Alexei Semenov Generic Digitizer
Futures
12 channels, 16 bit at 6U VME Board
DC- up to 10MSPS Operation
Up to 500k sample per channel buffer
Hardware & Software onboard data processing
Smart triggering based on FPGA algorithm
Alexei Semenov Generic Digitizer
Generic Digitizer
FPGACYCLONEEP1C12240
State MachineLogic
OR/ANDNIOS
EmbeddedProcessor
10MHz,16bit 3 channels ADC
4 CHIPS
VMEDrivers
4Mx32SDRAM
MT48LC4M32B2
4 Mbit Serial
Configuration DeviceEPCS4
EPCS4 Interface MAX7128
JTAG
Analog
Inputs
CLOCK OUT
External Control
VME BUS
CRYSTAL25MHz
4 Mbit Serial
FLASH DeviceEPCS4
GATE
TRIGGER
SYNC IN
TCLK
SYNC OUT
CLOCK IN
Alexei Semenov Generic Digitizer
Digitizer Prototype
12 analog inputs
HW Reset
EXT Gate
SYNC
TCLK
EXT Clock
EXT Trigger
LED s:Ready, VME,Gate, Trigger
HW AddressMode Select SW
SDRAM
JTAG
ADC s FPGA
PreAMP s
VMEDRIVER s
25MHzCrystal
ConfigurationDevice
Alexei Semenov Generic Digitizer
AD9826 16-Bit Signal Processor
The AD9826 is a complete analog signal processor. It features a 3-channel architecture designed to sample and condition the outputs of color CCD arrays. Each channel consists of an input clamp, Correlated Double Sampler (CDS), offset DAC, and Programmable Gain Amplifier (PGA), multiplexed to a high-performance 16-bit A/D converter.
Features
•16-Bit 15 MSPS A/D Converter
•3-Channel 16-Bit Operation up to 15 MSPS
•1-Channel 16-Bit Operation up to 12.5 MSPS
•Correlated Double Sampling
•1~6x Programmable Gain
•±300 mV Programmable Offset
•Input Clamp Circuitry
•Internal Voltage Reference
•Multiplexed Byte-Wide Output
•Optional Single Byte Output Mode
•3-Wire Serial Digital Interface
Alexei Semenov Generic Digitizer
VMEinterface
Digitizer MODEControl
RF,53MHz
TCLK
DatafromADC
PLL Multiplier
ADCCLOCK
ADC Data Channels
MUX
VME BUS
FPGA Design
FIFO512x16FIFO
512x16FIFO
512x16
3 channels x 4 = 12channels
DataMUX
ADC Serial Control interface
SetADC
Mode,Gain,Offset
INTCLOCK25MHz
Gate
Trigger
Sync
SDRAMInterface
SDRAM
Serial configuration
DeviceInterface
To EPCS4 Interface
LocalBUS
Arbiter&
MUX
Alexei Semenov Generic Digitizer
STILL OPEN QUESTIONS
Channel to channel crosstalk is ~80dB at 10MHz from specification for AD9826. What is this ratio for a real board? And also,
What is a total ADC noise (3-9 LSB from spec) ?
What is a Integral and Differential Nonlinearity (16 and 0.5 LSB from spec)?