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SP9504JS Datasheet(PDF) 7 Page - Sipex Corporation

Part # SP9504JS
Description  Quad, 12-Bit, Voltage Output D/A Converter
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP9504JS Datasheet(HTML) 7 Page - Sipex Corporation

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SP9504DS/03
SP9504 Quad, 12-Bit, Voltage Output D/A Converter
© Copyright 2000 Sipex Corporation
7
bringing WR1 low will transfer the data to the
addressed DAC. The user should be sure to
bring WR1 high again so that the next selected
DAC will not be overwritten by the last digital
code. This mode of operation may be useful in
applications where preloading of the input
registers is not necessary Figure 3a.
A fully transparent mode is realized by tying
WR1, CS, WR2, and XFER all low. In this
mode, anything that is written on the12-bit data
bus will be passed directly to the selected DAC.
Since both latches are not being used, the previ-
ous digital word will be overwritten by the new
data as soon as the address changes. This may be
useful should the user want to calibrate a circuit,
by taking full scale or zero scale readings for all
four DAC’s, Figure 3b.
ZEROING DAC OUTPUTS
While keeping XFER pin high, the DAC outputs
can be set to zero volts two different ways. The
first involves the CLR and WR2 pins. In normal
operation, the CLR pin is tied high, thus, dis-
abling the clear function. By cycling WR2 and
CLR through "1" —"0" —"1" sequence, a digi-
tal code of 1000 0000 0000 is written to all four
DAC registers, producing a half scale output or
zero volts. The second utilizes the built in power-
TRANSFERRING DATA
To transfer the four 12-bit words in the four
input registers to the four DAC registers:
1) Set CLR=1, CS=1, WR1=1.
2) Cycle WR2 and XFER through the “1”
— “0” — “1” sequence.
To set the outputs of the four DAC’s to 0V, cycle
WR2 and CLR through the “1” — “0” — “1”
sequence, while keeping XFER=1.
ONE LATCH, OR NO LATCHES
The latches that form the registers can be used in
a “semi-” transparent mode, and a “fully-”
transparent mode. In order to use the SP9504 in
either mode the user must be interfaced to a
12-bit bus only (B1=1).
The semi–transparent mode is set up such that
the second set of latches is transparent and the
first set is used to latch the incoming data. Data
is latched into the first set rather than the second
set, in order to minimize glitch energy induced
from the data formatting. In this mode, XFER,
WR2 and CS are tied low, and WR1 is used to
strobe the data to the addressed DAC. Each
DAC is addressed using the address lines A
0 and
A
1. After the appropriate DAC has been selected
and the data is settled at the digital inputs,
Figure 2. Transfer Function
REF IN
+
VOut
D
VOut =
–1 x
D
2048
(
)
VDAC =x
D
4,096
VDAC
REF IN
REF IN


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