LTC1592 Linear Integrated Systems, LTC1592 Datasheet - Page 12

• Manufacturer Part Number: LTC1592
• Description: (LTC1588 - LTC1592) 12-/14-/16-Bit SoftSpan DACs
• Manufacturer: Linear Integrated Systems

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APPLICATIO S I FOR ATIO
While not directly addressed by the simple equations in
Tables 2 and 3, temperature effects can be handled just as
easily for unipolar and bipolar applications. First, consult
an op amp’s data sheet to find the worst-case V
over temperature. Then, plug these numbers in the V
and I
ture induced effects.
For applications where fast settling time is important, Appli-
cation Note 74, entitled “ Component and Measurement
Table 2. Variables for Each Output Range That Adjust the
Equations in Table 3
Table 4. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC1588/LTC1589/LTC1592,
with Relevant Specifications
AMPLIFIER
LT1001
LT1097
LT1112 (Dual)
LT1124 (Dual)
LT1468
LT1469 (Dual)
LTC1588/LTC1589/LTC1592
Table 3. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in All Output Ranges
12
A
A
V
V
VOL1
VOL2
I
OUTPUT RANGE
OP AMP
OS1
I
OS2
B2
B1
–2.5V to 7.5V
B
(mV)
(nA)
(mV)
(mV)
(V/V)
(V/V)
equations from Table 3 and calculate the tempera-
10V
2.5V
5V
10V
5V
I
B1
V
OS1
• 0.0003 •
A1 •
INL (LSB)
V
125
25
50
60
70
75
• 2.4 •
OS
V
0
0
0
A
16.5k
U
VOL1
1.1
2.2
1.9
A1
V
2
4
1
5V
V
REF
5V
REF
0.35
0.25
nA
20
10
10
I
U
2
B
I
B1
V
A2
2
3
2
4
1
3
OS1
• 0.00008 •
DNL (LSB)
A2 •
• 0.6 •
V/mV
1000
1500
4000
5000
2000
A
800
W
OL
0
0
0
A
1.2
1.2
1.6
1.5k
A3
VOL1
1
V
5V
REF
V
5V
REF
VOLTAGE
nV/ Hz
NOISE
0.5
A4
1
1
1
2.7
10
14
14
V
5
5
U
I
AMPLIFIER SPECIFICATIONS
OS1
B1
OS
OFFSET (LSB)
UNIPOLAR
• 0.13 •
• 13.2 •
and I
1.5
1.5
2.5
1.5
A5
1
1
0
0
0
0
CURRENT
OS
pA/ Hz
B
NOISE
0.008
0.008
V
0.12
0.3
0.6
0.6
V
5V
REF
5V
REF
Advances Ensure 16-Bit DAC Settling Time ,” offers a thor-
ough discussion of 16-bit DAC settling time and op amp
selection.
Precision Voltage Reference Considerations
Much in the same way selecting an operational amplifier
for use with the LTC1592 is critical to the performance of
the system, selecting a precision voltage reference also
requires due diligence. The output voltage of the LTC1592
is directly affected by the voltage reference; thus, any
voltage reference error will appear as a DAC output voltage
error.
There are three primary error sources to consider when
selecting a precision voltage reference for 16-bit applica-
tions: output voltage initial tolerance, output voltage tem-
perature coefficient and output voltage noise.
Initial reference output voltage tolerance, if uncorrected,
generates a full-scale error term. Choosing a reference
A4 • V
A3 • V
A4 • I
SLEW
RATE
I
V/ s
0.25
0.16
B1
0.2
4.5
22
22
BIPOLAR ZERO
ERROR (LSB)
OS1
OS2
B2
A4 •
• 0.01 •
• 0.05 •
• 19.8 •
• 13.1 •
0
A
66k
VOL2
GAIN BANDWIDTH
V
5V
REF
V
PRODUCT
V
V
5V
REF
5V
5V
REF
REF
MHz
0.75
12.5
0.8
0.7
90
90
I
V
B1
V
OS1
UNIPOLAR GAIN
OS2
I
B2
ERROR (LSB)
• 0.0018 •
A5 •
• 0.1 •
• 13.2 •
• 26.2 •
A
131k
VOL2
with LTC1592
A
131k
t
VOL1
SETTLING
V
5V
V
REF
120
120
115
V
V
2.5
2.5
19
5V
REF
5V
5V
REF
REF
s
V
I
V
B1
OS1
OS2
I
B2
BIPOLAR GAIN
ERROR (LSB)
• 0.0018 •
A5 •
• 0.1 •
• 13.2 •
• 26.2 •
DISSIPATION
10.5/Op Amp
A
123/Op Amp
131k
69/Op Amp
VOL2
POWER
A
131k
mW
117
VOL1
46
11
1588992fa
V
V
V
5V
5V
V
REF
REF
5V
REF
5V
REF