Part A
AFE5809ZCF
Texas Instruments
- Lifecycle
- Active
- Stock
- 5909 PCS
- Package
- NFBGA-135
- Series
- Data Acquisition - Analog Front End (AFE)
Replacement verdict
Compatible functional replacement candidate
The AFE5818ZBV and AFE5809ZCF are both highly integrated octal-channel ultrasound analog front ends from Texas Instruments, sharing a common architecture, supply scheme, and digital interface that make them strong functional replacement candidates. However, the AFE5818ZBV offers a higher maximum sampling rate and a different package footprint than the AFE5809ZCF, so board-level validation of timing margins, thermal performance, and layout compatibility is required before committing to a drop-in substitution.
Channel Count
High match
Supply Voltage Architecture
High match
Maximum Sampling Rate
Validation required
Package Type
Validation required
Parts at a glance
Part B
AFE5818ZBV
Texas Instruments
- Lifecycle
- Active
- Stock
- 4837 PCS
- Package
- NFBGA-289
- Series
- Data Acquisition - Analog Front End (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AFE5818ZBV | AFE5809ZCF | Why it matters |
|---|---|---|---|
| Number of Channels | 16 | 8 | Channel count determines how many transducer elements can be processed simultaneously, directly affecting system density and the number of AFEs required per design. |
| ADC Resolution | 14 bit | 14 bit | Resolution sets the dynamic range and quantization noise floor of the receive path, which is critical for image quality in ultrasound systems. |
| Maximum ADC Sampling Rate | 65 MSPS | 65 MSPS | Sampling rate limits the maximum signal bandwidth and depth resolution achievable in the imaging chain. |
| LNA Gain Range | 24 dB | 24 dB | Low-noise amplifier gain range affects sensitivity to weak echoes and overall receive chain dynamic range. |
| Integrated CW Doppler | Yes | Yes | Continuous-wave Doppler support enables blood flow velocity measurement, a key clinical feature in ultrasound systems. |
| Package | NFBGA (ZBV) | NFBGA (ZCF) | Package footprint and pinout determine PCB layout compatibility and whether a drop-in replacement is possible. |
| Supply Voltage | 1.8 V / 3.3 V | 1.8 V / 3.3 V | Supply rails must match the board power architecture; mismatches require regulator or level-shifting changes. |
| Power Consumption per Channel | ~150 mW | ~150 mW | Per-channel power drives thermal design and battery life in portable ultrasound systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AFE5809ZCF | AFE5818ZBV |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 14 | 14 |
| Number of Channels | 8 | 16 |
| Power (Watts) | 158 mW | 140 mW |
| Voltage - Supply, Analog | 1.7V ~ 1.9V, 3.15V ~ 3.6V, 5V | 1.7V ~ 1.9V, 3.15V ~ 3.6V, 5V |
| Voltage - Supply, Digital | 1.7V ~ 1.9V | 1.15V ~ 1.25V, 1.7V ~ 1.9V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the primary differences between the AFE5818ZBV and AFE5809ZCF?
The AFE5818ZBV is an 8-channel fully integrated analog front end with a maximum sampling rate of 65 MSPS and 14-bit resolution, while the AFE5809ZCF is an 8-channel AFE with a maximum sampling rate of 65 MSPS and 14-bit resolution that additionally integrates a digital demodulator and continuous wave (CW) Doppler processing block. Both are ultrasound AFEs, but the AFE5809ZCF includes on-chip CW Doppler mixing and digital I/Q demodulation that the AFE5818ZBV does not.
Are the AFE5818ZBV and AFE5809ZCF pin-compatible?
No. The AFE5818ZBV is supplied in a 9 mm × 9 mm 64-pin QFN package (ZBV suffix), while the AFE5809ZCF is supplied in a 9 mm × 9 mm 64-pin QFN package (ZCF suffix). Although both use a 64-pin QFN body size, the pin functions and internal signal routing differ because the AFE5809ZCF includes CW Doppler and demodulation blocks, so the devices are not drop-in pin-compatible. Designers must verify the pinout against the respective datasheets before considering substitution.
Do both devices support the same maximum sampling rate and resolution?
Yes. Both the AFE5818ZBV and AFE5809ZCF are 14-bit, 8-channel analog front ends with a maximum sampling rate of 65 MSPS, as specified in their respective Texas Instruments datasheets. The ADC resolution and maximum conversion rate are identical between the two parts.
Which device includes continuous wave (CW) Doppler support?
The AFE5809ZCF integrates a continuous wave (CW) Doppler processing block with on-chip I/Q demodulation and a digital demodulator, making it suitable for CW Doppler ultrasound modes. The AFE5818ZBV does not include the CW Doppler mixing and demodulation block; it is a standard 8-channel ultrasound AFE without integrated CW Doppler processing.
What are the input-referred noise specifications for these AFEs?
Both devices are specified with low input-referred noise suitable for ultrasound receive chains. The AFE5818ZBV datasheet specifies an input-referred noise of approximately 0.8 nV/√Hz at a 2.5 Vpp input signal, and the AFE5809ZCF datasheet specifies a comparable low-noise performance in the same range. Designers should consult the specific datasheet noise plots for the exact test conditions, as noise performance depends on gain setting and input configuration.
Can the AFE5818ZBV be used as a substitute for the AFE5809ZCF in an existing design?
Not directly. Because the AFE5809ZCF includes integrated CW Doppler and digital demodulation blocks that the AFE5818ZBV lacks, substituting the AFE5818ZBV would remove CW Doppler functionality and require firmware and signal-chain changes. Additionally, the pinouts and register maps differ between the two devices, so a direct drop-in replacement is not possible without schematic and software redesign.
What package and operating temperature range do these devices share?
Both the AFE5818ZBV and AFE5809ZCF are offered in a 64-pin QFN package measuring 9 mm × 9 mm and are specified for an industrial operating temperature range of –40°C to +85°C, per their Texas Instruments datasheets. The package footprint outline is similar, but pin assignments differ as noted above.