KatADC - david-macmahon/wiki_convert_test GitHub Wiki
Also known as
KAT-7 ADC / Ratty ADC
Specifications
- ADC
- 1x National Semiconductor (now Texas Instruments) ADC08D1520 8-bit Dual 1.5GSPS/Single 3.0GSPS ADC
- Inputs
- Clock: 1.5GHz (Max) 50Ohm 1dBm
- Signal: Single-ended
- Sync: LVTTL, 5V tolerant (SN65LVDS1)
- Outputs
- 1x Tyco Z-DOK+ 40
differential pair connector
- 4x 8-bit offset binary data @ DDR
- 1x digital clock to CASPER standard Z-DOK clock pins
- 1x Tyco Z-DOK+ 40
differential pair connector
- Control/Configuration
- ADC: 3-wire Serial
- RF Front-end: I2C
- RF Front-End (for each channel)
- 20dB Gain Block (50.0MHz - 850.0MHz)
- 0dB to 31.5dB Variable Attenuator (controllable in 0.5dB steps)
- Non-reflective 50ohm RF switch to disconnect input
- Provision for a fixed attenuator (LAT-series)
- Printed Circuit Board
- Stack Up
- 6-layers
- Thickness
- 2.4mm
- Material
- Rogers RO4003
- FR-4
- 7628 Prepreg
- Insertion Loss
- < 1.5dB/m
- Z Variation (50Ω nom.)
- < ±1%
- Stack Up
- Miscellaneous
- 2x Temperature Sensors
- ADC Internal
- Ambient
- 256 x 8-bit EEPROM
- Provision for EMI/RFI Shielding (for each channel)
- 2x Temperature Sensors
Versions
- V1.0 - Superseded
- Prototype
- V1.1 - Superseded
- Improved PSU Design to reduce heat generation
- V1.2 - Superseded
- Changed to a different CAD system and incremented the version number
- Functionally identical to V1.1
- V1.3 - Production Version
- Changed the silkscreen layout and solder mask
- Block Diagram (PNG)
- Schematics (PDF)
- PCB Manufacturing Data (ZIP)
- Altium Design Files (ZIP)
- Bill Of Materials (BOM)
High Frequency Amplifier Upgrade
The 20dB amplifier [(SBB-2089Z: 50.0MHz
-
850.0MHz)](http://casper.berkeley.edu/wiki/images/9/91/SBB-2089\(Z\)_Datasheet.pdf) in the RF front-end can be upgraded with a higher frequency device [(SBB-5089Z: 50.0MHz
-
6.0GHz)](http://casper.berkeley.edu/wiki/images/0/02/SBB-5089\(Z\)_Datasheet.pdf) by replacing the following components with the values shown:
- C27, C72 = 68pF (Package: 0402)
- L1, L2 = 82nH 1008CS (Package: 1008)
- L7, L8 = 0R Resistor (Package: 0402)
- U17, U18 = Sirenza Microdevices SBB-5089Z (Package: SOT-89)
Refer to the datasheets of the amplifiers for a performance comparison over their respective frequency ranges.