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 LTC2655-L
has a full-scale output of 2.5V with the integrated refer-
ence and operates from a single 2.7V to 5.5V supply.
The LTC2655-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 the 2-wire I
2
C compatible serial interface.
The LTC2655 operates in both the standard mode (maxi-
mum clock rate of 100kHz) and the fast mode (maximum
clock rate of 400kHz). The LTC2655 incorporates a
power-on reset circuit that is controlled by the PORSEL
pin. If PORSEL is tied to GND the DACs power-on reset to
zero-scale. If PORSEL is tied to V
CC
, the DACs power-on
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 and 7671770.
Integrated Reference 10ppm/°C Max
Maximum INL Error: ±4LSB at 16 Bits
Guaranteed Monotonic Over Temperature
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2655-L)
Integrated Reference Buffers
Ultralow Crosstalk Between DACs (<1nV•s)
Power-On-Reset to Zero-Scale/Mid-Scale
Asynchronous DAC Update Pin
Tiny 20-Lead 4mm
×
4mm QFN and
16-Lead Narrow SSOP packages
APPLICATIONS
n
n
n
n
n
Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
Automotive
BLOCK DIAGRAM
REFCOMP
GND
REFLO
REGISTER
REGISTER
REGISTER
REGISTER
V
OUTA
DAC A
DAC D
V
OUTD
INL (LSB)
INTERNAL REFERENCE
REFIN/OUT
INL Curve
V
CC
4
3
2
1
0
–1
DAC C
V
OUTC
–2
–3
POWER-ON
RESET
PORSEL
–4
128
16384
32768
CODE
49152
65535
2655 TA01b
V
CC
= 5V
REGISTER
REGISTER
REGISTER
V
OUTB
CA0
CA1
DAC B
32-BIT SHIFT REGISTER
CA2
SCL
LDAC
2-WIRE INTERFACE
REGISTER
SDA
2655 BD
2655f
1
LTC2655
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
OUTD
................–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
LTC2655C ................................................ 0°C to 70°C
LTC2655I .............................................–40°C to 85°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range ......................–65 to 150°C
Lead Temperature, GN Only (Soldering, 10 sec).... 300°C
PIN CONFIGURATION
TOP VIEW
REFLO
GND
DNC
DNC
15 DNC
14 V
OUTD
21
GND
13 V
OUTC
12 PORSEL
11 CA0
6
CA2
7
SCL
8
DNC
9 10
SDA
CA1
TOP VIEW
REFLO
V
OUTA
REFCOMP
V
OUTB
REFIN/OUT
LDAC
CA2
SCL
1
2
3
4
5
6
7
8
16 GND
15 V
CC
14 V
OUTD
13 V
OUTC
12 PORSEL
11 CA0
10 CA1
9
SDA
V
OUTA
1
REFCOMP 2
V
OUTB
3
REFIN/OUT 4
LDAC
5
V
CC
20 19 18 17 16
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 110°C/W
UF PACKAGE
20-LEAD (4mm 4mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 37°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
2655f
2
LTC2655
ORDER INFORMATION
LTC2655
B
C
UF
–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
UF = 20-Lead (4mm
×
4mm) Plastic QFN
GN = 16-Lead Narrow SSOP
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. Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
2655f
3
LTC2655
PRODUCT SELECTION GUIDE
LEAD FREE FINISH
LTC2655BCGN-L16#PBF
LTC2655BIGN-L16#PBF
LTC2655BCUF-L16#PBF
LTC2655BIUF-L16#PBF
LTC2655BCGN-H16#PBF
LTC2655BIGN-H16#PBF
LTC2655BCUF-H16#PBF
LTC2655BIUF-H16#PBF
LTC2655CGN-L12#PBF
LTC2655IGN-L12#PBF
LTC2655CUF-L12#PBF
LTC2655IUF-L12#PBF
LTC2655CGN-H12#PBF
LTC2655IGN-H12#PBF
LTC2655CUF-H12#PBF
LTC2655IUF-H12#PBF
TAPE AND REEL
LTC2655BCGN-L16#TRPBF
LTC2655BIGN-L16#TRPBF
LTC2655BCUF-L16#TRPBF
LTC2655BIUF-L16#TRPBF
LTC2655BIGN-H16#TRPBF
LTC2655BCUF-H16#TRPBF
LTC2655BIUF-H16#TRPBF
LTC2655CGN-L12#TRPBF
LTC2655IGN-L12#TRPBF
LTC2655CUF-L12#TRPBF
LTC2655IUF-L12#TRPBF
LTC2655CGN-H12#TRPBF
LTC2655IGN-H12#TRPBF
LTC2655CUF-H12#TRPBF
LTC2655IUF-H12#TRPBF
PART MARKING* PACKAGE DESCRIPTION
655L16
655L16
55L16
55L16
655H16
55H16
55H16
655L12
655L12
55L12
55L12
655H12
655H12
55H12
55H12
16-Lead Narrow SSOP
16-Lead Narrow SSOP
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
16-Lead Narrow SSOP
16-Lead Narrow SSOP
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
16-Lead Narrow SSOP
16-Lead Narrow SSOP
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) Plastic QFN
16-Lead Narrow SSOP
16-Lead Narrow SSOP
20-Lead (4mm
×
4mm) Plastic QFN
20-Lead (4mm
×
4mm) 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
LTC2655BCGN-H16#TRPBF 655H16
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/
2655f
4
LTC2655
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
随着阅读器与标签价格的降低和全球市场的扩大，射频标识 RFID(以下简称RFID)的应用与日俱增。标签既可由阅读器供电(无源标签)，也可以由标签的板上电源供电(半有源标签和有源标签)。由于亚微型无源 CMOS 标签的成本降低，库存和其他应用迅速增加。一些评估表明，随着无源标签的价格持续下降，几乎每一个售出产品的内部都将有一个 RFID 标签。由于无源 RFID 标签的重要性及其独特的工程实现...[详细]
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