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參數(shù)資料
| 型號： | AD5312 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual Rail-To-Rail,Voltage Output 10-Bit DACs(滿幅度電壓輸出雙10位D/A轉換器) |
| 中文描述： | 雙通道軌至軌電壓輸出10位DAC（滿幅度電壓輸出雙10位的D / A轉換器） |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 310K |
| 代理商： | AD5312 |
pins (one per DAC). These reference inputs may be configured
as buffered or unbuffered inputs depending on the state of the
BUF bit. The parts incorporate a power-on-reset circuit that en-
sures that the DAC outputs power up to zero volts and remain
there until a valid write takes place to the device. The outputs of
both DACs may be updated simultaneously using the asynchro-
nous
LDAC
input. The parts contain a power-down feature
which reduces the current consumption of the devices to 200nA
at 5V (50nA at 3V) and provides software-selectable output loads
while in power-down mode. Both DACs may be powered down
individually. The parts are put into power-down mode over the
serial interface.
a
Prelim Technical Information
AD5302/12/22
FEATURES
AD5302: Two 8-Bit DACs in One Package
AD5312: Two 10-Bit DACs in One Package
AD5322: Two 12-Bit DACs in One Package
10-Pin microSOIC Package
Micro-Power Operation: 250
μ
A @ 5V (Including
Reference Current)
Power Down to 200nA@5V, 50nA@3V
+2.5V to +5.5V Power Supply
Double-Buffered Input Logic
Guaranteed Monotonic By Design
Buffered/Unbuffered Reference Input Options
Power-On-Reset to Zero Volts
Simultaneous Update of DAC Outputs
Low-Power Serial Interface with Schmitt-Triggered
Inputs
On-Chip Output Buffer Amplifiers with Rail-to-Rail
Operation
SYNC
Interrupt Facility
APPLICATIONS
Portable Battery Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
GENERAL DESCRIPTION
The AD5302/12/22 are dual 8, 10 and 12-bit voltage out DACs
which operate from a single +2.5V to +5.5V supply. Their on-
chip precision output amplifiers allow rail-to-rail output swing to
be achieved. The AD5302/12/22 utilize a versatile 3-wire serial
interface which operates at clock rates up to 30MHz and is com-
patible with standard SPI, QSPI, MICROWIRE and DSP
interface standards.
The references for the two DACs are derived from two reference
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.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
The four control bits in the 16-bit serial input word are used to
address the relevant DAC, to select the reference option and to
select the mode of operation (normal or any one of three power-
down modes).
The low power consumption of these parts in normal operation
make them ideally suited to portable battery-operated equip-
ment. The power consumption is 1.25mW at 5V reducing to
1μW in power-down mode.
The AD5302/12/22 are all available in a 10-pin
μ
SOIC package.
PRODUCT HIGHLIGHTS
1. Low Power, Single supply operation. These parts operate
from a single +2.5V to +5.5V supply and consume 0.6 mW at
3V and 1.25 mW at 5V making them ideal for battery pow-
ered applications. Since the references may be buffered inter-
nally no external reference current is required and system
power consumption is reduced.
2. The on-chip output buffer amplifiers allow the outputs of the
DACs to swing rail-to-rail with a slew rate of 1V/μs.
3. Reference pins may be configured as buffered or
unbuffered.The unbuffered option allows the reference input
to be as high as V
DD
.
4. High speed serial interface with clock speeds up to 30MHz.
Designed for very low power consumption. The interface only
powers up during a write cycle.
5. Power down capability. When powered down the DACs con-
sume 50nA at 3V and 200nA at 5V.
6. Output range of 0-V
REF
.
7. Packaged in a 10-pin
μ
SOIC package.
Prelim.D1 7/98
+2.5 V to +5.5 V, Dual Rail-To-Rail,
Voltage Output 8/10/12-Bit DACs
FUNCTIONAL BLOCK DIAGRAM
SPI
,
QSPI
are Trademarks of Motorola.
MICROWIRE
is a Trademark of National Semiconductor.
DAC
LATCH
DAC A
INPUT
LATCH
CONTROL
LOGIC
AD5302/12/22
VOUT A
VOUT B
DAC
LATCH
DAC B
INPUT
LATCH
GND
VDD
SYNC
CLK
SDIN
POW ER-ON
RESET
LDAC
VREF B
VREF A
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