Part A
AD9744ARUZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6063 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9740ARU is a functional replacement candidate for the AD9744ARUZ, sharing the same 14-bit resolution, 210 MSPS maximum update rate, 28-lead TSSOP package, and current-output architecture. Designers should validate the lower full-scale output current and reduced SFDR performance of the AD9740ARU against application requirements before substituting.
Resolution
High match
Package Type
High match
Output Current
Validation required
Dynamic Performance
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9744ARUZ | AD9740ARU | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 10 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers far finer quantization than a 10-bit DAC, directly affecting signal fidelity and SFDR. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Update Rate (Max) | 210 MSPS | 210 MSPS | Maximum sample rate defines the highest signal bandwidth the DAC can synthesize; identical rates mean similar throughput capability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both being unbuffered current-output DACs means similar analog front-end design. |
| Supply Voltage | 2.7 V to 3.6 V | 2.7 V to 3.6 V | Supply voltage range must match the system rail; identical ranges allow drop-in compatibility from a power perspective. |
| Package / Case | 28-TSSOP | 28-TSSOP | Package and pinout compatibility is essential for physical substitutability on an existing PCB footprint. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Temperature range determines suitability for industrial vs. commercial environments; matching ranges indicate equivalent environmental robustness. |
| Data Interface | Parallel | Parallel | Interface type must match the digital source; both use a parallel interface, simplifying controller-side substitution. |
| INL / DNL | ±1.5 LSB INL (typ) | ±0.5 LSB INL (typ) | Integral and differential nonlinearity indicate accuracy; the 10-bit part can achieve tighter LSB-referenced linearity, though absolute accuracy differs with resolution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ARUZ | AD9740ARU |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Series | TxDAC® | TxDAC® |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | - |
| Number of D/A Converters | 1 | - |
| Settling Time | 11ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| Data Interface | Parallel | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | - |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | - |
| INL / DNL(LSB) | ±0.8, ±0.5 | - |
| Architecture | Current Source | - |
| Operating Temperature | -40°C ~ 85°C | - |
Frequently asked questions
What are the key differences between the AD9744ARUZ and AD9740ARU?
The AD9744ARUZ is a 14-bit, 210 MSPS TxDAC+ digital-to-analog converter, while the AD9740ARU is a 10-bit, 210 MSPS TxDAC+ DAC. Both are members of the same Analog Devices TxDAC+ family and share a 28-lead TSSOP package (RU suffix), but they differ in resolution (14-bit vs 10-bit) and therefore in INL/DNL, SNR, and SFDR performance specifications.
Are the AD9744ARUZ and AD9740ARU pin-compatible?
Yes. Both devices are offered in the same 28-lead TSSOP (RU-28) package and are pin-compatible within the Analog Devices TxDAC+ family, allowing a common PCB footprint. However, because resolution and dynamic performance differ, the AD9740ARU is not a drop-in functional replacement for the AD9744ARUZ in applications requiring 14-bit accuracy.
What is the maximum update rate of these DACs?
Both the AD9744ARUZ and AD9740ARU are specified for a maximum update rate of 210 MSPS, making them suitable for high-speed communications, instrumentation, and direct digital synthesis applications.
What is the resolution and accuracy difference between the two parts?
The AD9744ARUZ provides 14-bit resolution, while the AD9740ARU provides 10-bit resolution. The higher resolution of the AD9744ARUZ yields finer quantization and better INL/DNL performance, which is important in applications demanding low distortion and high spectral purity.
Do both parts use the same supply voltage and output configuration?
Yes. Both devices operate from a single 3.0 V to 3.6 V supply and provide differential current outputs, consistent with the Analog Devices TxDAC+ architecture. They also share the same digital input interface style and on-chip 1.2 V reference option.
Can the AD9740ARU be used as a lower-cost substitute for the AD9744ARUZ?
Only if the application can tolerate 10-bit resolution instead of 14-bit. The AD9740ARU offers lower resolution and correspondingly reduced dynamic performance, so substitution requires validation of SNR, SFDR, and INL/DNL against the system requirements using the respective Analog Devices datasheets.
Which applications are each part typically suited for?
The AD9744ARUZ (14-bit) is typically used in wideband communications, base stations, and instrumentation where high resolution and low distortion are critical. The AD9740ARU (10-bit) is suited to cost-sensitive, lower-resolution signal generation and control applications where 10-bit accuracy is sufficient.