---- START NEW MESSAGE --- Received: from cherry.ease.lsoft.com [209.119.0.109] by dpmail10.doteasy.com with ESMTP (SMTPD32-8.05) id A5EE2F93006C; Sun, 01 Feb 2004 02:33:18 -0800 Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <19.00CC75AE@cherry.ease.lsoft.com>; 1 Feb 2004 5:33:08 -0500 Received: from MITVMA.MIT.EDU by MITVMA.MIT.EDU (LISTSERV-TCP/IP release 1.8e) with spool id 6790 for PICLIST@MITVMA.MIT.EDU; Sun, 1 Feb 2004 05:33:02 -0500 Received: from MITVMA (NJE origin SMTP@MITVMA) by MITVMA.MIT.EDU (LMail V1.2d/1.8d) with BSMTP id 4101; Sun, 1 Feb 2004 05:31:02 -0500 Received: from albatross-ext.wise.edt.ericsson.se [193.180.251.49] by mitvma.mit.edu (IBM VM SMTP Level 430) via TCP with ESMTP ; Sun, 01 Feb 2004 05:31:02 EST X-Comment: mitvma.mit.edu: Mail was sent by albatross-ext.wise.edt.ericsson.se Received: from esealmw143.al.sw.ericsson.se ([153.88.254.118]) by albatross-ext.wise.edt.ericsson.se (8.12.10/8.12.10/WIREfire-1.8b) with ESMTP id i11AV3qY005667 for ; Sun, 1 Feb 2004 11:31:03 +0100 (MET) Received: from esealnt612.al.sw.ericsson.se ([153.88.254.118]) by esealmw143.al.sw.ericsson.se with Microsoft SMTPSVC(6.0.3790.0); Sun, 1 Feb 2004 11:31:20 +0100 Received: by esealnt612.al.sw.ericsson.se with Internet Mail Service (5.5.2657.72) id <1CVTGYW3>; Sun, 1 Feb 2004 11:30:48 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2657.72) Content-Type: text/plain X-OriginalArrivalTime: 01 Feb 2004 10:31:20.0207 (UTC) FILETIME=[881D21F0:01C3E8AE] Message-ID: <37FB7AA6F5F9814FB634A7BF4C35A6F5640D0B@ESEALNT442.al.sw.ericsson.se> Date: Sat, 31 Jan 2004 17:49:09 +0100 Reply-To: pic microcontroller discussion list Sender: pic microcontroller discussion list From: "Jan-Erik Soderholm XA (TN/PAC)" Subject: Re: [PIC:] 16LF877A A/D To: PICLIST@MITVMA.MIT.EDU Precedence: list X-RCPT-TO: Status: U X-UIDL: 371856744 James Nick Sears wrote : > From what I can see in the datasheet, in theory anyway, > the performance should not decline with a longer Tad so > I am curious. See figure 11-2 on page 128 in the data sheet. The C-hold capacitor will first be charged to the input voltage ("acquisition"). Then it's disconected from the inpout pin via the SS-switch and the AD-conversion starts. During the conversion, the C-hold cap is slowly discharged due to internal leakage, and a "too long" conversion time will introduce errors. Jan-Erik. This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you. E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads .