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LTC2754BIUKG-16TRPBF Datasheet(PDF) 20 Page - Linear Technology

Part # LTC2754BIUKG-16TRPBF
Description  Quad 12-/16-Bit SoftSpan IOUT DACs
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2754BIUKG-16TRPBF Datasheet(HTML) 20 Page - Linear Technology

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LTC2754
20
2754f
APPLICATIONS INFORMATION
Op Amp Selection
Because of the extremely high accuracy of the 16-bit
LTC2754-16, careful thought should be given to op amp
selection in order to achieve the exceptional performance
of which the part is capable. Fortunately, the sensitivity of
INL and DNL to op amp offset has been greatly reduced
compared to previous generations of multiplying DACs.
Tables 4 and 5 contain equations for evaluating the effects
of op amp parameters on the LTC2754’s accuracy when
programmed in a unipolar or bipolar output range. These
are the changes the op amp can cause to the INL, DNL,
unipolar offset, unipolar gain error, bipolar zero and bipolar
gain error. Tables 4 and 5 can also be used to determine
the effects of op amp parameters on the LTC2754-12.
However, the results obtained from Tables 4 and 5 are
in 16-bit LSBs. Divide these results by 16 to obtain the
correct LSB sizing.
Table 6 contains a partial list of LTC precision op amps
recommended for use with the LTC2754. The easy-to-use
design equations simplify the selection of op amps to meet
Table 4. Coefficients for the Equations in Table 5
OUTPUT RANGE
A1
A2
A3
A4
A5
5V
1.1
2
1
1
10V
2.2
3
0.5
1.5
±5V
2
2
1
1
1.5
±10V
4
4
0.83
1
2.5
±2.5V
1
1
1.4
1
1
–2.5V to 7.5V
1.9
3
0.7
0.5
1.5
A3 • VOS1 • 19.8 •
IB1 • 0.13 • 
0
A4 • VOS2 • 13.1 •
A4 • IB2 • 0.13 • 
A4 •
()
5V
VREF
()
5V
VREF
()
16.5k
AVOL1
OP AMP
VOS1 (mV)
IB1 (nA)
AVOL1 (V/V)
VOS2 (mV)
IB2 (mV)
AVOL2 (V/V)
VOS1 • 3.2 •
IB1 • 0.0003 • 
A1 •
0
0
0
INL (LSB)
()
5V
VREF
()
5V
VREF
()
1.5k
AVOL1
()
66k
AVOL2
()
131k
AVOL1
()
131k
AVOL1
()
131k
AVOL2
()
131k
AVOL2
VOS1 • 0.82 •
IB1 • 0.00008 • 
A2 •
0
0
0
DNL (LSB)
()
5V
VREF
()
5V
VREF
A3 • VOS1 • 13.2 •
IB1 • 0.13 • 
0
0
0
0
UNIPOLAR
OFFSET (LSB)
()
5V
VREF
()
5V
VREF
()
5V
VREF
VOS1 • 13.2 •
IB1 • 0.0018 •
A5 •
VOS2 • 26.2 •
IB2 • 0.26 •
BIPOLAR GAIN
ERROR (LSB)
()
5V
VREF
()
5V
VREF
()
()
()
5V
VREF
()
5V
VREF
BIPOLAR ZERO
ERROR (LSB)
UNIPOLAR GAIN
ERROR (LSB)
()
5V
VREF
()
5V
VREF
()
5V
VREF
()
5V
VREF
()
5V
VREF
VOS1 • 13.2 •
IB1 • 0.0018 •
A5 •
VOS2 • 26.2 •
IB2 • 0.26 •
Table 5. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in All Output Ranges (Circuit of Page 1). Subscript 1
Refers to Output Amp, Subscript 2 Refers to Reference Inverting Amp.
Table 6. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC2754 with Relevant Specifications
AMPLIFIER
AMPLIFIER SPECIFICATIONS
VOS
μV
IB
nA
AVOL
V/mV
VOLTAGE
NOISE
nV/√Hz
CURRENT
NOISE
pA/√Hz
SLEW
RATE
V/μs
GAIN BANDWIDTH
PRODUCT
MHz
tSETTLING
with LTC2755
μs
POWER
DISSIPATION
mW
LT1001
25
2
800
10
0.12
0.25
0.8
120
46
LT1097
50
0.35
1000
14
0.008
0.2
0.7
120
11
LT1112 (Dual)
60
0.25
1500
14
0.008
0.16
0.75
115
10.5/Op Amp
LT1124 (Dual)
70
20
4000
2.7
0.3
4.5
12.5
19
69/Op Amp
LT1468
75
10
5000
5
0.6
22
90
2
117
LT1469 (Dual)
125
10
2000
5
0.6
22
90
2
123/Op Amp


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