DAC7678_10 Datasheet, PDF (1/52 Pages) Texas Instruments – 12-Bit, Octal-Channel, Ultra-Low Glitch, Voltage Output, Two-Wire Interface Digital-to-Analog Converter with 2.5V Internal Reference

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
FEATURES
1
•23 Relative Accuracy:
– 1 LSB INL
• Glitch Energy: 0.15nV-s
• Internal Reference:
– 2.5V Reference Voltage (disabled by
default)
– ±5mV Initial Accuracy (max)
– 5ppm/°C Temperature Drift (typ)
– 25ppm/°C Temperature Drift (max)
– 20mA Sink/Source Capability
• 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)
• Wide Power-Supply Range: +2.7V to +5.5V
• 2-Wire Serial Interface ( I²C™ compatible)
• On-Chip Output Buffer Amplifier with
Rail-to-Rail Operation
• Temperature Range: –40°C to +125°C
AV_DD
DAC7678
V_REFIN/V_REFOUT
2.5V
Reference
Data Buffer H
DAC Register H
12-Bit DAC
V_OUTH
Data Buffer G
DAC Register G
12-Bit DAC
V_OUTG
Data Buffer F
DAC Register F
12-Bit DAC
V_OUTF
Data Buffer E
DAC Register E
12-Bit DAC
V_OUTE
Data Buffer D
DAC Register D
12-Bit DAC
V_OUTD
Data Buffer C
DAC Register C
12-Bit DAC
V_OUTC
Data Buffer B
DAC Register B
12-Bit DAC
V_OUTB
Data Buffer A
DAC Register A
12-Bit DAC
V_OUTA
SCL
SDA
Input Control Logic
Buffer Control
Register Control
Control Logic
Power-Down
Control Logic
ADDR0
ADDR1
LDAC RSTSEL CLR
GND
APPLICATIONS
• Portable Instrumentation
• Closed-Loop Servo-Control
• Process Control
• Data Acquisition Systems
• Programmable Attenuation
• PC Peripherals
DESCRIPTION
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
V_REFIN/V_REFOUT pin. The device is monotonic,
provides very good linearity, and minimizes undesired
code-to-code transient voltages (glitch).
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.
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
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
Pin- and Function-Compatible
(w/internal reference)
Pin- and Function-Compatible
8-BIT
10-BIT
12-BIT
—
—
DAC7678
DAC5578 DAC6578 DAC7578
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.
I²C is a trademark of NXP Semiconductors.
2
All other trademarks are the property of their respective owners.
3
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