ADS7253 datasheet(57/73 Pages) TI2

部件名	ADS7253

功能描述	ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters

PDF	73 Pages

Scroll/Zoom	100%

制造商	TI2 [Texas Instruments]

网页	https://www.ti.com

标志

57 / 73 page

AVDD (pin 14)

GND (pin 13)

DVDD (pin 7)

AVDD

DVDD

10 2F

ADS8354, ADS7854, ADS7254

www.ti.com

SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014

10 Power-Supply Recommendations

The devices have two separate power supplies: AVDD and DVDD. The device operates on AVDD; DVDD is

used for the interface circuits. AVDD and DVDD can be independently set to any value within the permissible

ranges.

When using the device with ±2 × VREF input range (CFR.B9 = 1), the AVDD supply voltage value defines the

permissible voltage swing on the analog input pins. To avoid saturation of output codes, and to use the full

dynamic range on the analog input pins, AVDD must be set as shown in Equation 11, Equation 12, and

Equation 13:

AVDD

≥ 2 × VREF_A

(11)

AVDD

≥ 2 × VREF_B

(12)

4.75 V

≤ AVDD ≤ 5.25 V

(13)

Decouple the AVDD and DVDD pins with the GND pin using individual 10-µF decoupling capacitors, as shown in

Figure 115.

Figure 115. Power-Supply Decoupling

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Product Folder Links: ADS8354 ADS7854 ADS7254

ADS7253 数据表(PDF) 57 Page - Texas Instruments