数据搜索系统,热门电子元器件搜索 |
|
LTC2621 数据表(PDF) 18 Page - Linear Technology |
|
LTC2621 数据表(HTML) 18 Page - Linear Technology |
18 / 24 page LTC2753 18 2753f Op Amp Selection Because of the extremely high accuracy of the 16-bit LTC2753-16, 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 LTC2753’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 LTC2753-14 and the LTC2753-12. However, the results obtained from Tables 4 and 5 are in 16-bit LSBs. Divide these results by 4 (LTC2753-14) and 16 (LTC2753-12) to obtain the correct LSB sizing. Table 6 contains a partial list of LTC precision op amps recommended for use with the LTC2753. 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 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 0 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 0 0 DNL (LSB) () 5V VREF () 5V VREF A3 • VOS1 • 13.2 • IB1 • 0.13 • 0 0 0 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 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 1 10V 2.2 3 0.5 1.5 ±5V 2211 1.5 ±10V 4 4 0.83 1 2.5 ±2.5V 1 1 1.4 1 1 –2.5V to 7.5V 1.9 3 0.7 0.5 1.5 Table 6. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC2753 with Relevant Specifications AMPLIFIER AMPLIFIER SPECIFICATIONS VOS μV IB nA AVOL V/mV VOLTAGE NOISE nV/√⎯H⎯z CURRENT NOISE pA/√⎯H⎯z SLEW RATE V/μs GAIN BANDWIDTH PRODUCT MHz tSETTLING with LTC2753 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. |
类似零件编号 - LTC2621 |
|
类似说明 - LTC2621 |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |