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PDF HS3160 Data sheet ( Hoja de datos )
| Número de pieza | HS3160 | |
| Descripción | 16-Bit Multiplying DACs | |
| Fabricantes | Sipex Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HS3160 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Corporation
SIGNAL PROCESSING EXCELLENCE
s Monolithic Construction
s 16–Bit Resolution
s 0.003% Non-Linearity
s Four-Quadrant Multiplication
s Latch-up Protected
s Low Power - 30mW
s Single +15V Power Supply
www.DataSheet4U.com
SP7516 and HS3160
16-Bit Multiplying DACs
DESCRIPTION…
The SP7516 and HS3160 are precision 16-bit multiplying DACs, that provide four-quadrant
multiplication. Both parts accept both AC and DC reference voltages. The SP7516 is available
for use in commercial and industrial temperature ranges, packaged in a 24-pin SOIC. The
HS3160 is available in commercial and military temperature ranges, packaged in a 22-pin
side-brazed DIP.
VREF Force
VREF Sense
23
22
GND
VDD
4
21
56 7 8
BIT1 BIT2 BIT3 BIT4
(MSB)
Switches shown in high state.
SP7516
20
BIT16
(LSB)
24
RFEEDBACK
2 IOUT2 Sense
3
1
IOUT2 Force
IOUT1
VREF 21
GND
VDD
3
20
45 6 7
BIT1 BIT2 BIT3 BIT4
(MSB)
Switches shown in high state.
2
IOUT2
1
IOUT1
HS3160
19
22
BIT16 RFEEDBACK
(LSB)
Corporation
SIGNAL PROCESSING EXCELLENCE
127
1 page  
2 - 1(MSB)
0
0
1
1
2 -2
0
1
0
1
Output
0
1/4 Full-Scale
1/2 Full-Scale
3/4 Full-Scale
Table 1. Contribution of the two MSB's
The most common technique for building a D/A
converter of n bits is to use n switches to turn n current
or voltage sources on or off. The n switches and n
sources are designed so that each switch or bit contrib-
utestwiceasmuchtotheD/Aconverter’soutputasthe
preceding bit. This technique is commonly known as
binary weighting and allows an n-bit converter to
generate 2n output levels by turning on the proper
combination of bits.
In such a binary-weighted converter, the switch
www.DataSheewt4iUth.ctohme smallest contribution (the LSB) accounts
for only 2 -n of the converter’s full-scale value.
Similarly, the switch with the largest contribution
(the MSB) accounts for 2 -1 or half of the converter’s
full-scale output. Thus it is easy to see that a given
percent change in the MSB will have a greater
effect on the converter’s output than would a
similar percent change in the LSB. For example, a
1% change in the LSB of a 10 bit converter would
only affect the output by 0.001% of full-scale. A
1% change in the MSB of the same converter
would affect the output by 0.5% of FSR.
In order to overcome the problem which results from
the large weighting of the MSB, the two MSB’s can
be decoded to three equally weighted sources. Table
1 shows that all combinations of the two MSB’s of a
converter result in four output levels. So by replacing
the two MSB’s with three bits equally weighted at 1/
4 full-scale and decoding the two MSB digital inputs
into three lines which drive the equally weighted bits,
TRANSFER FUNCTION (N=16)
BINARY INPUT UNIPOLAR OUTPUT BIPOLAR OUTPUT
111...111
100...001
100...000
011...111
000…001
000...000
–VREF (1 - 2–N)
–VREF (1/2 + 2–N)
–VREF /2
–VREF (1/2 – 2–N)
–VREF (2(N – 1))
0
–VREF (1 – 2 –(N – 1))
–VREF (2 )–(N – 1)
0
VREF (2 )–(N – 1)
VREF (1 – 2 –(N – 1))
VREF
Table 2. Transfer Function
400Ω
V REF
470Ω
V DD
DIGITAL
INPUTS
SP7516
HS3160
RFEEDBACK
I O1
I O2
200Ω
ROS
-
A
+
V OUT
GND
Figure 2. Unipolar Operation
the same functional performance can be obtained.
Thus by replacing the two MSB switches of a conven-
tional converter with three switches properly de-
coded, the contribution of any switch is reduced from
1/2to1/4.Thisreductioninsensitivityalsoreducesthe
accuracy required of any switch for a given overall
converter accuracy.
With the decoded converter described above, a 1%
change in any of the converter’s switches will affect
the output by no more than 0.25% of full-scale as
compared to 0.5% for a conventional converter. In
other words the conventional D/A converter can be
made less sensitive to the quality of its individual bits
by decoding.
In the SP7516/HS3160 the first four MSB’s are
decodedinto16levelswhichdrive15equallyweighted
current sources. The sensitivity of each switch on the
output is reduced by a factor of 8. Each of the 15
sources contributes 6.25% output change rather than
an MSB change of 50% for the common approach.
400Ω
V REF
470Ω
V DD
200Ω
RFEEDBACK
I O1
DIGITAL
INPUTS
SP7516
HS3160
4KΩ
4KΩ
IO2
GND
ROS2 R
ROS2
-
A2
+
ROS1
-
A1
+ VOUT
V OUT1
A1, A2 , OP-07
Figure 3. Bipolar Operation
Corporation
SIGNAL PROCESSING EXCELLENCE
131
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet HS3160.PDF ] | |
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