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參數(shù)資料
| 型號： | DC1112A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DAC LTC2755-16 |
| 軟件下載： | QuikEval System |
| 設(shè)計資源： | DC1112A Design File DC1112A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval™, SoftSpan™ |
| DAC 的數(shù)量： | 4 |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 設(shè)置時間： | 2µs |
| DAC 型： | 電流 |
| 工作溫度： | 0°C ~ 70°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC2755-16 |
| 相關(guān)產(chǎn)品： | DC590B-ND - BOARD DEMO USB SERIAL CONTROLLER LTC2755BIUP-16#TRPBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755BIUP-16#PBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755BCUP-16#TRPBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755BCUP-16#PBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755AIUP-16#TRPBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755AIUP-16#PBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755ACUP-16#TRPBF-ND - IC DAC 16BIT CUR OUT 64-QFN LTC2755ACUP-16#PBF-ND - IC DAC 16BIT CUR OUT 64-QFN |
LTC2755
18
2755f
Op Amp Selection
Because of the extremely high accuracy of the 16-bit
LTC2755-16, 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 LTC2755’s accuracy when
APPLICATIONS INFORMATION
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 LTC2755-14
and the LTC2755-12. However, the results obtained from
Tables 4 and 5 are in 16-bit LSBs. Divide these results
by 4 (LTC2755-14) and 16 (LTC2755-12) to obtain the
correct LSB sizing.
Table 6 contains a partial list of LTC precision op amps
recommended for use with the LTC2755. The easy-to-use
design equations simplify the selection of op amps to meet
the system’s specied error budget. Select the amplier
from Table 6 and insert the specied op amp parameters
in Table 5. Add up all the errors for each category to de-
termine the effect the op amp has on the accuracy of the
part. Arithmetic summation gives an (unlikely) worst-case
effect. A root-sum-square (RMS) summation produces a
more realistic estimate.
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
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
DNL (LSB)
()
5V
VREF
()
5V
VREF
A3 VOS1 13.2
IB1 0.13
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 4. Variables for Each Output Range that Adjust the
Equations in Table 5
OUTPUT RANGE
A1
A2
A3
A4
A5
5V
1.1
2
1
10V
2.2
3
0.5
1.5
±5V
2211
1.5
±10V
4
0.83
1
2.5
±2.5V
1
1.4
1
–2.5V to 7.5V
1.9
3
0.7
0.5
1.5
Table 6. Partial List of LTC Precision Ampliers Recommended for Use with the LTC2755 with Relevant Specications
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
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.
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