công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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M-8870-01SMTR bảng dữ liệu(PDF) 5 Page - Clare, Inc. |
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M-8870-01SMTR bảng dữ liệu(HTML) 5 Page - Clare, Inc. |
5 / 9 page Tone Decoding FLOW FHIGH Key (ref.) OE Q4 Q3 Q2 Q1 697 1209 1 H 0 0 0 1 697 1336 2 H 0 0 1 0 697 1477 3 H 0 0 1 1 770 1209 4 H 0 1 0 0 770 1336 5 H 0 1 0 1 770 1477 6 H 0 1 1 0 852 1209 7 H 0 1 1 1 852 1336 8 H 1 0 0 0 852 1477 9 H 1 0 0 1 941 1336 0 H 1 0 1 0 941 1209 S H 1 0 1 1 941 1477 # H 1 1 0 0 697 1633 A H 1 1 0 1 770 1633 B H 1 1 1 0 852 1633 C H 1 1 1 1 941 1633 D H 0 0 0 0 ANY ANY ANY L Z Z Z Z L = logic low, H = logic high, Z = high impedance M-8870 www.clare.com 5 Rev. 3 Differential Input Configuration Common Crystal Connection stops the oscillator and the functioning of the filters. On the M-8870-01 models, this pin is tied to ground (logic low). Inhibit mode is enabled by a logic high input to pin 5 (INH). It inhibits the detection of 1633 Hz. The output code will remain the same as the previous detected code (see Pin functions table on page 4). On the M- 8870-01 models, this pin is tied to ground (logic low). Input Configuration The input arrangement of the M-8870 provides a dif- ferential input operational amplifier as well as a bias source (V REF) to bias the inputs at mid-rail. Provision is made for connection of a feedback resistor to the op-amp output (GS) for gain adjustment. In a single-ended configuration, the input pins are connected as shown in the Single - Ended Input Configuration on page 3 with the op-amp connected for unity gain and V REF biasing the input at 1/2VDD. The Differential Input Configuration bellow permits gain adjustment with the feedback resistor R 5. DTMF Clock Circuit The internal clock circuit is completed with the addition of a standard 3.579545 MHz television color burst crys- tal. The crystal can be connected to a single M-8870 as shown in the Single - Ended Input Configuration on page 3, or to a series of M-8870s. As illustrated in the Common Crystal Connection below, a single crystal can be used to connect a series of M-8870s by cou- pling the oscillator output of each M-8870 through a 30 pF capacitor to the oscillator input of the next M-8870. |
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Mô tả tương tự - M-8870-01SMTR |
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