Preliminary Technical Data
FEATURES
3 V/5 V, 12/14-Bit
nanoDAC
TM
D/A with
10 ppm/°C Max On-Chip Reference in SOT-23
AD5620/AD5640
FUNCTIONAL BLOCK DIAGRAM
V
REFOUT
GND
V
DD
1.25/2.5V
REF
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 AD5620/40 parts are a member of the
nanoDAC
family of
devices. They are low power, single, 12-/14-bit buffered voltage-
out DACs, guaranteed monotonic by design. The AD5620/40x-1
operate from a 3 V single supply featuring an internal reference
of 1.25 V and an internal gain of 2. The AD5620/40x-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, which ensures
that the DAC output powers up to 0 V (AD5620/40x-1/2) or to
midscale (AD5620/40x-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 AD5620/40 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. Its on-chip precision output amplifier allows rail-to-
rail output swing to be achieved.
Rev. PrA
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 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 µW in
power-down mode.
The AD5620/40 is designed with new technology and is the
next generation to the AD53xx family.
RELATED DEVICES
Part No.
AD5660
AD5662
Description
3 V/5 V 16-bit DAC in SOT-23, internal reference
2.7 V to 5.5 V 16-bit DAC in SOT-23, external reference
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
6.
16-bit DAC; 12-bit accuracy guaranteed.
On-chip 1.25 V/2.5 V, 10 ppm/°C max reference.
Available in 8-lead SOT-23 and 8-lead MSOP packages.
Power-on reset to 0 V or midscale.
Power-down capability. When powered down, the DAC
typically consumes 50 nA at 3 V and 200 nA at 5 V.
10 µS settling time.
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
© 2004 Analog Devices, Inc. All rights reserved.
04781-0-001
AD5620: low power single 12-bit
nanoDAC
AD5640: low power single 16-bit
nanoDAC
12-bit accuracy guaranteed
On-chip 1.25 V/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
3 power-down functions
Serial interface with Schmitt-triggered inputs
Rail-to-rail operation
SYNC interrupt facility
POWER-ON
RESET
AD5620/AD5640
V
FB
DAC
REGISTER
REF(+)
DAC
OUTPUT
BUFFER
V
OUT
INPUT
CONTROL
LOGIC
POWER-DOWN
CONTROL LOGIC
RESISTOR
NETWORK
AD5620/AD5640
TABLE OF CONTENTS
AD5620/40x-2/3–Specifications..................................................... 3
AD5620/40x-1–Specifications ........................................................ 5
Timing Characteristics..................................................................... 7
Pin Configuration and Function Descriptions............................. 8
Absolute Maximum Ratings............................................................ 9
ESD Caution.................................................................................. 9
Terminology .................................................................................... 10
Preliminary Technical Data
Typical Performance Characteristics ........................................... 11
Theory of Operation ...................................................................... 14
Serial Interface ............................................................................ 14
Microprocessor Interfacing....................................................... 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 17
REVISION HISTORY
10/04—Revision 0: PrA
Rev. PrA | Page 2 of 20
Preliminary Technical Data
AD5620/40X-2/3–SPECIFICATIONS
AD5620/AD5640
V
DD
= +4.5 V to +5.5 V; R
L
= 2 kΩ to GND; C
L
= 200 pF to GND; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 1.
Parameter
STATIC PERFORMANCE
2
AD5620
Resolution
Relative Accuracy
Differential Nonlinearity
AD5640
Resolution
Relative Accuracy
Differential Nonlinearity
Zero Code Error
Offset Error
Full-Scale Error
Gain Error
Zero Code Error Drift
3
Gain Temperature Coefficient
DC Power Supply Rejection Ratio
OUTPUT CHARACTERISTICS
3
Output Voltage Range
Output Voltage Settling Time
A Grade
B Grade
C Grade
Unit
B Version
1
Conditions/Comments
12
±6
±1
14
±8
±1
+5
+20
±10
−0.15
−1.25
±1.25
±2
±2.5
−100
0
V
DD
8
10
12
1
2
10
80
10
−80
5
0.1
0.5
30
4
12
±1
±1
14
±4
±1
+5
+20
±10
−0.15
−1.25
±1.25
±2
±2.5
−100
0
V
DD
8
10
12
1
2
10
80
10
−80
5
0.1
0.5
30
4
12
±1
±1
14
±4
±1
+5
+20
±10
−0.15
−1.25
±1.25
±2
±2.5
−100
Bits min
LSB max
LSB max
Bits min
LSB max
LSB max
mV typ
mV max
mV typ
% of FSR typ
% of FSR max
% of FSR max
µV/°C typ
ppm typ
dB typ
V min
V max
µs typ
µs max
µs typ
V/µs typ
nF typ
nF typ
nV/√Hz typ
µVp-p typ
dB typ
ppm/°C typ
nV-s typ
nV-s typ
Ω typ
mA typ
µs
typ
See Figure 4.
Guaranteed monotonic by design. See Figure 5.
See Figure 4.
Guaranteed monotonic by design. See Figure 5.
All 0s loaded to DAC register.
All 1s loaded to DAC register.
