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TLC2554IPWG4 Folha de dados(PDF) 4 Page - Texas Instruments |
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TLC2554IPWG4 Folha de dados(HTML) 4 Page - Texas Instruments |
4 / 50 page TLC2554, TLC2558 5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN SLAS220A –JUNE 1999 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 Terminal Functions (Continued) TERMINAL NAME NO. I/O DESCRIPTION NAME TLC2554 TLC2558 SDO 1 1 O The 3-state serial output for the A/D conversion result. SDO is kept in the high-impedance state when CS is high and after the CS falling edge and until the MSB (D15) is presented. The output format is MSB (D15) first. When FS is not used (FS = 1 at the falling edge of CS), the MSB (D15) is presented to the SDO pin after the CS falling edge, and successive data are available at the rising edge of SCLK. When FS is used (FS = 0 at the falling edge of CS), the MSB (D15) is presented to SDO after the falling edge of CS and FS = 0 is detected. Successive data are available at the falling edge of SCLK. (This is typically used with an active FS from a DSP.) For conversion and FIFO read cycles, the first 12 bits are the result from the previous conversion (data) followed by 4 trailing zeros. The first four bits from SDO for CFR read cycles should be ignored. The register content is in the last 12 bits. SDO is 3 stated after the 16th bit. REFM 14 18 I External reference input or internal reference decoupling. REFP 15 19 I External reference input or internal reference decoupling. (Shunt capacitors of 10 µF and 0.1 µF between REFP and REFM.) The maximum input voltage range is determined by the difference between the voltage applied to this terminal and the REFM terminal when an external reference is used. VCC 5 5 I Positive supply voltage detailed description analog inputs and internal test voltages The 4/8 analog inputs and three internal test inputs are selected by the analog multiplexer depending on the command entered. The input multiplexer is a break-before-make type to reduce input-to-input noise injection resulting from channel switching. pseudo-differential/single-ended input All analog inputs can be programmed as single-ended or pseudo-differential mode. Pseudo-differential mode is enabled by setting CFR.D7 – 1. Only three analog input channels (or seven channels for TLC2558) are available for TLV2554 since one input (A1 for TLC2554 or A2 for TLC2558) is used as the MINUS input when pseudo-differential mode is used. The minus input pin can have a maximum ±0.2 V ripple. This is normally used for ground noise rejection. converter The TLC2554/58 uses a 12-bit successive approximation ADC and 2-bit resistor string. The CMOS threshold detector in the successive-approximation conversion system determines each bit by examining the charge on a series of binary-weighted capacitors (see Figure 1). In the first phase of the conversion process, the analog input is sampled by closing the SC switch and all ST switches simultaneously. This action charges all the capacitors to the input voltage. |
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