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AD5666 Datasheet PDF Download - Analog Devices

Номер произв AD5666
Описание 16-Bit DAC
Производители Analog Devices
логотип Analog Devices логотип 
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AD5666 Даташит, Описание, Даташиты
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Quad, 16-Bit DAC with 5 ppm/°C
On-Chip Reference in 14-Lead TSSOP
AD5666
FEATURES
Low power quad 16-bit DAC
14-lead TSSOP
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 with LDAC override function
CLR function to programmable code
SDO daisy-chaining option
Rail-to-rail operation
APPLICATIONS
Process control
Data acquisition systems
Portable battery-powered instruments
Digital gain and offset adjustment
Programmable voltage and current sources
Programmable attenuators
FUNCTIONAL BLOCK DIAGRAM
AD5666
LDAC
SCLK
SYNC
INTERFACE
LOGIC
DIN
SDO
VDD
VREFIN/VREFOUT
INPUT
REGISTER
DAC
REGISTER
INPUT
REGISTER
DAC
REGISTER
INPUT
REGISTER
DAC
REGISTER
INPUT
REGISTER
POWER-ON
RESET
DAC
REGISTER
1.25V/2.5V
REF
STRING
DAC A
BUFFER
STRING
DAC B
BUFFER
STRING
DAC C
BUFFER
STRING
DAC D
BUFFER
POWER-DOWN
LOGIC
LDAC CLR
POR
Figure 1.
GND
VOUTA
VOUTB
VOUTC
VOUTD
GENERAL DESCRIPTION
The AD5666 is a low power, quad, 16-bit, buffered voltage-
output DAC. The part operates from a single 2.7 V to 5.5 V
supply and is guaranteed monotonic by design.
The AD5666 has an on-chip reference with an internal gain of 2.
The AD5666-1 has a 1.25 V 5 ppm/°C reference, giving a full-scale
output of 2.5 V; the AD5666-2 has 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 turned on by writing to the DAC.
The part incorporates a power-on reset circuit that ensures that
the DAC output powers up to 0 V (POR pin low) or to midscale
(POR pin high) 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 software-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-select-
able DAC channels to simultaneously update. There is also an
asynchronous CLR that clears all DACs to a software-selectable
code—0 V, midscale, or full scale.
The AD5666 utilizes 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. Quad, 16-bit DAC.
2. On-chip 1.25 V/2.5 V, 5 ppm/°C reference.
3. Available in 14-lead TSSOP.
4. Selectable power-on reset to 0 V or midscale.
5. Power-down capability. When powered down, the DAC
typically consumes 200 nA at 3 V and 400 nA at 5 V.
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.
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
© 2005 Analog Devices, Inc. All rights reserved.
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AD5666 Даташит, Описание, Даташиты
AD5666
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AC Characteristics........................................................................ 7
Timing Characteristics ................................................................ 8
Absolute Maximum Ratings.......................................................... 10
ESD Caution................................................................................ 10
Pin Configuration and Function Descriptions........................... 11
Typical Performance Characteristics ........................................... 12
Terminology .................................................................................... 18
Theory of Operation ...................................................................... 20
D/A Section................................................................................. 20
REVISION HISTORY
11/05—Rev. 0 to Rev. A
Change to General Description ...................................................... 1
Change to Specifications.................................................................. 3
10/05—Revision 0: Initial Version
Resistor String............................................................................. 20
Internal Reference ...................................................................... 20
Output Amplifier........................................................................ 21
Serial Interface ............................................................................ 21
Input Shift Register .................................................................... 22
SYNC Interrupt .......................................................................... 22
Daisy-Chaining........................................................................... 23
Internal Reference Register....................................................... 23
Power-On Reset.......................................................................... 23
Power-Down Modes .................................................................. 23
Clear Code Register ................................................................... 25
LDAC Function .......................................................................... 25
Power Supply Bypassing and Grounding................................ 25
Outline Dimensions ....................................................................... 27
Ordering Guide .......................................................................... 27
Rev. A | Page 2 of 28
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AD5666 Даташит, Описание, Даташиты
AD5666
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 PERFORMANCE2
Resolution
Relative Accuracy
Differential Nonlinearity
Zero-Code Error
Zero-Code Error Drift
Full-Scale Error
Gain Error
Gain Temperature Coefficient
Offset Error
DC Power Supply Rejection
Ratio
DC Crosstalk
(External Reference)
DC Crosstalk
(Internal Reference)
OUTPUT CHARACTERISTICS3
Output Voltage Range
Capacitive Load Stability
DC Output Impedance
Short-Circuit Current
Power-Up Time
REFERENCE INPUTS
Reference Input Voltage
Reference Current
Reference Input Range
Reference Input Impedance
REFERENCE OUTPUT
Output Voltage
Reference TC3
Reference Output
Impedance
LOGIC INPUTS3
Input Current
Input Low Voltage, VINL
Input High Voltage, VINH
Pin Capacitance
A Grade1
Min Typ Max
16
±32
±1
19
±2
−0.2 −1
±1
±2.5
±1 ±9
–80
10
5
10
25
10
0 VDD
2
10
0.5
30
4
VDD
20 30
0 VDD
14.6
2.495
±5
7.5
2.505
±10
±3
0.8
2
3
B Grade1
Min Typ Max
16
±16
±1
19
±2
−0.2 −1
±1
±2.5
±1 ±9
–80
10
5
10
25
10
0 VDD
2
10
0.5
30
4
VDD
20 30
0 VDD
14.6
2.495
±5
7.5
2.505
±10
±3
0.8
2
3
Unit
Bits
LSB
LSB
mV
μV/°C
% FSR
% FSR
ppm
mV
dB
μV
μV/mA
μV
μV
μV/mA
V
nF
nF
Ω
mA
μs
V
μA
V
V
ppm/°C
μA
V
V
pF
Conditions/Comments
See Figure 6
Guaranteed monotonic by design
(see Figure 7)
All 0s loaded to DAC register (see Figure 13)
All 1s loaded to DAC register (see Figure 12)
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
RL = ∞
RL = 2 kΩ
VDD = 5 V
Coming out of power-down mode VDD = 5 V
VREF = VDD = 5.5 V
Per DAC channel
At ambient
All digital inputs
VDD = 5 V
VDD = 5 V
Rev. A | Page 3 of 28
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