2.5 V to 5.5 V, 500 A, 2-Wire Interface
Quad Voltage Output, 8-/10-/12-Bit DACs
AD5305/AD5315/AD5325
*
FEATURES
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 (I
2
C
廬
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 V
REF
Power-On Reset to 0 V
Simultaneous Update of Outputs (LDAC Function)
Software Clear Facility
Data Readback Facility
On-Chip Rail-to-Rail Output Buffer Ampli鏗乪rs
Temperature Range 鈥?0 C to +105 C
GENERAL DESCRIPTION
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
碌A
at 3 V.
Their on-chip output ampli鏗乪rs allow rail-to-rail output swing
with a slew rate of 0.7 V/碌s. A 2-wire serial interface, which
operates at clock rates up to 400 kHz, is used. This interface is
SMBus compatible at V
DD
< 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).
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
碌W
in power-down mode.
APPLICATIONS
Portable Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
Industrial Process Control
FUNCTIONAL BLOCK DIAGRAM
V
DD
LDAC
REF IN
INPUT
REGISTER
DAC
REGISTER
STRING
DAC A
BUFFER
V
OUT
A
SCL
SDA
INTERFACE
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC B
BUFFER
V
OUT
B
A0
INPUT
REGISTER
DAC
REGISTER
STRING
DAC C
BUFFER
V
OUT
C
INPUT
REGISTER
DAC
REGISTER
STRING
DAC D
BUFFER
V
OUT
D
POWER-ON
RESET
AD5305/AD5315/AD5325
GND
POWER-DOWN
LOGIC
*Protected
by U.S.Patent No. 5,969,657and 5,684,481.
REV. F
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