They operate from a single 3V to 5V supply and are guar-
anteed monotonic over temperature. The LTC2754A-16
provides full 16-bit performance (±1LSB INL and DNL,
max) over temperature without any adjustments. These
SoftSpan™ DACs offer six output ranges (up to ±10V) that
can be programmed through the 3-wire SPI serial interface,
or pinstrapped for operation in a single range.
The content of any on-chip register (including DAC out-
put-range settings) can be verified in just one instruction
cycle; and if you change any register, that register will be
automatically read back during the next instruction cycle.
Voltage-controlled offset and gain adjustments are also
provided; and the power-on reset circuit and
CLR
pin both
reset the DAC outputs to 0V regardless of output range.
L,
LT, LTC, LTM, Linear Technology and the Linear logo 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 5481178.
Program or Pin-Strap Six Output Ranges
0V to 5V, 0V to 10V, –2.5V to 7.5V, ±2.5V, ±5V, ±10V
Maximum 16-Bit INL Error: ±1 LSB over
Temperature
Guaranteed Monotonic over Temperature
Low Glitch Impulse 0.26nV•s (3V), 1.25nV•s (5V)
Serial Readback of All On-Chip Registers
Low 1μA Maximum Supply Current
2.7V to 5.5V Single-Supply Operation
16-Bit Settling Time: 2μs
Voltage-Controlled Offset and Gain Trims
Clear and Power-On-Reset to 0V Regardless of
Output Range
52-Pin 7mm
×
8mm 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
REFA
GE
ADJA
R
COMA
R
COMB
GE
ADJB
V
REFB
REFA
R
OFSA
R
OFSB
R
INA
R
INB
V
DD
V
OSADJA
I
OUT2A
I
OUT1A
R
FBA
REFB
V
OUTA
DAC A
DAC B
I
OUT1B
R
FBB
INL (LSB)
SPI with READBACK
R
FBD
I
OUT1D
I
OUT2D
V
OSADJD
DAC D
V
OUTD
LTC2754-16
R
FBC
DAC C
I
OUT2C
V
OSADJC
REFD
R
OFSD
GND
M-SPAN
R
IND
REFC
R
GE
ADJC COMC
R
COMD
R
OFSC
R
INC
GE
ADJD
ALL AMPLIFIERS 1/2 LT1469
V
REFD
V
REFC
2754 TA01
+
–
I
OUT1C
–
+
–
+
+
–
–
+
+
–
LTC2754-16 Integral
Nonlinearity (INL)
1.0
V
OSADJB
I
OUT2B
V
OUTB
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
49152
65535
2754 G01
V
DD
= 5V
V
REF
= 5V
±10V RANGE
–
+
+
–
V
OUTC
2754f
1
LTC2754
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
OSADJA
V
OSADJB
R
COMA
R
COMB
40 GE
ADJB
39 R
INB
38 I
OUT2B
37 GND
36
LDAC
35 S2
53
34 S1
33 S0
32 M-SPAN
31
RFLAG
30
CLR
29 I
OUT2C
28 R
INC
27 GE
ADJC
15 16 17 18 19 20 21 22 23 24 25 26
R
COMD
R
OFSD
R
FBD
I
OUT1D
V
OSADJD
V
OSADJC
R
OFSC
R
COMC
REFD
I
OUT1C
R
FBC
REFC
I
OUT1A
I
OUT1B
R
OFSA
R
OFSB
REFB
REFA
R
FBA
R
FBB
I
OUT1X
, I
OUT2X
to GND ............................................±0.3V
R
INX
, R
COMX
, REFX, R
FBX
, R
OFSX
, V
OSADJX
,
GE
ADJX
to GND ........................................................±18V
V
DD
to GND .................................................. –0.3V to 7V
Digital Inputs and
Outputs to GND ................ –0.3V to V
DD
+0.3V (max 7V)
Operating Temperature Range
LTC2754C ................................................ 0°C to 70°C
