| AOH
Termination |
In order to obtain the correct
signal sizes in the readout chain, the analogue termination resistors must
be set correctly.
The current output of the APV is terminated by the APVMUX and the AOH -
the two values add in parallel. The implementation on the AOH differs slightly
between TOB/TEC and TIB/TID, as shown below. |
|
TIB/TID
|
TOB/TEC
|
|
|
|
|
RAOH
is 2x 100ohms to Vref
|
RAOH
is 1x 220ohms between Vin+ & Vin-
|
|
| The nominal termination
for the APV being 50ohms to Vref, one should set RMUX
to be 100ohms per branch. This corresponds to sending a value of (for example)
15 (0xF) via I2C to the APVMUX. |
|
| Last modified by
JT: Wed, 12-Mar-2003 11:21 |
