전자부품 데이터시트 검색엔진 |
|
AD537KD 데이터시트(PDF) 5 Page - Analog Devices |
|
AD537KD 데이터시트(HTML) 5 Page - Analog Devices |
5 / 8 page AD537 REV. C –5– NONLINEARITY SPECIFICATION The preferred method for specifying linearity error is in terms of the maximum deviation from the ideal relationship after cali- brating the converter at full scale and “zero”. This error will vary with the full-scale frequency and the mode of operation. The AD537 operates best at a 10 kHz full-scale frequency with a negative voltage input; the linearity is typically within ±0.05%. Operating at higher frequencies or with positive inputs will degrade the linearity as indicates in the Specification table. The shape of a typical linearity plot is given in Figure 4. 0.18 0.04 0.10 0.06 10 0.08 1 0.16 0.12 0.14 10k 1k 100 OUTPUT FREQUENCY – Hz –0.08 –0.02 –0.06 –0.04 0 0.02 AD537J AD537K, S TEST CONDITIONS: +VS = +15V –VS = 0V CT = 0.01µF RT = 10kΩ VFS = ±10V POS INPUT – FIG. 3 NEG INPUT – FIG. 4 Figure 4a. Typical Nonlinearity Error Envelopes with 10 kHz F.S. Output 0.18 0.04 0.10 0.06 100 0.08 10 0.16 0.12 0.14 100k 10k 1k OUTPUT FREQUENCY – Hz –0.08 –0.02 –0.06 –0.04 0 0.02 AD537J AD537K, S TEST CONDITIONS: +VS = +15V –VS = 0V CT = 0.001µF RT = 10kΩ VFS = ±10V POS INPUT – FIG. 3 NEG INPUT – FIG. 4 Figure 4b. Typical Nonlinearity Error with 100 kHz F.S. Output OUTPUT INTERFACING CONSIDERATIONS The design of the output stage allows easy interfacing to all digi- tal logic families. The collector and emitter of the output NPN transistor are both uncommitted; the emitter can be tied to any voltage between –VS and 4 volts below +VS. The open collector can be pulled up to a voltage 36 volts above the emitter regard- less of +VS. The high power output stage can supply up to 20 mA (10 mA for “H” package) at a maximum saturation volt- age of 0.4 volts. The stage limits the output current at 25 mA; it can handle this limit indefinitely without damaging the device. Figure 5 shows the AD537 with a standard 0 to +10 volt input connection and the output stage connections. The values for the logic common voltage, pull-up resistor, positive logic level, and –VS supply are given in the accompanying chart for several logic forms. 1 2 14 13 5 6 7 10 9 8 3 4 12 11 AD537 C fOUT +VS (+15V) 10k VIN RL LOGIC VCC LOGIC COM VEE VOS 20k –VS TTL/DTL 5V CMOS 15V CMOS/ HNIL ECL 10k ECL2.5k PMOS VCC +5 +5 +15 0 +1.3 0 VEE GND GND GND –8 –2 –15 RL 5k 20k 10k 5k 5k 10k –VS GND GND GND –8 TO –15 –5 –15 BUF DRIVER CURR- TO-FREQ CONV PRECISION VOLTAGE REFERENCE VT VR Figure 5. Interfacing Standard Logic Families APPLICATIONS The diagrams and descriptions of the following applications are provided to stimulate the discerning engineer with alternative circuit design ideas. “Applications of the AD537 IC Voltage- to-Frequency Converter”, available from Analog Devices on request, covers a wider range of topics and concepts in data conversion and data transmission using voltage-to-frequency converters. TRUE TWO-WIRE DATA TRANSMISSION Figure 6 shows the AD537 in a true two-wire data transmission scheme. The twisted-pair transmission lines serves the dual pur- pose of supplying power to the device and also carrying fre- quency data in the form of current modulation. The PNP circuit at the receiving end represents a fairly simple way for converting the current modulation back into a voltage square wave which will drive digital logic directly. The 0.6 volt square wave which will appear on the supply line at the device terminals does not affect the performance of the AD537 because of its excellent supply rejection. Also, note that the circuit operates at nearly constant average power regardless of frequency. DRIVER CURR- TO-FREQ CONV PRECISION VOLTAGE REFERENCE VT VR BUF AD537 +VIN VTEMP VREF LOGIC GND +VS –VS (CONNECTED TO CASE) 10 9 8 7 6 5 4 3 2 1 RSCALE RCAL C TWO-WIRE LINK VS +5 +15 RS 0 1k RL 1k 3.3k 120 RS 220 Ω +VS OUTPUT RL VIN Figure 6. True Two-Wire Operation |
유사한 부품 번호 - AD537KD |
|
유사한 설명 - AD537KD |
|
|
링크 URL |
개인정보취급방침 |
ALLDATASHEET.CO.KR |
ALLDATASHEET 가 귀하에 도움이 되셨나요? [ DONATE ] |
Alldatasheet는? | 광고문의 | 운영자에게 연락하기 | 개인정보취급방침 | 링크교환 | 제조사별 검색 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 |