R

50

0

W

Z

50

0

W

ADS5463

AIN

AIN

S0176-03

R

200 W

ACSignal

Source

Mini-Circuits

JTX-4-10T

ADS5463

THS9001

AIN

AIN

VIN

VIN

THS9001

S0177-03

1000pF

1000pF

39pF

50 W

50 W

0.1 F

m

1000pF

1000pF

18 H

m

18pF

AIN

AIN

VREF

ADS5463

+5V

THS4509

CM

348 W

348 W

100 W

100 W

78.9 W

78.9 W

49.9 W

VIN

From

50

Source

W

49.9 W

49.9 W

49.9 W

0.1 F

m

0.1 F

m

0.22 F

m

0.22 F

m

0.22 F

m

S0193-02

ADS5463

ADS54RF63

www.ti.com ................................................................................................................................................... SLAS515E – NOVEMBER 2006 – REVISED JULY 2009

The ADS5463/ADS54RF63 obtains optimum performance when the analog inputs are driven differentially. The

circuit in Figure 49 shows one possible configuration using an RF transformer with termination either on the

primary or on the secondary of the transformer. In addition, the evaluation module is configured with two

back-to-back transformers, which also demonstrates good performance. If voltage gain is required, a step-up

transformer can be used.

Figure 49. Converting a Single-Ended Input to a Differential Signal Using an RF Transformer

In addition to the transformer configurations, an RF gain-block amplifier, such as the Texas Instruments

THS9001, can also be used for high-input-frequency applications. For large voltage gains at intermediate

frequencies in the 50-MHz – 350-MHz range, the configuration shown in Figure 50 can be used. The component

values can be tuned for different intermediate frequencies. The example shown is located on the evaluation

module and is tuned for an IF of 170 MHz. More information regarding this configuration can be found in the

ADS5463 EVM User Guide (SLAU194) and the THS9001 50 MHz to 350 MHz Cascadeable Amplifier data sheet

(SLOS426).

Figure 50. Using the THS9001 IF Amplifier with the ADS5463/ADS54RF63

Figure 51. Using the THS4509 with the ADS5463/ADS54RF63

Copyright © 2006–2009, Texas Instruments Incorporated

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