AD5320 Datasheet, PDF (1/12 Pages) Analog Devices – +2.7 V to +5.5 V, 140 uA, Rail-to-Rail Output 12-Bit DAC in a SOT-23

a +2.7 V to +5.5 V, 140 ␮A, Rail-to-Rail Output
12-Bit DAC in a SOT-23
AD5320*
FEATURES
Single 12-Bit DAC
6-Lead SOT-23 and 8-Lead ␮SOIC Packages
Micropower Operation: 140 ␮A @ 5 V
Power-Down to 200 nA @ 5 V, 50 nA @ 3 V
+2.7 V to +5.5 V Power Supply
Guaranteed Monotonic by Design
Reference Derived from Power Supply
Power-On-Reset to Zero Volts
Three Power-Down Functions
Low Power Serial Interface with Schmitt-Triggered
Inputs
On-Chip Output Buffer Amplifier, Rail-to-Rail Operation
SYNC Interrupt Facility
APPLICATIONS
Portable Battery Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
FUNCTIONAL BLOCK DIAGRAM
V_{DD GND}
POWER-ON
RESET
AD5320
DAC
REGISTER
REF (+) REF (–)
12-BIT
DAC
OUTPUT
BUFFER
V_OUT
INPUT
CONTROL
LOGIC
POWER-DOWN
CONTROL LOGIC
RESISTOR
NETWORK
SYNC SCLK DIN
GENERAL DESCRIPTION
The AD5320 is a single, 12-bit buffered voltage out DAC that
operates from a single +2.7 V to +5.5 V supply consuming
115 µA at 3 V. Its on-chip precision output amplifier allows
rail-to-rail output swing to be achieved. The AD5320 utilizes a
versatile three-wire serial interface that operates at clock rates up
to 30 MHz and is compatible with standard SPI™, QSPI™,
MICROWIRE™ and DSP interface standards.
The reference for AD5320 is derived from the power supply
inputs and thus gives the widest dynamic output range. The part
incorporates a power-on-reset circuit that ensures that the DAC
output powers up to zero volts and remains there until a valid
write takes place to the device. The part contains a power-down
feature that reduces the current consumption of the device to
200 nA at 5 V and provides software selectable output loads
while in power-down mode. The part is put into power-down
mode over the serial interface.
The low power consumption of this part in normal operation
makes it ideally suited to portable battery operated equipment.
The power consumption is 0.7 mW at 5 V reducing to 1 µW in
power-down mode.
The AD5320 is one of a family of pin-compatible DACs. The
AD5300 is the 8-bit version and the AD5310 is the 10-bit
version. The AD5300/AD5310/AD5320 are available in 6-lead
SOT-23 packages and 8-lead µSOIC packages.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
*Patent pending; protected by U.S. Patent No. 5684481.
REV. B
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PRODUCT HIGHLIGHTS
1. Available in 6-lead SOT-23 and 8-lead µSOIC packages.
2. Low power, single supply operation. This part operates from
a single +2.7 V to +5.5 V supply and typically consumes
0.35 mW at 3 V and 0.7 mW at 5 V, making it ideal for
battery powered applications.
3. The on-chip output buffer amplifier allows the output of the
DAC to swing rail-to-rail with a slew rate of 1 V/µs.
4. Reference derived from the power supply.
5. High speed serial interface with clock speeds up to 30 MHz.
Designed for very low power consumption. The interface
only powers up during a write cycle.
6. Power-down capability. When powered down, the DAC
typically consumes 50 nA at 3 V and 200 nA at 5 V.
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© Analog Devices, Inc., 2000