THS4532IPWR datasheet(38/44 Pages) TI

38 / 44 page

−140

−130

−120

−110

−100

−90

−80

−70

−60

−50

−40

−30

−20

−10

10k

100k

Frequency (Hz)

VS = 5 V

G = 1 V/V

RF = 2 kΩ

VOUT = −0.5 dBFS

G077

2 k

0.22 F

5 V

THS4532

VOUT+

40.2

VOUT±

40.2

Differential

Signal from

Generator and

10 kHz BPF

VIN+

VIN±

VOCM

2 k

1 nF

2 k

To Data

Analysis

ADS7945

100 pF

THS4532

SLOS829 – FEBRUARY 2013

www.ti.com

The standard ADS7945 EVM and THS4532 EVM are modified to implement the schematic in Figure 95 and used

to test the performance of the THS4532 as a drive amplifier. With single supply +5V supply the output common-

mode of the THS4532 defaults to +2.5V as required at the input of the ADS7945 so the VOCM input of the

THS4532 simply bypassed to GND with 0.22µF capacitor. The summary of results of the FFT analysis versus

typical data sheet performance shown in Table 6 show the THS4532 will make an excellent drive amplifier for

this ADC.

Figure 95. THS4532 and ADS7945 Test Circuit

Figure 96. THS4532 and ADS7945 Test Circuit

Table 6. 10kHz FFT Analysis Summary

CONFIGURATION

TONE

SIGNAL

SNR

THD

SFDR

THS4532 + ADS7945

10kHz

-0.5 dBFS

83 dBc

-93 dBc

96 dBc

ADS7945 Data Sheet (typ)

10kHz

-0.5 dBFS

84 dBc

-92 dBc

94 dBc

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