參數(shù)資料
型號: LTC1599AIN
廠商: LINEAR TECHNOLOGY CORP
元件分類: DAC
英文描述: 16-Bit Byte Wide, Low Glitch Multiplying DAC with 4-Quadrant Resistors
中文描述: PARALLEL, WORD INPUT LOADING, 1 us SETTLING TIME, 16-BIT DAC, PDIP24
封裝: 0.300 INCH, PLASTIC, DIP-24
文件頁數(shù): 10/20頁
文件大?。?/td> 254K
代理商: LTC1599AIN
10
LTC1599
APPLICATIO
S I
FOR
ATIO
U
configured in unipolar or bipolar modes of operation
(Figures 1 and 3). These are the changes the op amp can
cause to the INL, DNL, unipolar offset, unipolar gain error,
bipolar zero and bipolar gain error. Table 4 contains a
partial list of LTC precision op amps recommended for use
with the LTC1599. The two sets of easy-to-use design
equations simplify the selection of op amps to meet the
system’s specified error budget. Select the amplifier from
Table 4 and insert the specified op amp parameters in
either Table 2 or Table 3. Add up all the errors for each
category to determine the effect the op amp has on the
accuracy of the LTC1599. Arithmetic summation gives an
(unlikely) worst-case effect. RMS summation produces a
more realistic effect.
Op amp offset will contribute mostly to output offset and
gain error and has minimal effect on INL and DNL. For the
LTC1599, a 500
μ
V op amp offset will cause about 0.55LSB
W
U
U
INL degradation and 0.15LSB DNL degradation with a 10V
full-scale range (20V range in bipolar). For the LTC1599
configured in the unipolar mode, the same 500
μ
V op amp
offset will cause a 3.3LSB zero-scale error and a 3.45LSB
gain error with a 10V full-scale range.
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
OS
and I
B
over temperature. Then, plug these numbers in the V
OS
and I
B
equations from Table 2 or Table 3 and calculate the
temperature induced effects.
For applications where fast settling time is important,
Application Note 74, entitled “Component and Measure-
ment Advances Ensure 16-Bit DAC Settling Time” offers
a thorough discussion of 16-bit DAC settling time and op
amp selection.
Table 4. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC1599, with Relevant Specifications
Amplifier Specifications
VOLTAGE
V
OS
I
B
A
OL
NOISE
AMPLIFIER
μ
V
nA
V/mV
nV/
Hz
LT1001
25
2
800
10
LT1097
50
0.35
1000
14
LT1112 (Dual)
60
0.25
1500
14
LT1124 (Dual)
70
20
4000
2.7
LT1468
75
10
5000
5
CURRENT
NOISE
pA/
Hz
0.12
0.008
0.008
0.3
0.6
SLEW
RATE
V/
μ
s
0.25
0.2
0.16
4.5
22
GAIN BANDWIDTH
PRODUCT
MHz
0.8
0.7
0.75
12.5
90
t
SETTLING
with LTC1599
μ
s
120
120
115
19
2.5
POWER
DISSIPATION
mW
46
11
10.5/Op Amp
69/Op Amp
117
Table 2. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in Unipolar Applications
OP AMP
INL (LSB)
DNL (LSB)
V
OS
(mV)
V
OS
1.2 (10V/V
REF
)
V
OS
0.3 (10V/V
REF
)
I
B
(nA)
I
B
0.00055 (10V/V
REF
)
I
B
0.00015 (10V/V
REF
)
A
VOL
(V/V)
10k/A
VOL
UNIPOLAR OFFSET (LSB)
V
OS
6.6 (10V/V
REF
)
I
B
0.065 (10V/V
REF
)
0
UNIPOLAR GAIN ERROR (LSB)
V
OS
6.9 (10V/V
REF
)
0
131k/A
VOL
3k/A
VOL
Table 3. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in Bipolar Applications
OP AMP
INL (LSB)
DNL (LSB)
V
OS1
(mV)
V
OS1
1.2 (10V/V
REF
)
V
OS1
0.3 (10V/V
REF
)
I
B1
(nA)
I
B1
0.00055 (10V/V
REF
)
I
B1
0.00015 (10V/V
REF
)
A
VOL1
10k/A
VOL
V
OS2
(mV)
0
I
B2
(nA)
0
A
VOL2
0
BIPOLAR ZERO ERROR (LSB)
V
OS1
9.9 (10V/V
REF
)
I
B1
0.065 (10V/V
REF
)
0
V
OS2
6.7 (10V/V
REF
)
I
B2
0.065 (10V/V
REF
)
65k/A
VOL2
BIPOLAR GAIN ERROR (LSB)
V
OS1
6.9 (10V/V
REF
)
0
196k/A
VOL1
V
OS2
13.2 (10V/V
REF
)
I
B2
0.13 (10V/V
REF
)
131k/A
VOL2
3k/A
VOL1
0
0
0
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