National Instruments NI PCI-6110 - Manual (Page 21)

Chapter 3 Hardware Overview
NI PCI-6110/6111 User Manual 3-2 ni.com
Figure 3-2. NI PCI-6111 Block Diagram
Analog Input
The AI section for the NI PCI-6110/6111 is software configurable. You can
select different AI configurations through application software. The
following sections describe in detail each AI setting.
Input Mode
The NI PCI-6110/6111 supports only differential (DIFF) inputs. DIFF
input mode provides up to four channels on the NI PCI-6110 and up to
two channels on the NI PCI-6111.
Note The inputs are differential only in the sense that the ground loops are broken. The
negative input is not intended to carry signals of interest, rather it provides a DC reference
point for the positive input, which may be different than ground.
A channel configured in DIFF input mode uses two AI channel lines.
One line connects to the positive input of the device programmable gain
instrumentation amplifier (PGIA), and the other connects to the negative
Timing
PFI / Trigger
I/O Connector
RTSI Bus
Digital I/O (8)
EEPROM
+
CH0
Amplifier
–
Calibration
Mux
AI CH0
Mux
CH0
Latch
Analog
Trigger
Circuitry
2 Trigger Level
DACs
Trigger
12
4
Calibration
DACs
DAC0
DAC1
CH0
12-Bit ADC
Data (32)
Data (32)
Mini
MITE
Generic
Bus
Interface
PCI
Bus
Interface
IRQ
DMA
AO Control
CH0+
CH0-
+
CH1
Amplifier
– AI CH1
Mux
CH1
Latch
12 CH1
12-Bit ADC
CH1+
CH1-
AI Control
Data (16)
Data (16)
ADC
FIFO
DAC
FIFO
Address/Data
Control
PCI Bus
Analog
Input
Control
EEPROM
Control
DMA
Interface
FPGA
DAQ-STC
Bus
Interface
Analog
Output
Control
I/O
Bus
Interface
DAQ - STC
Analog Input
Timing/Control
Analog Output
Timing/Control
Digital I/O
Trigger
Counter/
Timing I/O
RTSI Bus
Interface
DMA/IRQ
Bus
Interface