DAC7728 Datasheet, PDF (1/54 Pages) Texas Instruments – Octal, 12-Bit, Low-Power, High-Voltage Output, Parallel Input DIGITAL-TO-ANALOG CONVERTER

DAC7728
DAC7728
DAC7728
www.ti.com
SBAS461A – JUNE 2009 – REVISED NOVEMBER 2009
Octal, 12-Bit, Low-Power, High-Voltage Output, Parallel Input
DIGITAL-TO-ANALOG CONVERTER
Check for Samples: DAC7728
FEATURES
1
•2 Bipolar Output: ±3V, up to ±16.5V
• Unipolar Output: 0V to +33V
• 12-Bit Resolution
• Low Power: 13.5mW/Ch
• Relative Accuracy: 1LSB Max
• Flexible User Calibration
• Low Zero/Gain Error: ±1 LSB Max
• Low Glitch: 4nV-s
• Settling Time: 15μs
• Channel Monitor Output
• Programmable Gain: x4, x6
• Programmable Offset
• 12-Bit Parallel Interface:
50MHz (Write Operation)
• Packages: QFN-56 (8mm x 8mm),
TQFP-64 (10mm x 10mm)
APPLICATIONS
• Automatic Test Equipment
• PLC and Industrial Process Control
• Communications
IOV_DD DGND DV_DD
AV_DD
AV_SS
REF-A
DAC7728
Analog Monitor
V_OUT-0
A0
A4
R/W
CS
D0
D11
RST
RSTSEL
LDAC
CLR
USB/BTC
BUSY
GPIO
Reference
Command
Buffer A
Registers
To DAC-0, DAC-1,
DAC-2, DAC-3
(When Correction Engine Disabled)
OFFSET
DAC A
V_OUT-7
Ref Buffer A
Ref Buffer B
OFFSET-B
Input Data
Register 0
Correction
Engine
User Calibration:
Zero Register 0
Gain Regsiter 0
DAC-0
Data
DAC-0
Latch-0
LDAC
To DAC-0, DAC-1,
DAC-2, DAC-3
Internal Trimming
Zero/Gain; INL
To DAC-4, DAC-5, DAC-6, DAC-7
(Same Function Blocks
for All Channels)
Reference
Buffer B
OFFSET
DAC B
Power-Up/
Power-Down
Control
V_MON
OFFSET-A
V_OUT-0
AGND-A
OFFSET-B
V_OUT-7
AGND-B
REF-B
DESCRIPTION
The DAC7728 is a low-power, octal, 12-bit
digital-to-analog converter (DAC). With a 5V
reference, the output can either be a bipolar ±15V
voltage when operating from a dual ±15.5V (or
higher) power supply, or a unipolar 0V to +30V
voltage when operating from a +30.5V power supply.
With a 5.5V reference, the output can either be
±16.5V for a dual ±17V (or higher) power supply, or a
unipolar 0V to +33V voltage when operating from a
+33.5V (or higher) power supply. This DAC provides
low-power operation, good linearity, and low glitch
over the specified temperature range of –40°C to
+105°C. This device is trimmed in manufacturing and
has very low zero and full-scale error. In addition,
user calibration can be performed over the entire
signal chain. The output range can be offset by using
the DAC Offset Register.
The DAC7728 features a standard, high-speed, 12-bit
parallel interface that operates at up to 50MHz and is
1.8V, 3V, and 5V logic compatible, to communicate
with a DSP or microprocessor. The eight DACs and
the auxiliary registers are addressed with five address
lines. The device features double-buffered interface
logic. An asynchronous load input (LDAC) transfers
data from the DAC data register to the DAC latch.
The asynchronous CLR input sets the output of all
eight DACs to AGND. The V_MON pin is a monitor
output that connects to the individual analog outputs,
the offset DAC, and the reference buffer outputs
through a multiplexer (mux).
The DAC7728 is pin-to-pin compatible with the
DAC8728 (16-bit) and the DAC8228 (14-bit).
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.
All trademarks are the property of their respective owners.
2
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