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TLC7225CDWRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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TLC7225CDWRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page TLC7225C, TLC7225I QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION ground management and layout The TLC7225 contains four reference inputs that can be driven from ac sources (see multiplying DAC using ac input to the REF terminals section) so careful layout and grounding is important to minimize analog crosstalk between the four channels. The dynamic performance of the four DACs depends upon the optimum choice of board layout. Figure 6 shows the relationship between input frequency and channel-to-channel isolation. Figure 7 shows a printed circuit board layout that minimizes crosstalk and feedthrough. The four input signals are screened by AGND. Vref was limited between 2 V and 3.24 V to avoid slew-rate limiting effects from the output amplifier during measurements. – 80 – 70 – 60 – 50 – 40 – 30 20 k 50 k 100 k 200 k 500 k 1 M fI – Input Frequency – Hz TA = 25°C VDD = 15 V VSS = – 5 V Vref = 1.24 VPP – 20 10 k Figure 6. Channel-to-Channel Isolation MSB LSB Terminal 1 System GND OUTB OUTA VSS REFB REFA AGND DGND OUTC OUTD VDD REFC REFD Figure 7. Suggested PCB Layout (Top View) |
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