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2.7 V to 5.5 V, 250 μA, Rail-to-Rail Output
16-Bit
nanoDAC
TM
in a SOT-23
AD5662
FEATURES
Low power (250 μA @ 5 V) single 16-bit
nanoDAC
12-bit accuracy guaranteed
Tiny 8-lead SOT-23/MSOP package
Power-down to 480 nA @ 5 V, 100 nA @ 3 V
Power-on reset to zero scale/midscale
2.7 V to 5.5 V power supply
Guaranteed 16-bit monotonic by design
3 power-down functions
Serial interface with Schmitt-triggered inputs
Rail-to-rail operation
SYNC interrupt facility
Temperature range −40°C to +125°C
Qualified for automotive applications
FUNCTIONAL BLOCK DIAGRAM
V
REF
GND
V
DD
POWER-ON
RESET
AD5662
V
FB
REF(+)
16-BIT
DAC
DAC
REGISTER
OUTPUT
BUFFER
V
OUT
INPUT
CONTROL
LOGIC
POWER-DOWN
CONTROL LOGIC
RESISTOR
NETWORK
04777-001
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
SYNC
SCLK
DIN
Figure 1.
GENERAL DESCRIPTION
The AD5662, a member of the
nanoDAC
family, is a low power,
single, 16-bit buffered voltage-out DAC that operates from a
single 2.7 V to 5.5 V supply and is guaranteed monotonic by
design.
The AD5662 requires an external reference voltage to set the
output range of the DAC. The part incorporates a power-on
reset circuit that ensures the DAC output powers up to 0 V
(AD5662x-1) or to midscale (AD5662x-2), and remains there
until a valid write takes place. The part contains a power-down
feature that reduces the current consumption of the device to
480 nA at 5 V and provides software-selectable output loads
while in power-down mode.
The low power consumption of this part in normal operation
makes it ideally suited to portable battery-operated equipment.
The power consumption is 0.75 mW at 5 V, going down to
2.4 μW in power-down mode.
The AD5662’s on-chip precision output amplifier allows rail-to-
rail output swing to be achieved. For remote sensing applications,
the output amplifier’s inverting input is available to the user.
Rev. A
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.
The AD5662 uses 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.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
16-bit DAC—12-bit accuracy guaranteed.
Available in 8-lead SOT-23 and 8-lead MSOP packages.
Low power. Typically consumes 0.42 mW at 3 V and
0.75 mW at 5 V.
Power-on reset to zero scale or to midscale.
10 μs max settling time.
RELATED DEVICES
Part No.
AD5620/AD5640/AD5660
Description
3 V/5 V 12-/14-/16-bit DAC with
internal reference in SOT-23
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
©2005–2010 Analog Devices, Inc. All rights reserved.
AD5662
TABLE OF CONTENTS
Specifications..................................................................................... 3
Timing Characteristics..................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Description .............................. 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
DAC Section................................................................................ 14
Resistor String............................................................................. 14
Output Amplifier........................................................................ 14
Serial Interface ............................................................................ 14
Input Shift Register .................................................................... 15
SYNC Interrupt .......................................................................... 15
Power-On Reset.......................................................................... 15
Power-Down Modes .................................................................. 16
Microprocessor Interfacing ...................................................... 16
Applications..................................................................................... 18
Choosing a Reference for the AD5662.................................... 18
