multiplying parallel-input, current-output DACs. These
DACs operate from a single 2.7V to 5.5V supply and are all
guaranteed monotonic over temperature. The LTC2755A-16
provides 16-bit performance (±1LSB INL and DNL) over
temperature without any adjustments. These SoftSpan™
DACs offer six output ranges—two unipolar and four
bipolar—that can be programmed through the parallel
interface, or pinstrapped for operation in a single range.
The LTC2755 DACs use a bidirectional input/output paral-
lel interface that allows readback of any internal register,
including the DAC output span settings. A power-on reset
circuit resets the DAC outputs to 0V when power is initially
applied. A logic low on the
CLR
pin asynchronously clears
the DACs to 0V in any output range.
The parts are specified over commercial and industrial
temperature ranges.
, LT LTC and LTM are registered trademarks of Linear Technology Corporation.
,
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7034735,
7256721.
■
■
■
■
■
■
■
■
■
■
Program or Pin-Strap Six Output Ranges
Unipolar: 0V to 5V, 0V to 10V
Bipolar: ±5V, ±10V, ±2.5V, –2.5V to 7.5V
Maximum 16-Bit INL Error: ±1 LSB over Temperature
Low 1μA (Maximum) Supply Current
Guaranteed Monotonic over Temperature
Low Glitch Impulse 1nV•s
2.7V to 5.5V Single Supply Operation
2μs Settling Time to ±1 LSB
Parallel Interface with Readback of All Registers
Asynchronous
CLR
Pin Clears DAC Outputs to 0V in
Any Output Range
Power-On Reset to 0V
64-Pin 9mm × 9mm QFN Package
APPLICATIONS
■
■
■
■
High Resolution Offset and Gain Adjustment
Process Control and Industrial Automation
Automatic Test Equipment
Data Acquisition Systems
TYPICAL APPLICATION
Quad 16-Bit V
OUT
DAC with Software-Selectable Ranges
V
REF1
5V
SoftSpan Parallel I
OUT
DAC Selector Guide
SINGLE
Part Number
LTC2751
DUAL
LTC2753
QUAD
LTC2755
+
–
R
IN1
R
COM1
REFA REFB
R
OFSB
R
VOSB
I
OUT2B
DAC B
DAC A
I
OUT1B
R
FBB
V
DD
I/O PORT
I/O PORT
LTC2755-16
R
FBC
I
OUT1C
DAC C
DAC D
I
OUT2C
R
VOSC
5V
0.1μF
R
OFSA
R
VOSA
V
OUTA
+
–
SPAN I/O
DATA I/O
I
OUT2A
I
OUT1A
R
FBA
+
–
LTC2755-16 Integral Nonlinearity (INL)
V
OUTB
1.0
V
DD
= 5V
0.8
V
REF
= 5V
±10V
RANGE
0.6
0.4
INL (LSB)
0.2
0.0
–0.2
–0.4
–0.6
–0.8
25°C
90°C
–45°C
0
16384
32768
CODE
49152
65535
2755 TA01b
R
FBD
V
OUTD
–
+
I
OUT1D
I
OUT2D
R
VOSD
GND
MSPAN
R
OFSD
REFD REFC
–
+
V
OUTC
R
COM2
R
IN2
R
OFSC
2755 TA01
–1.0
V
REF2
5V
+
–
2755f
1
LTC2755
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
I
OUT1X
, I
OUT2X
, R
COMX
to GND................................±0.3V
R
VOSX
, R
FBX
, R
OFSX
, R
INX
, REF
X
to GND..................±15V
V
DD
to GND .................................................. –0.3V to 7V
Digital Inputs and Digital I/O
to GND ..........................–0.3V to V
DD
+0.3V (max 7V)
Operating Temperature Range
LTC2755C..................................................... 0°C to 70°C
LTC2755I .................................................. –40°C to 85°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
R
IN1
R
COM1
REFA
R
OFSA
R
FBA
I
OUT1A
R
VOSA
R
VOSB
I
OUT1B
R
FBB
R
OFSB
REFB
S1
WR
UPD
READ
R
IN1
R
COM1
REFA
R
OFSA
R
FBA
I
OUT1A
R
VOSA
R
VOSB
I
OUT1B
R
FBB
R
OFSB
REFB
S1
WR
UPD
READ
R
IN1
R
COM1
REFA
R
OFSA
R
FBA
I
OUT1A
R
VOSA
R
VOSB
I
OUT1B
R
FBB
R
OFSB
REFB
S1
WR
UPD
READ
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
D/S
S2 1
S0
I
OUT2A
2
I
OUT2B
GND 3
GND
D15 4
NC
D14 5
NC
D13 6
NC
D12 7
NC
D11 8
D0
D10 9
D1
D9 10
D2
D8 11
D3
D7 12
D4
GND 13
GND
I
OUT2D
14
I
OUT2C
V
DD
15
MSPAN
A2 16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
D/S
S0
I
OUT2B
GND
NC
NC
D0
D1
D2
D3
D4
D5
D6
GND
I
OUT2C
MSPAN
65
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
A1
A0
GND
CLR
REFD
R
OFSD
R
FBD
I
OUT1D
R
VOSD
R
VOSC
I
OUT1C
R
FBC
R
OFSC
REFC
R
COM2
R
IN2
LTC2755-16 UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
S2 1
I
OUT2A
2
GND 3
D11 4
D10 5
D9 6
D8 7
D7 8
D6 9
D5 10
D4 11
D3 12
GND 13
I
OUT2D
14
V
DD
15
A2 16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
D/S
S0
I
OUT2B
GND
NC
NC
NC
NC
NC
NC
D0
D1
D2
GND
I
OUT2C
MSPAN
S2 1
I
OUT2A
2
GND 3
D13 4
D12 5
D11 6
D10 7
D9 8
D8 9
D7 10
D6 11
D5 12
GND 13
I
OUT2D
14
V
DD
15
A2 16
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
65
65
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
A1
A0
GND
CLR
REFD
R
OFSD
R
FBD
I
OUT1D
R
VOSD
R
VOSC
I
OUT1C
R
FBC
R
OFSC
REFC
R
COM2
R
IN2
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
A1
A0
GND
CLR
REFD
R
OFSD
R
FBD
I
OUT1D
R
VOSD
R
VOSC
I
OUT1C
R
FBC
R
OFSC
REFC
R
COM2
R
IN2
LTC2755-14 UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
LTC2755-12 UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 28°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 28°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
T
JMAX
= 125°C,
θ
JA
= 28°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2755CUP-12#PBF
LTC2755IUP-12#PBF
LTC2755CUP-14#PBF
LTC2755IUP-14#PBF
LTC2755BCUP-16#PBF
LTC2755BIUP-16#PBF
LTC2755ACUP-16#PBF
LTC2755AIUP-16#PBF
TAPE AND REEL
LTC2755CUP-12#TRPBF
LTC2755IUP-12#TRPBF
LTC2755CUP-14#TRPBF
LTC2755IUP-14#TRPBF
LTC2755BCUP-16#TRPBF
LTC2755BIUP-16#TRPBF
LTC2755ACUP-16#TRPBF
LTC2755AIUP-16#TRPBF
PART MARKING*
LTC2755UP-12
LTC2755UP-12
LTC2755UP-14
LTC2755UP-14
LTC2755UP-16
LTC2755UP-16
LTC2755UP-16
LTC2755UP-16
PACKAGE DESCRIPTION
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) 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
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/
2755f
2
LTC2755
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
Static Performance
Resolution
Monotonicity
DNL
INL
GE
GE
TC
BZE
BZS
TC
PSR
I
LKG
C
IOUT1
Differential
Nonlinearity
Integral
Nonlinearity
Gain Error
Gain Error Temp-
erature Coefficient
Bipolar Zero Error
Bipolar Zero Temp-
erature Coefficient
Power Supply
Rejection
I
OUT1
Leakage
Current
Output
Capacitance
V
DD
= 5V, ±10%
V
DD
= 3V, ±10%
T
A
= 25°C
T
MIN
to T
MAX
Full-Scale
Zero Scale
●
●
●
●
●
●
V
DD
= 5V, V
REF
= 5V unless otherwise specified. The
●
denotes the
specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
LTC2755-12
CONDITIONS
MIN
12
12
±1
±1
±0.5
±0.6
●
LTC2755-14
MIN
14
14
±1
±1
±1
±0.6
±1
±0.5
±0.5
±3
±5
TYP
MAX
LTC2755B-16
MIN
16
16
±1
±2
±20
±0.6
±12
±0.5
TYP
MAX
LTC2755A-16
MIN
16
16
±0.2
±0.4
±2
±0.6
±1
±0.5
±8
±1
±1
±12
TYP
MAX
UNITS
Bits
Bits
LSB
LSB
LSB
ppm/°C
LSB
ppm/°C
LSB/V
LSB/V
nA
nA
pF
pF
TYP
MAX
All Output
Ranges
ΔGain/ΔTemp
All Bipolar
Ranges
●
±2
±0.2
±0.5
±0.025
±0.06
±0.05
±2
±5
±0.05
75
45
±0.1
±0.25
±2
±5
±0.05
75
45
±0.4
±1
±2
±5
±0.03 ±0.2
±0.1 ±0.5
±0.05
75
45
±2
±5
●
75
45
V
DD
= 5V, V
REF
= 5V unless otherwise specified. The
●
denotes specifications that apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C.
