ADS6445 datasheet(49/75 Pages) STMICROELECTRONICS

Part #	ADS6445

Description	QUAD CHANNEL, 14-BIT, 125/105/80/65 MSPS ADC WITH SERIAL LVDS OUTPUTS

PDF	75 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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49 / 75 page

www.ti.com

INP

INM

VCM

1:1

5 W

25 W

5 W

0.1 F

TF_ADC

S0256-01

ADS6xxx

INP

INM

VCM

1:1

5 W

50 W

5 W

0.1

S0164-04

ADS6xxx

ADS6445, ADS6444

ADS6443, ADS6442

SLAS531 – MAY 2007

APPLICATION INFORMATION (continued)

Figure 85. Single Transformer Drive Circuit

At high input frequencies, the mismatch in the transformer parasitic capacitance (between the windings) results

in degraded even-order harmonic performance. Connecting two identical RF transformers back-to-back helps

minimize this mismatch, and good performance is obtained for high frequency input signals. Figure 86 shows an

example using two transformers (like Coilcraft WBC1-1). An additional termination resistor pair (enclosed within

the shaded box in Figure 86) may be required between the two transformers to improve the balance between

the P and M sides. The center point of this termination must be connected to ground.

Figure 86. Two Transformer Drive Circuit

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ADS6445 Datasheet(PDF) 49 Page - STMicroelectronics