Return-Path: Received: (qmail 2684 invoked from network); 27 Apr 2001 13:41:35 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by 10.226.25.101 with SMTP; 27 Apr 2001 13:41:35 -0000 Received: (qmail 20551 invoked from network); 27 Apr 2001 13:41:34 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 27 Apr 2001 13:41:34 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #2) id 14t8O3-0001Ub-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 27 Apr 2001 14:34:19 +0100 X-Priority: 3 Received: from bob.dera.gov.uk ([192.5.29.90]) by post.thorcom.com with esmtp (Exim 3.16 #2) id 14t8Nw-0001UW-00 for rsgb_lf_group@blacksheep.org; Fri, 27 Apr 2001 14:34:13 +0100 X-MSMail-Priority: Normal Received: by bob.dera.gov.uk; (8.8.8/1.3/10May95) id OAA16933; Fri, 27 Apr 2001 14:37:23 +0100 (BST) Received: (qmail 10625 invoked from network); 27 Apr 2001 14:27:58 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from gauntlet.mail.dera.gov.uk (172.16.9.10) by baton.dera.gov.uk with SMTP; 27 Apr 2001 14:27:58 -0000 Received: by gauntlet.mail.dera.gov.uk; id OAA01264; Fri, 27 Apr 2001 14:24:26 GMT Received: from unknown(10.71.64.31) by gauntlet.mail.dera.gov.uk via smap (3.2) id xma001251; Fri, 27 Apr 01 14:24:05 GMT Received: from FRN-MAIL-3.dera.gov.uk (unverified) by mailguard.dera.gov.uk (Content Technologies SMTPRS 4.1.5) with ESMTP id ; Fri, 27 Apr 2001 14:40:29 +0100 Received: by frn-mail-3.dera.gov.uk with Internet Mail Service (5.5.2650.21) id ; Fri, 27 Apr 2001 14:33:10 +0100 Message-ID: <65AECDF1F89AD411900400508BFC869F9C046A@pdw-mail-1.dera.gov.uk> From: "Talbot Andrew" To: "LF Group \(E-mail\)" , "KZY \(E-mail\)" Subject: LF: New DDS Chips Date: Fri, 27 Apr 2001 14:33:24 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2650.21) Content-Type: text/html; charset=windows-1252 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit

HF Instruments now have a limited number of AD9851 DDS Chips. These are functionally similar to and have the same connections as the AD9850 as used in my DDS module, and are backward compatible with it for commands but can be used at a higher clock rate, up to 180MHz.

The AD9851 includes an optional on chip X6 PLL multiplier so the actual clock oscillator need only be up to 30MHz rather than finding TTL oscillators up to the full clock rate. The data sheet states that the added phase noise due to the PLL is 'not noticable'

The chips are available on a first come first served basis at £29 each from HF Instruments. Bare boards are also available at £8 each (but the chips cannot be supplied alread mounted).

Please note also that HF Instruments are no longer able to take credit card orders, only cheques or similar can be accepted. WWW.HF-INST.CO.UK

Andy G4JNT





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