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AD5641AKSZ-REEL7 Datenblatt(PDF) 1 Page - Analog Devices

Teilenummer AD5641AKSZ-REEL7
Bauteilbeschribung  SPI Interface in LFCSP and SC70
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

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2.7 V to 5.5 V, <100 µA, 14-Bit nanoDAC,
SPI Interface in LFCSP and SC70
Data Sheet
AD5641
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005–2012 Analog Devices, Inc. All rights reserved.
FEATURES
6-lead LFCSP and SC70 packages
Micropower operation: 100 µA maximum at 5 V
Power-down to typically 0.2 µA at 3 V
Single 14-bit DAC
B version: ±4 LSB INL
A version: ±16 LSB INL
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to 0 V with brownout detection
3 power-down functions
Low power serial interface with Schmitt-triggered inputs
On-chip output buffer amplifier, rail-to-rail operation
SYNC interrupt facility
APPLICATIONS
Voltage level setting
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
GENERAL DESCRIPTION
The AD5641, a member of the nanoDAC® family, is a single,
14-bit, buffered, voltage-out DAC that operates from a single
2.7 V to 5.5 V supply, typically consuming 75 µA at 5 V. The
part comes in tiny LFCSP and SC70 packages. Its on-chip
precision output amplifier allows rail-to-rail output swing to be
achieved. The AD5641 uses a versatile 3-wire serial interface
that operates at clock rates up to 30 MHz and is compatible with
SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The
reference for AD5641 is derived from the power supply inputs
and, therefore, gives the widest dynamic output range. The part
incorporates a power-on reset circuit, which ensures that the
DAC output powers up to 0 V and remains there until a valid
write to the device takes place.
The AD5641 contains a power-down feature that reduces
current consumption typically to 0.2 µA at 3 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 the part in normal operation
makes it ideally suited to portable battery-operated equipment.
The combination of small package and low power makes this
nanoDAC device ideal for level-setting requirements such as
generating bias or control voltages in space-constrained and
power-sensitive applications.
FUNCTIONAL BLOCK DIAGRAM
AD5641
VDD
VOUT
GND
POWER-ON
RESET
DAC
REGISTER
14-BIT
DAC
INPUT
CONTROL
LOGIC
POWER-DOWN
CONTROL LOGIC
OUTPUT
BUFFER
RESISTOR
NETWORK
REF(+)
SCLK SDIN
SYNC
Figure 1.
Table 1. Related Devices
Part Number
Description
AD5601
2.7 V to 5.5 V, <100 µA, 8-bit nanoDAC,
SPI interface in LFCSP and SC70 packages
AD5611
2.7 V to 5.5 V, <100 µA, 10-bit nanoDAC,
SPI interface in LFCSP and SC70 packages
AD5621
2.7 V to 5.5 V, <100 µA, 12-bit nanoDAC,
SPI interface in LFCSP and SC70 packages
PRODUCT HIGHLIGHTS
1. Available in space-saving 6-lead LFCSP and SC70
packages.
2. Low power, single-supply operation. The AD5641 operates
from a single 2.7 V to 5.5 V supply and with a maximum
current consumption of 100 µA, 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 typical slew rate of
0.5 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 powers up only during a write cycle.
6. Power-down capability. When powered down, the DAC
typically consumes 0.2 µA at 3 V.
7. Power-on reset with brownout detection.


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