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PDF DAC7621E Data sheet ( Hoja de datos )

Número de pieza DAC7621E
Descripción 12-Bit/ Parallel Input DIGITAL-TO-ANALOG CONVERTER
Fabricantes Burr-Brown Corporation 
Logotipo Burr-Brown Corporation Logotipo



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®
DAC7621 ®
DAC7621
For most current data sheet and other product
information, visit www.burr-brown.com
12-Bit, Parallel Input
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q LOW POWER: 2.5mW
q FAST SETTLING: 7µs to 1 LSB
q 1mV LSB WITH 4.095V FULL-SCALE
RANGE
q COMPLETE WITH REFERENCE
q 12-BIT LINEARITY AND MONOTONICITY
OVER INDUSTRIAL TEMP RANGE
q ASYNCHRONOUS RESET TO 0V
APPLICATIONS
q PROCESS CONTROL
q DATA ACQUISITION SYSTEMS
q CLOSED-LOOP SERVO-CONTROL
q PC PERIPHERALS
q PORTABLE INSTRUMENTATION
DESCRIPTION
The DAC7621 is a 12-bit digital-to-analog converter
(DAC) with guaranteed 12-bit monotonicity perfor-
mance over the industrial temperature range. It re-
quires a single +5V supply and contains an input
register, latch, 2.435V reference, DAC, and high speed
rail-to-rail output amplifier. For a full-scale step, the
output will settle to 1 LSB within 7µs. The device
consumes 2.5mW (0.5mA at 5V).
The parallel interface is compatible with a wide variety
of microcontrollers. The DAC7621 accepts a 12-bit
parallel word, has a double-buffered input logic struc-
ture and provides data readback. In addition, two
control pins provide a chip select (CS) function and
asynchronous clear (CLR) input. The CLR input can
be used to ensure that the DAC7621 output is 0V on
power-up or as required by the application.
The DAC7621 is available in a 20-lead SSOP package
and is fully specified over the industrial temperature
range of –40°C to +85°C.
VDD
CLR
LOADDAC
Ref
CS
R/W
12-Bit DAC
12
DAC Register
12
Input Register
12
I/O Buffer
VOUT
DAC7621
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11
DGND
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1998 Burr-Brown Corporation
PDS-1502B
Printed in U.S.A. March, 1999

1 page




DAC7621E pdf
TYPICAL PERFORMANCE CURVES
At TA = +25°, and VDD = 5V, unless otherwise specified.
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
10
OUTPUT SWING vs LOAD
100 1k 10k
Load Resistance ()
100k
PULL-DOWN VOLTAGE vs OUTPUT SINK CURRENT
1k
100 85°C (mV)
10 25°C
1
0.1
0.01
0.001
0.01
–40°C
0.1 1
Current (mA)
Data = 000H
10 100
BROADBAND NOISE
Code = FFFH
BW = 2MHz
Time (2µs/div)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5
SUPPLY CURRENT vs LOGIC INPUT VOLTAGE
4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5
Logic Voltage (V)
POWER SUPPLY REJECTION vs FREQUENCY
70
Data = FFFH
60 VDD = 5V
±200mV AC
50
40
30
20
10
0
10
100 1k 10k 100k 1M
Frequency (Hz)
5.0
4.8
4.6
4.4
4.2
4.0
0.010
MINIMUM SUPPLY VOLTAGE vs LOAD
VFS = 1 LSB
Data = FFFH
0.100
1.000
Output Load Current (mA)
10.000
®
5 DAC7621

5 Page





DAC7621E arduino
APPLICATIONS
POWER AND GROUNDING
The DAC7621 can be used in a wide variety of situations—
from low power, battery operated systems to large-scale
industrial process control systems. In addition, some appli-
cations require better performance than others, or are par-
ticularly sensitive to one or two specific parameters. This
diversity makes it difficult to define definite rules to follow
concerning the power supply, bypassing, and grounding.
The following discussion must be considered in relation to
the desired performance and needs of the particular system.
A precision analog component requires careful layout, ad-
equate bypassing, and a clean, well-regulated power supply.
As the DAC7621 is a single-supply, +5V component, it will
often be used in conjunction with digital logic,
microcontrollers, microprocessors, and digital signal proces-
sors. The more digital logic present in the design and the
higher the switching speed, the more difficult it will be to
achieve good performance.
The DAC7621 has separate analog ground and digital ground
pins. The current through DGND is mostly switching tran-
sients and are up to 4mA peak in amplitude. The current
through AGND is typically 0.5mA.
For best performance, separate analog and digital ground
planes with a single interconnection point to minimize
ground loops. The analog pins are located adjacent to each
other to help isolate analog from digital signals. Analog
signals should be routed as far as possible from digital
signals and should cross them at right angles. A solid analog
ground plane around the D/A package, as well as under it in
the vicinity of the analog and power supply pins, will isolate
the D/A from switching currents. It is recommended that
DGND and AGND be connected directly to the ground
planes under the package.
If several DAC7621s are used, or if sharing supplies with
other components, connecting the AGND and DGND lines
together at the power supplies once, rather than at each chip,
may produce better results.
The power applied to VDD should be well regulated and low-
noise. Switching power supplies and DC/DC converters will
often have high-frequency glitches or spikes riding on the
output voltage. In addition, digital components can create
similar high frequency spikes as their internal logic switches
states. This noise can easily couple into the DAC output
voltage through various paths between VDD and VOUT.
As with the GND connection, VDD should be connected to
a +5V power supply plane or trace that is separate from the
connection for digital logic until they are connected at the
power entry point. In addition, the 10µF and 0.1µF capaci-
tors shown in Figure 4 are strongly recommended and
should be installed as close to VDD and ground as possible.
In some situations, additional bypassing may be required
such as a 100µF electrolytic capacitor or even a “Pi” filter
made up of inductors and capacitors—all designed to essen-
tially lowpass filter the +5V supply, removing the high
frequency noise (see Figure 4).
+5V
Power
Supply
+5V
GND
Digital Circuits
+5V
GND
+
100µF
Optional
+
10µF
0.1µF
Other
Analog
Components
DAC7621
VDD
AGND
DGND
FIGURE 4. Suggested Power and Ground Connections for a DAC7621 Sharing a +5V Supply with a Digital System with a
Single Ground Plane.
®
11 DAC7621

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