Post by thread:? Cheap serial 4 channel 8 bit A/D converter

Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or the high$ and I will need 4 channels. I want to be able to use the same code I developed for the LTC1298 (taking resolution into consideration). Any suggestions or cheaper solution. I may end up with the 16C71 and a serial EEprom, but I want to get all the code working using a 16F84 Jon

>Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been >practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or >the high$ and I will need 4 channels. I want to be able to use the same code I >developed for the LTC1298 (taking resolution into consideration). Any >suggestions or cheaper solution. I may end up with the 16C71 and a serial >EEprom, but I want to get all the code working using a 16F84 > >Jon > > Why don't you look at the PIC parts that have internal 8 bit A/Ds like the 16c7x series. Is speed an issue, and what type of speed do you need. Bob

On Thu, 12 Feb 1998 10:17:46 EST, "<Nichole Petty>" <spam_OUTPHXSYSTakeThisOuTAOL.COM> wrote: > Does Anyone know of a cheap 4 channel 8 bit A/D converter. Check out Maxim (http://www.maxim-ic.com). They give out free samples on request, and one of their chips (which I happen to have) is a serial, low power, eight channel 12 bit ADC. That chip is the MAX146 (2.7 - 3.6 volts) or the MAX 147 (2.7 - 5.25 volts). They have a whole pile of ADCs, in many configurations (channels/bits). If you only need one or two, it's hard to do better than free! :-) Later, Jon

On Thu, 12 Feb 1998 10:17:46 EST, you wrote: >Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been >practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or >the high$ and I will need 4 channels. I want to be able to use the same code I >developed for the LTC1298 (taking resolution into consideration). Any >suggestions or cheaper solution. I may end up with the 16C71 and a serial >EEprom, but I want to get all the code working using a 16F84 > >Jon I doubt you'll find anything cheaper than a 16C710/711. You could always use one with a small convert/send routine as a slave a/d converter while you develop the code on the 16F84. ____ ____ _/ L_/ Mike Harrison / White Wing Logic / .....wwlKILLspam@spam@netcomuk.co.uk _/ L_/ _/ W_/ Hardware & Software design / PCB Design / Consultancy _/ W_/ /_W_/ Industrial / Computer Peripherals / Hazardous Area /_W_/

On Fri, 13 Feb 1998 10:15:14 GMT, you wrote: >On Thu, 12 Feb 1998 10:17:46 EST, you wrote: > >>Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been >>practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or >>the high$ and I will need 4 channels. I want to be able to use the same code I >>developed for the LTC1298 (taking resolution into consideration). Any >>suggestions or cheaper solution. I may end up with the 16C71 and a serial >>EEprom, but I want to get all the code working using a 16F84 >> >>Jon >I doubt you'll find anything cheaper than a 16C710/711. You could >always use one with a small convert/send routine as a slave a/d >converter while you develop the code on the 16F84. P.S. have a look at the Philips PCF8591 - I2C 4-channel 8 bit adc and dac ____ ____ _/ L_/ Mike Harrison / White Wing Logic / wwlKILLspamnetcomuk.co.uk _/ L_/ _/ W_/ Hardware & Software design / PCB Design / Consultancy _/ W_/ /_W_/ Industrial / Computer Peripherals / Hazardous Area /_W_/

At 10:17 12/02/98 EST, you wrote: >Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been >practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or >the high$ and I will need 4 channels. I want to be able to use the same code I >developed for the LTC1298 (taking resolution into consideration). Any >suggestions or cheaper solution. I may end up with the 16C71 and a serial >EEprom, but I want to get all the code working using a 16F84 > >Jon > Hi Jon, I've purchased a TLC542 from Farnell (UK) at $3.3. It has 11 channels and 8 bits, and a 3-wire interface. It works fine!

part 0 475 bytes The TI part requires a data setup time of no less than 100ns before a rising clock edge. A TI application report has examples using SPI hardware in TI and Motorola micros. The PIC specification is for SDO data output valid 50ns after SCK edge. Has Microchip implemented SPI a little differently? Is it possible to have a TLC2543 working with PIC SPI hardware? The TI part looks to be very good value with a wide range of configurations. Comments appreciated. Peter Gilmour

National Semiconductor has the ADC0838 is 8-bit, 8-channel (or 4 channel differential), the ADC0834 is 8-bit, 4-channel. Price is cheap enough to buy them by the dozen. Adi > On Thu, 12 Feb 1998 10:17:46 EST, you wrote: > > >Does Anyone know of a cheap 4 channel 8 bit A/D converter. I have been > >practicing with a LTC1298 (12 bit 2 channel). I don't need the resolution or > >the high$ and I will need 4 channels. I want to be able to use the same code I > >developed for the LTC1298 (taking resolution into consideration). Any > >suggestions or cheaper solution. I may end up with the 16C71 and a serial > >EEprom, but I want to get all the code working using a 16F84

part 0 1277 bytes Someone else on the list suggested that I try changing the CKP in SSPCON to change the clock polarity between my transmitting the command to the LTC1298 and my reading the data from the LTC1298. It worked great. The PIC hardware isn't as flexible as say a 68HC11 with respect to clock polarities for SPI. Good luck, --Anil > {Original Message removed}

On Thu, 12 Feb 1998 10:17:46 EST, "<Nichole Petty>" <.....PHXSYSKILLspam.....AOL.COM> wrote: > Does Anyone know of a cheap 4 channel 8 bit A/D converter. 8 bit serial MC145041 or TLC542 10 bit serial MAX186 12 bit serial MAX192 Maxim have a wide range.

Russell McMahon wrote: > > On Thu, 12 Feb 1998 10:17:46 EST, "<Nichole Petty>" > <EraseMEPHXSYSspam_OUTTakeThisOuTAOL.COM> > wrote: > > > Does Anyone know of a cheap 4 channel 8 bit A/D converter. > > 8 bit serial MC145041 or TLC542 > 10 bit serial MAX186 > 12 bit serial MAX192 > > Maxim have a wide range. For free if you dont need more than 2 of a kind Hans

The MAX186 is a 12-Bit, 8-channel, serial A/D. I've used this chip in many projects. The MAX192 is a 10-Bit, 8-channel, serial A/D. - Tom At 12:25 AM 2/14/98 +1300, you wrote: {Quote hidden}>On Thu, 12 Feb 1998 10:17:46 EST, "<Nichole Petty>" ><PHXSYSspam_OUTAOL.COM> >wrote: > >> Does Anyone know of a cheap 4 channel 8 bit A/D converter. > > >8 bit serial MC145041 or TLC542 >10 bit serial MAX186 >12 bit serial MAX192 > >Maxim have a wide range. > >