LTC2754I..............................................–40°C to 85°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range...................–65°C to 150°C
52 51 50 49 48 47 46 45 44 43 42 41
GE
ADJA
1
R
INA
2
I
OUT2A
3
GND 4
CS/LD
5
SDI 6
SCK 7
SRO 8
SROGND 9
V
DD
10
GND 11
I
OUT2D
12
R
IND
13
GE
ADJD
14
UKG PACKAGE
52-LEAD (7mm 8mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 53) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2754CUKG-12#PBF
LTC2754IUKG-12#PBF
LTC2754BIUKG-16#PBF
LTC2754AIUKG-16#PBF
TAPE AND REEL
LTC2754CUKG-12#TRPBF
LTC2754IUKG-12#TRPBF
LTC2754BIUKG-16#TRPBF
LTC2754AIUKG-16#TRPBF
PART MARKING*
LTC2754UKG-12
LTC2754UKG-12
LTC2754UKG-16
LTC2754UKG-16
LTC2754UKG-16
LTC2754UKG-16
PACKAGE DESCRIPTION
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) Plastic QFN
52-Lead (7mm
×
8mm) 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
LTC2754BCUKG-16#PBF LTC2754BCUKG-16#TRPBF
LTC2754ACUKG-16#PBF LTC2754ACUKG-16#TRPBF
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/
2754f
2
LTC2754
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
Resolution
Monotonicity
DNL
INL
GE
Differential
Nonlinearity
Integral Nonlinearity
Gain Error
Gain Error Temp-
erature Coefficient
BZE
Bipolar Zero Error
Bipolar Zero Temp-
erature Coefficient
PSR
I
LKG
Power Supply
Rejection
V
DD
= 5V, ±10%
V
DD
= 3V, ±10%
●
●
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.
CONDITIONS
●
●
●
●
LTC2754-12
MIN
TYP
MAX
12
12
±1
±1
±0.5
±1
●
LTC2754B-16
MIN
TYP
MAX
16
16
±1
±2
±20
±1
LTC2754A-16
MIN
TYP
MAX
16
16
±0.2
±0.4
±2
±1
±1
±1
±12
UNITS
Bits
Bits
LSB
LSB
LSB
ppm/°C
Static Performance
All Output Ranges
ΔGain/ΔTemp
All Bipolar Ranges
●
±2
±0.2
±0.5
±1
±0.5
±0.025
±0.06
±12
±1
±0.5
±8
LSB
ppm/°C
±0.4
±1
±0.05
±2
±5
±0.03
±0.1
±0.05
±0.2
±0.5
±2
±5
LSB/V
LSB/V
nA
nA
I
OUT1
Leakage Current T
A
= 25°C
T
MIN
to T
MAX
±0.05
●
±2
±5
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
Analog Pins
Reference Inverting Resistors
R
REF
R
FB
R
OFS
R
VOSADJ
R
GEADJ
C
IOUT1
DAC Input Resistance
Feedback Resistors
Bipolar Offset Resistors
Offset Adjust Resistors
Gain Adjust Resistors
Output Capacitance
Full-Scale
Zero-Scale
0V to 10V Range, 10V Step. To ±0.0015% FS
(Note 5)
V
DD
= 5V (Note 6)
V
DD
= 3V (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
1024
2048
TYP
20
10
10
20
1280
2560
75
45
2
1.25
0.26
2
2
0.5
–109
–110
13
MAX
UNITS
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
pF
Dynamic Performance
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
μs
nV•s
nV•s
nV•s
MHz
mV
dB
dB
nV/√Hz
2754f
3
LTC2754
ELECTRICAL CHARACTERISTICS
SYMBOL
Power Supply
V
DD
I
DD
Digital Inputs
V
IH
V
IL
Digital Input High Voltage
Digital Input Low Voltage
Hysteresis Voltage
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 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
0.1
±1
6
V
DD
– 0.4
0.4
V
V
V
μA
pF
V
V
Digital Input Current
Digital Input Capacitance
●
●
TIMING CHARACTERISTICS
otherwise specifications are at T
A
= 25°C.
