2.5 V to 5.5 V, 500 A, 2-Wire Interface
Quad Voltage Output, 8-/10-/12-Bit DACs
AD5305/AD5315/AD5325*
FEATURES
GENERAL DESCRIPTION
AD5305: 4 Buffered 8-Bit DACs in 10-Lead MSOP
A Version: ؎1 LSB INL, B Version: ؎0.625 LSB INL
AD5315: 4 Buffered 10-Bit DACs in 10-Lead MSOP
A Version: ؎4 LSB INL, B Version: ؎2.5 LSB INL
AD5325: 4 Buffered 12-Bit DACs in 10-Lead MSOP
A Version: ؎16 LSB INL, B Version: ؎10 LSB INL
Low Power Operation: 500 A @ 3 V, 600 A @ 5 V
2-Wire (I2C® Compatible) Serial Interface
2.5 V to 5.5 V Power Supply
Guaranteed Monotonic by Design over All Codes
Power-Down to 80 nA @ 3 V, 200 nA @ 5 V
Three Power-Down Modes
Double-Buffered Input Logic
Output Range: 0 V to VREF
The AD5305/AD5315/AD5325 are quad 8-, 10-, and 12-bit
buffered voltage output DACs in a 10-lead MSOP that operate
from a single 2.5 V to 5.5 V supply, consuming 500 µA at 3 V.
Their on-chip output amplifiers allow rail-to-rail output swing
with a slew rate of 0.7 V/µs. A 2-wire serial interface, which
operates at clock rates up to 400 kHz, is used. This interface is
SMBus compatible at VDD < 3.6 V. Multiple devices can be
placed on the same bus.
The references for the four DACs are derived from one reference
pin. The outputs of all DACs may be updated simultaneously
using the software LDAC function. The parts incorporate a
power-on reset circuit, which ensures that the DAC outputs power
up to 0 V and remain there until a valid write takes place to the
device. There is also a software clear function that resets all input
and DAC registers to 0 V. The parts contain a power-down
feature that reduces the current consumption of the devices to
200 nA @ 5 V (80 nA @ 3 V).
Power-On Reset to 0 V
Simultaneous Update of Outputs (LDAC Function)
Software Clear Facility
Data Readback Facility
The low power consumption of these parts in normal operation
makes them ideally suited to portable battery-operated equipment.
The power consumption is 3 mW at 5 V, 1.5 mW at 3 V, reducing
to 1 µW in power-down mode.
On-Chip Rail-to-Rail Output Buffer Amplifiers
Temperature Range –40؇C to +105؇C
APPLICATIONS
Portable Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
Industrial Process Control
FUNCTIONAL BLOCK DIAGRAM
V
REF IN
DD
LDAC
DAC
INPUT
STRING
DAC A
V
V
V
V
A
B
C
D
BUFFER
BUFFER
OUT
OUT
OUT
OUT
REGISTER
REGISTER
DAC
REGISTER
INPUT
REGISTER
SCL
SDA
STRING
DAC B
INTERFACE
LOGIC
DAC
REGISTER
INPUT
REGISTER
STRING
DAC C
BUFFER
BUFFER
A0
DAC
REGISTER
INPUT
REGISTER
STRING
DAC D
POWER-DOWN
LOGIC
POWER-ON
RESET
AD5305/AD5315/AD5325
GND
*Protected by U.S.Patent No. 5,969,657and 5,684,481.
REV. F
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reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
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