LTC2656
Octal 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
Features
n
n
n
n
n
n
n
n
n
n
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, LTM, Linear Technology and the Linear logo 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: ±4 LSB 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
n
n
n
n
n
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
REF
INTERNAL REFERENCE
REF
V
CC
DAC H
REF
V
OUTH
4
3
DAC G
REF
V
OUTG
INL (LSB)
2
1
0
–1
–2
–3
–4
128
DAC E
POWER-ON RESET
CONTROL LOGIC
SCK
LDAC
32-BIT SHIFT REGISTER
DECODE
V
OUTE
PORSEL
SDO
SDI
CLR
2656 TA01a
REFIN/OUT
INL vs Code
REGISTER
REGISTER
REGISTER
V
OUTB
DAC B
REF
REGISTER
REGISTER
REGISTER
V
OUTC
DAC C
REF
REGISTER
REGISTER
DAC F
REF
V
OUTF
DAC A
DAC B
DAC C
DAC D
16384
32768
CODE
49152
DAC E
DAC F
DAC G
DAC H
65535
2656 TA01b
REGISTER
REGISTER
REGISTER
V
OUTD
DAC D
CS/LD
REGISTER
2656fa
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
SDO
SDI
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
T
JMAX
= 150°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UFD PACKAGE
20-LEAD (4mm 5mm) PLASTIC QFN
2656fa
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 = ±4 LSB Maximum INL (16-Bit)
C = ±12 LSB
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/
2656fa
LTC2656
order inFormation
LEAD FREE FINISH
LTC2656BCFE-L16#PBF
LTC2656BIFE-L16#PBF
LTC2656BCUFD-L16#PBF
LTC2656BIUFD-L16#PBF
LTC2656BCFE-H16#PBF
LTC2656BIFE-H16#PBF
LTC2656BCUFD-H16#PBF
LTC2656BIUFD-H16#PBF
LTC2656CCEFE-L16#PBF
LTC2656CIFE-L16#PBF
LTC2656CCUFD-L16#PBF
LTC2656CIUF-L16#PBF
LTC2656CFE-L12#PBF
LTC2656IFE-L12#PBF
LTC2656CUFD-L12#PBF
LTC2656IUFD-L12#PBF
LTC2656CFE-H12#PBF
LTC2656IFE-H12#PBF
LTC2656CUFD-H12#PBF
LTC2656IUFD-H12#PBF
TAPE AND REEL
LTC2656BCFE-L16#TRPBF
LTC2656BIFE-L16#TRPBF
PART MARKING* PACKAGE DESCRIPTION
LTC2656FE-L16
LTC2656FE-L16
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
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
±4
±4
±4
±4
±1
±1
±1
±1
±1
±1
±1
±1
LTC2656BCUFD-L16#TRPBF 56L16
LTC2656BIUFD-L16#TRPBF
56L16
LTC2656BCFE-H16#TRPBF
LTC2656BIFE-H16#TRPBF
LTC2656FE-H16
LTC2656FE-H16
LTC2656BCUFD-H16#TRPBF 56H16
LTC2656BIUFD-H16#TRPBF 56H16
LTC2656CCFE-L16#TRPBF
LTC2656CIFE-L1616#TRPBF
LTC2656CFE-L16 20-Lead Thermally Enhanced TSSOP
LTC2656CFE-L16 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
LTC2656CCUFD-L16#TRPBF 6CL16
LTC2656CIUFD-L16#TRPBF
6CL16
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
LTC2656FE-L12
56L12
56L12
LTC2656FE-H12
LTC2656FE-H12
56H12
56H12
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/
2656fa
LTC2656
electrical characteristics
SYMBOL PARAMETER
DC Performance
Resolution
Monotonicity
DNL
INL
Differential Nonlinearity
Integral Nonlinearity (Note 3)
Load Regulation
(Note 3)
(Note 3)
LTC2656B-L16: V
CC
= 5.5V, V
REF
= 2.5V
LTC2656C-L16: V
CC
= 5.5V, V
REF
= 2.5V
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
= 2.7V to 5.5V, V
OUT
unloaded unless otherwise specified.
LTC2656B/C-L16/LTC2656-L12 (internal reference = 1.25V)
CONDITIONS
LTC2656-L12
MIN TYP MAX
12
12
±0.1
±0.5
±0.5
±1
LTC2656B/C-L16
MIN TYP MAX
16
16
±0.3
±2
±6
0.6
1
1
±1
2
±0.02 ±0.1
1
TYP
0 to 2.5
0 to 2 • V
EXTREF
–80
l
l
UNITS
Bits
Bits
±1
±4
±12
2
4
3
±2
LSB
LSB
LSB
LSB/mA
LSB/mA
mV
mV
µV/°C
%FSR
ppm/°C
V
CC
= 5V ±10%, Internal Reference, Mid-Scale,
l
–15mA ≤ I
OUT
≤ 15mA
V
CC
= 3V ±10%, Internal Reference, Mid-Scale,
l
–7.5mA ≤ I
OUT
≤ 7.5mA
0.04 0.125
0.06
1
±1
2
0.25
3
±2
ZSE
V
OS
GE
Zero-Scale Error
Offset Error
V
OS
Temperature Coefficient
Gain Error
Gain Temperature Coefficient
V
REF
= 1.25V (Note 4)
l
l
l
±0.02 ±0.1
1
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
MIN
MAX
UNITS
V
V
dB
0.04
0.04
±1.5
±2
±1
0.15
0.15
Ω
Ω
µV
µV/mA
µV
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
l
l
l
l
I
SC
Short-Circuit Output Current
(Note 6)
20
20
10
10
1.248
1.25
±2
±2
–80
65
65
40
40
1.252
±10
mA
mA
mA
mA
V
ppm/°C
ppm/°C
dB
mA
µA
mV/mA
nV/√Hz
Reference
Reference Output Voltage
Reference Temperature Coefficient
Reference Line Regulation
Reference Short-Circuit Current
Reference Load Regulation
Reference Output Voltage Noise
Density
C-Grade (Note 7)
I-Grade (Note 7)
V
CC
±10%
V
CC
= 5.5V, Forcing Output to GND
V
CC
= 3V ±10% or 5V ±10%, I
OUT
= 100µA
Sourcing
C
REFCOMP
= C
REFIN/OUT
= 0.1µF at f = 1kHz
l
l
3
60
40
30
5
200
REFCOMP Pin Short-Circuit Current V
CC
= 5.5V, Forcing Output to GND
2656fa
京公网安备 11010802033920号
EEWORLD
