LTC2656
Octal 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
FEATURES
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DESCRIPTION
The LTC
®
2656 is a family of octal 16-/12-bit rail-to-rail
DACs with a precision integrated reference. The DACs have
built-in high performance, rail-to-rail, output buffers and
are guaranteed monotonic.The LTC2656-L has a full-scale
output of 2.5V with the integrated 10ppm/°C reference and
operates from a single 2.7V to 5.5V supply. The LTC2656-H
has a full-scale output of 4.096V with the integrated refer-
ence and operates from a 4.5V to 5.5V supply. Each DAC can
also operate with an external reference, which sets the DAC
full-scale output to two times the external reference voltage.
These DACs communicate via a SPI/MICROWIRE™ com-
patible 4-wire serial interface which operates at clock rates
up to 50MHz. The LTC2656 incorporates a power-on reset
circuit that is controlled by the PORSEL pin. If PORSEL
is tied to GND the DACs reset to zero-scale. If PORSEL is
tied to V
CC
, the DACs reset to mid-scale.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5396245, 6891433.
Precision 10ppm/°C Max Reference
Maximum INL Error: ±4LSB at 16 Bits
Guaranteed Monotonic over Temperature
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2656-L)
Integrated Reference Buffers
Ultralow Crosstalk Between DACs(<1nV•s)
Power-On-Reset to Zero-Scale/Mid-scale
Asynchronous LDAC Update Pin
Tiny 20-Lead 4mm
×
5mm QFN and 20-Lead
Thermally Enhanced TSSOP Packages
APPLICATIONS
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Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
Automotive
BLOCK DIAGRAM
REFCOMP
GND
REGISTER
REGISTER
REGISTER
REGISTER
REFLO
V
OUTA
DAC A
REF
V
CC
DAC H
REF
4
REGISTER
REGISTER
REGISTER
REGISTER
3
DAC G
REF
V
OUTG
INL (LSB)
2
1
0
–1
DAC F
REF
V
OUTF
–2
–3
–4
128
DAC E
V
OUTE
16384
DAC A
DAC B
DAC C
DAC D
32768
CODE
2656 TA01
REF
INTERNAL REFERENCE
REF
REFIN/OUT
V
OUTH
INL vs Code
V
OUTB
DAC B
REF
REGISTER
REGISTER
REGISTER
V
OUTC
DAC C
REF
REGISTER
DAC E
DAC F
DAC G
DAC H
49152
65535
REGISTER
REGISTER
REGISTER
V
OUTD
DAC D
REGISTER
CS/LD
CONTROL LOGIC
SCK
LDAC
32-BIT SHIFT REGISTER
DECODE
POWER-ON RESET
PORSEL
SDO
SDI
CLR
2656 BD
2656f
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LTC2656
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) ................................... –0.3V to 6V
CS/LD,
SCK, SDI,
LDAC, CLR,
REFLO .......... –0.3V to 6V
V
OUTA
to V
OUTH
................. –0.3V to Min(V
CC
+ 0.3V, 6V)
REFIN/OUT, REFCOMP ...... –0.3V to Min(V
CC
+ 0.3V, 6V)
PORSEL, SDO ................... –0.3V to Min(V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2656C ................................................ 0°C to 70°C
LTC2656I.............................................. –40°C to 85°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range....................... –65 to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package ....................................................... 300°C
PIN CONFIGURATION
REFLO
TOP VIEW
REFLO
V
OUTA
V
OUTB
REFCOMP
V
OUTC
V
OUTD
REFIN/OUT
LDAC
CS/LD
1
2
3
4
5
6
7
8
9
21
20 GND
19 V
CC
18 V
OUTH
17 V
OUTG
16 V
OUTF
15 V
OUTE
14 PORSEL
13
CLR
12 SDO
11 SDI
V
OUTB
1
REFCOMP 2
V
OUTC
3
V
OUTD
4
REFIN/OUT 5
LDAC
6
7
CS/LD
8
SCK
9 10
SDI
SDO
21
TOP VIEW
V
OUTA
GND
V
CC
16 V
OUTH
15 V
OUTG
14 V
OUTF
13 V
OUTE
12 PORSEL
11
CLR
20 19 18 17
SCK 10
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 38°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UFD PACKAGE
20-LEAD (4mm 5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
2656f
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LTC2656
PRODUCT SELECTOR GUIDE
LTC2656 B
C
UFD -L
16
#TR PBF
LEAD FREE DESIGNATOR
PBF = Lead Free
TAPE AND REEL
TR = Tape and Reel
RESOLUTION
16 = 16-Bit
12 = 12-Bit
FULL-SCALE VOLTAGE, INTERNAL REFERENCE MODE
L = 2.5V
H = 4.096V
PACKAGE TYPE
UFD = 20-Lead (4mm
×
5mm) Plastic QFN
FE = 20-Lead Thermally Enhanced TSSOP
TEMPERATURE GRADE
C = Commercial Temperature Range (0°C to 70°C)
