
Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
DR9 Driver/Receiver Board H-5
DB
FRONT
PANEL
DATA
DVL
RH
CVL
+
-
-
+
DVH
EN
RL
PROG
LOAD
SENSE
I-Al-Hi
I-Al-Lo
VCom-Hi
I-Source
I-Sink
VCom-Lo
DAC
I/O CONTROL
CH 1-24
DUT_GND
PIN ELECTRONICS
OV
CVH
OC
50
Ω
CONTROL
LOGIC
EXTSENSE
V+/V-
CONTROL
LOGIC
MONITOR
GND_REF
EXTFORCE
OVERVOLT
TEMPMON
TEMP
ACH 1-24
SEE NOTE BELOW
Figure H-4: DR9 Driver & Receiver I/O Block Diagram
Note: There are two important features associated with the
Analog Channel and Digital Channel relay control logic. First,
these relay connections are exclusive; if the CH1 connection relay
is CLOSED the ACH1 relay cannot be closed. Second, the
control logic is implemented to provide a “Break-Before-Make”
connection to protect the Pin Electronics from potential damage.
Analog Channel connections have voltage specifications that are
far beyond the ability of the DR9 overvoltage detection and
protection circuitry to reliably operate. Programming an Analog
Channel relay opens the associated Digital Channel relay if it is
closed. There is a 5 ms latency after making the Analog Channel
relay connection to ensure that the Digital Channel relay has had
time to open.
Signal Descriptions
DATA
Channel and auxiliary data output signals from the Data
Sequencer to the programmable output drivers.
EN
Channel and auxiliary enable output signals from the Data
Sequencer to the programmable output drivers.
OC
Over-Current detect from the programmable Driver and
Receiver channels.
RH
Response High input signals to the Data Sequencer from
the programmable input receivers. 1 = good 1,
0 = good 0.
RL
Response Low input signals to the Data Sequencer from
the programmable input receivers. 0 = good 0,