FEATURES
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LTC2657
Octal I
2
C 16-/12-Bit
Rail-to-Rail DACs with
10ppm/°C Max Reference
DESCRIPTION
The LTC
®
2657 is a family of octal I
2
C 16-/12-Bit Rail-to-
Rail DACs with Integrated 10ppm/°C Max Reference. The
DACs have built-in high performance, rail-to-rail, output
buffers and are guaranteed monotonic. The LTC2657-L has
a full-scale output of 2.5V with the integrated reference and
operates from a single 2.7V to 5.5V supply. The LTC2657-H
has a full-scale output of 4.096V with the integrated reference
and operates from a 4.5V to 5.5V supply. Each DAC can also
operate with an external reference, which sets the full-scale
output to 2 times the external reference voltage.
The parts use a 2-wire I
2
C compatible serial interface. The
LTC2657 operates in both the standard mode (maximum
clock rate of 100kHz) and the fast mode (maximum clock
rate of 400kHz). The LTC2657 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 at power-up. If PORSEL
is tied to V
CC
, the DACs reset to mid-scale at power-up.
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 and patent pending.
Integrated Reference 10ppm/°C Max
Maximum INL Error: ±4LSB
Guaranteed Monotonic Over Temperature
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2657-L)
Integrated Reference Buffers
Ultralow Crosstalk between DACs(0.8nV•s)
Power-On-Reset to Zero-Scale/Mid-Scale
400kHz I
2
C Interface
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
V
CC
REF
INTERNAL REFERENCE
REFIN/OUT
INL vs Code (LTC2657-16)
4
DAC H
V
OUTH
3
2
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTB
DAC B
DAC G
V
OUTG
INL (LSB)
1
0
–1
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTC
DAC C
DAC F
V
OUTF
–2
–3
DAC A
DAC B
DAC C
DAC D
16384
32768
CODE
49152
DAC E
DAC F
DAC G
DAC H
65535
2657 TA01
REGISTER
REGISTER
REGISTER
V
OUTD
CA0
CA1
CA2
LDAC
REGISTER
DAC D
DAC E
POWER-ON RESET
V
OUTE
PORSEL
–4
128
32-BIT SHIFT REGISTER
2-WIRE INTERFACE
SDA
SCL
2657 BD
2657f
1
LTC2657
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (V
CC
) ................................... –0.3V to 6V
SCL, SDA,
LDAC,
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, CA0, CA1, CA2 ... –0.3V to Min(V
CC
+ 0.3V, 6V)
Operating Temperature Range
LTC2657C ................................................ 0°C to 70°C
LTC2657I..............................................–40°C to 85°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range.......................–65 to 150°C
Lead Temperature (Soldering FE-Package, 10 sec) .. 300°C
PIN CONFIGURATION
REFLO
V
OUTA
TOP VIEW
REFLO
V
OUTA
V
OUTB
REFCOMP
V
OUTC
V
OUTD
REFIN/OUT
LDAC
CA2
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 CA0
12 CA1
11 SDA
V
OUTB
1
REFCOMP 2
V
OUTC
3
V
OUTD
4
REFIN/OUT 5
LDAC
6
7
CA2
8
SCL
9 10
SDA
CA1
21
TOP VIEW
GND
V
CC
16 V
OUTH
15 V
OUTG
14 V
OUTF
13 V
OUTE
12 PORSEL
11 CA0
20 19 18 17
SCL 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
2657f
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LTC2657
PRODUCT SELECTOR GUIDE
LTC2657 B
C
UFD -L
16
#TR
PBF
LEAD FREE DESIGNATOR
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 INL (MAX)
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/
2657f
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LTC2657
ORDER INFORMATION
LEAD FREE FINISH
LTC2657BCFE-L16#PBF
LTC2657BIFE-L16#PBF
LTC2657BCUFD-L16#PBF
LTC2657BIUFD-L16#PBF
LTC2657BCFE-H16#PBF
LTC2657BIFE-H16#PBF
LTC2657BCUFD-H16#PBF
LTC2657BIUFD-H16#PBF
LTC2657CFE-L12#PBF
LTC2657IFE-L12#PBF
LTC2657CUFD-L12#PBF
LTC2657IUFD-L12#PBF
LTC2657CFE-H12#PBF
LTC2657IFE-H12#PBF
LTC2657CUFD-H12#PBF
LTC2657IUFD-H12#PBF
TAPE AND REEL
LTC2657BCFE-L16#TRPBF
LTC2657BIFE-L16#TRPBF
LTC2657BIUFD-L16#TRPBF
LTC2657BCFE-H16#TRPBF
LTC2657BIFE-H16#TRPBF
LTC2657BIUFD-H16#TRPBF
LTC2657CFE-L12#TRPBF
LTC2657IFE-L12#TRPBF
LTC2657CUFD-L12#TRPBF
LTC2657IUFD-L12#TRPBF
LTC2657CFE-H12#TRPBF
LTC2657IFE-H12#TRPBF
LTC2657CUFD-H12#TRPBF
LTC2657IUFD-H12#TRPBF
PART MARKING* PACKAGE DESCRIPTION
LTC2657FE-L16
LTC2657FE-L16
57L16
LTC2657FE-H16
LTC2657FE-H16
57H16
LTC2657FE-L12
LTC2657FE-L12
57L12
57L12
LTC2657FE-H12
LTC2657FE-H12
57H12
57H12
20-Lead Thermally Enhanced TSSOP
20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead Thermally Enhanced TSSOP
20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead Thermally Enhanced TSSOP
20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead Thermally Enhanced TSSOP
20-Lead Thermally Enhanced TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
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
LTC2657BCUFD-L16#TRPBF 57L16
LTC2657BCUFD-H16#TRPBF 57H16
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/
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.
LTC2657B-L16/LTC2657-L12 (Internal Reference = 1.25V)
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
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ELECTRICAL CHARACTERISTICS
CONDITIONS
LTC2657-12
MIN TYP MAX
12
12
±0.1
±0.5
±0.5
±1
LTC2657B-16
MIN TYP MAX
16
16
±0.3
±2
0.6
1
1
±1
2
±0.02 ±0.1
1
±1
±4
2
4
3
±2
UNITS
Bits
Bits
LSB
LSB
LSB/mA
LSB/mA
mV
mV
μV/°C
%FSR
ppm/°C
0.04 0.125
0.06
1
±1
2
±0.02 ±0.1
1
0.25
3
±2
(Note 4) V
REF
= 1.25V
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2657f
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LTC2657
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
V
OUT
PSR
R
OUT
DAC Output Span
Power Supply Rejection
DC Output Impedance
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.
LTC2657B-L16/LTC2657-L12 (Internal Reference = 1.25V)
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
= 2.8V
Code: Zero-Scale, Forcing Output to V
CC
Code: Full-Scale, Forcing Output to GND
V
CC
= 2.7V, V
EXTREF
= 1.4V
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
(Note 7) C-Grade Only
V
CC
±10%
V
CC
= 5.5V, Forcing REFIN/OUT to GND
V
CC
= 5.5V, Forcing REFCOMP to GND
V
CC
= 3V ±10% or 5V ±10%, I
OUT
= 100μA
Sourcing
External Reference Mode (Note 14)
(Note 9)
For Specified Performance
V
CC
= 5V, Internal Reference On
V
CC
= 5V, Internal Reference Off
V
CC
= 3V, Internal Reference On
V
CC
= 3V, Internal Reference Off
V
CC
= 5V
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MIN
TYP
0 to 2.5
0 to 2 • V
EXTREF
–80
0.04
0.04
±1.5
±2
±1
MAX
UNITS
V
V
dB
0.15
0.15
Ω
Ω
μV
μV/mA
μV
I
SC
Short-Circuit Output Current (Note 6)
20
20
10
10
1.248
1.25
±2
–80
65
65
40
40
1.252
±10
5
200
40
30
mA
mA
mA
mA
V
ppm/°C
dB
mA
μA
mV/mA
nV/√Hz
Reference Output Voltage Noise Density C
REFCOMP
= C
REFIN/OUT
= 0.1μF at f = 1kHz
Reference Input Range
Reference Input Current
Reference Input Capacitance
Power Supply
V
CC
I
CC
Positive Supply Voltage
Supply Current (Note 8)
2.7
0.5
V
CC
/2
0.001
40
5.5
3.1
2.7
3
2.6
4.25
3.7
3.8
3.2
3
1
V
μA
pF
V
mA
mA
mA
mA
μA
I
SD
Digital I/O
V
IL
V
IH
Supply Current in Shutdown Mode
(Note 8)
Low Level Input Voltage
(SDA and SCL)
High Level Input Voltage
(SDA and SCL)
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0.3V
CC
0.7V
CC
0.8
0.6
2.4
2
V
V
V
V
V
V
2657f
V
IL(LDAC)
Low Level Input Voltage (LDAC)
V
IH(LDAC)
High Level Input Voltage (LDAC)
V
CC
= 4.5V to 5.5V
V
CC
= 2.7V to 4.5V
V
CC
= 3.6V to 5.5V
V
CC
= 2.7V to 3.6V
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