Features
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LTC2666
Octal 16-Bit/12-Bit ±10V
V
OUT
SoftSpan DACs with
10ppm/°C Max Reference
Description
The
LTC
®
2666
is a family of 8-channel, 16-/12-bit ±10V
digital-to-analog converters with integrated precision
references. They are guaranteed monotonic and have
built-in rail-to-rail output buffers. These SoftSpan™ DACs
offer five output ranges up to ±10V. The range of each
channel is independently programmable, or the part can
be hardware-configured for operation in a fixed range.
The integrated 2.5V reference is buffered separately to each
channel; an external reference can be used for additional
range options. The LTC2666 also includes A/B toggle
capability via a dedicated pin or software toggle command.
The SPI/Microwire-compatible 3-wire serial interface
operates on logic levels as low as 1.71V at clock rates
up to 50MHz.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
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Precision Reference 10ppm/°C Max
Independently Programmable Output Ranges:
0V to 5V, 0V to 10V, ±2.5V, ±5V, ±10V
Full 16-Bit/12-Bit Resolution at All Ranges
Maximum INL Error: ±4LSB at 16 Bits
A/B Toggle via Software or Dedicated Pin
8:1 Analog Multiplexer
Guaranteed Monotonic Over Temperature
Internal or External Reference
Outputs Drive ±10mA Guaranteed
1.8V to 5V SPI Serial interface
32-Lead (5mm × 5mm) QFN Package
applications
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Optical Networking
Instrumentation
Data Acquisition
Automatic Test Equipment
Process Control and Industrial Automation
Block Diagram
REFCOMP 26
OVRTMP
30
RGSTR A
GND
11, 29
REFLO
10, 27
V
OUT0
2
DAC 0
SPAN
SPAN
V
REF
REGISTER
RGSTR A
V
REF
REGISTER
INTERNAL REFERENCE
25 REF
28 V
CC
24
CLR
7
8
DAC 7
SPAN
SPAN
V
+
V
–
Integral Nonlinearity (LTC2666-16)
4
3
2
INL (LSB)
1
0
–1
–2
±10V RANGE
MUX
RGSTR B
RGSTR B
MUX
23 V
OUT7
• • •
• • •
V
OUT1
3
22 V
OUT6
• • •
• • •
• • •
• • •
• • •
• • •
RGSTR A
RGSTR A
V
OUT2
4
V
REF
REGISTER
V
REF
REGISTER
21 V
OUT5
–3
–4
0
16384
32768
CODE
49152
65535
2666 TA01b
MUX
RGSTR B
RGSTR B
MUX
V
OUT3
5
DAC 3
SPAN
SPAN
DAC 4
SPAN
SPAN
20 V
OUT4
12
LDAC
17 TGP
31 MSP0
CS/LD
13
SCK 14
SDI 16
SDO 15
MUXOUT 9
CONTROL LOGIC
DECODE
POWER-ON RESET
32-BIT SHIFT REGISTER
MONITOR MUX
32 MSP1
1
MSP2
TOGGLE SELECT REGISTER
18 IOV
CC
2666 TA01a
2666fa
For more information
www.linear.com/LTC2666
1
LTC2666
aBsolute maximum ratings
(Notes 1, 2)
pin conFiguration
TOP VIEW
REFCOMP
SDO
OVRTMP
REFLO
MSP1
MSP0
Analog Supply Voltage (V
CC
) ....................... –0.3V to 6V
Digital I/O Voltage (IOV
CC
) ........................... –0.3V to 6V
REFLO ....................................................... –0.3V to 0.3V
V
+
............................................................ –0.3V to 16.5V
V
–
.. ..........................................................–16.5V to 0.3V
CS/LD,
SCK, SDI,
LDAC, CLR,
TGP .............. –0.3V to 6V
MSP0, MSP1, MSP2 ........–0.3V to Min (V
CC
+ 0.3V, 6V)
V
OUT0
to V
OUT7
,
MUXOUT ............... V
–
– 0.3V to V
+
+ 0.3V (Max ±16.5V)
REF, REFCOMP ................–0.3V to Min (V
CC
+ 0.3V, 6V)
SDO ............................. –0.3V to Min (IOV
CC
+ 0.3V, 6V)
OVRTMP
....................................................... –0.3V to 6V
Operating Temperature Range
LTC2666C ................................................ 0°C to 70°C
LTC2666I .............................................–40°C to 85°C
LTC2666H .......................................... –40°C to 125°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range .................. –65°C to 150°C
GND
32 31 30 29 28 27 26 25
MSP2 1
V
OUT0
2
V
OUT1
3
V
OUT2
4
V
OUT3
5
DNC 6
V
+
REF
24
CLR
23 V
OUT7
22 V
OUT6
21 V
OUT5
20 V
OUT4
19 DNC
18 IOV
CC
17 TGP
SDI
33
7
8
9 10 11 12 13 14 15 16
REFLO
GND
LDAC
CS/LD
MUXOUT
SCK
V
–
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W
EXPOSED PAD IS V
–
, MUST BE SOLDERED TO PCB
V
CC
2
2666fa
For more information
www.linear.com/LTC2666
LTC2666
orDer inFormation
LTC2666
C
UH
16
#TR PBF
LEAD FREE DESIGNATOR
PBF = Lead Free
TAPE AND REEL
TR = 2500-Piece Tape and Reel
RESOLUTION
16 = 16-Bit
12 = 12-Bit
PACKAGE TYPE
UH = 32-Lead QFN
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
H = Automotive Temperature Range (–40°C to 125°C)
PRODUCT PART NUMBER
http://www.linear.com/product/LTC2666#orderinfo
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in
500 unit reels through designated sales channels with #TRMPBF suffix.
