AD5660 3 V/5 V, 16-Bit nanoDACTM D/A with 10 ppm/C Max On-Chip Reference in SOT-23 Preliminary Data Sheet (REV. PrJ)
3 V/5 V, 16-Bit nanoDAC
TM
D/A with
10 ppm/C Max On-Chip Reference in SOT-23
Preliminary Technical Data
AD5660
Rev. Pr J
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2004 Analog Devices, Inc. All rights reserved.
FEATURES
Low power single 16-bit nanoDAC
12-bit accuracy guaranteed
On-chip 1.25/2.5 V, 10 ppm/c reference
Tiny 8-lead SOT-23/MSOP package
Power-down to 200 nA @ 5 V, 50 nA @ 3 V
3 V/5 V single power supply
Guaranteed 16-bit monotonic by design
Power-on-reset to zero/midscale
Three power-down functions
Serial interface with Schmitt-triggered inputs
Rail-to-rail operation
SYNC interrupt facility
APPLICATIONS
Processcontrol
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
Figure 1.
GENERAL DESCRIPTION
The AD5660 parts are a member of the nanoDAC family of
devices. They are low power, single, 16-bit buffered voltage-out
DACs, guaranteed monotonic by design.
The AD5660x-1 operate from a 3 V single supply featuring an
internal reference of 1.25 V and an internal gain of 2. The
AD5660x-2/3 operate from a 5 V single supply featuring an
internal reference of 2.5 V and an internal gain of 2. Each
reference has a 10 ppm/C max temperature coefficient. The
reference associated with each part is available at the REFOUT
pin.
The part incorporates a power-on reset circuit that ensures that
the DAC output powers up to 0 V (AD5660x-1/2) or midscale
(AD5660x-3) 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 200 nA at 5 V and provides
software selectable output loads while in power-down mode.
The AD5660 uses a versatile three-wire serial interface that
operates at clock rates up to 30 MHz and is compatible with
standard SPITM, QSPITM, MICROWIRETM and DSP interface
standards. Its on-chip precision output amplifier allows rail-to-
rail output swing to be achieved.
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 W in
power-down mode.
The AD5660 is designed with new technology and is the next
generation to the AD53xx family.
PRODUCT HIGHLIGHTS
1.
16-Bit DAC; 12-Bit Accuracy Guaranteed.
2.
On-chip 1.25/2.5 V, 10 ppm/C max Reference.
3.
Available in 8-lead SOT-23 and 8-lead MSOP package.
4.
Power-On Reset to 0 V or Midscale.
5.
Power-down capability. When powered down, the DAC
typically consumes 50 nA at 3 V and 200n A at 5 V.
6.
10 S Settling Time.
RELATED DEVICES
Part No.
Description
AD5620/AD5640
3 V/5 V 12-/14-bit DAC with internal ref in
SOT-23
AD5662
2.7V to 5.5 V, 16-bit DAC in SOT-23,
external reference
AD5660
Preliminary Technical Data
Rev. PrJ Page 2 of 20
TABLE OF CONTENTS
AD5660X-2/3Specifications ......................................................... 3
AD5660x-1Specifications.............................................................. 5
Timing Characteristics..................................................................... 7
Pin Configuration and Function Descriptions............................. 8
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Terminology .................................................................................... 10
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 14
D/A Section................................................................................. 14
Resistor String ............................................................................. 14
Output Amplifier ........................................................................ 14
Serial Interface ............................................................................ 14
SYNC Interrupt .......................................................................... 15
Power-On Reset.......................................................................... 15
Power-Down Modes .................................................................. 15
Microprocessor Interfacing....................................................... 15
Applications..................................................................................... 17
Using REF19x as a Power Supply for AD5660 ....................... 17
Bipolar Operation Using the AD5660 ..................................... 17
Using AD5660 with an Opto-Isolated Interface..................... 17
Power Supply Bypassing and Grounding................................ 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 19
REVISION HISTORY
Revision PrJ: Preliminary
Preliminary Technical Data
AD5660
Rev. PrJ | Page 3 of 20
AD5660X-2/3SPECIFICATIONS
V
DD
= 4.5 V to 5.5 V; R
L
= 2 k to GND; C
L
= 200 pF to GND; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
A Grade
B Grade
C Grade
Unit
B Version
1
Conditions/Comments
STATIC PERFORMANCE
2
Resolution
16
16
16
Bits min
Relative Accuracy
32
16
16
LSB max
See Figure 4
Differential Nonlinearity
1
1
1
LSB max
Guaranteed Monotonic by Design. See Figure 5.
Zero Code Error
+5
+5
+5
mV typ
All Zeroes Loaded to DAC
+20
+20
+20
mV max
Register. See Figure 8.
Full-Scale Error
-0.15
-0.15
-0.15
% of FSR typ
All Ones Loaded to DAC
-1.25
-1.25
-1.25
% of FSR max
Register. See Figure 8
Gain Error
1.25
1.25
1.25
% of FSR max
Zero Code Error Drift
3
20
20
20
V/C
typ
Gain Temperature Coefficient
5
5
5
ppm typ
f FSR/C
OUTPUT CHARACTERISTICS
3
Output Voltage Range
0
0
V min
V
DD
V
DD
V
DD
V
max
Output Voltage Settling Time
8
8
8
s typ
To 0.003% FSR 0200
H
to FD00
H
10
10
10
s
max
R
L
= 2 k; 0 pF <C
L
< 200 pF See Figure 18.
