Datasheet
1 Fm
Internal
1.69V
AFE0064
FLATPANEL
DETECTOR
Pixel
TFT Switch
PhotoDiode
EXTC
AFE0064
www.ti.com
........................................................................................................................................................................................ SLAS672 –SEPTEMBER 2009
APPLICATION INFORMATION
INTERFACING FLAT PANEL DETECTOR (FPD)
The following figure shows interfacing a flat panel detector to an AFE0064. The flat panel detector is a matrix of
pixels. Each pixel consists of a photo diode and Thin Film Transistor switch. All of the pixels in a single row (or
column depending on the convention used) are connected to a single bus. This bus interfaces with a single
integrator. There is a separate integrator channel per row.
On X-Ray exposure (converted to light with scintillator) individual photo diodes acquire a charge proportional to
incident light intensity. This charge is sampled in self capacitance of the photo diode. The columns are scanned
one by one and the AFE0064 converts an individual photo diode charge into a proportional voltage.
ADC INTERFACE WITH AFE OUTPUT
Each AFE0064 has two differential output drivers as mentioned previously. AFE allows cascading of two devices
which can work together like a single 128 channel device. Refer to Figure 8 for the timing diagram.
Copyright © 2009, Texas Instruments Incorporated Submit Documentation Feedback 23
Product Folder Link(s) :AFE0064