for lower-rate dual-channel DAC applications where the additional digital processing is not required.