digital-to-analog converter. AD5821 Datasheet

AD5821 converter. Datasheet pdf. Equivalent

AD5821 Datasheet
Recommendation AD5821 Datasheet
Part AD5821
Description single 10-bit digital-to-analog converter
Feature AD5821; www.DataSheet4U.com 120 mA, Current Sinking, 10-Bit, I2C® DAC AD5821 FEATURES 120 mA current sink A.
Manufacture Analog Devices
Datasheet
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Analog Devices AD5821
www.DataSheet4U.com
FEATURES
120 mA current sink
Available in 3 × 3 array WLCSP package
2-wire (I2C-compatible) 1.8 V serial interface
10-bit resolution
Integrated current sense resistor
2.7 V to 5.5 V power supply
Guaranteed monotonic over all codes
Power-down to 0.5 μA typical
Internal reference
Ultralow noise preamplifier
Power-down function
Power-on reset
CONSUMER APPLICATIONS
Lens autofocus
Image stabilization
Optical zoom
Shutters
Iris/exposure
Neutral density (ND) filters
Lens covers
Camera phones
Digital still cameras
Camera modules
Digital video cameras/camcorders
Camera-enabled devices
Security cameras
Web/PC cameras
120 mA, Current Sinking,
10-Bit, I2C® DAC
AD5821
INDUSTRIAL APPLICATIONS
Heater controls
Fan controls
Cooler (Peltier) controls
Solenoid controls
Valve controls
Linear actuator controls
Light controls
Current loop controls
GENERAL DESCRIPTION
The AD5821 is a single 10-bit digital-to-analog converter with
120 mA output current sink capability. It features an internal
reference and operates from a single 2.7 V to 5.5 V supply.
The DAC is controlled via a 2-wire (I2C-compatible) serial
interface that operates at clock rates up to 400 kHz.
The AD5821 incorporates a power-on reset circuit that ensures
that the DAC output powers up to 0 V and remains there until
a valid write takes place. It has a power-down feature that reduces
the current consumption of the device to 1 μA maximum.
The AD5821 is designed for autofocus, image stabilization, and
optical zoom applications in camera phones, digital still cameras,
and camcorders.
The AD5821 also has many industrial applications, such as
controlling temperature, light, and movement, over the range of
−40°C to +85°C without derating.
The I2C address for the AD5821 is 0x18.
FUNCTIONAL BLOCK DIAGRAM
XSHUTDOWN
VDD
DGND
SDA
SCL
REFERENCE
POWER-ON
RESET
I2C SERIAL
INTERFACE
10-BIT
CURRENT
OUTPUT DAC
VDD
D1
ISINK
AD5821
R
DGND
Figure 1.
RSENSE
3.3
AGND
Rev. 0
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.
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
©2007 Analog Devices, Inc. All rights reserved.



Analog Devices AD5821
www.DataSheet4U.com
AD5821
TABLE OF CONTENTS
Features .............................................................................................. 1
Consumer Applications ................................................................... 1
Industrial Applications .................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AC Specifications.......................................................................... 4
Timing Specifications .................................................................. 4
Absolute Maximum Ratings............................................................ 5
Pin Configuration and Function Descriptions............................. 6
REVISION HISTORY
1/07—Revision 0: Initial Version
Typical Performance Characteristics ..............................................7
Terminology .................................................................................... 10
Theory of Operation ...................................................................... 11
Serial Interface ............................................................................ 11
I2C Bus Operation ...................................................................... 11
Data Format ................................................................................ 11
Power Supply Bypassing and Grounding................................ 12
Applications Information .............................................................. 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Rev. 0 | Page 2 of 16



Analog Devices AD5821
www.DataSheet4U.com
AD5821
SPECIFICATIONS
VDD = 2.7 V to 5.5 V, AGND = DGND = 0 V, load resistance RL = 25 Ω connected to VDD; all specifications TMIN to TMAX,
unless otherwise noted.
Table 1.
Parameter
DC PERFORMANCE
Resolution
Relative Accuracy2
Differential Nonlinearity2, 3
Zero-Code Error2, 4
Offset Error @ Code 162
Gain Error2
Offset Error Drift4, 5
Gain Error Drift2, 5
B Version1
Min Typ Max
10
±1.5 ±4
±1
0 15
0.5
±0.6
10
±0.2 ±0.5
Unit
Bits
LSB
LSB
mA
mA
% of FSR
μA/°C
LSB/°C
Test Conditions/Comments
VDD = 3.6 V to 4.5 V; device operates over 2.7 V to 5.5 V
with reduced performance
117 μA/LSB
Guaranteed monotonic over all codes
All 0s loaded to DAC
@ 25°C
OUTPUT CHARACTERISTICS
Minimum Sink Current4
3 mA
Maximum Sink Current
120 mA
Output Current During XSHUTDOWN
80
nA XSHUTDOWN = 0
Output Compliance5
0.6
VDD V
Output voltage range over which maximum 120 mA
sink current is available
Output Compliance5
0.48
VDD V
Output voltage range over which 90 mA sink current
is available
Power-Up Time
20 μs To 10% of FS, coming out of power-down mode; VDD = 5 V
LOGIC INPUTS (XSHUTDOWN)5
Input Current
±1 μA
Input Low Voltage, VINL
0.54 V
VDD = 2.7 V to 5.5 V
Input High Voltage, VINH
1.3
V VDD = 2.7 V to 5.5 V
Pin Capacitance
3 pF
LOGIC INPUTS (SCL, SDA)5
Input Low Voltage, VINL
−0.3
+0.54 V
VDD = 2.7 V to 3.6 V
Input High Voltage, VINH
1.26
VDD + 0.3 V
VDD = 2.7 V to 3.6 V
Input Low Voltage, VINL
−0.3
+0.54 V
VDD = 3.6 V to 5.5 V
Input High Voltage, VINH
1.4
VDD + 0.3 V
VDD = 3.6 V to 5.5 V
Input Leakage Current, IIN
±1 μA VIN = 0 V to VDD
Input Hysteresis, VHYST
0.05 VDD
V
Digital Input Capacitance, CIN
Glitch Rejection6
6 pF
50 ns Pulse width of spike suppressed
POWER REQUIREMENTS
VDD 2.7 5.5 V
IDD (Normal Mode)
IDD specification is valid for all DAC codes
VDD = 2.7 V to 3.6 V
IDD (Power-Down Mode)7
2.5 4
0.5
mA VINH = 1.8 V, VINL = GND, VDD = 3.6 V
μA VINH = 1.8 V, VINL = GND
1 Temperature range is as follows: B Version = −30°C to +85°C.
2 See the Terminology section.
3 Linearity is tested using a reduced code range: Code 32 to Code 1023.
4 To achieve near zero output current, use the power-down feature.
5 Guaranteed by design and characterization; not production tested. XSHUTDOWN is active low. SDA and SCL pull-up resistors are tied to 1.8 V.
6 Input filtering on both the SCL and the SDA inputs suppresses noise spikes that are less than 50 ns.
7 XSHUTDOWN is active low.
Rev. 0 | Page 3 of 16







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