|
|
PDF AD7528 Data sheet ( Hoja de datos )
| Número de pieza | AD7528 | |
| Descripción | CMOS Dual 8-Bit Buffered Multiplying DAC | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AD7528 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
a
FEATURES
On-Chip Latches for Both DACs
+5 V to +15 V Operation
DACs Matched to 1%
Four Quadrant Multiplication
TTL/CMOS Compatible
Latch Free (Protection Schottkys not Required)
APPLICATIONS
Digital Control of:
Gain/Attenuation
Filter Parameters
Stereo Audio Circuits
X-Y Graphics
CMOS Dual 8-Bit
Buffered Multiplying DAC
AD7528
VDD
DB0
DATA
INPUTS
DB7
FUNCTIONAL BLOCK DIAGRAM
VREF A
INPUT
BUFFER
LATCH
DAC A
DAC A/
DAC B
CS
WR
DGND
CONTROL
LOGIC
AD7528
LATCH
DAC B
RFB A
OUT A
AGND
RFB B
OUT B
GENERAL DESCRIPTION
The AD7528 is a monolithic dual 8-bit digital/analog converter
featuring excellent DAC-to-DAC matching. It is available in
skinny 0.3" wide 20-lead DIPs and in 20-lead surface mount
packages.
Separate on-chip latches are provided for each DAC to allow
easy microprocessor interface.
Data is transferred into either of the two DAC data latches via a
common 8-bit TTL/CMOS compatible input port. Control
input DAC A/DAC B determines which DAC is to be loaded.
The AD7528’s load cycle is similar to the write cycle of a ran-
dom access memory and the device is bus compatible with most
8-bit microprocessors, including 6800, 8080, 8085, Z80.
The device operates from a +5 V to +15 V power supply, dis-
sipating only 20 mW of power.
Both DACs offer excellent four quadrant multiplication charac-
teristics with a separate reference input and feedback resistor for
each DAC.
PRODUCT HIGHLIGHTS
1. DAC-to-DAC matching: since both of the AD7528 DACs are
fabricated at the same time on the same chip, precise match-
ing and tracking between DAC A and DAC B is inherent.
The AD7528’s matched CMOS DACs make a whole new
range of applications circuits possible, particularly in the
audio, graphics and process control areas.
2. Small package size: combining the inputs to the on-chip DAC
latches into a common data bus and adding a DAC A/DAC B
select line has allowed the AD7528 to be packaged in either a
small 20-lead DIP, SOIC or PLCC.
VREF B
ORDERING GUIDE1
Model2
Temperature
Ranges
Relative Gain Package
Accuracy Error Options3
AD7528JN
AD7528KN
AD7528LN
AD7528JP
AD7528KP
AD7528LP
AD7528JR
AD7528KR
AD7528LR
AD7528AQ
AD7528BQ
AD7528CQ
AD7528SQ
AD7528TQ
AD7528UQ
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–55°C to +125°C
–55°C to +125°C
–55°C to +125°C
±1 LSB
±1/2 LSB
±1/2 LSB
±1 LSB
±1/2 LSB
±1/2 LSB
±1 LSB
±1/2 LSB
±1/2 LSB
±1 LSB
±1/2 LSB
±1/2 LSB
±1 LSB
±1/2 LSB
±1/2 LSB
±4 LSB
±2 LSB
±1 LSB
±4 LSB
±2 LSB
±1 LSB
±4 LSB
±2 LSB
±1 LSB
±4 LSB
±2 LSB
±1 LSB
±4 LSB
±2 LSB
±1 LSB
N-20
N-20
N-20
P-20A
P-20A
P-20A
R-20
R-20
R-20
Q-20
Q-20
Q-20
Q-20
Q-20
Q-20
NOTES
1Analog Devices reserves the right to ship side-brazed ceramic in lieu of cerdip. Parts
will be marked with cerdip designator “Q.”
