AD AD5648ARUZ-2REEL7 Octal, 12-/14-/16-bit spi voltage output densedac with 5 ppm/â°c on-chip reference Datasheet

Octal, 12-/14-/16-Bit SPI Voltage Output
denseDAC with 5 ppm/°C On-Chip Reference
Data Sheet
AD5628/AD5648/AD5668
FEATURES
FUNCTIONAL BLOCK DIAGRAM
VREFIN/VREFOUT
VDD
AD5628/AD5648/AD5668
LDAC
INPUT
REGISTER
INPUT
REGISTER
INPUT
REGISTER
SCLK
SYNC
INTERFACE
LOGIC
INPUT
REGISTER
INPUT
REGISTER
DIN
INPUT
REGISTER
1.25V/2.5V
REF
DAC
REGISTER
DAC
REGISTER
DAC
REGISTER
DAC
REGISTER
DAC
REGISTER
DAC
REGISTER
STRING
DAC B
STRING
DAC C
STRING
DAC D
STRING
DAC E
STRING
DAC F
INPUT
REGISTER
DAC
REGISTER
STRING
DAC G
INPUT
REGISTER
DAC
REGISTER
STRING
DAC H
BUFFER
VOUTA
BUFFER
VOUTB
BUFFER
VOUTC
BUFFER
VOUTD
BUFFER
VOUTE
BUFFER
VOUTF
BUFFER
VOUTG
BUFFER
VOUTH
POWER-DOWN
LOGIC
POWER-ON
RESET
GND
LDAC1 CLR1
APPLICATIONS
STRING
DAC A
1RU-16 PACKAGE ONLY
05302-001
Low power, small footprint, pin-compatible octal DACs
AD5668: 16 bits
AD5648: 14 bits
AD5628: 12 bits
14-lead/16-lead TSSOP, 16-lead LFCSP, and 16-lead WLCSP
On-chip 1.25 V/2.5 V, 5 ppm/°C reference
Power down to 400 nA @ 5 V, 200 nA @ 3 V
2.7 V to 5.5 V power supply
Guaranteed monotonic by design
Power-on reset to zero scale or midscale
3 power-down functions
Hardware LDAC and LDAC override function
CLR function to programmable code
Rail-to-rail operation
Figure 1.
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
GENERAL DESCRIPTION
The AD5628/AD5648/AD5668 devices are low power, octal,
12-/14-/16-bit, buffered voltage-output DACs. All devices
operate from a single 2.7 V to 5.5 V supply and are guaranteed
monotonic by design. The AD5668 and AD5628 are available in
both a 4 mm × 4 mm LFCSP and a 16-lead TSSOP, while the
AD5648 is available in both a 14-lead and 16-lead TSSOP.
The AD5628/AD5648/AD5668 have an on-chip reference with
an internal gain of 2. The AD5628-1/AD5648-1/AD5668-1 have
a 1.25 V 5 ppm/°C reference, giving a full-scale output range
of 2.5 V; the AD5628-2/AD5648-2/AD5668-2 and AD5668-3 have
a 2.5 V 5 ppm/°C reference, giving a full-scale output range of
5 V. The on-board reference is off at power-up, allowing the use
of an external reference. The internal reference is enabled via a
software write.
The part incorporates a power-on reset circuit that ensures that the
DAC output powers up to 0 V (AD5628-1/AD5648-1/AD5668-1,
AD5628-2/AD5648-2/AD5668-2) or midscale (AD5668-3) and
remains powered up at this level until a valid write takes place.
The part contains a power-down feature that reduces the current
consumption of the device to 400 nA at 5 V and provides softwareRev. G
selectable output loads while in power-down mode for any or all
DAC channels. The outputs of all DACs can be updated simultaneously using the LDAC function, with the added functionality
of user-selectable DAC channels to simultaneously update. There
is also an asynchronous CLR that updates all DACs to a userprogrammable code—zero scale, midscale, or full scale.
The AD5628/AD5648/AD5668 utilize a versatile 3-wire serial
interface that operates at clock rates of up to 50 MHz and is
compatible with standard SPI®, QSPI™, MICROWIRE™, and
DSP interface standards. The on-chip precision output amplifier
enables rail-to-rail output swing.
PRODUCT HIGHLIGHTS
1.
2.
3.
4.
5.
Octal, 12-/14-/16-bit DAC.
On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
Available in 14-lead/16-lead TSSOP, 16-lead LFCSP, and
16-lead WLCSP.
Power-on reset to 0 V or midscale.
Power-down capability. When powered down, the DAC
typically consumes 200 nA at 3 V and 400 nA at 5 V.
Document Feedback
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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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2005–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
AD5628/AD5648/AD5668
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
D/A Section ................................................................................. 21
Applications ....................................................................................... 1
Resistor String ............................................................................. 21
Functional Block Diagram .............................................................. 1
Internal Reference ...................................................................... 21
General Description ......................................................................... 1
Output Amplifier ........................................................................ 22
Product Highlights ........................................................................... 1
Serial Interface ............................................................................ 22
Revision History ............................................................................... 2
Input Shift Register .................................................................... 23
Specifications..................................................................................... 3
SYNC Interrupt .......................................................................... 23
AC Characteristics ........................................................................ 6
Internal Reference Register ....................................................... 24
Timing Characteristics ................................................................ 7
Power-On Reset .......................................................................... 24
Absolute Maximum Ratings ............................................................ 8
Power-Down Modes .................................................................. 24
ESD Caution .................................................................................. 8
Clear Code Register ................................................................... 24
Pin Configurations and Function Descriptions ........................... 9
LDAC Function .......................................................................... 26
Typical Performance Characteristics ........................................... 11
Power Supply Bypassing and Grounding ................................ 26
Terminology .................................................................................... 19
Outline Dimensions ....................................................................... 27
Theory of Operation ...................................................................... 21
Ordering Guide .......................................................................... 29
REVISION HISTORY
1/13—Rev. F to Rev. G
Added WLCSP Reference TC of 15 ppm/°C, Table 2 .................. 5
Changes to Ordering Guide .......................................................... 29
8/11—Rev. E to Rev. F
Added 16-Lead WLCSP ..................................................... Universal
Added Figure 6 and Table 7; Renumbered Sequentially ........... 10
Changes to Figure 32 and Figure 33............................................. 15
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 28
1/11—Rev. D to Rev. E
Changes to AD5628 Relative Accuracy, Zero-Code Error, Offset
Error, and Reference TC Parameters, Table 1 ............................... 3
Changes to AD5628 Relative Accuracy, Zero-Code Error, Offset
Error, and Reference TC Parameters, Table 2 ............................... 5
Changes to Output Voltage Settling Time, Table 3 ...................... 6
Added Figure 53; Renumbered Sequentially .............................. 17
Change to Output Amplifier Section ........................................... 21
Changes to Ordering Guide .......................................................... 28
9/10—Rev. C to Rev. D
Change to Title .................................................................................. 1
Added 16-Lead LFCSP Throughout ................................ Universal
Changes to Table 1 ............................................................................ 3
Changes to Table 2.............................................................................5
Changes to Table 3.............................................................................6
Changes to Table 4.............................................................................7
Deleted SnPb from Table 5 ...............................................................8
Added Figure 5; Renumbered Sequentially ...................................9
Changes to Table 6.............................................................................9
Replaced Typical Performance Characteristics Section ............ 10
Changes to Power-On Reset Section ........................................... 23
Updated Outline Dimensions ....................................................... 26
Changes to Ordering Guide .......................................................... 28
1/10—Rev. B to Rev. C
Changes to Figure 3 ........................................................................ 10
Changes to Ordering Guide .......................................................... 28
2/09—Rev. A to Rev. B
Changes to Reference Current Parameter, Table 1........................3
Changes to IDD (Normal Mode) Parameter, Table 1......................4
Changes to Reference Current Parameter, Table 2........................5
Changes to IDD (Normal Mode) Parameter, Table 2......................6
11/05—Rev. 0 to Rev. A
Change to Specifications ..................................................................3
10/05—Revision 0: Initial Version
Rev. G | Page 2 of 32
Data Sheet
AD5628/AD5648/AD5668
SPECIFICATIONS
VDD = 4.5 V to 5.5 V, RL = 2 kΩ to GND, CL = 200 pF to GND, VREFIN = VDD. All specifications TMIN to TMAX, unless otherwise noted.
Table 1.
Parameter
STATIC PERFORMANCE 2
AD5628
Resolution
Relative Accuracy
Differential Nonlinearity
A Grade 1
Min
Typ Max
B Grade1
Min
Typ Max
12
12
±0.5
±1
±0.25
Bits
LSB
LSB
±2
±4
±0.5
Bits
LSB
LSB
±32
±1
±8
±16
±1
Bits
LSB
LSB
19
6
±2
−0.2
19
±0.5
±4
±0.25
±2
±8
±0.5
±8
Zero-Code Error
Zero-Code Error Drift
Full-Scale Error
6
±2
−0.2
Gain Error
Gain Temperature Coefficient
Offset Error
DC Power Supply Rejection Ratio
DC Crosstalk
(External Reference)
±2.5
±6
–80
10
AD5648
Resolution
Relative Accuracy
Differential Nonlinearity
AD5668
Resolution
Relative Accuracy
Differential Nonlinearity
14
OUTPUT CHARACTERISTICS
Output Voltage Range
Capacitive Load Stability
14
16
16
−1
±1
DC Crosstalk
(Internal Reference)
Unit
−1
±1
±2.5
±6
–80
10
±19
±19
mV
µV/°C
% FSR
% FSR
ppm
mV
dB
µV
5
10
25
5
10
25
µV/mA
µV
µV
10
10
µV/mA
Conditions/Comments
See Figure 9
Guaranteed monotonic by design
(see Figure 12)
See Figure 8
Guaranteed monotonic by design
(see Figure 11)
See Figure 7
Guaranteed monotonic by design
(see Figure 10)
All 0s loaded to DAC register (see Figure 26)
All 1s loaded to DAC register
(see Figure 27)
Of FSR/°C
VDD ± 10%
Due to full-scale output change,
RL = 2 kΩ to GND or VDD
Due to load current change
Due to powering down (per channel)
Due to full-scale output change,
RL = 2 kΩ to GND or VDD
Due to load current change
3
DC Output Impedance
Short-Circuit Current
Power-Up Time
REFERENCE INPUTS
Reference Current
Reference Input Range
Reference Input Impedance
REFERENCE OUTPUT
Output Voltage
AD56x8-2, AD56x8-3
Reference TC3
Reference Output Impedance
0
VDD
0
2
10
0.5
30
4
40
0
55
VDD
40
0
14.6
2.495
5
15
7.5
VDD
2
10
0.5
30
4
2.495
5
5
7.5
Rev. G | Page 3 of 32
RL = ∞
RL = 2 kΩ
VDD = 5 V
Coming out of power-down mode, VDD = 5 V
55
VDD
µA
V
kΩ
VREF = VDD = 5.5 V (per DAC channel)
2.505
10
10
V
ppm/°C
ppm/°C
kΩ
At ambient
TSSOP
LFCSP
14.6
2.505
10
V
nF
nF
Ω
mA
µs
AD5628/AD5648/AD5668
Parameter
LOGIC INPUTS3
Input Current
Input Low Voltage, VINL
Input High Voltage, VINH
Pin Capacitance
POWER REQUIREMENTS
VDD
IDD (Normal Mode) 4
VDD = 4.5 V to 5.5 V
VDD = 4.5 V to 5.5 V
IDD (All Power-Down Modes) 5
VDD = 4.5 V to 5.5 V
Data Sheet
A Grade 1
Min
Typ Max
B Grade1
Min
Typ Max
±3
0.8
2
Unit
Conditions/Comments
±3
0.8
µA
V
V
pF
All digital inputs
VDD = 5 V
VDD = 5 V
5.5
V
2
3
4.5
3
5.5
4.5
1.0
1.8
1.5
2.25
1.0
1.7
1.5
2.25
mA
mA
All digital inputs at 0 or VDD,
DAC active, excludes load current
VIH = VDD and VIL = GND
Internal reference off
Internal reference on
0.4
1
0.4
1
µA
VIH = VDD and VIL = GND
Temperature range is −40°C to +105°C, typical at 25°C.
Linearity calculated using a reduced code range of AD5628 (Code 32 to Code 4064), AD5648 (Code 128 to Code 16,256), and AD5668 (Code 512 to 65,024). Output
unloaded.
3
Guaranteed by design and characterization; not production tested.
4
Interface inactive. All DACs active. DAC outputs unloaded.
5
All eight DACs powered down.
1
2
Rev. G | Page 4 of 32
Data Sheet
AD5628/AD5648/AD5668
VDD = 2.7 V to 3.6 V, RL = 2 kΩ to GND, CL = 200 pF to GND, VREFIN = VDD. All specifications TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
STATIC PERFORMANCE 2
AD5628
Resolution
Relative Accuracy
Differential Nonlinearity
AD5648
Resolution
Relative Accuracy
Differential Nonlinearity
AD5668
Resolution
Relative Accuracy
Differential Nonlinearity
A Grade 1
Min
Typ Max
B Grade1
Min
Typ Max
12
12
Reference Output
Impedance
±2
±8
±0.5
±0.5
±1
±0.25
Bits
LSB
LSB
±2
±4
±0.5
Bits
LSB
LSB
Bits
LSB
LSB
14
16
16
±8
±32
±1
±8
±16
±1
6
±2
−0.2
19
6
±2
−0.2
19
±2.5
±6
–80
DC Crosstalk 3
(Internal Reference)
DC Output Impedance
Short-Circuit Current
Power-Up Time
REFERENCE INPUTS
Reference Current
Reference Input Range
Reference Input Impedance
REFERENCE OUTPUT
Output Voltage
AD5628/AD5648/AD5668-1
Reference TC3
±4
±0.25
14
Zero-Code Error
Zero-Code Error Drift
Full-Scale Error
Gain Error
Gain Temperature Coefficient
Offset Error
DC Power Supply Rejection
Ratio3
DC Crosstalk 3
(External Reference)
OUTPUT CHARACTERISTICS 3
Output Voltage Range
Capacitive Load Stability
±0.5
−1
±1
±2.5
±6
–80
±19
Unit
−1
±1
±19
mV
µV/°C
% FSR
% FSR
ppm
mV
dB
10
10
µV
5
10
25
5
10
25
µV/mA
µV
µV
10
10
µV/mA
0
VDD
0
VDD
2
10
0.5
30
4
40
0
2
10
0.5
30
4
55
VDD
40
0
14.6
1.247
5
15
7.5
55
VDD
14.6
1.253
15
1.247
5
5
15
7.5
Conditions/Comments
See Figure 9
Guaranteed monotonic by design
(see Figure 12)
See Figure 8
Guaranteed monotonic by design
(see Figure 11)
See Figure 7
Guaranteed monotonic by design
(see Figure 10)
All 0s loaded to DAC register (see Figure 26)
All 1s loaded to DAC register (see Figure 27)
Of FSR/°C
VDD ± 10%
Due to full-scale output change,
RL = 2 kΩ to GND or VDD
Due to load current change
Due to powering down (per channel)
Due to full-scale output change,
RL = 2 kΩ to GND or VDD
Due to load current change
V
nF
nF
Ω
mA
µs
VDD = 3 V
Coming out of power-down mode, VDD = 3 V
µA
VREF = VDD = 5.5 V (per DAC channel)
RL = ∞
RL = 2 kΩ
kΩ
1.253
15
15
Rev. G | Page 5 of 32
V
ppm/°C
ppm/°C
ppm/°C
kΩ
At ambient
TSSOP
LFCSP
WLCSP
AD5628/AD5648/AD5668
Parameter
LOGIC INPUTS3
Input Current
Input Low Voltage, VINL
Input High Voltage, VINH
Pin Capacitance
POWER REQUIREMENTS
VDD
IDD (Normal Mode) 4
VDD = 2.7 V to 3.6 V
VDD = 2.7 V to 3.6 V
IDD (All Power-Down Modes) 5
VDD = 2.7 V to 3.6 V
Data Sheet
A Grade 1
Min
Typ Max
B Grade1
Min
Typ Max
±3
0.8
2
Unit
Conditions/Comments
±3
0.8
µA
V
V
pF
All digital inputs
VDD = 3 V
VDD = 3 V
3.6
V
2
3
2.7
3
3.6
2.7
1.0
1.8
1.5
2.25
1.0
1.7
1.5
2.25
mA
mA
All digital inputs at 0 or VDD,
DAC active, excludes load current
VIH = VDD and VIL = GND
Internal reference off
Internal reference on
0.2
1
0.2
1
µA
VIH = VDD and VIL = GND
Temperature range is −40°C to +105°C, typical at 25°C.
Linearity calculated using a reduced code range of AD5628 (Code 32 to Code 4064), AD5648 (Code 128 to Code 16256), and AD5668 (Code 512 to 65024). Output
unloaded.
3
Guaranteed by design and characterization; not production tested.
4
Interface inactive. All DACs active. DAC outputs unloaded.
5
All eight DACs powered down.
1
2
AC CHARACTERISTICS
VDD = 2.7 V to 5.5 V, RL = 2 kΩ to GND, CL = 200 pF to GND, VREFIN = VDD. All specifications TMIN to TMAX, unless otherwise noted.
Table 3.
Parameter 1, 2
Output Voltage Settling Time
Slew Rate
Digital-to-Analog Glitch Impulse
Digital Feedthrough
Digital Crosstalk
Analog Crosstalk
DAC-to-DAC Crosstalk
Multiplying Bandwidth
Total Harmonic Distortion
Output Noise Spectral Density
Output Noise
Min
Typ
2.5
1.2
4
Max
7
19
0.1
0.2
0.4
0.8
320
−80
120
100
12
Unit
µs
V/µs
nV-s
nV-s
nV-s
nV-s
nV-s
nV-s
kHz
dB
nV/√Hz
nV/√Hz
μV p-p
Conditions/Comments 3
¼ to ¾ scale settling to ±2 LSB (16-bit resolution)
1 LSB(16-bit resolution) change around major carry
(see Figure 42)
From code 0xEA00 to code 0xE9FF (16-bit resolution)
VREF = 2 V ± 0.2 V p-p
VREF = 2 V ± 0.1 V p-p, frequency = 10 kHz
DAC code = 0x8400(16-bit resolution), 1 kHz
DAC code = 0x8400(16-bit resolution), 10 kHz
0.1 Hz to 10 Hz, DAC code = 0x0000
Guaranteed by design and characterization; not production tested.
