ADS6444IRGCT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ADS6444IRGCT

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

STMicroelectronics 

www.ti.com

APPLICATION INFORMATION (continued)

ADS6445, ADS6444

ADS6443, ADS6442

SLAS531 – MAY 2007

0.1 mF

TF_ADC

5W

0.1 mF

25 W

25 W

1:1

5W

ADS6xxx

INP

INM

VCM

S0256-01

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.

0.1 mF

50 W

5W

0.1 mF

50 W

ADS6xxx

INP

50 W

50 W

INM

1:1

1:1

5W

VCM

S0164-04

Figure 86. Two Transformer Drive Circuit

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