DAC7678
www.ti.com
SBAS493A –FEBRUARY 2010–REVISED AUGUST 2010
12-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output, Two-Wire Interface
Digital-to-Analog Converter with 2.5V Internal Reference
Check for Samples: DAC7678
1
FEATURES
APPLICATIONS
•
•
•
•
•
•
Portable Instrumentation
Closed-Loop Servo-Control
Process Control
Data Acquisition Systems
Programmable Attenuation
PC Peripherals
23
•
Relative Accuracy:
–
1 LSB INL
•
•
Glitch Energy: 0.15nV-s
Internal Reference:
–
2.5V Reference Voltage (disabled by
default)
–
–
–
–
±5mV Initial Accuracy (max)
DESCRIPTION
5ppm/°C Temperature Drift (typ)
25ppm/°C Temperature Drift (max)
20mA Sink/Source Capability
The DAC7678 is a low-power, voltage-output, octal
channel, 12-bit digital-to-analog converter (DAC). The
DAC7678 includes a 2.5V internal reference (disabled
by default), giving a full-scale output voltage range of
5V. The internal reference has an initial accuracy of
±5mV and can source up to 20mA at the
VREFIN/VREFOUT pin. The device is monotonic,
provides very good linearity, and minimizes undesired
code-to-code transient voltages (glitch).
•
•
Power-On Reset to Zero Scale or Midscale
–
Devices in the TSSOP Package Reset to
Zero Scale
–
Devices in the QFN Package Reset to Zero
Scale or Midscale
Ultra-Low Power Operation: 0.13mA/Channel
at 5V (without internal reference current)
The DAC7678 uses a versatile, 2-wire serial interface
that is I2C-compatible and operates at clock rates of
up to 3.4MHz. Multiple devices can share the same
bus.
•
•
•
Wide Power-Supply Range: +2.7V to +5.5V
2-Wire Serial Interface ( I2C™ compatible)
The DAC7678 incorporates a power-on-reset circuit
that ensures the DAC output powers up to either
zero-scale or mid-scale until a valid code is written to
the device. These devices contain a power-down
feature, accessed over the serial interface that
reduces the current consumption of the device to
typically 0.42mA at 5V. Power consumption (including
internal reference) is typically 3.56mW at 3V,
reducing to 0.68mW in power-down mode. The low
power consumption, internal reference, and small
footprint make this device ideal for portable,
battery-operated equipment. The DAC7678 is drop-in
On-Chip Output Buffer Amplifier with
Rail-to-Rail Operation
•
Temperature Range: –40°C to +125°C
AVDD
VREFIN/VREFOUT
DAC7678
2.5V
Reference
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-Bit DAC
12-Bit DAC
12-Bit DAC
12-Bit DAC
12-Bit DAC
12-Bit DAC
12-Bit DAC
12-Bit DAC
E
D
C
B
A
and
functionally
compatible
with
DAC5578,
DAC6578, and DAC7578. All devices are available in
a 4x4 QFN-24 package and a TSSOP-16 package.
RELATED DEVICES
8-BIT
10-BIT
12-BIT
Pin- and Function-Compatible
(w/internal reference)
—
—
DAC7678
SCL
SDA
Input Control Logic
Buffer Control
Register Control
Pin- and Function-Compatible
DAC5578 DAC6578 DAC7578
Power-Down
Control Logic
Control Logic
ADDR0
ADDR1
LDAC
RSTSEL
CLR
GND
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
I2C is a trademark of NXP Semiconductors.
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 © 2010, Texas Instruments Incorporated