Part A
AD9744ACPZRL7
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2452 PCS
- Package
- LFCSP-32
- Series
- Data Acquisition - Digital to Analog Converters (DAC)
Replacement verdict
Not a drop-in replacement
The AD9744ACPZRL7 and AD9745BCPZRL are not drop-in replacements for one another. Although both are 14-bit high-speed DACs from the same Analog Devices TxDAC family, they differ in channel count, output architecture, and package footprint, so a direct board-level substitution is not possible without design changes.
Different channel count
Different output architecture
Different package footprint
Different pin configuration
Parts at a glance
Part B
AD9745BCPZRL
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9224 PCS
- Package
- VFQFN-72
- Series
- Data Acquisition - 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 | AD9744ACPZRL7 | AD9745BCPZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 12 bit | Resolution determines the number of discrete output levels; a 14-bit DAC offers finer amplitude control and lower quantization noise than a 12-bit DAC, affecting achievable signal fidelity. |
| Number of DAC Channels | 1 | 2 | Channel count defines how many independent analog outputs are available; a dual-channel DAC can drive two signal paths (e.g., I/Q) from one package, while a single-channel part requires two devices. |
| Maximum Update Rate | 210 MSPS | 250 MSPS | The update rate sets the maximum sample clock and usable output bandwidth; higher rates support wider signal bandwidths and higher intermediate frequencies in transmit applications. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture determines the external interface circuitry required; unbuffered current-output DACs need an external load/transformer or op-amp to convert current to voltage. |
| Supply Voltage | 3.0 V to 3.6 V | 1.8 V to 3.6 V | Supply range affects compatibility with the surrounding digital and analog rails; a wider low-voltage range enables lower-power system designs and direct interfacing with low-voltage logic. |
| Package / Case | 32-LFCSP (5x5) | 40-LFCSP (6x6) | Package footprint and pin count affect PCB layout, thermal performance, and whether the parts are drop-in compatible on an existing board. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | The temperature range indicates the environments in which the device is guaranteed to meet specifications, critical for industrial and outdoor equipment. |
| Interface | Parallel | Parallel | The digital input interface determines how the DAC connects to the data source; parallel interfaces offer high throughput but consume more pins than serial alternatives. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9744ACPZRL7 | AD9745BCPZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 14 | 12 |
| Number of D/A Converters | 1 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.7V ~ 1.9V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±0.8, ±0.5 | ±0.25, ±0.13 |
| Architecture | Current Source | Quad-Switch |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | TxDAC® | - |
| Settling Time | 11ns (Typ) | - |
Frequently asked questions
What are the key differences between the AD9744ACPZRL7 and the AD9745BCPZRL?
The AD9744ACPZRL7 is a 14-bit, 210 MSPS TxDAC digital-to-analog converter, while the AD9745BCPZRL is a 12-bit, 250 MSPS dual-channel TxDAC. The AD9744 offers higher resolution in a single-channel configuration, whereas the AD9745 provides two DAC channels with a higher maximum update rate but lower resolution.
Do the AD9744ACPZRL7 and AD9745BCPZRL use the same package and pinout?
No. The AD9744ACPZRL7 is supplied in a 32-lead LFCSP (CP-32-2) package, and the AD9745BCPZRL is supplied in a 40-lead LFCSP (CP-40-1) package. The different package sizes and pin counts mean the PCB land patterns and pin assignments are not interchangeable.
What are the resolution and sample rate specifications of each device?
The AD9744ACPZRL7 provides 14-bit resolution with a maximum update rate of 210 MSPS. The AD9745BCPZRL provides 12-bit resolution per channel with a maximum update rate of 250 MSPS. These figures are specified in the respective Analog Devices datasheets.
How many DAC channels does each part provide?
The AD9744ACPZRL7 is a single-channel DAC. The AD9745BCPZRL is a dual-channel DAC, making it suitable for applications requiring two synchronized analog outputs such as I/Q signal generation.
What is the supply voltage and typical power consumption of these DACs?
Both devices operate from a single 1.8 V to 3.3 V analog and digital supply. The AD9744ACPZRL7 typically consumes about 135 mW at 3.3 V, while the AD9745BCPZRL typically consumes about 330 mW at 3.3 V for both channels, per the Analog Devices datasheets.
Can the AD9744ACPZRL7 be used as a drop-in replacement for the AD9745BCPZRL?
No. The two parts differ in resolution (14-bit vs 12-bit), channel count (single vs dual), package (32-lead vs 40-lead LFCSP), and pinout. A direct drop-in replacement is not possible; any substitution requires a redesign validated against the Analog Devices datasheets.
What are the typical applications for each device?
The AD9744ACPZRL7 is typically used in single-channel applications such as base station transmit paths, instrumentation, and direct digital synthesis. The AD9745BCPZRL is typically used in dual-channel applications such as I/Q modulation, quadrature transmitters, and dual-channel arbitrary waveform generation.
What digital interface do these DACs use?
Both the AD9744ACPZRL7 and AD9745BCPZRL use a parallel CMOS-compatible input interface for loading digital data. The AD9745BCPZRL provides separate input ports for its two channels, while the AD9744ACPZRL7 has a single parallel input port, as specified in the Analog Devices datasheets.