12
12
12
s
typ
R
L
= 2 k; C
L
= 500 pF
Slew Rate
1
1
1
V/s typ
Capacitive Load Stability
470
470
470
pF typ
R
L
=
1000
1000
1000
pF
typ
R
L
= 2 k
Output Noise
100
100
100
nV/Hz typ
DAC code = 8400
H
, 10 kHz
Output Drift
ppm/C typ
Digital-to-Analog Glitch Impulse
10
10
10
nV-s typ
1 LSB Change Around Major Carry. See Figure 21.
Digital Feedthrough
0.5
0.5
0.5
nV-s typ
DC Output Impedance
1
1
1
typ
Short Circuit Current
50
50
50
mA typ
V
DD
= 5 V
Power-Up Time
10
10
10
ms typ
Coming Out of Power-Down Mode. V
DD
= 5 V
REFERENCE OUTPUT
Output Voltage
AD5660x-2/3
2.495
2.495
2.495
V min
2.505
2.505
2.505
V
max
Reference TC
25
25
10
ppm/C max
LOGIC INPUTS
3
Input Current
1
1
1
A max
V
INL
, Input Low Voltage
0.8
0.8
0.8
V max
V
DD
= 5 V
V
INH
, Input High Voltage
2
2
2
V min
V
DD
= 5 V
Pin Capacitance
3
3
3
pF max
AD5660
Preliminary Technical Data
Rev. PrJ Page 4 of 20
Parameter
A Grade
B Grade
C Grade
Unit
B Version
1
Conditions/Comments
POWER REQUIREMENTS
V
DD
4.5
4.5
4.5
V min
All Digital Inputs at 0 V or V
DD
5.5
5.5
5.5
V max
DAC Active and Excluding
I
DD
(Normal Mode)
Load Current
V
DD
= 4.5 V to +5.5 V
0.5
0.5
0.5
mA typ
V
IH
= V
DD
and V
IL
= GND
V
DD
= 4.5 V to +5.5 V
1
1
1
mA max
V
IH
= V
DD
and V
IL
= GND
I
DD
(All Power-Down Modes)
V
DD
= 4.5 V to +5.5 V
0.2
0.2
0.2
A typ
V
IH
= V
DD
and V
IL
= GND
V
DD
= 4.5 V to +5.5 V
1
1
1
A max
V
IH
= V
DD
and V
IL
= GND
POWER EFFICIENCY
I
OUT
/I
DD
89
89
89
%
I
LOAD
= 2 mA, V
DD
= 5 V
1
Temperature ranges are as follows: B Version: -40C to +105C, typical at 25C.
2
Linearity calculated using a reduced code range of 485 to 64714. Output unloaded.
3
Guaranteed by design and characterization, not production tested.
Preliminary Technical Data
AD5660
Rev. PrJ | Page 5 of 20
AD5660X-1SPECIFICATIONS
V
DD
= 2.7 V to 3.6 V; R
L
= 2 k to GND; C
L
= 200 pF to GND; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter
A Grade
B Grade
C Grade
Unit
B Version
4
Conditions/Comments
STATIC PERFORMANCE
5
Resolution
16
16
16
Bits min
Relative Accuracy
32
16
16
LSB max
See Figure 4
Differential Nonlinearity
1
1
1
LSB max
Guaranteed Monotonic by Design. See Figure 5.
Zero Code Error
+5
+5
+5
mV typ
All Zeroes Loaded to DAC
+20
+20
+20
mV max
Register. See Figure 8.
Full-Scale Error
-0.15
-0.15
-0.15
% of FSR typ
All Ones Loaded to DAC
-1.25
-1.25
-1.25
% of FSR max
Register. See Figure 8.
Gain Error
1.25
1.25
1.25
% of FSR max
Zero Code Error Drift
6
20
20
20
V/C
typ
Gain Temperature Coefficient
5
5
5
ppm typ
of FSR/C
OUTPUT CHARACTERISTICS
3
Output Voltage Range
0
0
V min
V
DD
V
DD
V
DD
V
max
Output Voltage Settling Time
8
8
8
s typ
To 0.003% FSR 0200
H
to FD00
H
10
10
10
s
max
R
L
= 2 k; 0 pF<C
L
<200 pF See Figure 18.
12
12
12
s
typ
R
L
= 2 k; C
L
= 500 pF
Slew Rate
1
1
1
V/s typ
Capacitive Load Stability
470
470
470
pF typ
R
L
=
1000
1000
1000
pF
typ
R
L
= 2 k
Output Noise
100
100
100
nV/Hz typ
DAC code = 8400
H
, 10 kHz
Output Drift
tbd
ppm/C typ
Digital-to-Analog Glitch Impulse
10
10
10
nV-s typ
1 LSB Change Around Major Carry. See Figure 21.
Digital Feedthrough
0.5
0.5
0.5
nV-s typ
DC Output Impedance
1
1
1
typ
Short Circuit Current
20
20
20
mA typ
V
DD
= 3 V
Power-Up Time
10
10
10
ms typ
Coming Out of Power-Down Mode. V
DD
= 3 V
REFERENCE OUTPUT
Output Voltage
AD5660x-1
1.248
1.248
1.248
V min
1.252
1.252
1.252
V
max
Reference TC
25
25
10
ppm/C max
LOGIC INPUTS
3
Input Current
1
1
1
A max
V
INL
, Input Low Voltage
0.8
0.8
0.8
V max
V
DD
= 3 V
V
INH
, Input High Voltage
2
2
2
V min
V
DD
= 3 V
Pin Capacitance
3
3
3
pF max
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