Alexei Semenov Generic Digitizer

Generic Digitizer 10MHZ

16 bit

6U VME Board

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

LabView Interface

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)?