AD5312_15 Datasheet, PDF (1/24 Pages) Analog Devices – 2.5 V to 5.5 V, 230 A, Dual Rail-to-Rail, Voltage Output 8-/10-/12-Bit DACs

2.5 V to 5.5 V, 230 μA, Dual Rail-to-Rail,
Voltage Output 8-/10-/12-Bit DACs
AD5302/AD5312/AD5322
FEATURES
GENERAL DESCRIPTION
AD5302: Two 8-bit buffered DACs in 1 package
A version: ±1 LSB INL, B version: ±0.5 LSB INL
AD5312: Two 10-bit buffered DACs in 1 package
A version: ±4 LSB INL, B version: ±2 LSB INL
AD5322: Two 12-bit buffered DACs in 1 package
A version: ±16 LSB INL, B version: ±8 LSB INL
10-lead MSOP
Micropower operation: 300 μA @ 5 V (including
reference current)
The AD5302/AD5312/AD5322 are dual 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 230 μA at 3 V.
Their on-chip output amplifiers allow the outputs to swing rail-
to-rail with a slew rate of 0.7 V/μs. The AD5302/AD5312/AD5322
utilize a versatile 3-wire serial interface that operates at clock
rates up to 30 MHz and is compatible with standard SPI®,
QSPI™, MICROWIRE™, and DSP interface standards.
Power-down to 200 nA @ 5 V, 50 nA @ 3 V
The references for the two DACs are derived from two reference
2.5 V to 5.5 V power supply
pins (one per DAC). The reference inputs can be configured as
Double-buffered input logic
buffered or unbuffered inputs. The outputs of both DACs can be
Guaranteed monotonic by design over all codes
updated simultaneously using the asynchronous LDAC input.
Buffered/Unbuffered reference input options
The parts incorporate a power-on reset circuit, which ensures
0 V to VREF output voltage
that the DAC outputs power-up to 0 V and remain there until a
Power-on-reset to 0 V
valid write takes place to the device. The parts contain a power-
Simultaneous update of DAC outputs via LDAC
down feature that reduces the current consumption of the
Low power serial interface with Schmitt-triggered inputs
On-chip rail-to-rail output buffer amplifiers
devices to 200 nA at 5 V (50 nA at 3 V) and provides software-
selectable output loads while in power-down mode.
Qualified for automotive applications
The low power consumption of these parts in normal operation
APPLICATIONS
makes them ideally suited for portable battery-operated
Portable battery-powered instruments
Digital gain and offset adjustment
equipment. The power consumption is 1.5 mW at 5 V, 0.7 mW
at 3 V, reducing to 1 μW in power-down mode.
Programmable voltage and current sources
Programmable attenuators
FUNCTIONAL BLOCK DIAGRAM
V_DD
V_REFA
POWER-ON
RESET
AD5302/AD5312/AD5322
SYNC
SCLK
DIN
INPUT
REGISTER
INTERFACE
LOGIC
DAC
REGISTER
STRING
DAC
BUFFER
POWER-DOWN
LOGIC
INPUT
REGISTER
DAC
REGISTER
STRING
DAC
BUFFER
V_OUTA
RESISTOR
NETWORK
V_OUTB
LDAC
V_REFB
Figure 1.
RESISTOR
NETWORK
GND
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone] © 2006-2011 Analog Devices, Inc. All rights reserved.