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ADS7886SDCKR Datasheet(PDF) 6 Page - Texas Instruments |
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ADS7886SDCKR Datasheet(HTML) 6 Page - Texas Instruments |
6 / 24 page 3 2 4 6 1 VDD GND VIN CS SCLK SDO 5 1 2 4 5 6 14 15 CS SCLK SDO 0 0 0 D11 D10 D3 D2 13 D1 D0 16 t d1 td2 t h1 tconv 1/throughput tq td3 tw1 b tsu1 a ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com DEVICE INFORMATION SOT23/SC70 PACKAGE (TOP VIEW) TERMINAL FUNCTIONS TERMINAL I/O DESCRIPTION NAME NO. VDD 1 – Power supply input also acts like a reference voltage to ADC. GND 2 – Ground for power supply, all analog and digital signals are referred with respect to this pin. VIN 3 I Analog signal input SCLK 4 I Serial clock SDO 5 O Serial data out CS 6 I Chip select signal, active low NORMAL OPERATION The cycle begins with the falling edge of CS. This point is indicated as a in Figure 1. With the falling edge of CS, the input signal is sampled and the conversion process is initiated. The device outputs data while the conversion is in progress. The data word contains 4 leading zeros, followed by 12-bit data in MSB first format. The falling edge of CS clocks out the first zero, and a zero is clocked out on every falling edge of the clock until the third edge. Data is in MSB first format with the MSB being clocked out on the 4th falling edge. On the 16th falling edge of SCLK, SDO goes to the 3-state condition. The conversion ends on the 16th falling edge of SCLK. The device enters the acquisition phase on the first rising edge of SCLK after the 13th falling edge. This point is indicated by b in Figure 1. CS can be asserted (pulled high) after 16 clocks have elapsed. It is necessary not to start the next conversion by pulling CS low until the end of the quiet time (tq) after SDO goes to 3-state. To continue normal operation, it is necessary that CS is not pulled high until point b. Without this, the device does not enter the acquisition phase and no valid data is available in the next cycle. (Also refer to power down mode for more details.) CS going high any time after the conversion start aborts the ongoing conversion and SDO goes to 3-state. The high level of the digital input to the device is not limited to device VDD. This means the digital input can go as high as 5.25 V when the device supply is 2.35 V. This feature is useful when digital signals are coming from another circuit with different supply levels. Also, this relaxes the restriction on power up sequencing. However, the digital output levels (VOH and VOL) are governed by VDD as listed in the Electrical Characteristics table. Figure 1. Interface Timing Diagram 6 Submit Documentation Feedback Copyright © 2005–2009, Texas Instruments Incorporated Product Folder Link(s): ADS7886 |
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