SP9504 查看數據表（PDF） - Signal Processing Technologies
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SP9504 Datasheet PDF : 11 Pages
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DB11 - DB8 4
DB7 - DB4 4
4
DB3 - DB0 4 MUX
INPUT
REGISTER
4 8–BIT
LATCH
4
4
4-BIT
LATCH
DAC
REGISTER
8
3 TO 7
DECODE
&
5 BITS
LATCH
4
Ref In
12 DAC
40 KΩ 40 KΩ
–
+
VOUT
Figure 1. Detailed Block Diagram (only one DAC shown)
USING THE SP9504 WITH
DOUBLE-BUFFERED INPUTS
Loading Data
To load a 12-bit word to the input register of
each DAC, using a 12-bit data bus, the sequence
is as follows:
1) Set XFER=1, B1/B2=1, CLR=1, WR1=1,
WR2=1, CS=1.
2) Set A1 and A0 (the DAC address) to the
desired DAC — 0,0 = DAC1; 0,1 = DAC2
1,0 = DAC3; 1,1 = DAC4 .
3) Set D11 (MSB) through D0 (LSB) to the
desired digital input code.
4) Load the word to the selected DAC by
cycling WR1 and CS through the follow-
ing sequence:
“1” — “0” — “1”
5) Repeat sequence for each input register.
To load a 12-bit word to the input register of
each DAC, using an 8-bit data bus, the sequence
is as follows:
1) Set XFER=1, B1/B2=1, CLR=1, WR1=1,
WR2=1, CS=1.
2) Set D11 through D4 to the 8 MSB’s of the
desired digital input code.
3) Load the 8 MSB’s of the digital word to
the selected input register by cycling WR1
and CS through the “1” — “0” — “1”
sequence.
4) Reset B1/B2 from “1” —— “0”
5) Set D11 (MSB) through D8 to the 4 LSB’s
of the digital input code.
6) Load the 4 LSB’s by cycling WR1 and CS
through the “1” — “0” — “1” sequence.
7) Repeat sequence for each input register.
A1 A0
CS WR1 B1/B2 WR2 XFER CLR
FUNCTION
00
1
1
X
X Address DAC 1 and load input register
00
0
1
X
X Address DAC 1 and load 4 LSBs
01
1
1
X
X Address DAC 2 and load input register
01
0
1
X
X Address DAC 2 and load 4 LSBs
10
1
1
X
X Address DAC 3 and load input register
10
0
1
X
X Address DAC 3 and load 4 LSBs
11
1
1
X
X Address DAC 4 and load input register
11
0
1
X
X Address DAC 4 and load 4 LSBs
XX
**
**
X
1 Transfer data from input registers to DAC registers
XX
X
X
X
1
Sets all DAC output voltages to 0V
XX
1
1
X
0
0
Temporarily force all DAC output voltages to 0V,
while CLR is low
XX
1
X
X
X
X
X Invalid state with any other control line active
XX
X
1
X
X
X
X Invalid state with any other control line active
X = Don’t care; ** = Don’t care; however, CS and WR1 = 1 will inhibit changes to the input registers.
Table 2. Control Logic Truth Table
SP9504DS/03
SP9504 Quad, 12-Bit, Voltage Output D/A Converter
6
© Copyright 2000 Sipex Corporation
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