Part A
AD9240ASZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2617 Stückzahl
- Package
- QFP-44
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD9243ASZRL and AD9240ASZRL are functionally comparable 14-bit analog-to-digital converters sharing the same package, pinout, and supply architecture, making the AD9243ASZRL a viable replacement candidate for the AD9240ASZRL in many designs. The primary distinction is conversion speed, so designers should confirm that the higher sampling rate and associated timing margins align with their system requirements before substituting.
Resolution
High match
Package Type
High match
Supply Voltage
High match
Sampling Rate
Validation required
Parts at a glance
Part B
AD9243ASZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3059 Stückzahl
- Package
- QFP-44
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9243ASZRL | AD9240ASZRL | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 14 bit | Both converters provide 14-bit resolution, so quantization noise floor and dynamic range are comparable for a given input span. |
| Sampling Rate | 3 MSPS | 10 MSPS | The maximum conversion rate determines the usable input bandwidth and whether the part can support higher-speed signal chains; the AD9240 supports over three times the throughput. |
| Input Type | Differential | Differential | Differential inputs improve common-mode rejection and distortion performance, and both parts share this architecture for similar analog front-end design. |
| Supply Voltage | 5 V | 5 V | A single 5 V analog supply simplifies power design and ensures both parts are compatible with the same board-level power rail. |
| Power Consumption | 90 mW | 300 mW | Lower power dissipation reduces thermal load and supply current requirements; the AD9243 is significantly more power-efficient at its lower sample rate. |
| SNR | 79 dB | 77.5 dB | Signal-to-noise ratio directly affects the effective number of bits and measurement accuracy in the target application. |
| SFDR | 91 dBc | 90 dBc | Spurious-free dynamic range indicates how well the converter preserves small signals in the presence of large interferers, important for spectral and imaging applications. |
| Package / Case | 44-Lead MQFP | 44-Lead MQFP | Identical package and pinout allow a drop-in footprint change on an existing PCB layout. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Matching industrial temperature ranges ensure both parts meet the same environmental qualification requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9240ASZRL | AD9243ASZRL |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 10M | 3M |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Pipelined | Pipelined |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -55°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9243ASZRL and AD9240ASZRL?
The AD9243ASZRL is a 14-bit, 3 MSPS analog-to-digital converter, while the AD9240ASZRL is a 14-bit, 10 MSPS ADC. Both are pin-compatible members of the AD924x family in a 44-lead MQFP package, but the AD9240 offers a higher maximum sampling rate and correspondingly higher power consumption than the AD9243.
Are the AD9243ASZRL and AD9240ASZRL pin-compatible?
Yes. Both devices are offered in the same 44-lead MQFP (MQFP-44) package and belong to the same AD924x converter family, sharing a common pinout. This allows a single PCB layout to accommodate either device, though the higher sampling rate of the AD9240ASZRL should be considered for layout and decoupling.
What is the maximum sampling rate of each device?
The AD9243ASZRL has a maximum sampling rate of 3 MSPS, while the AD9240ASZRL supports a maximum sampling rate of 10 MSPS. Designs requiring higher throughput should select the AD9240ASZRL, provided the rest of the signal chain supports the increased rate.
Do both converters have the same resolution and output format?
Yes. Both the AD9243ASZRL and AD9240ASZRL are 14-bit ADCs that provide a parallel CMOS-compatible output. Resolution and digital output interface are therefore identical, so the primary selection criteria are sampling rate, power, and dynamic performance.
How does power consumption compare between the two parts?
The AD9243ASZRL typically consumes about 90 mW at 3 MSPS, whereas the AD9240ASZRL typically consumes about 300 mW at 10 MSPS. The higher power of the AD9240ASZRL reflects its higher sampling rate; lower-power or portable designs may favor the AD9243ASZRL.
What is the analog input range and supply voltage for these ADCs?
Both devices operate from a single 5 V analog supply and a 3 V to 5 V digital supply, and both feature a differential analog input with a nominal 2 V p-p full-scale range. The input architecture and reference requirements are common across the AD924x family.
Can the AD9243ASZRL be used as a drop-in replacement for the AD9240ASZRL?
Because they share the same package and pinout, the AD9243ASZRL can physically replace the AD9240ASZRL, but it will reduce the maximum sampling rate from 10 MSPS to 3 MSPS. The replacement should only be made after confirming that the system's timing, clocking, and throughput requirements are satisfied at the lower rate.
What are the typical applications for each converter?
The AD9243ASZRL is suited to lower-power, moderate-speed applications such as portable instrumentation and medical imaging front ends, while the AD9240ASZRL targets higher-throughput systems such as communications receivers, video digitizing, and high-speed data acquisition where 10 MSPS is required.