See the Terminology section.
3
Temperature range is −40°C to +105°C, typical at 25°C.
1
2
Rev. G | Page 6 of 32
Data Sheet
AD5628/AD5648/AD5668
TIMING CHARACTERISTICS
All input signals are specified with tr = tf = 1 ns/V (10% to 90% of VDD) and timed from a voltage level of (VIL + VIH)/2. See Figure 2.
VDD = 2.7 V to 5.5 V. All specifications TMIN to TMAX, unless otherwise noted.
Table 4.
Limit at TMIN, TMAX
VDD = 2.7 V to 5.5 V
20
8
8
13
4
4
0
15
13
0
10
15
5
0
300
Parameter
t1 1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
t12
t13
t14
t15
Conditions/Comments
SCLK cycle time
SCLK high time
SCLK low time
SYNC to SCLK falling edge set-up time
Data set-up time
Data hold time
SCLK falling edge to SYNC rising edge
Minimum SYNC high time
SYNC rising edge to SCLK fall ignore
SCLK falling edge to SYNC fall ignore
LDAC pulse width low
SCLK falling edge to LDAC rising edge
CLR pulse width low
SCLK falling edge to LDAC falling edge
CLR pulse activation time
Maximum SCLK frequency is 50 MHz at VDD = 2.7 V to 5.5 V. Guaranteed by design and characterization; not production tested.
t10
t1
t9
SCLK
t8
t3
t4
t2
t7
SYNC
t6
t5
DIN
DB31
DB0
t14
t11
LDAC1
t12
LDAC2
CLR
VOUT
t13
t15
05302-002
1
Unit
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns min
ns typ
1ASYNCHRONOUS LDAC UPDATE MODE.
2SYNCHRONOUS LDAC UPDATE MODE.
Figure 2. Serial Write Operation
Rev. G | Page 7 of 32
AD5628/AD5648/AD5668
Data Sheet
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 5.
Parameter
VDD to GND
Digital Input Voltage to GND
VOUT to GND
VREFIN/VREFOUT to GND
Operating Temperature Range
Industrial
Storage Temperature Range
Junction Temperature (TJ MAX)
TSSOP Package
Power Dissipation
θJA Thermal Impedance
Reflow Soldering Peak Temperature
Pb Free
Rating
−0.3 V to +7 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−0.3 V to VDD + 0.3 V
−40°C to +105°C
−65°C to +150°C
150°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
(TJ MAX − TA)/θJA
150.4°C/W
260°C
Rev. G | Page 8 of 32
Data Sheet
AD5628/AD5648/AD5668
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
13 DIN
14 SCLK
16 SYNC
15 LDAC
AD5628/AD5668
VDD 1
13 DIN
VOUTA
3
VOUTC
4
VOUTE
5
VOUTG
6
VREFIN/VREFOUT
7
TOP VIEW
(Not to Scale)
DIN
VOUTE 4
14
GND
VDD
3
AD5628/
AD5648/
AD5668
12 GND
VOUTA 4
11 VOUTB
VOUTC 5
10 VOUTD
VOUTE 6
11
VOUTF
9
VOUTF
VOUTG 7
10
VOUTH
8
VOUTH
8
9
05302-003
AD5628/
AD5648/
15
VREFIN/VREFOUT
TOP VIEW
(Not to Scale)
13
VOUTB
12
VOUTD
CLR
Figure 4. 16-Lead TSSOP (RU-16)
Figure 3. 14-Lead TSSOP (RU-14)
10 VOUTD
9
VOUTF
NOTES
1. EXPOSED PAD MUST BE TIED TO GND.
05302-005
2
SYNC 2
TOP VIEW
(Not to Scale)
CLR 7
VDD
VOUTC 3
11 VOUTB
VOUTH 8
14 SCLK
SCLK
VOUTG 5
1
16
05302-004
SYNC
LDAC 1
12 GND
VREFIN/VREFOUT 6
VOUTA 2
Figure 5. 16-Lead LFCSP(CP-16-17)
Table 6. Pin Function Descriptions
Pin No.
14-Lead
TSSOP
16-Lead
TSSOP
Mnemonic
Description
1
16-Lead
LFCSP
15
N/A
LDAC
1
2
16
SYNC
2
3
1
VDD
3
11
4
10
7
4
13
5
12
8
2
11
3
10
6
VOUTA
VOUTB
VOUTC
VOUTD
VREFIN/
VREFOUT
N/A
9
7
CLR
5
9
6
8
12
13
6
11
7
10
14
15
4
9
5
8
12
13
VOUTE
VOUTF
VOUTG
VOUTH
GND
DIN
14
16
14
SCLK
EPAD
EPAD
Pulsing this pin low allows any or all DAC registers to be updated if the input registers
have new data. This allows all DAC outputs to simultaneously update. Alternatively, this
pin can be tied permanently low.
Active Low Control Input. This is the frame synchronization signal for the input data.
When SYNC goes low, it powers on the SCLK and DIN buffers and enables the input shift
register. Data is transferred in on the falling edges of the next 32 clocks. If SYNC is taken
high before the 32nd falling edge, the rising edge of SYNC acts as an interrupt and the
write sequence is ignored by the device.
Power Supply Input. These parts can be operated from 2.7 V to 5.5 V, and the supply
should be decoupled with a 10 μF capacitor in parallel with a 0.1 μF capacitor to GND.
Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC C. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC D. The output amplifier has rail-to-rail operation.
The AD5628/AD5648/AD5668 have a common pin for reference input and reference
output. When using the internal reference, this is the reference output pin. When using
an external reference, this is the reference input pin. The default for this pin is as a
reference input.
Asynchronous Clear Input. The CLR input is falling edge sensitive. When CLR is low, all
LDAC pulses are ignored. When CLR is activated, the input register and the DAC register
are updated with the data contained in the CLR code register—zero, midscale, or full
scale. Default setting clears the output to 0 V.
Analog Output Voltage from DAC E. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC F. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC G. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC H. The output amplifier has rail-to-rail operation.
Ground Reference Point for All Circuitry on the Part.
Serial Data Input. This device has a 32-bit shift register. Data is clocked into the register
on the falling edge of the serial clock input.
Serial Clock Input. Data is clocked into the input shift register on the falling edge of the
serial clock input. Data can be transferred at rates of up to 50 MHz.
It is recommended that the exposed paddle be soldered to the ground plane.
Rev. G | Page 9 of 32
AD5628/AD5648/AD5668
Data Sheet
BALL A1
INDICATOR
2
1
GND
SCL
3
4
DIN
SYNC
A
VOUTB LDAC
VDD VOUTA
B
VOUTF VOUTD VOUTE VOUTC
VOUTH CLR
VREF VOUTG
D
05302-006
C
TOP VIEW
(BALL SIDE DOWN)
Not to Scale
Figure 6. 16-Lead WLCSP
Table 7. 16-Lead WLCSP Pin Function Descriptions
Pin. No.
B2
Mnemonic
Description
LDAC
A4
SYNC
B3
VDD
B4
B1
C4
C2
D3
VOUTA
VOUTB
VOUTC
VOUTD
VREFIN/VREFOUT
D2
CLR
C3
C1
D4
D1
A1
A3
VOUTE
VOUTF
VOUTG
VOUTH
GND
DIN
A4
SCLK
Pulsing this pin low allows any or all DAC registers to be updated if the input registers have new data. This allows
all DAC outputs to simultaneously update. Alternatively, this pin can be tied permanently low.
Active Low Control Input. This is the frame synchronization signal for the input data. When SYNC goes low, it
powers on the SCLK and DIN buffers and enables the input shift register. Data is transferred in on the falling edges
of the next 32 clocks. If SYNC is taken high before the 32nd falling edge, the rising edge of SYNC acts as an
interrupt and the write sequence is ignored by the device.
Power Supply Input. These parts can be operated from 2.7 V to 5.5 V, and the supply should be decoupled with a
10 μF capacitor in parallel with a 0.1 μF capacitor to GND.
Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC C. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC D. The output amplifier has rail-to-rail operation.
The AD5628/AD5648/AD5668 have a common pin for reference input and reference output. When using the
internal reference, this is the reference output pin. When using an external reference, this is the reference input
pin. The default for this pin is as a reference input.
Asynchronous Clear Input. The CLR input is falling edge sensitive. When CLR is low, all LDAC pulses are ignored.
When CLR is activated, the input register and the DAC register are updated with the data contained in the CLR
code register—zero, midscale, or full scale. Default setting clears the output to 0 V.
Analog Output Voltage from DAC E. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC F. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC G. The output amplifier has rail-to-rail operation.
Analog Output Voltage from DAC H. The output amplifier has rail-to-rail operation.
Ground Reference Point for All Circuitry on the Part.
Serial Data Input. This device has a 32-bit shift register. Data is clocked into the register on the falling edge of the
serial clock input.
Serial Clock Input. Data is clocked into the input shift register on the falling edge of the serial clock input. Data can
be transferred at rates of up to 50 MHz.
Rev. G | Page 10 of 32
Data Sheet
AD5628/AD5648/AD5668
TYPICAL PERFORMANCE CHARACTERISTICS
8
0.6
4
0.4
2
0.2
DNL (LSB)
6
0
–2
0
–0.2
–4
–0.4
–6
–0.6
–8
–0.8
–10
0
10k
20k
30k
40k
50k
60k 65535
CODES
VDD = 5V
EXT REF = 5V
TA = 25°C
0.8
–1.0
05302-106
INL (LSB)
1.0
VDD = 5V
EXT REF = 5V
TA = 25°C
0
30k
40k
50k
60k 65535
Figure 10. DNL AD5668—External Reference
0.5
VDD = 5V
EXT REF = 5V
TA = 25°C
3
20k
CODES
Figure 7. INL AD5668—External Reference
4
10k
05302-109
10
VDD = 5V
0.4 EXT REF = 5V
TA = 25°C
0.3
2
0.2
INL (LSB)
INL (LSB)
1
0
–1
0.1
0
–0.1
–0.2
–2
–0.3
–3
5k
10k
15k 16384
CODES
–0.5
05302-107
0
0
15k 16384
Figure 11. DNL AD5648—External Reference
0.20
VDD = 5V
EXT REF = 5V
TA = 25°C
0.8
10k
CODES
Figure 8. INL AD5648—External Reference
1.0
5k
05302-110
–0.4
–4
VDD = 5V
EXT REF = 5V
0.15 TA = 25°C
0.6
0.10
DNL (LSB)
0.2
0
–0.2
0.05
0
–0.05
–0.4
–0.10
–0.6
–1.0
0
500
1000
1500
2000
2500
3000
3500
CODES
4095
Figure 9. INL AD5628—External Reference
–0.20
0
500
1000
1500
2000
2500
3000
3500
CODES
Figure 12. DNL AD5628—External Reference
Rev. G | Page 11 of 32
4095
05302-111
–0.15
–0.8
05302-108
INL (LSB)
0.4
AD5628/AD5648/AD5668
10
Data Sheet
1.0
VDD = 5V
INT REF = 2.5V
TA = 25°C
0.5
DNL (LSB)
5
0
–5
0
–0.5
0
10k
20k
30k
40k
50k
60k 65535
CODES
–1.0
05302-112
–10
0
20k
10k
30k
40k
50k
60k 65535
CODES
Figure 13. INL AD5668-2/AD5668-3
05302-115
INL (LSB)
VDD = 5V
INT REF = 2.5V
TA = 25°C
Figure 16. DNL AD5668-2/AD5668-3
4
0.5
VDD = 5V
EXT REF = 5V
3 T = 25°C
A
VDD = 5V
0.4 EXT REF = 2.5V
TA = 25°C
0.3
2
0.2
DNL (LSB)
INL (LSB)
1
0
–1
0.1
0
–0.1
–0.2
–2
–0.3
–3
5k
10k
15k 16383
CODES
–0.5
05302-113
0
0
5k
Figure 14. INL AD5648-2
15k 16383
Figure 17. DNL AD5648-2
0.20
1.0
VDD = 5V
INT REF = 2.5V
0.15 TA = 25°C
VDD = 5V
INT REF = 2.5V
TA = 25°C
0.10
DNL (LSB)
0.5
0
0.05
0
–0.05
–0.10
–0.5
–1.0
0
500
1000
1500
2000
2500
CODES
3000
3500
4095
–0.20
0
500
1000
1500
2000
2500
3000
CODES
Figure 18. DNL AD5628-2
Figure 15. INL AD5628-2
Rev. G | Page 12 of 32
3500
4095
05302-117
–0.15
05302-114
INL (LSB)
10k
CODES
05302-116
–0.4
–4
Data Sheet
AD5628/AD5648/AD5668
10
1.0
VDD = 3V
INT REF = 1.25V
TA = 25°C
8
VDD = 3V
INT REF = 1.25V
TA = 25°C
6
0.5
2
DNL (LSB)
INL (LSB)
4
0
–2
0
–4
–0.5
–6
0
10k
20k
30k
40k
50k
60k 65535
CODES
–1.0
05302-118
–10
0
10k
20k
30k
40k
50k
60k 65535
CODES
Figure 19. INL AD5668-1
05302-121
–8
Figure 22. DNL AD5668-1
4
0.5
VDD = 3V
EXT REF = 1.25V
3 T = 25°C
A
VDD = 3V
0.4 EXT REF = 1.25V
TA = 25°C
0.3
2
0.2
DNL (LSB)
INL (LSB)
1
0
–1
0.1
0
–0.1
–0.2
–2
–0.3
–3
5k
10k
15k 16383
CODES
–0.5
05302-119
0
0
5k
Figure 20. INL AD5648-1
1.0
Figure 23. DNL AD5648-1
0.20
VDD = 3V
INT REF = 1.25V
TA = 25°C
VDD = 3V
INT REF = 1.25V
TA = 25°C
0.15
0.5
DNL (LSB)
0.10
0
0.05
0
–0.05
–0.5
–0.10
–1.0
0
500
1000
1500
2000
2500
CODES
3000
3500
4095
Figure 21. INL AD5628-1
–0.20
0
500
1000
1500
2000
2500
3000
CODES
Figure 24. DNL AD5628-1
Rev. G | Page 13 of 32
3500
4095
05302-123
–0.15
05302-120
INL (LSB)
15k 16383
10k
CODES
05302-122
–0.4
–4
AD5628/AD5648/AD5668
Data Sheet
0
1.95
VDD = 5V
TA = 25°C
1.90
–0.05
OFFSET ERROR
ERROR (mV)
ERROR (% FSR)
1.85
–0.10
FULL-SCALE ERROR
–0.15
1.80
1.75
1.70
ZERO-SCALE ERROR
–0.20
GAIN ERROR
1.65
–0.25
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
1.55
2.7
05302-124
–0.30
–40
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VDD (V)
Figure 25. Gain Error and Full-Scale Error vs. Temperature
05302-127
1.60
Figure 28. Zero-Scale Error and Offset Error vs. Supply Voltage
21
6
VDD = 5V
18
5
OFFSET ERROR
15
NUMBER OF HITS
ERROR (mV)
4
ZERO-SCALE ERROR
3
2
12
9
6
1
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
0
0.85
Figure 26. Zero-Scale Error and Offset Error vs. Temperature
0.90
0.95
1.00
IDD WITH EXTERNAL REFERENCE (mA)
1.05
05302-128
–25
05302-125
0
–40
3
Figure 29. IDD Histogram with External Reference
18
–0.16
TA = 25°C
FULL-SCALE ERROR
–0.17
16
–0.18
14
NUMBER OF HITS
–0.20
–0.21
–0.22
–0.23
10
8
6
GAIN ERROR
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VDD (V)
0
1.65
1.70
1.75
1.80
1.85
IDD WITH INTERNAL REFERENCE (mA)
Figure 30. IDD Histogram with Internal Reference
Figure 27. Gain Error and Full-Scale Error vs. Supply Voltage
Rev. G | Page 14 of 32
1.190
05302-129
2
–0.25
–0.26
2.7
12
4
–0.24
05302-126
ERROR (% FSR)
–0.19
Data Sheet
AD5628/AD5648/AD5668
1.8
0.4
TA = 25°C
TA = 25°C
1.7
0.3
1.6
0
VDD = 5V
1.5
0.1
VDD = 3V, INT REF = 1.25V
IDD (mA)
–0.1
1.4
VDD = 3V
1.3
1.2
–0.2
1.1
–0.3
1.0
VDD = 5V, INT REF = 2.5V
–0.4
0.9
–8
–6
–4
–2
0
2
4
6
8
10
SOURCE/SINK CURRENT (mA)
0.8
05302-130
–0.5
–10
0
10k
20k
30k
40k
50k
05302-133
ERROR VOLTAGE (V)
0.2
60k
DIGITAL CODES (Decimal)
Figure 34. Supply Current vs. Code
Figure 31. Headroom at Rails vs. Source and Sink
6
2.0
VDD = 5V
INT REF = 2.5V
T
5
A = 25°C
FULL SCALE
1.9
1.8
3/4 SCALE
3
1.7
IDD (mA)
VOUT (V)
4
MIDSCALE
2
VDD = 5.5V
1.6
1.5
VDD = 3.6V
1.4
1/4 SCALE
1.3
1
1.2
0
–0.02
–0.01
0
0.01
0.02
0.03
CURRENT (A)
1.0
–40
05302-131
–1
–0.03
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
Figure 32. AD5668-2/AD5668-3 Source and Sink Capability
05302-134
1.1
ZERO SCALE
Figure 35. Supply Current vs. Temperature
1.48
4.0
VDD = 3V
3.5 INT REF = 1.25V
TA = 25°C
TA = 25°C
1.46
3.0
FULL SCALE
1.44
1.5
IDD (mA)
3/4 SCALE
2.0
MIDSCALE
1.42
1.40
1.0
1/4 SCALE
1.38
0.5
ZERO SCALE
0
1.36
–1.0
–0.03
–0.02
–0.01
0
0.01
0.02
CURRENT (A)
0.03
1.34
2.7
3.1
3.5
3.9
4.3
4.7
5.1
VDD (V)
Figure 36. Supply Current vs. Supply Voltage
Figure 33. AD5668-1 Source and Sink Capability
Rev. G | Page 15 of 32
5.5
05302-135
–0.5
05302-132
VOUT (V)
2.5
AD5628/AD5648/AD5668
2.3
Data Sheet
5.5
TA = 25°C
2.1
VDD = 5V
5.0 EXT REF = 5V
TA = 25°C
4.5
1.9
4.0
VOLTAGE (V)
IDD (mA)
VDD
3.5
1.7
VDD = 5V
1.5
1.3
3.0
2.5
VOUTA
2.0
1.5
1.1
1.0
VDD = 3V
0.9
0.5
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VLOGIC (V)
05302-136
0
–0.5
–0.0010
5
–0.0002
0.0002
0.0006
0.0010
TIME (s)
Figure 37. Supply Current vs. Logic Input Voltage
6
–0.0006
05302-139
0
0.7
Figure 40. Power-On Reset to Midscale
5.5
VDD = 5V
EXT REF = 5V
TA = 25°C
5.0
4.5
24TH CLK RISING EDGE
VDD = 5V
EXT REF = 5V
TA = 25°C
4.0
3.5
VOLTAGE (V)
VOUT (V)
4
3
3.0
2.5
VOUTA
2.0
2
1.5
1.0
1
0.5
2
4
6
8
TIME (µs)
05302-137
0
–0.5
–10
5.0
4.5
5
10
Figure 41. Exiting Power-Down to Midscale
VDD = 5V
EXT REF = 5V
TA = 25°C
4.0
0
TIME (µs)
Figure 38. Full-Scale Settling Time, 5 V
5.5
–5
T
VDD = 5V
EXT REF = 5V
TA = 25°C
VDD
3.0
VOUTA
2.5
3
2.0
1.5
1.0
24TH CLK RISING EDGE
0.5
VOUTA
–0.0006
–0.0002
0.0002
0.0006
TIME (s)
0.0010
Figure 39. Power-On Reset to 0 V
4
CH3 10.0mV
B
W
CH4 5.0V
M400ns
T 17.0%
A CH4
1.50V
Figure 42. Digital-to-Analog Glitch Impulse (Negative)
Rev. G | Page 16 of 32
05302-141
0
–0.5
–0.0010
05302-138
VOLTAGE (V)
3.5
05302-140
0
0
–2
Data Sheet
0.0010
AD5628/AD5648/AD5668
0.20
VDD = 5V
EXT REF = 5V
TA = 25°C
EXT REF = 2.5V
0.15
0.10
OUTPUT NOISE (V)
GLITCH AMPLITUDE (V)
0.0005
0
–0.0005
0.05
0
–0.05
–0.10
–0.0010
–0.15
1
2
3
4
5
6
7
8
9
TIME (µs)
–0.20
0
3
4
5
6
7
8
9
10
Figure 46. 0.1 Hz to 10 Hz Output Noise Plot, External Reference
0.0020
0.20
VDD = 5V
EXT REF = 5V
TA = 25°C
0.0015
INT REF = 1.25V
0.15
0.10
0.0010
OUTPUT NOISE (V)
0.0005
0
–0.0005
0.05
0
–0.05
–0.10
–0.0010
–0.15
1
2
3
4
5
6
7
8
TIME (µs)
–0.20
0
2
3
4
5
6
7
8
9
10
TIME (s)
Figure 44. DAC-to-DAC Crosstalk
0.06
1
05302-146
0
05302-143
–0.0015
Figure 47. 0.1 Hz to 10 Hz Output Noise Plot, Internal Reference
800
EXT REF = 5V
700
OUTPUT NOISE (nV/ Hz)
0.04
0.02
0
–0.02
–0.04
–0.06
600
500
400
VREF = 2.5V
300
200
100
0
1
2
3
4
5
6
7
8
9
10
TIME (s)
05302-144
VREF = 1.25V
–0.08
Figure 45. 0.1 Hz to 10 Hz Output Noise Plot, External Reference
0
100
1k
10k
100k
FREQUENCY (Hz)
Figure 48. Noise Spectral Density, Internal Reference
Rev. G | Page 17 of 32
1M
05302-147
GLITCH AMPLITUDE (V)
2
TIME (s)
Figure 43. Analog Crosstalk
OUTPUT VOLTAGE (V)
1
05302-145
0
05302-142
–0.0015
AD5628/AD5648/AD5668
Data Sheet
10
0
VDD = 5.5V
EXT REF = 5V
–20 TA = 25°C
VREF = 2V ± 0.1V p-p
FREQUENCY = 10kHz
–40
0
–10
–80
–30
–40
–50
–100
–60
–120
–70
0
2000
4000
6000
8000
10,000
FREQUENCY (Hz)
–80
10
05302-148
–140
CH A
CH B
CH C
CH D
CH E
CH F
CH G
CH H
–3dB
100
VDD = 5.5V
EXT REF = 5V
TA = 25°C
VREF = 2V ± 0.2V p-p
1k
1k0
100k
1M
Figure 52. Multiplying Bandwidth
1.2510
TA = 25°C
VDD = 5.5V
1.2508
8
1.2506
VDD = EXTERNAL REFERENCE = 5V
REFERENCE (ppm/°C)
7
SETTLING TIME (µs)
100M
FREQUENCY (Hz)
Figure 49. Total Harmonic Distortion
9
10M
05302-151
VOUT (dBm)
THD (dB)
–20
–60
6
5
4
3
1.2504
1.2502
1.2500
1.2498
1.2496
VDD = EXTERNAL REFERENCE = 3V
1.2494
2
1.2492
1
1
2
3
4
5
6
7
8
9
10
CAPACITIVE LOAD (nF)
–40
05302-149
0
25
05302-152
1.2490
0
105
TEMPERATURE (°C)
Figure 53. 1.25 V Reference Temperature Coefficient vs. Temperature
Figure 50. Settling Time vs. Capacitive Load
2.503
5.5
EXT REF = 5V
5.0
2.502
4.5
2.501
REFERENCE (ppm/°C)
4.0
3.0
VOUTA
2.5
2.0
1.5
CLR PULSE
2.500
2.499
2.498
2.497
1.0
0.5
2.496
–0.5
–10
–5
0
TIME (µs)
5
10
Figure 51. Hardware CLR
2.495
105
25
TEMPERATURE (°C)
–40
05302-154
0
05302-150
VOLTAGE (V)
3.5
Figure 54. 2.5 V Reference Temperature Coefficient vs. Temperature
Rev. G | Page 18 of 32
Data Sheet
AD5628/AD5648/AD5668
TERMINOLOGY
Relative Accuracy
For the DAC, relative accuracy, or integral nonlinearity (INL), is
a measure of the maximum deviation in LSBs from a straight line
passing through the endpoints of the DAC transfer function.
Figure 7 to Figure 9, Figure 13 to Figure 15, and Figure 19 to
Figure 21 show plots of typical INL vs. code.
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between the
measured change and the ideal 1 LSB change between any two
adjacent codes. A specified differential nonlinearity of ±1 LSB
maximum ensures monotonicity. This DAC is guaranteed monotonic by design. Figure 10 to Figure 12, Figure 16 to Figure 18,
and Figure 22 to Figure 24 show plots of typical DNL vs. code.
Offset Error
Offset error is a measure of the difference between the actual
VOUT and the ideal VOUT, expressed in millivolts in the linear
region of the transfer function. Offset error is measured on the
AD5668 with Code 512 loaded into the DAC register. It can be
negative or positive and is expressed in millivolts.
Zero-Code Error
Zero-code error is a measure of the output error when zero
code (0x0000) is loaded into the DAC register. Ideally, the
output should be 0 V. The zero-code error is always positive in
the AD5628/AD5648/AD5668, because the output of the DAC
cannot go below 0 V. It is due to a combination of the offset
errors in the DAC and output amplifier. Zero-code error is
expressed in millivolts. Figure 28 shows a plot of typical zerocode error vs. temperature.
Gain Error
Gain error is a measure of the span error of the DAC. It is the
deviation in slope of the DAC transfer characteristic from the
ideal, expressed as a percentage of the full-scale range.
Zero-Code Error Drift
Zero-code error drift is a measure of the change in zero-code
error with a change in temperature. It is expressed in µV/°C.
Gain Error Drift
Gain error drift is a measure of the change in gain error with
changes in temperature. It is expressed in (ppm of full-scale
range)/°C.