2Processing to MIL-STD-883C, Class B is available. To order, add suffix “/883B” to
part number. For further information, see Analog Devices’ 1990 Military Products
Databook.
3N = Plastic DIP; P = Plastic Leaded Chip Carrier; Q = Cerdip; R = SOIC.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
1 page  
VIN A
(± 10V)
VDD
DB0
DATA
INPUTS
DB7
INPUT
BUFFER
R11
LATCH DAC A
R21
RFB A
C12
OUT A
AGND AGND
VOUT A
DAC A/
DAC B
CS
WR
DGND
CONTROL
LOGIC
AD7528
LATCH DAC B
R41
RFB B
OUT B
C22
AGND
VOUT B
R31
VIN B
(± 10V)
NOTES:
1R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
SEE TABLE III FOR RECOMMENDED VALUES.
2C1, C2 PHASE COMPENSATION (10pF–15pF) IS REQUIRED WHEN
USING HIGH SPEED AMPLIFIERS TO PREVENT RINGING OR OSCILLATION.
Figure 4. Dual DAC Unipolar Binary Operation
(2 Quadrant Multiplication); See Table I
AD7528
Table I. Unipolar Binary Code Table
DAC Latch Contents Analog Output
MSB LSB
(DAC A or DAC B)
11111111
10000001
10000000
01111111
00000001
00000000
–V
IN
255
256
–V
IN
129
256
–V IN
128
256
=
− V IN
2
–V
IN
127
256
–V
IN
1
256
–V IN
0
256
=
0
( )( ) ( )Note: 1 LSB =
2−8
V IN
=
1
256
V IN
VDD
DB0
DATA
INPUTS
DB7
INPUT
BUFFER
DAC A/
DAC B
CS
WR
DGND
CONTROL
LOGIC
VIN A
(± 10V)
R11
LATCH DAC A
AD7528
LATCH DAC B
R31
R21
RFB A
R62
20k⍀
R72
10k⍀
C13
OUT A
AGND
A1
AGND
R41
RFB B
C23
OUT B
AGND
A3
R92
10k⍀
R102
20k⍀
VIN B
(± 10V)
NOTES:
1R1, R2 AND R3, R4 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
SEE TABLE III FOR RECOMMENDED VALUES.
ADJUST R1 FOR VOUT A = 0V WITH CODE 10000000 IN DAC A LATCH.
ADJUST R3 FOR VOUT B = 0V WITH CODE 10000000 IN DAC B LATCH.
2MATCHING AND TRACKING IS ESSENTIAL FOR RESISTOR PAIRS
R6, R7 AND R9, R10.
3C1, C2 PHASE COMPENSATION (10pF–15pF) MAY BE REQUIRED
IF A1/A3 IS A HIGH SPEED AMPLIFIER.
Figure 5. Dual DAC Bipolar Operation
(4 Quadrant Multiplication); See Table II
R5
20k⍀
A2
R11
5k⍀
AGND
R8
20k⍀
A4
R12
5k⍀
AGND
VOUT A
VOUT B
Table II. Bipolar (Offset Binary) Code Table
DAC Latch Contents Analog Output
MSB LSB
(DAC A or DAC B)
11111111
+V
IN
127
128
10000001
10000000
0
01111111
00000001
00000000
–V
IN
1
128
–V
IN
127
128
–V
IN
128
128
( )( ) ( )Note: 1 LSB =
2−7
V IN
=
1
128
V IN
Table III. Recommended Trim Resistor
Values vs. Grade
Trim
Resistor
R1; R3
R2; R4
J/A/S
1k
330
K/B/T
500
150
L/C/U
200
82
REV. B
–5–
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AD7528.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AD7520 | Multiplying D/A Converters |  Harris |
| AD7520 | 10-Bit/ 12-Bit/ Multiplying D/A Converters |  Intersil Corporation |
| AD7520 | (AD7520 / AD7521) Monolithic Multiplying D/A Converters | Analog Devices |
| AD7521 | Multiplying D/A Converters | Harris |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |