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| 型号： | DC1110A |
| 厂商： | Linear Technology |
| 文件页数： | 8/22页 |
| 文件大小： | 0K |
| 描述： | BOARD DAC LTC2751-16 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1110A Design File DC1110A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™, SoftSpan™ |
| DAC 的数量： | 1 |
| 位数： | 16 |
| 数据接口： | 并联 |
| 设置时间： | 2µs |
| DAC 型： | 电流 |
| 工作温度： | 0°C ~ 70°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC2751-16 |
| 相关产品： | DC590B-ND - BOARD DEMO USB SERIAL CONTROLLER LTC2751BIUHF-16#TRPBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751BIUHF-16#PBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751BCUHF-16#TRPBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751BCUHF-16#PBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751AIUHF-16#TRPBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751AIUHF-16#PBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751ACUHF-16#TRPBF-ND - IC DAC 16BIT CUR OUT 38-QFN LTC2751ACUHF-16#PBF-ND - IC DAC 16BIT CUR OUT 38-QFN |
LTC2751
16
2751fa
Op Amp Selection
Because of the extremely high accuracy of the 16-bit
LTC2751-16, 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 3 and 4 contain equations for evaluating the ef-
fects of op amp parameters on the LTC2751’s accuracy
applicaTions inForMaTion
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 3 and 4 can also be used
to determine the effects of op amp parameters on the
LTC2751-14 and the LTC2751-12. However, the results
obtained from Tables 3 and 4 are in 16-bit LSBs. Divide
these results by 4 (LTC2751-14) and 16 (LTC2751-12) to
obtain the correct LSB sizing.
Table 5 contains a partial list of LTC precision op amps
recommended for use with the LTC2751. The easy-to-use
designequationssimplifytheselectionofopampstomeet
the system’s specified error budget. Select the amplifier
from Table 5 and insert the specified op amp parameters
in Table 4. 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.
( )
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
A3 VOS1 19.8
IB1 0.13
0
A4 VOS2 13.1
A4 IB2 0.13
A4
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 3. Variables for Each Output Range That Adjust the
Equations in Table 4
OUTPUT RANGE
A1
A2
A3
A4
A5
5V
1.1
2
1
10V
2.2
3
0.5
1.5
±5V
2
1
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 5. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC2751 with Relevant Specifications
AMPLIFIER
AMPLIFIER SPECIFICATIONS
VOS
V
IB
nA
AVOL
V/mV
VOLTAGE
NOISE
nV/√Hz
CURRENT
NOISE
pA/√Hz
SLEW
RATE
V/s
GAIN BANDWIDTH
PRODUCT
MHz
tSETTLING
with
LTC2751
s
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 4. 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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