proDuct selection guiDe
LEAD FREE FINISH
LTC2666CUH-16#PBF
LTC2666IUH-16#PBF
LTC2666HUH-16#PBF
LTC2666CUH-12#PBF
LTC2666IUH-12#PBF
LTC2666HUH-12#PBF
TAPE AND REEL
LTC2666CUH-16#TRPBF
LTC2666IUH-16#TRPBF
LTC2666HUH-16#TRPBF
LTC2666CUH-12#TRPBF
LTC2666IUH-12#TRPBF
LTC2666HUH-12#TRPBF
PART MARKING
266616
266616
266616
266612
266612
266612
PACKAGE DESCRIPTION
32-Lead (5mm × 5mm) QFN
32-Lead (5mm × 5mm) QFN
32-Lead (5mm × 5mm) QFN
32-Lead (5mm × 5mm) QFN
32-Lead (5mm × 5mm) QFN
32-Lead (5mm × 5mm) QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
*Temperature grades are identified by a label on the shipping container.
2666fa
For more information
www.linear.com/LTC2666
3
LTC2666
electrical characteristics
LTC2666-16/LTC2666-12
LTC2666-12
SYMBOL
PARAMETER
Resolution
Monotonicity
DNL
INL
Differential Nonlinearity
Integral Nonlinearity
All Ranges (Note 3)
All Ranges (Note 3)
All Ranges (Note 3)
V
+
/V
–
= ±15V
V
–
= GND (Note 3)
C-Grade, I-Grade
H-Grade
0V to 5V Range
0V to 10V Range
All Unipolar Ranges
All Unipolar Ranges,
V
–
= GND
All Bipolar Ranges
All Bipolar Ranges
All Ranges, External Reference
V
CC
= 5V, ±10%
V
+
/V
–
= ±15V, ±5%
CONDITIONS
To V
–
(Unloaded, V
–
= GND)
To V
+
(Unloaded, V
+
= 5V)
To V
–
(–10mA ≤ I
OUT
≤ 10mA)
To V
+
(–10mA ≤ I
OUT
≤ 10mA)
–10mA ≤ I
OUT
≤ 10mA
(Note 4)
–10mA ≤ I
OUT
≤ 10mA
(Note 4)
Due to Full-Scale Output Change
Due to Load Current Change
Due to Powering Down (per Channel)
V
CC
= 5.5V, V
+
/V
–
= ±15.75V, V
REF
= 2.5V,
±10V Output Range
Code: Zero-Scale; Forcing Output to GND
Code: Full-Scale; Forcing Output to GND
Reference
Reference Output Voltage
Reference Temperature Coefficient
Reference Line Regulation
Reference Short-Circuit Current
REFCOMP Pin Short-Circuit Current
(Note 7)
V
CC
±10%
V
CC
= 5.5V, Forcing Output to GND
V
CC
= 5.5V, Forcing Output to GND
2.495
2.5
±2
50
2.5
65
2.505
±10
V
ppm/°C
µV/V
mA
µA
2666fa
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, IOV
CC
= 5V, V
+
= 15V, V
–
= –15V, V
REF
= 2.5V, V
OUT
unloaded
unless otherwise specified.
LTC2666-16
MIN
16
16
±0.05
±0.2
±0.2
±0.2
±1
±2
1
l
l
CONDITIONS
l
l
l
l
l
l
l
l
MIN
12
12
TYP
MAX
TYP
MAX
UNITS
Bits
Bits
DC Performance
±0.5
±1
±1
±1
±2
±4
5
±0.2
±2.2
±2.2
±2.2
±1
±2
1
2
±1
±4
±4
±5
±2
±4
5
LSB
LSB
LSB
LSB
mV
mV
ppm/°C
mV
%FSR
ppm/°C
%FSR
ppm/°C
LSB/V
LSB/V
V
OS
Unipolar Offset Error
V
OS
Temperature Coefficient
ZSE
BZE
GE
PSR
Single-Supply Zero-Scale Error
Bipolar Zero Error
BZE Temperature Coefficient
Gain Error
Gain Temperature Coefficient
Power Supply Rejection
All Ranges
2
±0.02 ±0.08
1
±0.02 ±0.08
2
0.1
0.001
MIN
TYP
±0.02 ±0.08
1
±0.02 ±0.08
2
1
0.01
MAX
l
SYMBOL PARAMETER
V
OUT
Output Voltage Swing
UNITS
V
V
V
V
µV/mA
Ω
µV
µV/mA
µV
V
–
+ 0.004
V
+
– 0.004
l
l
l
l
V
+
– 1.4
78
0.078
±1
±2
±4
V
–
+ 1.4
150
0.15
Load Regulation
R
OUT
DC Output Impedance
DC Crosstalk (Note 5)
0V to 5V Range
I
SC
V
+
/V
–
Short-Circuit Output Current
(Note 6)
l
l
16
–40
42
–14.5
mA
mA
4
For more information
www.linear.com/LTC2666
LTC2666
electrical characteristics
SYMBOL PARAMETER
Reference Load Regulation
Reference Output Voltage Noise
Density
Reference Input Range
Reference Input Current
Reference Input Capacitance (Note 9)
Power Supply
V
CC
V
+
V
–
IOV
CC
I(V
CC
)
I
S
I(IOV
CC
)
Analog Supply Voltage
Analog Positive Supply
Analog Negative Supply
Digital I/O Supply Voltage
Supply Current V
CC
Supply Current V
+
/V
–
Supply Current IOV
CC
(Note 12)
V
CC
Shutdown Supply Current
V
+
Shutdown Supply Current
V
–
Shutdown Supply Current
Analog Mux
Analog Mux DC Output Impedance
Analog Mux Leakage Current
Analog Mux Output Voltage Range
Analog Mux Continuous Current
(Note 9)
Temperature Monitor
Initial Voltage
Temperature Coefficient
AC Performance
t
SET
Settling Time (Notes 9, 13)
0V to 5V or ±2.5V Span, ±5V Step
Settling Time (Notes 9, 13)
0V to 10V or ±5V Span, ±10V Step
Settling Time (Notes 9, 13)
±10V Span, ±20V Step
SR
Voltage Output Slew Rate
Capacitive Load Driving
Glitch Impulse (Note 14)
DAC-to-DAC Crosstalk (Note 15)
No Oscillation
At Mid-Scale Transition, 0V to 5V Range
Due to Full-Scale Output Change
±0.024% (±1LSB at 12 Bits)
±0.0015% (±1LSB at 16 Bits)
±0.024% (±1LSB at 12 Bits)
±0.0015% (±1LSB at 16 Bits)
±0.024% (±1LSB at 12 Bits)
±0.0015% (±1LSB at 16 Bits)
4.5
9
8
9.5
15.5
20
5
1000
7
3.5
µs
µs
µs
µs
µs
µs
V/µs
pF
nV
•
s
nV
•
s
T = 25°C
1.4
–3.7
V
mV/°C
Analog Mux Disabled (High Impedance)
Analog Mux Selected to DAC Channel
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, IOV
CC
= 5V, V
+
= 15V, V
–
= –15V, V
REF
= 2.5V, V
OUT
unloaded
unless otherwise specified.
CONDITIONS
V
CC
= 5V ± 10%, I
OUT
= 100µA Sourcing
C
REFCOMP
= C
REF
= 0.1µF, at f = 10kHz
External Reference Mode (Note 8)
External Reference
l
l
l
MIN
TYP
140
32
MAX
UNITS
mV/mA
nV/√Hz
0.5
0.001
40
4.5
4.5
–15.75
1.71
2.8
4.8
2.3
4
0.02
1
35
–60
–27
2.2
0.02
V
–
0
V
CC
– 1.75
1
V
µA
pF
5.5
15.75
–4.5
V
CC
+ 0.3
3.8
6.5
3.2
5.5
1
3
70
V
V
V
V
V
mA
mA
mA
mA
µA
µA
µA
µA
kΩ
V
–
Not Tied to GND
V
–
Tied to GND
V
CC
= 5V, Unipolar Ranges (Note 10)
V
CC
= 5V, Bipolar Ranges (Note 10)
Unipolar Ranges (Code = 0)
Bipolar Ranges (Note 11)
IOV
CC
= 5V
IOV
CC
= V
CC
= 5V, V
+
/V
–
= ±15V
IOV
CC
= V
CC
= 5V, V
+
/V
–
= ±15V
IOV
CC
= V
CC
= 5V, V
+
/V
–
= ±15V
l
l
l
l
l
l
l
l
l
l
1
V
+
– 1.4
±1
µA
V
mA
2666fa
For more information
www.linear.com/LTC2666
5
嵌入式系统
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