Using a Reference as a Power Supply for the AD5662 .......... 18
Bipolar Operation Using the AD5662..................................... 19
Using the AD5662 as an Isolated, Programmable, 4-20 mA
Process Controller...................................................................... 19
Using AD5662 with a Galvanically Isolated Interface........... 20
Power Supply Bypassing and Grounding................................ 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 22
Automotive Products................................................................. 22
REVISION HISTORY
12/10—Rev. 0 to Rev. A
Changes to Features Section.............................................................1
Changes to Ordering Guide ...........................................................22
Added Automotive Products Section ...........................................22
1/05—Revision 0: Initial Version
Rev. A | Page 2 of 24
AD5662
SPECIFICATIONS
V
DD
= 2.7 V to 5.5 V; R
L
= 2 kΩ to GND; C
L
= 200 pF to GND; V
REF
= V
DD
; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
STATIC PERFORMANCE
2
Resolution
Relative Accuracy
Differential Nonlinearity
Zero Code Error
Full-Scale Error
Offset Error
Gain Error
Zero Code Error Drift
3
Gain Temperature Coefficient
3
DC Power Supply Rejection Ratio
3
OUTPUT CHARACTERISTICS
3
Output Voltage Range
Output Voltage Settling Time
Slew Rate
Capacitive Load Stability
Output Noise Spectral Density
4
Output Noise (0.1 Hz to 10 Hz)
4
Total Harmonic Distortion (THD)
4
Digital-to-Analog Glitch Impulse
Digital Feedthrough
DC Output Impedance
Short-Circuit Current
4
Power-Up Time
REFERENCE INPUT
3
Reference Current
Reference Input Range
5
Reference Input Impedance
LOGIC INPUTS
3
Input Current
V
INL
, Input Low Voltage
V
INH
, Input High Voltage
Pin Capacitance
0.75
125
±2
0.8
2
3
2
3
A Grade
Min Typ
Max
16
±8
±32
±1
10
−1
±10
±1.5
B Grade
Min Typ
Max
16
±8
±16
±1
10
−1
±10
±1.5
Unit
Bits
LSB
LSB
mV
% FSR
mV
% FSR
μV/°C
ppm
dB
V
μs
V/μs
nF
nF
nV/√Hz
μV p-p
dB
nV-s
nV-s
Ω
mA
μs
Y Version
1
Conditions/Comments
2
−0.2
2
−0.2
See Figure 4
Guaranteed monotonic by design
See Figure 5
All 0s loaded to DAC register
All 1s loaded to DAC register
±2
±2.5
−100
0
8
1.5
2
10
100
10
−80
5
0.1
0.5
30
4
V
DD
10
0
±2
±2.5
−100
V
DD
10
Of FSR/°C
DAC code = midscale; V
DD
= 5 V/3 V ±10%
8
1.5
2
10
100
10
−80
5
0.1
0.5
30
4
¼ to ¾ scale change settling to ±2 LSB
R
L
= 2 kΩ; 0 pF < C
L
< 200 pF
¼ to ¾ scale
R
L
= ∞
R
L
= 2 kΩ
DAC code = midscale,10 kHz
DAC code = midscale
V
REF
= 2 V ± 300 mV p-p, f = 5 kHz
1 LSB change around major carry
V
DD
= 5 V, 3 V
Coming out of power-down mode
V
DD
= 5 V, 3 V
V
REF
= V
DD
= 5 V
V
REF
= V
DD
= 3.6 V
40
30
75
50
V
DD
40
30
0.75
125
75
50
V
DD
μA
μA
V
kΩ
μA
V
V
pF
±2
0.8
All digital inputs
V
DD
= 5 V, 3 V
V
DD
= 5 V, 3 V
Rev. A | Page 3 of 24
AD5662
Parameter
POWER REQUIREMENTS
V
DD
I
DD
(Normal Mode)
V
DD
= 4.5 V to 5.5 V
V
DD
= 2.7 V to 3.6 V
I
DD
(All Power-Down Modes)
V
DD
= 4.5 V to 5.5 V
V
DD
= 2.7 V to 3.6 V
POWER EFFICIENCY
I
OUT
/I
DD
1
2
A Grade
Min Typ
Max
2.7
150
140
0.48
0.1
90
5.5
250
225
1
0.375
B Grade
Min Typ
Max
2.7
150
140
0.48
0.1
90
5.5
250
225
1
0.375
Unit
V
μA
μA
μA
μA
%
Y Version
1
Conditions/Comments
All digital inputs at 0 V or V
DD
DAC active and excluding load current
V
IH
= V
DD
and V
IL
= GND
V
IH
= V
DD
and V
IL
= GND
V
IH
= V
DD
and V
IL
= GND
V
IH
= V
DD
and V
IL
= GND
I
LOAD
= 2 mA. V
DD
= 5 V
Temperature range is as follows: Y version: −40°C to +125°C, typical at +25°C.
DC specifications tested with the outputs unloaded, unless otherwise stated. Linearity calculated using a reduced code range of 512 to 65024.
3
Guaranteed by design and characterization; not production tested.
4
Output unloaded.
5
Reference input range at ambient where ±1 LSB max DNL specification is achievable.
Rev. A | Page 4 of 24
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