DAC7568
DAC8168
DAC8568
www.ti.com ..................................................................................................................................................... SBAS430A–JANUARY 2009–REVISED APRIL 2009
12-/14-/16-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output
DIGITAL-TO-ANALOG CONVERTERS with 2.5V, 2ppm/°C Internal Reference
1
FEATURES
APPLICATIONS
•
•
•
•
Portable Instrumentation
Closed-Loop Servo-Control/Process Control
Data Acquisition Systems
Programmable Attenuation, Digital Gain, and
Offset Adjustment
Programmable Voltage and Current Sources
234
• Relative Accuracy:
– DAC7568 (12-Bit): 0.3 LSB INL
– DAC8168 (14-Bit): 1 LSB INL
– DAC8568 (16-Bit): 4 LSB INL
•
Glitch Energy: 0.1nV-s
Internal Reference:
•
•
– 2.5V Reference Voltage (disabled by
default)
DESCRIPTION
The DAC7568, DAC8168, and DAC8568 are
low-power, voltage-output, eight-channel, 12-, 14-,
and 16-bit digital-to-analog converters (DACs),
respectively. These devices include a 2.5V, 2ppm/°C
internal reference (disabled by default), giving a
full-scale output voltage range of 2.5V or 5V. The
internal reference has an initial accuracy of 0.004%
and can source up to 20mA at the VREFIN/VREFOUT
pin. These devices are monotonic, providing excellent
linearity and minimizing undesired code-to-code
transient voltages (glitch). They use a versatile 3-wire
serial interface that operates at clock rates up to
50MHz. The interface is compatible with standard
SPI™, QSPI™, Microwire™, and digital signal
processor (DSP) interfaces.
– 0.004% Initial Accuracy (typ)
– 2ppm/°C Temperature Drift (typ)
– 5ppm/°C Temperature Drift (max)
– 20mA Sink/Source Capability
•
•
Power-On Reset to Zero Scale or Midscale
Ultra-Low Power Operation: 1.25mA at 5V
Including Internal Reference Current
•
•
•
Wide Power-Supply Range: +2.7V to +5.5V
Monotonic Over Entire Temperature Range
Low-Power Serial Interface with
Schmitt-Triggered Inputs: Up to 50MHz
•
•
On-Chip Output Buffer Amplifier with
Rail-to-Rail Operation
The DAC7568, DAC8168, and DAC8568 incorporate
a power-on-reset circuit that ensures the DAC output
powers up at either zero scale or midscale until a
valid code is written to the device. These devices
contain a power-down feature, accessed over the
serial interface, that reduces current consumption to
typically 0.18µA at 5V. Power consumption (including
internal reference) is typically 2.9mW at 3V, reducing
to less than 1µW in power-down mode. The low
power consumption, internal reference, and small
footprint make these devices ideal for portable,
battery-operated equipment.
Temperature Range: –40°C to +125°C
AVDD
VREFIN/VREFOUT
DAC7568
DAC8168
DAC8568
2.5V
Reference
12-/14-/16-Bit
DAC
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
H
G
F
DAC Register H
DAC Register G
DAC Register F
DAC Register E
DAC Register D
DAC Register C
DAC Register B
DAC Register A
Data Buffer H
Data Buffer G
Data Buffer F
Data Buffer E
Data Buffer D
Data Buffer C
Data Buffer B
Data Buffer A
12-/14-/16-Bit
DAC
12-/14-/16-Bit
DAC
12-/14-/16-Bit
DAC
E
D
C
B
A
12-/14-/16-Bit
DAC
12-/14-/16-Bit
DAC
The DAC7568, DAC8168, and DAC8568 are drop-in
and function-compatible with each other, and are
available in TSSOP-16 and TSSOP-14 packages.
12-/14-/16-Bit
DAC
12-/14-/16-Bit
DAC
SYNC
SCLK
DIN
32-Bit Shift Register
Buffer Control
Register Control
Power-Down
Control Logic
DEVICE COMPARISON
12-BIT
14-BIT
16-BIT
Control Logic
Pin- and
Function-Compatible
DAC7568
DAC8168
DAC8568
GND
LDAC
CLR
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
3
4
SPI, QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated
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