REV. F
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AD5305/AD5315/AD5325
*
2.5 V to 5.5 V, 500 H9262A, 2-Wire Interface
Quad Voltage Output, 8-/10-/12-Bit DACs
*Protected by U.S.Patent No. 5,969,657and 5,684,481.
FEATURES
AD5305: 4 Buffered 8-Bit DACs in 10-Lead MSOP
A Version: H115501 LSB INL, B Version: H115500.625 LSB INL
AD5315: 4 Buffered 10-Bit DACs in 10-Lead MSOP
A Version: H115504 LSB INL, B Version: H115502.5 LSB INL
AD5325: 4 Buffered 12-Bit DACs in 10-Lead MSOP
A Version: H1155016 LSB INL, B Version: H1155010 LSB INL
Low Power Operation: 500 H9262A @ 3 V, 600 H9262A @ 5 V
2-Wire (I
2
C
®
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 Amplifiers
Temperature Range –40H11543C to +105H11543C
APPLICATIONS
Portable Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
Industrial Process Control
FUNCTIONAL BLOCK DIAGRAM
INPUT
REGISTER
V
OUT
A
BUFFER
DAC
REGISTER
STRING
DAC A
V
DD
REF IN
GND
AD5305/AD5315/AD5325
INPUT
REGISTER
V
OUT
BBUFFER
DAC
REGISTER
INPUT
REGISTER
V
OUT
CBUFFER
DAC
REGISTER
INPUT
REGISTER
V
OUT
DBUFFER
DAC
REGISTER
POWER-ON
RESET
SDA
SCL
A0
INTERFACE
LOGIC
POWER-DOWN
LOGIC
LDAC
STRING
DAC B
STRING
DAC C
STRING
DAC D
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 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 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 µW in power-down mode.