The Keysight/Agilent/HP E1438D is a single-channel C-size VXI digitizer delivering 100 MSa/s (selectable to 102.4 MSa/s) signal acquisition with integrated Digital Signal Processing for high-speed measurement and analysis. Engineered for demanding ATE and radar test environments, the E1438D combines a 40 MHz anti-alias filter, –90 dBfs spurious-free dynamic range, and 144 MB expandable RAM with dual high-speed data interfaces: a 2.5 Gbit/sec optical front panel port (VITA 17.1 Draft compliant, multi-mode fiber, 850 nm, up to 100 m) and VXI local bus connectivity. The 50 Ω input accepts DC or AC coupling with configurable attenuation across 17 dB steps (30 dBm to –21 dBm) and programmable digital decimation filters spanning 40 MHz to 305 Hz center frequency.
## Technical Specifications
**Signal Acquisition**
• Sampling Rate: 100 MSa/s or 102.4 MSa/s (software selectable)
• Input Bandwidth: 0–40 MHz
• Input Impedance: 50 Ω (>18 dB return loss, 1.3 VSWR)
• Input Coupling: DC or AC (0.2 µF)
• Analog Input: BNC connector, shell grounded
• ADC Overload Level: 0 dBfs typical
**Dynamic Range and Filtering**
• Input Range: 30 dBm to –21 dBm (3 dB steps, 10.0 Vp to 28.2 mVp)
• Spurious-Free Dynamic Range: –90 dBfs
• Anti-Alias Filter: 40 MHz with bypass
• Harmonic Distortion: –85 dBc typical (3rd order, –25 dBm 13 MHz signal, –15 dBm range)
• Digital Decimation: Tunable center frequency, 17 octave steps (40 MHz to 305 Hz)
**Memory and Interfaces**
• FIFO Memory: 144 MB RAM (expandable to 1.2 GB)
• Optical Data Port: 2.5 Gbit/sec, VITA 17.1 Draft, multi-mode fiber 850 nm, max 100 m (>200 MBytes/sec throughput)
• VXI Local Bus: 66 MBytes/s data transfer rate
• FPDP: 2.5 Gigabit/second
• VXIbus: Standard communication
## Key Features
• Programmable input attenuation with fine resolution across wide dynamic range
• Integrated DSP with tunable decimation filters for post-acquisition analysis
• Dual optical and electrical data paths for flexible system integration
• 144 MB base memory expandable for extended acquisition windows
## Typical Applications
• Automated test equipment (ATE) for RF and baseband signal characterization
• Radar and pulse signal analysis
• High-speed transient capture
## Compatibility & Integration
Operates within VXI chassis architecture with direct module-to-module data transfer via local bus. Optical FPDP port accommodates long-distance data streaming in distributed test systems.
