DAC8512FP Datasheet PDF - Analog Devices
| Part Number | DAC8512FP | |
| Description | % V/ Serial Input Complete 12-Bit DAC | |
| Manufacturers | Analog Devices | |
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There is a preview and DAC8512FP download ( pdf file ) link at the bottom of this page. Total 20 Pages | ||
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a
FEATURES
Space Saving SO-8 or Mini-DIP Packages
Complete, Voltage Output with Internal Reference
1 mV/Bit with 4.095 V Full Scale
Single +5 Volt Operation
No External Components
3-Wire Serial Data Interface, 20 MHz Data Loading Rate
Low Power: 2.5 mW
APPLICATIONS
Portable Instrumentation
Digitally Controlled Calibration
Servo Controls
Process Control Equipment
PC Peripherals
+5 V, Serial Input
Complete 12-Bit DAC
DAC8512
FUNCTIONAL BLOCK DIAGRAM
CLR 6
LD 5
CS 2
CLK 3
SDI 4
REF
12-BIT DAC
12
DAC REGISTER
12
SERIAL REGISTER
1 VDD
8 VOUT
7 GND
GENERAL DESCRIPTION
The DAC8512 is a complete serial input, 12-bit, voltage output
digital-to-analog converter designed to operate from a single
+5 V supply. It contains the DAC, input shift register and
latches, reference and a rail-to-rail output amplifier. Built using
a CBCMOS process, these monolithic DACs offer the user low
cost, and ease of use in +5 V only systems.
Coding for the DAC8512 is natural binary with the MSB loaded
first. The output op amp can swing to either rail and is set to a
range of 0 V to +4.095 V—for a one-millivolt-per-bit resolution.
It is capable of sinking and sourcing 5 mA. An on-chip reference
is laser trimmed to provide an accurate full-scale output voltage
of 4.095 V.
Serial interface is high speed, three-wire, DSP compatible with
data in (SDI), clock (CLK) and load strobe (LD). There is also
a chip-select pin for connecting multiple DACs.
A CLR input sets the output to zero scale at power on or upon
user demand.
The DAC8512 is specified over the extended industrial (–40°C
to +85°C) temperature range. DAC8512s are available in plas-
tic DIPs and SO-8 surface mount packages.
1.0
0.75
0.5
0.25
0
–0.25
–0.5
–0.75
–1.0
0
1024
2048
3072
DIGITAL INPUT CODE – Decimal
Linearity Error vs. Digital Input Code
4096
REV. A
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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1996
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DAC8512
PIN CONFIGURATIONS
SO-8
P-DIP-8 & Cerdip-8
VDD 1
8 VOUT
CS 2 DAC8512 7 GND
CLK 3 TOP VIEW 6 CLR
(Not to Scale)
SDI 4
5 LD
VDD 1
CS 2
CLK 3
SDI 4
DAC8512
TOP VIEW
(Not to Scale)
8 VOUT
7 GND
6 CLR
5 LD
PIN DESCRIPTIONS
Pin Name Description
1 VDD Positive Supply. Nominal value +5 V, ± 5%.
2 CS Chip Select. Active low input.
3 CLK Clock input for the internal serial input shift register.
4 SDI Serial Data Input. Data on this pin is clocked into the
internal serial register on positive clock edges of the
CLK pin. The Most Significant Bit (MSB) is loaded
first.
5 LD Active low input which writes the serial register data
into the DAC register. Asynchronous input.
6 CLR Active low digital input that clears the DAC register to
zero, setting the DAC to minimum scale. Asynchronous
input.
7 GND Analog ground for the DAC. This also serves as the
digital logic ground reference voltage.
8 VOUT Voltage output from the DAC. Fixed output voltage
range of 0 V to 4.095 V with 1 mV/LSB. An internal
temperature stabilized reference maintains a fixed
full-scale voltage independent of time, temperature and
power supply variations.
DICE CHARACTERISTICS
VDD
1
VOUT
8
7 GND
7 GND
6 CLR
CS 2
CLK 3
45
SDI LD
SUBSTRATE IS COMMON WITH VDD.
NUMBER OF TRANSISTORS : 642
DIE SIZE: 0.055 inch × 0.106 inch; 5830 sq mils
OPERATION
The DAC8512 is a complete ready to use 12-bit digital-to-analog
converter. It contains a voltage-switched, 12-bit, laser-trimmed
DAC, a curvature-corrected bandgap reference, a rail-to-rail
output op amp, a DAC register, and a serial data input register.
The serial data interface consists of a CLK, serial data in (SDI),
and a load strobe (LD). This basic 3-wire interface offers maxi-
mum flexibility for interface to the widest variety of serial data
input loading requirements. In addition a CS select is provided
for multiple packaging loading and a power on reset CLR pin to
simplify start or periodic resets.
D/A CONVERTER SECTION
The DAC is a 12-bit voltage mode device with an output that
swings from GND potential to the 2.5 volt internal bandgap
voltage. It uses a laser trimmed R-2R ladder which is switched
by N channel MOSFETs. The output voltage of the DAC has a
constant resistance independent of digital input code. The DAC
output is internally connected to the rail-to-rail output op amp.
AMPLIFIER SECTION
The DAC’s output is buffered by a low power consumption pre-
cision amplifier. This amplifier contains a differential PNP pair
input stage which provides low offset voltage and low noise, as
well as the ability to amplify the zero-scale DAC output volt-
ages. The rail-to-rail amplifier is configured in a gain of 1.6384
(= 4.095 V/2.5 V) in order to set the 4.095 volt full-scale output
(1 mV/LSB). See Figure 3 for an equivalent circuit schematic of
the analog section.
BANDGAP
REFERENCE
VOLTAGE SWITCHED 12-BIT
R-2R D/A CONVERTER
2R
RAIL-TO-RAIL
OUTPUT
AMPLIFIER
BUFFER
2.5V
R
2R
R
2R
R2
R1
VOUT
AV = 4.095/2.5
= 1.638V/V
SPDT
N-CH FET
SWITCHES
2R
2R
Figure 3. Equivalent DAC8512 Schematic of Analog
Portion
The op amp has a 16 µs typical settling time to 0.01%. There
are slight differences in settling time for negative slowing signals
vs. positive. See the oscilloscope photos in the typical perfor-
mances section of this data sheet.
REV. A
–5–
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DAC8512FP electronic component. |
| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DAC8512FP.PDF Datasheet ] | |
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