ADS5474IPFPR datasheet(19/41 Pages) TI1

19 / 41 page

500 W

Buffer

VCM

Buffer

1.6 pF

1.6pF

GND

S0293-01

AIN

AVDD5

ADS5463/5474/54RF63

GND

~ 2.5 nH Bond Wire

~ 0.5pF

Package

~ 0.5pF

Package

~ 200fF

BondPad

~ 200fF

BondPad

ADS5474

www.ti.com

SLAS525C – JULY 2007 – REVISED JANUARY 2016

Feature Description (continued)

Figure 34. Analog Input Equivalent Circuit

For a full-scale differential input, each of the differential lines of the input signal (pins 16 and 17) swings

symmetrically between (3.1 V + 0.55 V) and (3.1 V – 0.55 V). This range means that each input has a maximum

signal swing of 1.1 VPP for a total differential input signal swing of 2.2 VPP. Operation below 2.2 VPP is allowable,

with the characteristics of performance versus input amplitude demonstrated in Figure 18 and Figure 19. For

instance, for performance at 1.1 VPP rather than 2.2 VPP, refer to the SNR and SFDR at –6 dBFS (0 dBFS =

2.2 VPP). The maximum swing is determined by the internal reference voltage generator, eliminating the need for

any external circuitry for this purpose.

7.3.1 Clock Inputs

The ADS5474 device clock input can be driven with either a differential clock signal or a single-ended clock

input. The characterization of the ADS5474 device is typically performed with a 3-VPP differential clock, but the

ADC performs well with a differential clock amplitude down to approximately 0.5 VPP, as shown in Figure 37. The

clock amplitude becomes more of a factor in performance as the analog input frequency increases. In low-input-

frequency applications, where jitter may not be a big concern, the use of a single-ended clock could save cost

and board space without much performance tradeoff. When clocked with this configuration, it is best to connect

CLK to ground with a 0.01-

μF capacitor, while CLK is ac-coupled with a 0.01-μF capacitor to the clock source, as

shown in Figure 36.

Submit Documentation Feedback

Product Folder Links: ADS5474

ADS5474IPFPR Datasheet(PDF) 19 Page - Texas Instruments

ADS5474IPFPR Datasheet(HTML) 19 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

Datasheet Download

Link URL