|
|
PDF SP9504 Data sheet ( Hoja de datos )
| Número de pieza | SP9504 | |
| Descripción | Quad / 12-Bit / Voltage Output D/A Converter | |
| Fabricantes | Sipex | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SP9504 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
|
No Preview Available !
® SP9504
Quad, 12–Bit, Voltage Output D/A Converter
s Low Cost
s Four 12–Bit DAC’s on a Single Chip
s Low Power — 80 mW (20mW/DAC)
s Double-Buffered Inputs
s ± 5V Supply Operation
s Voltage Outputs, ±4.5V Range
s Midscale Preset, Zero Volts Out
s Guaranteed +0.5 LSB Max INL
s Guaranteed +0.75 LSB Max DNL
s 2MHz 4-Quadrant Multiplying Bandwidth
s 28–pin SOIC and Plastic DIP
Packages
s Either 12 or 8 bit µP bus
DESCRIPTION
The SP9504 is a low power replacement for the popular SP9345, Quad 12-Bit Digital-to-Analog
Converter. It features +4.5V output swings when using ±5 volt supplies. The converter is double-
buffered for easy microprocessor interface. Each 12-bit DAC is independently addressable and
all DACS may be simultaneously updated using a single transfer command. The output settling-
time is specified at 4µs. The SP9504 is available in 28–pin SOIC and plastic DIP packages,
specified over commercial temperature range.
DATA
INPUTS
8 MSB's
4 LSB's
INPUT
REGISTERS
LATCH
LATCH
LATCH
LATCH
DAC
REGISTERS
LATCH
LATCH
LATCH
LATCH
Ref In
DAC
DAC
DAC
–
+
–
+
–
+
DAC
–
+
CONTROL LOGIC
VOUT1
VOUT2
VOUT3
VOUT4
A0 A1 CS WR1 B1/B2 WR2 XFER CLR
SP9504DS/03
SP9504 Quad, 12-Bit, Voltage Output D/A Converter
1
© Copyright 2000 Sipex Corporation
1 page  
FEATURES
The SP9504 is a low–power replacement for the
popular SP9345, Quad 12-Bit Digital-to-Analog
Converter. This Quad, Voltage Output, 12-Bit Digi-
tal-to-AnalogConverterfeatures±4.5Voutputswings
when using ±5 volt supplies. The input coding format
used is standard offset binary, Table 1.
The converterutilizesdouble-bufferingoneachofthe
12 parallel digital inputs, for easy microprocessor
interface. Each 12-bit DAC is independently addres-
sable and all DACS may be simultaneously updated
using a single XFER command. The output settling-
time is specified at 4µs to full 12–bit accuracy when
driving a 5Kohm, 50pF load combination. The
SP9504, Quad 12-Bit Digital-to-Analog Converter is
ideally suited for applications such as ATE, process
controllers,robotics,andinstrumentation. TheSP9504
is available in 28–pin plastic DIP or SOIC packages,
specified over the commercial (0°C to +70°C)
temperature range.
THEORY OF OPERATION
The SP9504 consists of five main functional blocks
— input data multiplexer, data registers, control logic,
four 12-bit D/A converters, and four bipolar output
voltage amplifiers. The input data multiplexer is
designed to interface to either 12- or 8-bit micropro-
cessordatabusses. Theinputdataformatiscontrolled
by the B1/B2 signal — a logic “1” selects the 12-bit
mode, while a logic “0” selects the 8-bit mode. In the
12-bitmodethedataistransferredtotheinputregisters
without changes in its format. In the 8-bit mode, the
four least significant bits (LSBs) are connected to the
MSB
1111
1111
1000
1000
0000
0000
INPUT
LSB
1111 1111
1111 1110
0000 0001
0000 0000
0000 0001
0000 0000
1 LSB =
OUTPUT
VREF - 1 LSB
VREF - 2 LSB
0 + 1 LSB
0
-VREF + 1 LSB
-VREF
2VREF
2 12
Table 1. Offset Binary Coding
four most significant bits (MSBs), allowing an 8-bit
MSB-justified interface. All data inputs are enabled
using the CS signal in both modes. The digital inputs
are designed to be both TTL and 5V CMOS compat-
ible.
InordertoreducetheDACfullscaleoutputsensitivity
to the large weighting of the MSB’s found in conven-
tional R-2R resistor ladders, the 3 MSB’s are decoded
into 8 equally weighted levels. This reduces the
contribution of each bit by a factor of 4, thus, reducing
the output sensitivity to mismatches in resistors and
switches by the same amount. Linearity errors and
stability are both improved for the same reasons.
Each D/A converter is separated from the data bus by
two registers,eachconsistingoflevel-triggeredlatches,
Figure 1. The first register (input register) is 12-bits
wide. The input register is selected by the address
input A0 and A1, and is enabled by the CS and WR1
signals. In the 8-bit mode, the enable signal to the 8
MSB’s is disabled by a logic low on B1/B2 to allow
the4LSB’stobeupdated. Thesecondregister(DAC
register), accepts the decoded 3 MSB’s plus the 9
LSB’s. The four DAC registers are updated simulta-
neously for all DAC’s using the XFER and WR2
signals. Using the CLR and WR2 signals or the
power-on-reset, (enabled when the power is switched
on) the DAC registers are set to 1000 0000 0000 and
the DAC outputs will settle to 0V.
Using the control logic inputs, the user has full control
of address decoding, chip enable, data transfer and
clearing of the DAC’s. The control logic inputs are
level triggered, and like the data inputs, are TTL and
CMOS compatible. The truth table (Table 2) shows
the appropriate functions associated with the states of
the control logic inputs.
The DACs themselves are implemented with a preci-
sion thin–film resistor network and CMOS transmis-
sion gate switches. Each D/A converter is used to
convert the 12–bit input from its DAC register to a
precision voltage.
The bipolar voltage output of the SP9504 is created
on-chip from the DAC Voltage Output (VDAC) by
using an operational amplifier and two feedback
resistors connected as shown in Figure 2. This
configurationproducesa+4.5Vbipolaroutput range
with standard offset binary coding.
SP9504DS/03
SP9504 Quad, 12-Bit, Voltage Output D/A Converter
5
© Copyright 2000 Sipex Corporation
5 Page 
ORDERING INFORMATION
Model
Temperature Range
Package
Monolithic 12-Bit Quad DAC Voltage Output:
SP9504JP .................................................................................. 0˚C to +70˚C ...................................................................... 28-pin, 0.6" Plastic DIP
SP9504KP ................................................................................. 0˚C to +70˚C ...................................................................... 28-pin, 0.6" Plastic DIP
SP9504JS .................................................................................. 0˚C to +70˚C ............................................................................. 28–pin, 0.35" SOIC
SP9504KS ................................................................................. 0˚C to +70˚C ............................................................................. 28–pin, 0.35" SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: [email protected]
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
SP9504DS/03
SP9504 Quad, 12-Bit, Voltage Output D/A Converter
11
© Copyright 2000 Sipex Corporation
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SP9504.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SP9500 | 12-Bit / Voltage Output D/A Converter | Sipex |
| SP9501 | 12-Bit / Voltage Output D/A Converter | Sipex |
| SP9502 | Voltage Output D/A Converter |  Sipex Corporation |
| SP9504 | Quad / 12-Bit / Voltage Output D/A Converter | Sipex |
| 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 |