I = Industrial Temperature Range (–40°C to 85°C)
ELECTRICAL GRADE (OPTIONAL)
B = ±4LSB Maximum INL (16-Bit)
PRODUCT PART NUMBER
Consult LTC Marketing for information on non-standard 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/
2656f
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LTC2656
ORDER INFORMATION
LEAD FREE FINISH
LTC2656BCFE-L16#PBF
LTC2656BIFE-L16#PBF
TAPE AND REEL
LTC2656BCFE-L16#TRPBF
LTC2656BIFE-L16#TRPBF
PART
MARKING*
PACKAGE DESCRIPTION
TEMPERATURE
RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
MAXIMUM INL
±4
±4
±4
±4
±4
±4
±4
±4
±1
±1
±1
±1
±1
±1
±1
±1
LTC2656FE-L16 20-Lead Thermally Enhanced TSSOP
LTC2656FE-L16 20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
LTC2656BCUFD-L16#PBF LTC2656BCUFD-L16#TRPBF 56L16
LTC2656BIUFD-L16#PBF LTC2656BIUFD-L16#TRPBF 56L16
LTC2656BCFE-H16#PBF
LTC2656BIFE-H16#PBF
LTC2656BCFE-H16#TRPBF
LTC2656BIFE-H16#TRPBF
LTC2656FE-H16 20-Lead Thermally Enhanced TSSOP
LTC2656FE-H16 20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
LTC2656BCUFD-H16#PBF LTC2656BCUFD-H16#TRPBF 56H16
LTC2656BIUFD-H16#PBF LTC2656BIUFD-H16#TRPBF 56H16
LTC2656CFE-L12#PBF
LTC2656IFE-L12#PBF
LTC2656CUFD-L12#PBF
LTC2656IUFD-L12#PBF
LTC2656CFE-H12#PBF
LTC2656IFE-H12#PBF
LTC2656CUFD-H12#PBF
LTC2656IUFD-H12#PBF
LTC2656CFE-L12#TRPBF
LTC2656IFE-L12#TRPBF
LTC2656CUFD-L12#TRPBF
LTC2656IUFD-L12#TRPBF
LTC2656CFE-H12#TRPBF
LTC2656IFE-H12#TRPBF
LTC2656CUFD-H12#TRPBF
LTC2656IUFD-H12#TRPBF
LTC2656FE-L12 20-Lead Thermally Enhanced TSSOP
LTC2656FE-L12 20-Lead Thermally Enhanced TSSOP
56L12
56L12
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
LTC2656FE-H12 20-Lead Thermally Enhanced TSSOP
LTC2656FE-H12 20-Lead Thermally Enhanced TSSOP
56H12
56H12
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on
the shipping container. Consult LTC Marketing for information on non-standard 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/
2656f
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LTC2656
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
Differential Nonlinearity
Integral Nonlinearity (Note 3)
Load Regulation
(Note 3)
(Note 3)
V
CC
= 5.5V, V
REF
= 2.5V
V
CC
= 5V ±10%, Internal Reference, Mid-Scale,
–15mA ≤ I
OUT
≤ 15mA
V
CC
= 3V ±10%, Internal Reference, Mid-Scale,
–7.5mA ≤ I
OUT
≤ 7.5mA
ZSE
V
OS
GE
Zero-Scale Error
Offset Error
V
OS
Temperature Coefficient
Gain Error
Gain Temperature Coefficient
SYMBOL PARAMETER
V
OUT
PSR
R
OUT
DAC Output Span
Power Supply Rejection
DC Output Impedance
CONDITIONS
Internal Reference
External Reference = V
EXTREF
V
CC
±10%
V
CC
= 5V ±10%, Internal Reference, Mid-Scale,
–15mA ≤ I
OUT
≤ 15mA
V
CC
= 3V ±10%, Internal Reference, Mid-Scale,
–7.5mA ≤ I
OUT
≤ 7.5mA
DC Crosstalk (Note 5)
Due to Full-Scale Output Change
Due to Load Current Change
Due to Powering Down (per Channel)
V
CC
= 5.5V, V
EXTREF
= 2.75V
Code: Zero Scale, Forcing Output to V
CC
Code: Full Scale, Forcing Output to GND
V
CC
= 2.7V, V
EXTREF
= 1.35V
Code: Zero Scale, Forcing Output to V
CC
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
Reference Load Regulation
C-Grade (Note 7)
I-Grade (Note 7)
V
CC
±10%
V
CC
= 5.5V, Forcing Output to GND
V
CC
= 5.5V, Forcing Output to GND
V
CC
= 3V ±10% or 5V ±10%, I
OUT
= 100μA
Sourcing
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specified.
LTC2656B-L16/LTC2656-L12 (internal reference = 1.25V)
CONDITIONS
LTC2656-12
MIN TYP MAX
12
12
±0.1
±0.5
±0.5
±1
LTC2656B-16
MIN TYP MAX
16
16
±0.3
±2
0.6
1
1
±1
2
±0.02 ±0.1
1
TYP
0 to 2.5
0 to 2 • V
EXTREF
–80
0.04
0.04
±1.5
±2
±1
20
20
10
10
1.248
1.25
±2
±2
–80
3
60
40
30
5
200
65
65
40
40
1.252
±10
0.15
0.15
MAX
±1
±4
2
4
3
±2
UNITS
Bits
Bits
LSB
LSB
LSB/mA
LSB/mA
mV
mV
μV/°C
%FSR
ppm/°C
UNITS
V
V
dB
Ω
Ω
μV
μV/mA
μV
mA
mA
mA
mA
V
ppm/°C
ppm/°C
dB
mA
μA
mV/mA
nV/√Hz
0.04 0.125
0.06
1
±1
2
±0.02 ±0.1
1
MIN
0.25
3
±2
V
REF
= 1.25V (Note 4)
l
I
SC
Short-Circuit Output Current (Note 6)
Reference Output Voltage Noise Density C
REFCOMP
= C
REFIN/OUT
= 0.1μF at f = 1kHz
2656f
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