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232 L4400 User’s Guide
9 L4451A 4-Channel Isolated D/A Converter with Waveform Memory
The following diagram shows individual DAC channel configuration.
All channels are configured the same.
L4451A D-Sub Connector Pinout
16 Bits
Waveform
Memory
HI Voltage Sense
LO Voltage Sense
HI Voltage, + Current
LO Voltage, − Current
Calibration Constant
(non-volatile memory)
Immediate
Data
25 mA Thermal Fuse
(resettable)
34951A Module User-Supplied Connections
(1 of 4 Channels)
DAC x
Control Logic
Internal
Clock
Internal
Trigger
Ext Clock In/Out
Ext Trig In/Out
34 35
36 37
38 39 40
41
42 43 44 45 46 47 48 49
50
GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND
18
19
20 21 22 23 24 25 26 27 28 29 30 31 32 33
1234567891011121314151617
GNDGND NC 4 L 4H 3L 3H
GND GND
NC 2L 2H GND NC 1L 1H
GND
EXT
CLKGND
4L
Sense
4H
Sense GND TRIG GND
2L
Sense
2H
Sense
1L
Sense
1H
Sense
GND
3L
Sense
3H
Sense GND GND
50-Pin D-Sub
Female Connector
Description Socket Description Socket Description Socket Description Socket Description Socket
1L 15 3L Sense 21 GND 8 GND 34 GND 44
1H 16 3H Sense 22 GND 9 GND 35 GND 45
1L Sense 31 4L 3 GND 13 GND 36 GND 46
1H Sense 32 4H 4 GND 17 GND 37 GND 47
2L 11 4L Sense 19 GND 18 GND 38 GND 48
2H 12 4H Sense 20 GND 23 GND 39 GND 49
2L Sense 27 External Clock 24 GND 26 GND 40 GND 50
2H Sense 28 Trigger 25 GND 29 GND 41 No Connect 2
3L 5 GND 1 GND 30 GND 42 No Connect 10
3H 6 GND 7 GND 33 GND 43 No Connect 14