AFE0064 Datasheet, PDF (17/25 Pages) Texas Instruments – 64 Channel Analog Front End for Digital X-Ray Detector

AFE0064
www.ti.com ........................................................................................................................................................................................ SLAS672 – SEPTEMBER 2009
IRST
SHR
SHS
TFT Switch on
DF-SM
INTG
Compensation
charge
C1 charge injection
= (V at Pins 56,57 –
Voltage at ‘ECT_C’)*
0.857pC
REFP
+ve charge
(Integrator down)
-ve charge
(Integrator up)
Electron counting
Integrator output
( internal)
For Integration
down mode
REFM
Reset sample
Vint off
Hole counting
Signal sample
Electron counting
Integrator output
( internal)
For Integration up
mode
REFP
REFM
Hole counting
Vint_off
Reset sample
Device allows integration
with both polarity
Signal sample
Figure 10. Handling Bipolar Charge Range Using Charge Injection Scheme
Note the relation between the integrator output and AFE0064 output ( OUTP and OUTM) described in the Data
Read section.
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