数据搜索系统,热门电子元器件搜索 |
|
TC7652CPA 数据表(PDF) 4 Page - TelCom Semiconductor, Inc |
|
TC7652CPA 数据表(HTML) 4 Page - TelCom Semiconductor, Inc |
4 / 6 page 3-284 TELCOM SEMICONDUCTOR, INC. a 6dB/octave response from 0.1Hz to 2MHz, with phase shifts of less than 2 degrees in the transition region, where the main amplifier takes over from the null amplifier. Thermoelectric Effects The thermoelectric (Seebeck) effects in thermocouple junctions of dissimilar metals, alloys, silicon, etc. limit ultra- high-precision DC amplifiers. Unless all junctions are at the same temperature, thermoelectric voltages around 0.1 µV/ °C (up to tens of µV/°C for some materials) are generated. To realize the low offset voltages of the chopper, avoid temperature gradients. Enclose components to eliminate air movement, especially from power-dissipating elements in the system. Where possible, use low thermoelectric-coeffi- cient connections. Keep power supply voltages and power dissipation to a minimum. Use high-impedance loads and seek maximum separation from surrounding heat-dissipat- ing elements. Guarding To benefit from TC7652 low-input currents, take care assembling printed circuit boards. Clean boards with alco- hol or TCE, and blow dry with compressed air. To prevent contamination, coat boards with epoxy or silicone rubber. Even if boards are cleaned and coated, leakage cur- rents may occur because input pins are next to pins at supply potentials. To reduce this leakage, use guarding to lower the voltage difference between the inputs and adjacent metal runs. The guard (a conductive ring surrounding inputs) is connected to a low-impedance point at about the same voltage as inputs. The guard absorbs leakage currents from high-voltage pins. The 14-pin dual-in-line arrangement simplifies guard- ing. Like the LM108 pin configuration (but unlike the 101A and 741), pins next to inputs are not used. Pin Compatibility Where possible, the 8-pin device pinout conforms to such industry standards as the LM101 and LM741. Null- storing external capacitors connect to pins 1 and 8, which are usually for offset-null or compensation capacitors. Output clamp (pin 5) is similarly used. For OP05 and OP07 devices, replacement of the offset-null potentiometer (connected between pins 1 and 8 and VDD by two capacitors from those pins to VSS) provides compatibility. Replacing the compensation capacitor between pins 1 and 8 by two capacitors to VSS is required. The same operation (with the removal of any connection to pin 5) works for LM101, µA748, and similar parts. Because NC pins provide guarding between input and other pins, the 14-pin device pinout conforms closely to the LM108. Because this device does not use any extra pins and does not provide offset-nulling (but requires a compensation capacitor), some layout changes are necessary to convert to the TC7652. CONNECTION OF INPUT GUARDS INPUT OUTPUT R2 R1 Inverting Amplifier INPUT OUTPUT Follower INPUT OUTPUT R2 R1 Noninverting Amplifier TC7652 TC7652 TC7652 TC7652 LOW NOISE, CHOPPER-STABILIZED OPERATIONAL AMPLIFIER |
类似零件编号 - TC7652CPA |
|
类似说明 - TC7652CPA |
|
|
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 |