Full-Scale Error
Full-scale error is a measure of the output error when full-scale
code (0xFFFF) is loaded into the DAC register. Ideally, the
output should be VDD – 1 LSB. Full-scale error is expressed as a
percentage of the full-scale range. Figure 25 shows a plot of
typical full-scale error vs. temperature.
Digital-to-Analog Glitch Impulse
Digital-to-analog glitch impulse is the impulse injected into the
analog output when the input code in the DAC register changes
state. It is normally specified as the area of the glitch in nV-s and
is measured when the digital input code is changed by 1 LSB at
the major carry transition (0x7FFF to 0x8000). See Figure 42.
DC Power Supply Rejection Ratio (PSRR)
PSRR indicates how the output of the DAC is affected by changes
in the supply voltage. PSRR is the ratio of the change in VOUT to
a change in VDD for full-scale output of the DAC. It is measured
in decibels. VREF is held at 2 V, and VDD is varied ±10%.
DC Crosstalk
DC crosstalk is the dc change in the output level of one DAC in
response to a change in the output of another DAC. It is measured
with a full-scale output change on one DAC (or soft power-down
and power-up) while monitoring another DAC kept at midscale.
It is expressed in microvolts.
DC crosstalk due to load current change is a measure of the
impact that a change in load current on one DAC has to another
DAC kept at midscale. It is expressed in microvolts per milliamp.
Reference Feedthrough
Reference feedthrough is the ratio of the amplitude of the signal
at the DAC output to the reference input when the DAC output
is not being updated (that is, LDAC is high). It is expressed in
decibels.
Digital Feedthrough
Digital feedthrough is a measure of the impulse injected into
the analog output of a DAC from the digital input pins of the
device, but is measured when the DAC is not being written to
(SYNC held high). It is specified in nV-s and measured with a
full-scale change on the digital input pins, that is, from all 0s to
all 1s or vice versa.
Digital Crosstalk
Digital crosstalk is the glitch impulse transferred to the output
of one DAC at midscale in response to a full-scale code change
(all 0s to all 1s or vice versa) in the input register of another DAC.
It is measured in standalone mode and is expressed in nV-s.
Analog Crosstalk
Analog crosstalk is the glitch impulse transferred to the output
of one DAC due to a change in the output of another DAC. It is
measured by loading one of the input registers with a full-scale
code change (all 0s to all 1s or vice versa) while keeping LDAC
high, and then pulsing LDAC low and monitoring the output of
the DAC whose digital code has not changed. The area of the
glitch is expressed in nV-s.
Rev. G | Page 19 of 32
AD5628/AD5648/AD5668
Data Sheet
DAC-to-DAC Crosstalk
DAC-to-DAC crosstalk is the glitch impulse transferred to the
output of one DAC due to a digital code change and subsequent
output change of another DAC. This includes both digital and
analog crosstalk. It is measured by loading one of the DACs
with a full-scale code change (all 0s to all 1s or vice versa) with
LDAC low and monitoring the output of another DAC. The
energy of the glitch is expressed in nV-s.
Total Harmonic Distortion (THD)
Total harmonic distortion is the difference between an ideal
sine wave and its attenuated version using the DAC. The sine
wave is used as the reference for the DAC, and the THD is a
measure of the harmonics present on the DAC output. It is
measured in decibels.
Multiplying Bandwidth
The amplifiers within the DAC have a finite bandwidth. The
multiplying bandwidth is a measure of this. A sine wave on the
reference (with full-scale code loaded to the DAC) appears on
the output. The multiplying bandwidth is the frequency at
which the output amplitude falls to 3 dB below the input.
Rev. G | Page 20 of 32
Data Sheet
AD5628/AD5648/AD5668
THEORY OF OPERATION
D/A SECTION
R
The AD5628/AD5648/AD5668 DACs are fabricated on a
CMOS process. The architecture consists of a string of DACs
followed by an output buffer amplifier. Each part includes an
internal 1.25 V/2.5 V, 5 ppm/°C reference with an internal gain
of 2. Figure 55 shows a block diagram of the DAC architecture.
R
TO OUTPUT
AMPLIFIER
R
VDD
VREFIN
REF
OUTPUT
AMPLIFIER
(GAIN = ×2)
DAC
REGISTER
VOUT
R
R
05302-053
GND
05302-153
RESISTOR
STRING
Figure 55. DAC Architecture
Because the input coding to the DAC is straight binary, the ideal
output voltage when using an external reference is given by
Figure 56. Resistor String
INTERNAL REFERENCE
D
VOUT  VREFIN   N 
2 
The ideal output voltage when using the internal reference is
given by
D
VOUT  2  V REFOUT   N 
2 
where:
D = decimal equivalent of the binary code that is loaded to the
DAC register.
0 to 4095 for AD5628 (12 bits).
0 to 16,383 for AD5648 (14 bits).
0 to 65,535 for AD5668 (16 bits).
N = the DAC resolution.
The AD5628/AD5648/AD5668 have an on-chip reference with
an internal gain of 2. The AD5628/AD5648/AD5668-1 have a
1.25 V, 5 ppm/°C reference, giving a full-scale output of 2.5 V;
the AD5628/AD5648/AD5668-2, -3 have a 2.5 V, 5 ppm/°C
reference, giving a full-scale output of 5 V. The on-board
reference is off at power-up, allowing the use of an external
reference. The internal reference is enabled via a write to the
control register (see Table 8).
The internal reference associated with each part is available at
the VREFOUT pin. A buffer is required if the reference output is
used to drive external loads. When using the internal reference,
it is recommended that a 100 nF capacitor be placed between
the reference output and GND for reference stability.
Individual channel power-down is not supported while using
the internal reference.
RESISTOR STRING
The resistor string section is shown in Figure 56. It is simply a
string of resistors, each of value R. The code loaded into the
DAC register determines at which node on the string the
voltage is tapped off to be fed into the output amplifier. The
voltage is tapped off by closing one of the switches connecting
the string to the amplifier. Because it is a string of resistors, it is
guaranteed monotonic.
Rev. G | Page 21 of 32
AD5628/AD5648/AD5668
Data Sheet
Table 8. Command Definitions
OUTPUT AMPLIFIER
The output buffer amplifier can generate rail-to-rail voltages on
its output, which gives an output range of 0 V to VDD. The
amplifier is capable of driving a load of 2 kΩ in parallel with
200 pF to GND. The source and sink capabilities of the output
amplifier can be seen in Figure 32 and Figure 33. The slew rate
is 1.5 V/μs with a ¼ to ¾ scale settling time of 7 μs.
SERIAL INTERFACE
The AD5628/AD5648/AD5668 have a 3-wire serial interface
(SYNC, SCLK, and DIN) that is compatible with SPI, QSPI, and
MICROWIRE interface standards as well as most DSPs. See
Figure 2 for a timing diagram of a typical write sequence.
The write sequence begins by bringing the SYNC line low. Data
from the DIN line is clocked into the 32-bit shift register on the
falling edge of SCLK. The serial clock frequency can be as high
as 50 MHz, making the AD5628/AD5648/AD5668 compatible
with high speed DSPs. On the 32nd falling clock edge, the last
data bit is clocked in and the programmed function is executed,
that is, a change in DAC register contents and/or a change in
the mode of operation. At this stage, the SYNC line can be kept
low or be brought high. In either case, it must be brought high
for a minimum of 15 ns before the next write sequence so that a
falling edge of SYNC can initiate the next write sequence. SYNC
should be idled low between write sequences for even lower
power operation of the part. As is mentioned previously,
however, SYNC must be brought high again just before the next
write sequence.
C3
0
0
0
0
0
0
0
0
1
1
–
1
Command
C2 C1
0
0
0
0
0
1
0
1
1
1
1
0
0
–
1
1
0
0
1
1
0
0
–
1
C0
0
1
0
1
0
1
0
1
0
1
–
1
Description
Write to Input Register n
Update DAC Register n
Write to Input Register n, update all
(software LDAC)
Write to and update DAC Channel n
Power down/power up DAC
Load clear code register
Load LDAC register
Reset (power-on reset)
Set up internal REF register
Reserved
Reserved
Reserved
Table 9. Address Commands
A3
0
0
0
0
0
0
0
0
1
Rev. G | Page 22 of 32
Address (n)
A2
A1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
1
1
A0
0
1
0
1
0
1
0
1
1
Selected DAC Channel
DAC A
DAC B
DAC C
DAC D
DAC E
DAC F
DAC G
DAC H
All DACs
Data Sheet
AD5628/AD5648/AD5668
INPUT SHIFT REGISTER
SYNC INTERRUPT
The input shift register is 32 bits wide. The first four bits are
don’t cares. The next four bits are the command bits, C3 to C0
(see Table 8), followed by the 4-bit DAC address, A3 to A0 (see
Table 9) and finally the 16-/14-/12-bit data-word. The dataword comprises the 16-/14-/12-bit input code followed by four,
six, or eight don’t care bits for the AD5668, AD5648, and
AD5628, respectively (see Figure 57 through Figure 59). These
data bits are transferred to the DAC register on the 32nd falling
edge of SCLK.
In a normal write sequence, the SYNC line is kept low for
32 falling edges of SCLK, and the DAC is updated on the 32nd
falling edge and rising edge of SYNC. However, if SYNC is brought
high before the 32nd falling edge, this acts as an interrupt to the
write sequence. The shift register is reset, and the write sequence
is seen as invalid. Neither an update of the DAC register contents
nor a change in the operating mode occurs (see Figure 60).
DB31 (MSB)
X
X
DB0 (LSB)
X
X
C3
C2
C1
C0
A3
A2
A1
A0
D15 D14 D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
COMMAND BITS
05302-054
DATA BITS
ADDRESS BITS
Figure 57. AD5668 Input Register Contents
DB31 (MSB)
X
X
DB0 (LSB)
X
X
C3
C2
C1
C0
A3
A2
A1
A0
D13 D12 D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
COMMAND BITS
05302-055
DATA BITS
ADDRESS BITS
Figure 58. AD5648 Input Register Contents
DB31 (MSB)
X
X
X
C3
C2
C1
C0
A3
A2
A1
A0
D11 D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
X
X
COMMAND BITS
05302-056
DATA BITS
ADDRESS BITS
Figure 59. AD5628 Input Register Contents
SCLK
SYNC
DIN
DB31
DB0
INVALID WRITE SEQUENCE:
SYNC HIGH BEFORE 32ND FALLING EDGE
DB31
DB0
VALID WRITE SEQUENCE, OUTPUT UPDATES
ON THE 32ND FALLING EDGE
Figure 60. SYNC Interrupt Facility
Rev. G | Page 23 of 32
05302-057
X
DB0 (LSB)
AD5628/AD5648/AD5668
Data Sheet
INTERNAL REFERENCE REGISTER
The on-board reference is off at power-up by default. This allows
the use of an external reference if the application requires it. The
on-board reference can be turned on or off by a user-programmable internal REF register by setting Bit DB0 high or low (see
Table 10). Command 1000 is reserved for setting the internal
REF register (see Table 8). Table 12 shows how the state of the
bits in the input shift register corresponds to the mode of
operation of the device.
POWER-ON RESET
The AD5628/AD5648/AD5668 family contains a power-on
reset circuit that controls the output voltage during power-up.
The AD5628/AD5648/AD5668-1, -2 DAC output powers up to
0 V, and the AD5668-3 DAC output powers up to midscale. The
output remains powered up at this level until a valid write
sequence is made to the DAC. This is useful in applications
where it is important to know the state of the output of the DAC
while it is in the process of powering up. There is also a software
executable reset function that resets the DAC to the power-on
reset code. Command 0111 is reserved for this reset function
(see Table 8). Any events on LDAC or CLR during power-on
reset are ignored.
POWER-DOWN MODES
The AD5628/AD5648/AD5668 contain four separate modes
of operation. Command 0100 is reserved for the power-down
function (see Table 8). These modes are software-programmable
by setting two bits, Bit DB9 and Bit DB8, in the control register.
Table 12 shows how the state of the bits corresponds to the
mode of operation of the device. Any or all DACs (DAC H to
DAC A) can be powered down to the selected mode by setting
the corresponding eight bits (DB7 to DB0) to 1. See Table 13 for
the contents of the input shift register during power-down/powerup operation. When using the internal reference, only all channel
power-down to the selected modes is supported.
When both bits are set to 0, the part works normally with its
normal power consumption of 1.3 mA at 5 V. However, for the
three power-down modes, the supply current falls to 0.4 µA at
5 V (0.2 µA at 3 V). Not only does the supply current fall, but
the output stage is also internally switched from the output of
the amplifier to a resistor network of known values. This has the
advantage that the output impedance of the part is known while
the part is in power-down mode. There are three different
options. The output is connected internally to GND through
either a 1 kΩ or a 100 kΩ resistor, or it is left open-circuited
(three-state). The output stage is illustrated in Figure 61.
The bias generator of the selected DAC(s), output amplifier,
resistor string, and other associated linear circuitry are shut
down when the power-down mode is activated. The internal
reference is powered down only when all channels are powered
down. However, the contents of the DAC register are unaffected
when in power-down. The time to exit power-down is typically
4 µs for VDD = 5 V and for VDD = 3 V. See Figure 41 for a plot.
Any combination of DACs can be powered up by setting PD1
and PD0 to 0 (normal operation). The output powers up to the
value in the input register (LDAC low) or to the value in the
DAC register before powering down (LDAC high).
CLEAR CODE REGISTER
The AD5628/AD5648/AD5668 have a hardware CLR pin that
is an asynchronous clear input. The CLR input is falling edge
sensitive. Bringing the CLR line low clears the contents of the
input register and the DAC registers to the data contained in
the user-configurable CLR register and sets the analog outputs
accordingly. This function can be used in system calibration to load
zero scale, midscale, or full scale to all channels together. These
clear code values are user-programmable by setting two bits,
Bit DB1 and Bit DB0, in the CLR control register (see Table 14).
The default setting clears the outputs to 0 V. Command 0101 is
reserved for loading the clear code register (see Table 8).
The part exits clear code mode on the 32nd falling edge of the next
write to the part. If CLR is activated during a write sequence, the
write is aborted.
The CLR pulse activation time—the falling edge of CLR to
when the output starts to change—is typically 280 ns. However, if
outside the DAC linear region, it typically takes 520 ns after
executing CLR for the output to start changing (see Figure 51).
See Table 15 for contents of the input shift register during the
loading clear code register operation.
Rev. G | Page 24 of 32
Data Sheet
AD5628/AD5648/AD5668
Table 10. Internal Reference Register
Internal REF Register (DB0)
0
1
Action
Reference off (default)
Reference on
Table 11. 32-Bit Input Shift Register Contents for Reference Set-Up Command
MSB
DB31 to DB28
X
Don’t cares
DB27
DB26
DB25
DB24
1
0
0
0
Command bits (C3 to C0)
DB23
DB22
DB21
DB20
X
X
X
X
Address bits (A3 to A0)—don’t cares
DB19 to DB1
X
Don’t cares
LSB
DB0
1/0
Internal REF
register
Table 12. Power-Down Modes of Operation
DB9
0
DB8
0
0
1
1
1
0
1
Operating Mode
Normal operation
Power-down modes
1 kΩ to GND
100 kΩ to GND
Three-state
Table 13. 32-Bit Input Shift Register Contents for Power-Down/Power-Up Function
DB27
DB26
DB25
DB24
DB23
DB22
DB21
X
0
1
0
0
X
X
X
Don’t
cares
LSB
Command bits (C3 to C0)
DB20
DB19
to
DB10
DB9
DB8
DB7
X
X
PD1
PD0
Don’t
cares
Powerdown mode
DAC
DAC
DAC
DAC
DAC
DAC
DAC
DAC
H
G
F
E
D
C
B
A
Power-down/power-up channel selection—set bit to 1 to select
Address bits (A3 to A0)—
don’t cares
RESISTOR
STRING DAC
AMPLIFIER
POWER-DOWN
CIRCUITRY
DB6
DB5
DB4
DB3
DB2
DB1
DB0
VOUT
RESISTOR
NETWORK
05302-058
MSB
DB31
to
DB28
Figure 61. Output Stage During Power-Down
Table 14. Clear Code Register
DB1
CR1
0
0
1
1
Clear Code Register
DB0
CR0
0
1
0
1
Clears to Code
0x0000
0x8000
0xFFFF
No operation
Table 15. 32-Bit Input Shift Register Contents for Clear Code Function
MSB
DB31 to DB28
X
Don’t cares
DB27
DB26
DB25
DB24
0
1
0
1
Command bits (C3 to C0)
DB23
DB22
DB21
DB20
X
X
X
X
Address bits (A3 to A0)—don’t cares
Rev. G | Page 25 of 32
DB19 to DB2
X
Don’t cares
LSB
DB1
DB0
CR1
CR0
Clear code register
AD5628/AD5648/AD5668
Data Sheet
pin. See Table 17 for the contents of the input shift register
during the load LDAC register mode of operation.
LDAC FUNCTION
The outputs of all DACs can be updated simultaneously using
the hardware LDAC pin.
POWER SUPPLY BYPASSING AND GROUNDING
When accuracy is important in a circuit, it is helpful to carefully
consider the power supply and ground return layout on the board.
The printed circuit board containing the AD5628/AD5648/
AD5668 should have separate analog and digital sections. If the
AD5628/AD5648/AD5668 are in a system where other devices
require an AGND-to-DGND connection, the connection should
be made at one point only. This ground point should be as close
as possible to the AD5628/AD5648/AD5668.
Synchronous LDAC: After new data is read, the DAC registers
are updated on the falling edge of the 32nd SCLK pulse. LDAC
can be permanently low or pulsed as in Figure 2.
Asynchronous LDAC: The outputs are not updated at the same
time that the input registers are written to. When LDAC goes
low, the DAC registers are updated with the contents of the
input register.
The power supply to the AD5628/AD5648/AD5668 should be
bypassed with 10 µF and 0.1 µF capacitors. The capacitors
should physically be as close as possible to the device, with the
0.1 µF capacitor ideally right up against the device. The 10 µF
capacitors are the tantalum bead type. It is important that the
0.1 µF capacitor has low effective series resistance (ESR) and
low effective series inductance (ESI), such as is typical of
common ceramic types of capacitors. This 0.1 µF capacitor
provides a low impedance path to ground for high frequencies
caused by transient currents due to internal logic switching.
