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參數(shù)資料
| 型號(hào)： | DC1684A-B |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/24頁 |
| 文件大小： | 0K |
| 描述： | BOARD DAC LTC2752 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC1684A Design File DC1684A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | QuikEval™, SoftSpan™ |
| DAC 的數(shù)量： | 2 |
| 位數(shù)： | 16 |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 設(shè)置時(shí)間： | 2µs |
| DAC 型： | 電流 |
| 工作溫度： | 0°C ~ 70°C |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC2752 |
| 相關(guān)產(chǎn)品： | DC590B-ND - BOARD DEMO USB SERIAL CONTROLLER LTC2752BILX#PBF-ND - IC DAC 16BIT DUAL CUR OUT 48LQFP LTC2752AILX#PBF-ND - IC DAC 16BIT DUAL CUR OUT 48LQFP LTC2752BCLX#PBF-ND - IC DAC 16BIT DUAL CUR OUT 48LQFP LTC2752ACLX#PBF-ND - IC DAC 16BIT DUAL CUR OUT 48LQFP |
LTC2752
0
2752f
applicaTions inForMaTion
Op Amp Selection
Because of the extremely high accuracy of the 16-bit
LTC2752, 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 ef-
fects of op amp parameters on the LTC2752’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.
Table 6 contains a partial list of Linear Technology preci-
sion op amps recommended for use with the LTC2752.
The easy-to-use design equations simplify the selection
of op amps to meet the system’s specified error budget.
Select the amplifier from Table 6 and insert the specified
op amp parameters in Table 5. Add up all the errors for
each category to determine 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.
Table 4. Coefficients for the Equations of Table 5
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
A3 VOS1 19.6
IB1 0.13
0
A4 VOS2 13.1
A4 IB2 0.13
A4
5V
VREF
5V
VREF
16.5
AVOL1
VOS1 (mV)
IB1 (nA)
AVOL1 (V/mV)
VOS2 (mV)
IB2 (nA)
AVOL2 (V/mV)
OP AMP
VOS1 3
IB1 0.0003
A1
0
INL (LSB)
5V
VREF
5V
VREF
1.5
AVOL1
66
AVOL2
131
AVOL1
131
AVOL1
131
AVOL2
131
AVOL2
VOS1 0.78
IB1 0.00008
A2
0
DNL (LSB)
5V
VREF
5V
VREF
A3 VOS1 13.1
IB1 0.13
0
UNIPOLAR
OFFSET (LSB)
5V
VREF
5V
VREF
5V
VREF
VOS1 13.1
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 13.1
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 LTC2752 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 LTC2752
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
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