The design of a new Digital Programmable Transconductance Amplifier (TD-DPTA) for Cellular Neural Networks will be shown in the paper. The proposed approach is based on a time division strategy with the main goal of a reduction of the area by the minimization of the number of the analogue multipliers inside each cell. So, the new CNN cell will be composed of a single TD-DPTA only, which will be able to feed the whole neighbourhood by the proper weighted current contribution by using a time division approach. The paper presents the design of a new DPTA architecture as well as a multiplexer circuit tailored for this particular application.