Alternatively, the outputs of all DACs can be updated simultaneously using the software LDAC function by writing to Input
Register n and updating all DAC registers. Command 0011 is
reserved for this software LDAC function.
An LDAC register gives the user extra flexibility and control
over the hardware LDAC pin. This register allows the user to
select which combination of channels to simultaneously update
when the hardware LDAC pin is executed. Setting the LDAC bit
register to 0 for a DAC channel means that this channel’s update
is controlled by the LDAC pin. If this bit is set to 1, this channel
updates synchronously; that is, the DAC register is updated
after new data is read, regardless of the state of the LDAC pin. It
effectively sees the LDAC pin as being tied low. (See Table 16
for the LDAC register mode of operation.) This flexibility is
useful in applications where the user wants to simultaneously
update select channels while the rest of the channels are
synchronously updating.
The power supply line should have as large a trace as possible to
provide a low impedance path and reduce glitch effects on the
supply line. Clocks and other fast switching digital signals should
be shielded from other parts of the board by digital ground. Avoid
crossover of digital and analog signals if possible. When traces
cross on opposite sides of the board, ensure that they run at right
angles to each other to reduce feedthrough effects through the
board. The best board layout technique is the microstrip technique,
where the component side of the board is dedicated to the ground
plane only and the signal traces are placed on the solder side.
However, this is not always possible with a 2-layer board.
Writing to the DAC using command 0110 loads the 8-bit LDAC
register (DB7 to DB0). The default for each channel is 0, that is,
the LDAC pin works normally. Setting the bits to 1 means the
DAC channel is updated regardless of the state of the LDAC
Table 16. LDAC Register
Load DAC Register
LDAC Bits (DB7 to DB0)
LDAC Pin
LDAC Operation
0
1
Determined by LDAC pin.
DAC channels update, overriding the LDAC pin. DAC channels see LDAC as 0.
1/0
X—don’t care
Table 17. 32-Bit Input Shift Register Contents for LDAC Register Function
MSB
DB31
to
DB28
X
Don’t
cares
LSB
DB27
0
DB26
1
DB25
1
DB24
0
Command bits (C3 to C0)
DB23
X
DB22
X
DB21
X
DB20
X
Address bits (A3 to A0)—
don’t cares
DB19
to
DB8
X
Don’t
cares
Rev. G | Page 26 of 32
DB7
DAC
H
DB6
DB5
DB4
DB3
DB2
DB1
DAC
DAC
DAC
DAC
DAC
DAC
G
F
E
D
C
B
Setting LDAC bit to 1 overrides LDAC pin
DB0
DAC
A
Data Sheet
AD5628/AD5648/AD5668
OUTLINE DIMENSIONS
5.10
5.00
4.90
14
8
4.50
4.40
4.30
6.40
BSC
1
7
PIN 1
0.65 BSC
1.20
MAX
0.15
0.05
COPLANARITY
0.10
0.20
0.09
SEATING
PLANE
0.30
0.19
8°
0°
0.75
0.60
0.45
061908-A
1.05
1.00
0.80
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 62. 14-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-14)
Dimensions shown in millimeters
5.10
5.00
4.90
16
9
4.50
4.40
4.30
6.40
BSC
1
8
PIN 1
1.20
MAX
0.15
0.05
0.20
0.09
0.65
BSC
0.30
0.19
COPLANARITY
0.10
SEATING
PLANE
8°
0°
0.75
0.60
0.45
COMPLIANT TO JEDEC STANDARDS MO-153-AB
Figure 63. 16-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-16)
Dimensions shown in millimeters
Rev. G | Page 27 of 32
AD5628/AD5648/AD5668
PIN 1
INDICATOR
Data Sheet
4.10
4.00 SQ
3.90
0.35
0.30
0.25
0.65
BSC
PIN 1
INDICATOR
16
13
12
1
EXPOSED
PAD
2.70
2.60 SQ
2.50
4
9
0.80
0.75
0.70
0.45
0.40
0.35
0.05 MAX
0.02 NOM
COPLANARITY
0.08
0.20 REF
SEATING
PLANE
0.20 MIN
BOTTOM VIEW
FOR PROPER CONNECTION OF
THE EXPOSED PAD, REFER TO
THE PIN CONFIGURATION AND
FUNCTION DESCRIPTIONS
SECTION OF THIS DATA SHEET.
08-16-2010-C
TOP VIEW
5
8
COMPLIANT TO JEDEC STANDARDS MO-220-WGGC.
Figure 64. 16-Lead Lead Frame Chip Scale Package [LFCSP_WQ]
4 mm × 4 mm Body, Very Very Thin Quad
(CP-16-17)
Dimensions shown in millimeters
2.645
2.605 SQ
2.565
4
3
2
1
A
BALL A1
IDENTIFIER
B
1.50
REF
C
D
0.50
REF
SEATING
PLANE
BOTTOM VIEW
(BALL SIDE UP)
SIDE VIEW
COPLANARITY
0.05
0.340
0.320
0.300
0.270
0.240
0.210
Figure 65. 16-Ball Wafer Level Chip Scale Package [WLCSP]
(CB-16-16)
Dimensions shown in millimeters
Rev. G | Page 28 of 32
10-23-2012-A
0.650
0.595
0.540
TOP VIEW
(BALL SIDE DOWN)
Data Sheet
AD5628/AD5648/AD5668
ORDERING GUIDE
Model 1
AD5628BRUZ-1
AD5628BRUZ-1REEL7
AD5628BRUZ-2
AD5628BRUZ-2REEL7
AD5628ARUZ-2
AD5628ARUZ-2REEL7
AD5628ACPZ-1-RL7
AD5628ACPZ-2-RL7
AD5628BCPZ-2-RL7
AD5628BCBZ-1-RL7
AD5648BRUZ-1
AD5648BRUZ-1REEL7
AD5648BRUZ-2
AD5648BRUZ-2REEL7
AD5648ARUZ-2
AD5648ARUZ-2REEL7
AD5668BRUZ-1
AD5668BRUZ-1REEL7
AD5668BRUZ-2
AD5668BRUZ-2REEL7
AD5668BRUZ-3
AD5668BRUZ-3REEL7
AD5668ARUZ-2
AD5668ARUZ-2REEL7
AD5668ARUZ-3
AD5668ARUZ-3REEL7
AD5668BCPZ-1-RL7
AD5668BCPZ-1500RL7
AD5668BCPZ-2-RL7
AD5668BCPZ-2500RL7
AD5668ACPZ-2-RL7
AD5668ACPZ-3-RL7
AD5668BCBZ-1-RL7
EVAL-AD5668SDCZ
EVAL-AD5668SDRZ
1
Temperature Range
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
Package Description
14-Lead TSSOP
14-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead WLCSP
14-Lead TSSOP
14-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead TSSOP
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead LFCSP_WQ
16-Lead WLCSP
LFCSP Evaluation Board
TSSOP Evaluation Board
Z = RoHS Compliant Part.
Rev. G | Page 29 of 32
Package
Option
RU-14
RU-14
RU-16
RU-16
RU-16
RU-16
CP-16-17
CP-16-17
CP-16-17
CB-16-16
RU-14
RU-14
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
RU-16
CP-16-17
CP-16-17
CP-16-17
CP-16-17
CP-16-17
CP-16-17
CB-16-16
Power-On
Reset to Code
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Zero
Midscale
Midscale
Zero
Zero
Midscale
Midscale
Zero
Zero
Zero
Zero
Zero
Midscale
Zero
Accuracy
±1 LSB INL
±1 LSB INL
±1 LSB INL
±1 LSB INL
±2 LSB INL
±2 LSB INL
±2 LSB INL
±2 LSB INL
±1 LSB INL
±1 LSB INL
±4 LSB INL
±4 LSB INL
±4 LSB INL
±4 LSB INL
±8 LSB INL
±8 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±32 LSB INL
±32 LSB INL
±32 LSB INL
±32 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±16 LSB INL
±32 LSB INL
±32 LSB INL
±16 LSB INL
Internal
Reference
1.25 V
1.25 V
2.5 V
2.5 V
2.5 V
2.5 V
1.25 V
2.5 V
2.5 V
1.25 V
1.25 V
1.25 V
2.5 V
2.5 V
2.5 V
2.5 V
1.25 V
1.25 V
2.5 V
2.5 V
2.5 V
2.5 V
2.5 V
2.5 V
2.5 V
2.5 V
1.25 V
1.25 V
2.5 V
2.5 V
2.5 V
2.5 V
1.25 V
AD5628/AD5648/AD5668
Data Sheet
NOTES
Rev. G | Page 30 of 32
Data Sheet
AD5628/AD5648/AD5668
NOTES
Rev. G | Page 31 of 32
AD5628/AD5648/AD5668
Data Sheet
NOTES
©2005–2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D05302-0-1/13(G)
Rev. G | Page 32 of 32

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