SYMBOL
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
PARAMETER
SDI Valid to SCK Set-Up
SDI Valid to SCK Hold
SCK High Time
SCK Low Time
CS/LD
Pulse Width
LSB SCK High to
CS/LD
High
CS/LD
Low to SCK Positive Edge
CS/LD
High to SCK Positive Edge
SRO Propagation Delay
CLR
Pulse Width Low
LDAC
Pulse Width Low
CLR
Low to
RFLAG
Low
CS/LD
High to
RFLAG
High
SCK Frequency
V
DD
= 2.7V to 3.3V
t
1
t
2
t
3
t
4
t
5
t
6
SDI Valid to SCK Set-Up
SDI Valid to SCK Hold
SCK High Time
SCK Low Time
CS/LD
Pulse Width
LSB SCK High to
CS/LD
High
V
DD
= 4.5V to 5.5V
The
●
denotes specifications that apply over the full operating temperature range,
CONDITIONS
●
●
●
●
●
●
●
●
MIN
7
7
11
11
9
4
4
4
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
C
LOAD
= 10pF
●
●
●
18
36
15
50
40
40
9
9
15
15
12
5
ns
ns
ns
ns
ns
MHz
ns
ns
ns
ns
ns
ns
C
LOAD
= 10pF (Note 11)
C
LOAD
= 10pF (Note 11)
50% Duty Cycle (Note 12)
●
●
●
●
(Note 11)
C
L
= 10pF
●
●
●
●
●
2754f
4
LTC2754
TIMING CHARACTERISTICS
otherwise specifications are at T
A
= 25°C.
PARAMETER
CS/LD
Low to SCK Positive Edge
CS/LD
High to SCK Positive Edge
SRO Propagation Delay
CLR
Pulse Width Low
LDAC
Pulse Width Low
CLR
Low to
RFLAG
Low
CS/LD
High to
RFLAG
high
SCK Frequency
C
LOAD
= 10pF (Note 11)
C
LOAD
= 10pF (Note 11)
50% Duty Cycle (Note 12)
C
LOAD
= 10pF
SYMBOL
t
7
t
8
t
9
t
10
t
11
t
12
t
13
The
●
denotes specifications that apply over the full operating temperature range,
CONDITIONS
●
●
●
●
●
●
●
●
MIN
5
5
TYP
MAX
UNITS
ns
ns
26
60
20
70
60
25
ns
ns
ns
ns
ns
MHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Continuous operation above the specified maximum operating
junction temperature may impair device reliability.
Note 3:
Because of the proprietary SoftSpan switching architecture, the
measured resistance looking into each of the specified pins is constant for
all output ranges if the I
OUT1X
and I
OUT2X
pins are held at ground.
Note 4:
Input resistors measured from R
INX
to R
COMX
; feedback resistors
measured from R
COMX
to REFX.
Note 5:
Using LT1469 with C
FEEDBACK
= 15pF. A ±0.0015% settling time
of 1.7μs can be achieved by optimizing the time constant on an individual
basis. See Application Note 74, Component and Measurement Advances
Ensure 16-Bit DAC Settling Time.
Note 6:
Measured at the major carry transition, 0V to 5V range. Output
amplifier: LT1469; C
FB
= 27pF.
Note 7.
Full-scale transition; REF = 0V.
Note 8.
Analog Crosstalk is defined as the AC voltage ratio V
OUTB
/V
REFA
,
expressed in dB. REFB is grounded, and DAC B is set to 0V-5V span and
zero-, mid- or full- scale code. V
REFA
is a 3V
RMS
, 1kHz sine wave. Crosstalk
between other DAC channels is similar or better.
Note 9.
REF = 6V
RMS
at 1kHz. 0V to 5V range. DAC code = FS. Output
amplifier = LT1469.
Note 10.
Calculation from V
n
= √4kTRB, where k = 1.38E-23 J/°K
(Boltzmann constant), R = resistance (Ω), T = temperature (°K), and B =
bandwidth (Hz). 0V to 5V Range; zero-, mid-, or full- scale.
Note 11.
Guaranteed by design, not subject to test.
Note 12.
When using SRO, maximum SCK frequency f
MAX
is limited by
SRO propagation delay t
9
as follows:
⎛
⎞
1
⎟
f
MAX
= ⎜
⎜
2
(
t
+
t
)
⎟
, where t is the setup time of the receiving device.
源代码如下：
Private Sub Form_Load()
Dim word, meaning As String
Open "words.dat" For Input Access Read As #1
Do While Not EOF(1)
Input #1, word, meaning
......
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