MX7575 MAXIM [Maxim Integrated Products], MX7575 Datasheet
MX7575
Available stocks
Related parts for MX7575
MX7575 Summary of contents
Page 1
... MX7575/MX7576 can be directly tied to a µP data bus or system l/O port. Maxim also makes the MAX165, a plug-in replacement for the MX7575 with an internal 1.23V reference. For applications that require a differential analog input and an internal reference, the MAX166 is recommended. ...
Page 2
... MX757_J/K ............................................................0°C to +70° 0.3V MX757_A/B ........................................................-25°C to +85° 0.3V MX757_JE/KE ....................................................-40°C to +85° 0.3V MX757_S/T.......................................................-55°C to +125°C DD Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering,10sec) ..............................+300°C = 4MHz external for MX7575; f CLK CONDITIONS MX757_K/B/T MX757_J/A/S MX757_K/B/T MX757_J/A/S 1LSB = 2V /256 REF MX7575 MX7575 2.46V ...
Page 3
... Note 1: Offset Error is measured with respect to an ideal first-code transition that occurs at 1/2LSB. Note 2: Sample tested at +25°C to ensure compliance. Note 3: Accuracy may degrade at conversion times other than those specified. Note 4: Power-supply current is measured when MX7575/MX7576 are inactive, i.e.: For MX7575 BUSY = high; For MX7576 BUSY = MODE = high. ...
Page 4
... Read Input. RD must be low to access data also used to start conversions. See the Microprocessor Interface section. TP Test Point. Connect to V (MX7575 MODE Mode Input. MODE = low puts the ADC into its asynchronous conversion mode. MODE has to be (MX7576) tied high for the synchronous conversion mode and the ROM interface mode. ...
Page 5
... Microprocessor Interface The CS and RD logic inputs are used to initiate conver- sions and to access data from the devices. The MX7575 and MX7576 have two common interface modes: slow- memory interface mode and ROM interface mode. In addition, the MX7576 has an asynchronous conversion ...
Page 6
... When using the 8085A-2, the earliest possible indication of an upcoming read operation is provided by the S0 status signal. Thus, S0, which is low for a read cycle, should be connected to the RD input of the MX7575/MX7576. Figure 4 shows the connection diagram for the 8085A-2 to the MX7575/MX7576 in slow-memory interface mode. ROM Interface Mode Figure 5 shows the timing diagram for ROM interface mode. In this mode, the µ ...
Page 7
... DB7 DATA BUS DB0 * SOME CIRCUITRY OMITTED FOR CLARITY Figure 8. MX7575/MX7576 to TMS32010 ROM Interface the µP, in that data can be accessed independently of the clock. The output latches are normally updated on the rising edge of BUSY. But if CS and RD are low when BUSY goes high, the data latches are not updat- ed until one of these inputs returns high ...
Page 8
... MX7575, the MX7576 samples the input volt- age eight times during a conversion (once before each comparator decision). Therefore, the precautions that apply to the MX7575 also apply to the MX7576. These include minimizing the analog source impedance and reducing noise coupling from the digital circuitry during a conversion, especially near a sampling instant ...
Page 9
... The duty cycle of the external clock may vary from 30% to 70%. As dis- 0.1 F cussed previously, in order to maintain accuracy, clock rates significantly lower than the data sheet limits (4MHz for MX7575 and 2MHz for MX7576) should not be used. Internal/External Clock Internal Clock , which ...
Page 10
... The output code provided by the MX7575 is offset binary. The ana- log input range for this circuit is ±2.46V (1LSB = 19.22mV), even though the voltage appearing at AIN is in the 0V to 2.46V range. In most cases, the MX7575 is 10 ______________________________________________________________________________________ OUTPUT ...
Page 11
... For PC board layouts, take care to keep digital lines well separated from any analog lines. Establish a sin- gle-point, analog ground (separate from the digital sys- tem ground) near the MX7575/MX7576. This analog ground point should be connected to the digital system ground through a single-track connection only. Any ...
Page 12
... Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1996 Maxim Integrated Products _Ordering Information (continued) PART MX7575JEWN MX7575KEWN MX7575JEQP MX7575KEQP AIN 18 MX7575SQ MX7575TQ AGND 17 MX7576JN ...