The ADCoctoSPI01 is an eight-channel, high-speed analog-to-digital conversion module designed for signal acquisition in imaging and similar high-speed applications. It integrates a Texas Instruments AFE5801 analog front-end (AFE), which combines eight variable-gain amplifiers (VGAs) and eight 12-bit ADCs with a sampling rate up to 65 MSPS. Data output is serialized through an LVDS interface.
This module is ideally used in combination with the MPPB01 baseboard for Parallella, which features a compatible miniSAS connector, allowing for direct integration and high-speed data transfer.
- 8 differential analog input channels
- Integrated AFE5801 from Texas Instruments
- 8x VGAs with -5 dB to 31 dB gain range
- 8x 12-bit ADCs, up to 65 MSPS sampling rate
- Integrated anti-aliasing filter (7.5 / 10 / 14 MHz selectable)
- Serial LVDS output
- SPI control interface
- MiniSAS (SFF-8087) connector for LVDS data output
- Separate SPI interface for configuration and diagnostics
- On-board linear regulators for 1.8V and 3.3V supplies
- Operating voltage: 3.6 V to 5.4 V
- Operating temperature: -20 °C to +40 °C
| Parameter | Value | Description |
|---|---|---|
| ADC Resolution | 12 bits | Per channel |
| Number of Channels | 8 | Differential |
| Max Sampling Rate | 65 MSPS | Per channel |
| Input Voltage Swing | 2 Vpp | Differential, max linear input range |
| VGA Gain Range | -5 dB to +31 dB | Step size: 0.125/1 dB |
| Input Referred Noise | 5.5 nV/√Hz | At VGA gain = 31 dB |
| Signal-to-Noise Ratio (SNR) | ~65 dBFS | Typical at 65 MSPS, -1 dBFS input |
| Total Harmonic Distortion (THD) | -65 dBFS | At 5 MHz input, max gain |
| Signal-to-Noise and Distortion Ratio (SINAD) | ~68 dB | |
| Antialias Filter Cutoff | 7.5 / 10 / 14 MHz | Programmable |
| Common-Mode Input Voltage (VCM) | 1.6 V | Recommended bias for AC coupling |
| Input Capacitance | 2 pF | Differential input |
| Input Resistance | 5 kΩ | To internal bias |
- J1-J4: Differential analog inputs (IN1P/M to IN8P/M) (SATA connectors)
- J10A: MiniSAS connector for serialized LVDS data (D1-D8, FCLK, DCLK)
- J8: SPI control interface (SCLK, SDATA, SDOUT, SEN, RESET, SYNC)
- J11: Power input (+5V, GND)
- Requires a single 5V power supply.
- Onboard regulators generate 3.3V and 1.8V for AFE operation.
- Gain Control: SPI-controlled VGA gain, from -5 dB to 31 dB in 0.125 dB or 1 dB steps
- Clamping and Filtering: Optional signal clamping and integrated third-order low-pass filter
- Sampling Clock: Differential clock input (LVDS/PECL supported)
- LVDS Output: Serialized outputs for each channel (D1-D8), frame clock (FCLK), and data clock (DCLK)
- Medical ultrasound systems
- Non-destructive testing
- High-speed data acquisition
- Multichannel signal digitization in SDR receivers
- AFE5801 Datasheet
- Other compatible AFEs: AFE5805, AFE5809 (with differing performance and power specs)
- Only the AFE5801 is populated by default; board supports footprint-compatible variants (AFE5803, AFE5804 etc.).
- For optimal performance, ensure proper analog signal termination and impedance matching on all differential inputs.
- Follow ESD precautions during handling.