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參數(shù)資料
| 型號： | LTC2758AILX#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DAC 18BIT SPI/SRL 48-LQFP |
| 標(biāo)準(zhǔn)包裝： | 250 |
| 系列： | SoftSpan™ |
| 設(shè)置時間： | 2.1µs |
| 位數(shù)： | 18 |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-LQFP |
| 供應(yīng)商設(shè)備封裝： | 48-LQFP（7x7） |
| 包裝： | 管件 |
| 輸出數(shù)目和類型： | 2 電流，單極；4 電流，雙極 |
| 配用： | DC1684A-A-ND - BOARD DAC LTC2758 |
LTC2758
18
2758fa
For more information www.linear.com/LTC2758
Op Amp Selection
Because of the extremely high accuracy of the 18-bit
LTC2758, 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 LTC2758’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.
APPLICATIONS INFORMATION
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 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
Table 6 contains a partial list of LTC precision op amps
recommended for use with the LTC2758. The easy-to-use
designequationssimplifytheselectionofopampstomeet
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 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.
A3VOS178.6
IB10.524
0
A4VOS252.4
A4IB20.524
A4
( )
5V
VREF
( )
5V
VREF
( )
66
AVOL1
OP AMP
VOS1 (mV)
IB1 (nA)
AVOL1 (V/mV)
VOS2 (mV)
IB2 (nA)
AVOL2 (V/mV)
VOS112.1
IB10.0012
A1
0
INL (LSB)
( )
5V
VREF
( )
5V
VREF
( )
6
AVOL1
( )
262
AVOL2
( )
524
AVOL1
( )
524
AVOL1
( )
524
AVOL2
( )
524
AVOL2
VOS13.1
IB10.00032
A2
0
DNL (LSB)
( )
5V
VREF
( )
5V
VREF
A3VOS152.4
IB10.524
0
UNIPOLAR
OFFSET (LSB)
( )
5V
VREF
( )
5V
VREF
( )
5V
VREF
VOS152.4
IB10.0072
A5
VOS2104.8
IB21.048
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
VOS152.4
IB10.0072
A5
VOS2104.8
IB21.048
Table 6. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC2758 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 LTC2758
s
POWER
DISSIPATION
mW
LTC1150
10
0.05
5600
90
0.0018
3
2.5
10ms
24
LT1001
25
2
800
10
0.12
0.25
0.8
120
46
LT1012
25
0.1
2000
14
0.02
0.2
1
120
11.4
LT1097
50
0.35
2500
14
0.008
0.2
0.7
120
11
LT1468
75
10
5000
5
0.6
22
90
2.1
117
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