Of FSR/°C
DAC code = midscale; V
DD
= 5 V ±10%
Slew Rate
Capacitive Load Stability
Output Noise Spectral Density
Output Noise (0.1 Hz to 10 Hz)
THD, Total Harmonic Distortion
Output Drift
Digital-to-Analog Glitch Impulse
Digital Feedthrough
DC Output Impedance
Short Circuit Current
Power-Up Time
REFERENCE OUTPUT
Output Voltage
AD5620/40x-2/3
Reference TC
LOGIC INPUTS
3
Input Current
1
2
V
DD
8
10
12
1
2
10
80
10
−80
5
0.1
0.5
30
4
To ±0.003% FSR 0x0200 to 0xFD00
R
L
= 2 kΩ; 0 pF < C
L
< 200 pF
R
L
= 2 kΩ; C
L
= 500 pF
R
L
= ∞
R
L
= 2 kΩ
DAC code = midscale, 10kHz
DAC code = midscale
V
REF
= 2 V ± 300 mV p-p, f = 5 kHz
1 LSB change around major carry.
V
DD
= 5 V
Coming out of power-down mode. V
DD
= 5 V
2.495
2.505
±25
±1
2.495
2.505
±25
±1
2.495
2.505
±10
±1
V min
V max
ppm/°C max
µA max
Temperature ranges are as follows: B Version: -40°C to +105°C, typical at 25°C.
Linearity calculated using a reduced code range of 512 to 65024. Output unloaded.
3
Guaranteed by design and characterization, not production tested.
Rev. PrA | Page 3 of 20
AD5620/AD5640
Parameter
V
INL
, Input Low Voltage
V
INH
, Input High Voltage
Pin Capacitance
POWER REQUIREMENTS
V
DD
I
DD
(Normal Mode)
V
DD
= 4.5 V to 5.5 V
V
DD
= 4.5 V to 5.5 V
I
DD
(All Power-Down Modes)
V
DD
= 4.5 V to 5.5 V
V
DD
= 4.5 V to 5.5 V
POWER EFFICIENCY
I
OUT
/I
DD
A Grade
0.8
2
3
4.5
5.5
0.5
1
0.2
1
89
B Grade
0.8
2
3
4.5
5.5
0.5
1
0.2
1
89
C Grade
0.8
2
3
4.5
5.5
0.5
1
0.2
1
89
Unit
V max
V min
pF max
V min
V max
mA typ
mA max
µA typ
µA max
%
Preliminary Technical Data
B Version
1
Conditions/Comments
V
DD
= 5 V
V
DD
= 5 V
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
Rev. PrA | Page 4 of 20
Preliminary Technical Data
AD5620/40X-1–SPECIFICATIONS
AD5620/AD5640
V
DD
= 2.7 V to 3.6 V; R
L
= 2 kΩ to GND; C
L
= 200 pF to GND; all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter
STATIC PERFORMANCE
5
AD5620
Resolution
Relative Accuracy
Differential Nonlinearity
AD5640
Resolution
Relative Accuracy
Differential Nonlinearity
Zero Code Error
Offset Error
Full-Scale Error
Gain Error
Zero Code Error Drift
6
Gain Temperature Coefficient
DC Power Supply Rejection Ratio
OUTPUT CHARACTERISTICS
3
Output Voltage Range
Output Voltage Settling Time
A Grade
B Grade
C Grade
Unit
B Version
4
Conditions/Comments
12
±6
±1
14
±8
±1
+5
+20
±10
−0.15
−1.25
±1.25
±20
±5
−100
0
V
DD
8
10
12
1
2
10
80
10
−80
5
0.1
0.5
30
10
12
±1
±1
14
±4
±1
+5
+20
±10
−0.15
−1.25
±1.25
±20
±5
−100
0
V
DD
8
10
12
1
2
10
80
10
−80
tbd
5
0.1
0.5
30
10
12
±1
±1
14
±4
±1
+5
+20
±10
−0.15
−1.25
±1.25
±20
±5
−100
Bits min
LSB max
LSB max
Bits min
LSB max
LSB max
mV typ
mV max
mV typ
% of FSR typ
% of FSR max
% of FSR max
µV/°C typ
ppm typ
dB typ
V min
V max
µs typ
µs max
µs typ
V/µs typ
nF typ
nF typ
nV/√Hz typ
µVp-p typ
dB typ
ppm/°C typ
nV-s typ
nV-s typ
Ω
typ
mA typ
µs
typ
See Figure 4.
Guaranteed monotonic by design. See Figure 5.
See Figure 4.
Guaranteed monotonic by design. See Figure 5.
All 0s loaded to DAC register
All 1s loaded to DAC register.
Of FSR/°C
DAC code = midscale; V
DD
= 3 V ±10%
Slew Rate
Capacitive Load Stability
Output Noise Spectral Density
Output Noise (0.1 Hz to 10 Hz)
THD, Total Harmonic Distortion
Output Drift
Digital-to-Analog Glitch Impulse
Digital Feedthrough
DC Output Impedance
Short Circuit Current
Power-Up Time
REFERENCE OUTPUT
Output Voltage
AD5620/40x-1
Reference TC
V
DD
8
10
12
1
2
10
80
10
−80
5
0.1
0.5
30
10
To ±0.003% FSR 0200
H
to FD00
H
R
L
= 2 kΩ; 0 pF < C
L
< 200 pF.
R
L
= 2 kΩ; C
L
= 500 pF
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
= 3 V
Coming out of power-down mode. V
DD
= 3 V
1.248
1.252
±25
1.248
1.252
±25
1.248
1.252
±10
V min
V max
ppm/°C max
4
5
Temperature ranges are as follows: B Version: -40°C to +105°C, typical at 25°C.
Linearity calculated using a reduced code range of 485 to 64714. Output unloaded.
6
Guaranteed by design and characterization, not production tested.
Rev. PrA | Page 5 of 20
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