DAC8806 Datasheet, PDF (13/20 Pages) Texas Instruments – 14-Bit, Parallel Input Multiplying Digital-to-Analog Converter

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DAC8806
SBAS385A – APRIL 2006 – REVISED JUNE 2006
THEORY OF OPERATION (continued)
V_DD
U1
V_DD R_OFS R_FB
V_REF
DAC8806
I_OUT
GND
+15V
U2
V+
OPA277
V-
-15V
V_OUT
Figure 39. Voltage Output Configuration
t_WR
WR
DATA
LDAC
RST
t_DS
t_DH
t_LWD
t_LDAC
t_RST
Figure 40. DAC8806 Timing Diagram
CONTROL INPUTS
RST
WR
LDAC
0
X
X
1
0
0
1
1
1
1
0
1
1
1
1
0
Table 1. Function of Control Inputs
REGISTER OPERATION
Asynchronous operation. Reset the input and DAC register to a predetermined value. The DAC8806
is reset to all 0s.
Load the input register with all 14 data bits.
Load the DAC register with the contents of the input register.
The input and DAC register are transparent.
LDAC and WR are tied together and programmed as a pulse. The 14 data bits are loaded into the
input register on the falling edge of the pulse and then loaded into the DAC register on the rising
edge of the pulse.
No register operation.
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