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ADS8284IRGCR bảng dữ liệu(PDF) 4 Page - Texas Instruments |
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ADS8284IRGCR bảng dữ liệu(HTML) 4 Page - Texas Instruments |
4 / 46 page Not Recommended for New Designs ADS8284 SLAS628A – MARCH 2009 – REVISED APRIL 2014 www.ti.com Pin Functions PIN I/O DESCRIPTION NO NAME MULTIPLEXER INPUT PINS Non-inverting analog input for differential multiplexer channel number 0. Device performance is optimized for 50- Ω source 17 CH0P I impedance at this input. Inverting analog input for differential multiplexer channel number 0. Device performance is optimized for 50- Ω source 18 CH0M I impedance at this input. Non-inverting analog input for differential multiplexer channel number 1. Device performance is optimized for 50- Ω source 19 CH1P I impedance at this input. Inverting analog input for differential multiplexer channel number 1. Device performance is optimized for 50- Ω source 20 CH1M I impedance at this input. Non-inverting analog input for differential multiplexer channel number 2. Device performance is optimized for 50- Ω source 29 CH2P I impedance at this input. Inverting analog input for differential multiplexer channel number 2. Device performance is optimized for 50- Ω source 30 CH2M I impedance at this input. Non-inverting analog input for differential multiplexer channel number 3. Device performance is optimized for 50 ohm source 31 CH3P I impedance at this input. Inverting analog input for differential multiplexer channel number 3. Device performance is optimized for 50- Ω source 32 CH3M I impedance at this input. ADC INPUT PINS 25 INP I ADC Non inverting input., connect 1-nF capacitor across INP and INM 27 INM I ADC Inverting input, connect 1-nF capacitor across INP and INM REFERENCE INPUT/ OUTPUT PINS 8, 9 REFM I Reference ground. 10 REFIN I Reference Input. Add 0.1- μF decoupling capacitor between REFIN and REFM. 11 REFOUT O Reference Output. Add 1- μF capacitor between the REFOUT pin and REFM pin when internal reference is used. 14 VCMO O This pin outputs REFIN/2 and can be used to set common-mode voltage of differential analog inputs. 15 BUF-REF O Buffered reference output. Useful to level shift bipolar signals using external resistors. POWER CONTROL PINS 21 PD-RBUF I High on this pin powers down the reference buffer (BUF-REF). MULTIPLEXER CONTROL PINS 33 AUTO I High level on this pin selects auto mode for multiplexer scanning. Low level selects manual mode of multiplexer scanning In auto mode (AUTO = 1) multiplexer channel selection is reset to CH0 on rising edge of MXCLK while C3 = 1. The pin is do 34 C3 I not care in manual mode. Acts as multiplexer address bit when AUTO = 0 (manual mode). In auto mode (AUTO = 1) C2 and C1 select the last 35 C2 I multiplexer channel (channel count) in the auto scan sequence. Acts as multiplexer address LSB when AUTO = 0 (manual mode). In auto mode (AUTO = 1) C2 and C1 select the last 36 C1 I multiplexer channel (channel count) in the auto scan sequence. Multiplexer channel is selected on rising edge of MXCLK irrespective of whether it is auto or manual mode. Device BUSY 37 MXCLK I output can be connected to MXCLK so that device selects next channel at the end of every sample. ADC DATA BUS 8-BIT BUS 16-BIT BUS 18-BIT BUS 42-49, Data Bus BYTE = 0 BYTE = 1 BYTE = 1 BYTE = 0 BYTE = 0 BYTE = 0 52-61 BUS18/16 = 0 BUS18/16 = 0 BUS18/16 = 1 BUS18/16 = 0 BUS18/16 = 1 BUS18/16 = 0 42 DB17 O D17 (MSB) D9 All ones D17 (MSB) All ones D17 (MSB) 43 DB16 O D16 D8 All ones D16 All ones D16 44 DB15 O D15 D7 All ones D15 All ones D15 45 DB14 O D14 D6 All ones D14 All ones D14 46 DB13 O D13 D5 All ones D13 All ones D13 47 DB12 O D12 D4 All ones D12 All ones D12 48 DB11 O D11 D3 D1 D11 All ones D11 49 DB10 O D10 D2 D0 (LSB) D10 All ones D10 52 DB9 O D9 All ones All ones D9 All ones D9 53 DB8 O D8 All ones All ones D8 All ones D8 54 DB7 O D7 All ones All ones D7 All ones D7 55 DB6 O D6 All ones All ones D6 All ones D6 56 DB5 O D5 All ones All ones D5 All ones D5 4 Submit Documentation Feedback Copyright © 2009–2014, Texas Instruments Incorporated Product Folder Links: ADS8284 |
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