SYMBOL
Resistances (Note 3)
R1, R2, R3, R4
R
REF
R
FB
R
OFS
R
VOS
Reference Inverting Resistors
DAC Input Resistance
Feedback Resistor
Bipolar Offset Resistor
Offset Adjust Resistor
Output Settling Time
Glitch Impulse
Digital-to-Analog Glitch Impulse
Reference Multiplying BW
Multiplying Feedthrough Error
Analog Crosstalk
THD
Total Harmonic Distortion
Output Noise Voltage Density
0V to 10V Range, 10V Step. To ±0.0015% FS
(Note 5)
(Note 6)
(Note 7)
0V to 5V Range, V
REF
= 3V
RMS
,
code = Full Scale, –3dB BW
0V to 5V Range, V
REF
= ±10V, 10kHz
Sine Wave
(Note 8)
(Note 9) Multiplying
(Note 10) at I
OUT1
(Note 3)
(Note 3)
(Note 4)
●
●
●
●
●
PARAMETER
CONDITIONS
MIN
16
8
8
16
800
TYP
20
10
10
20
1000
2
1
1
2
0.5
–109
–110
13
MAX
UNITS
kΩ
kΩ
kΩ
kΩ
kΩ
μs
nV•s
nV•s
MHz
mV
dB
dB
⎯
nV/√H
⎯
z
2755f
Dynamic Performance
3
LTC2755
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
DD
I
DD
Digital Inputs
V
IH
V
IL
I
IN
C
IN
Digital Outputs
V
OH
V
OL
I
OH
= 200μA
I
OL
= 200μA
2.7V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 5.5V
●
●
V
DD
= 5V, V
REF
= 5V unless otherwise specified. The
●
denotes the
specifications which apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Supply Voltage
Supply Current, V
DD
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Current
Digital Input Capacitance
Digital Inputs = 0V or V
DD
3.3V ≤ V
DD
≤ 5.5V
2.7V ≤ V
DD
< 3.3V
4.5V < V
DD
≤ 5.5V
2.7V ≤ V
DD
≤ 4.5V
V
IN
= GND to V
DD
V
IN
= 0V (Note 11)
CONDITIONS
●
●
MIN
2.7
TYP
MAX
5.5
UNITS
V
μA
V
V
0.5
2.4
2
1
●
●
●
●
●
●
0.8
0.6
±1
6
V
DD
– 0.4
0.4
V
V
μA
pF
V
V
TIMING CHARACTERISTICS
otherwise specifications are at T
A
= 25°C.
SYMBOL
PARAMETER
V
DD
= 4.5V to 5.5V
Write and Update Timing
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
11
t
12
t
13
t
14
t
15
t
26
t
27
I/O Valid to
WR
Rising Edge Set-Up
I/O Valid to
WR
Rising Edge Hold
WR
Pulse Width Low
UPD Pulse Width High
UPD Falling Edge to
WR
Falling Edge
WR
Rising Edge to UPD Rising Edge
D/S
Valid to
WR
Falling Edge Set-Up Time
WR
Rising Edge to
D/S
Valid Hold Time
A2-A0 Valid to
WR
Falling Edge Setup Time
WR
Rising Edge to A2-A0 Valid Hold Time
A2-A0 Valid to UPD Rising Edge Setup Time
UPD Falling Edge to A2-A0 Valid Hold Time
WR
Rising Edge to READ Rising Edge
READ Falling Edge to
WR
Falling Edge
READ Rising Edge to I/O Propagation Delay
A2-A0 Valid to READ Rising Edge Setup Time
READ Falling to A2-A0 Valid Hold Time
The
●
denotes specifications that apply over the full operating temperature range,
CONDITIONS
MIN
TYP
MAX
UNITS
●
●
●
●
7
7
15
15
0
0
7
7
5
0
9
7
7
20
40
20
0
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
No Data Shoot-Through
(Note 11)
●
●
●
●
●
●
●
●
Readback Timing
●
(Note 11)
C
L
= 10pF
(Note 11)
●
●
●
●
2755f
4
LTC2755
TIMING CHARACTERISTICS
otherwise specifications are at T
A
= 25°C.
PARAMETER
UPD Valid to I/O Propagation Delay
D/S
Valid to READ Rising Edge
READ Rising Edge to UPD Rising Edge
UPD Falling Edge to READ Falling Edge
READ Falling Edge to UPD Rising Edge
I/O Bus Hi-Z to READ Rising Edge
READ Falling Edge to I/O Bus Active
CLR
Pulse Width Low
SYMBOL
t
17
t
18
t
19
t
20
t
22
t
23
t
24
CLR
Timing
t
25
●
The
●
denotes specifications that apply over the full operating temperature range,
据外媒报道，萨里大学（University of Surrey）的研究人员开发出一种无需依赖GPS即可在人口密集的城市地区精确定位设备位置的人工智能系统。该系统可将定位误差从734米缩小到22米以内，这对于自动驾驶汽车和救援车辆等技术的发展意义重大。 图片来源： 萨里大学 在发表于《IEEE Robotics and Automation Letters》的论文中，研究人员介绍了PEn...[详细]
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