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THS4521 Datasheet(PDF) 31 Page - Texas Instruments

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Part # THS4521
Description  VERY LOW POWER, NEGATIVE RAIL INPUT, RAIL-TO-RAIL OUTPUT, FULLY DIFFERENTIAL AMPLIFIER
PDF  43 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

THS4521 Datasheet(HTML) 31 Page - Texas Instruments

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ADC Driver Performance:
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
-160
0
10k
20k
30k
40k
50k
Frequency(Hz)
V =5.0V
G=1V/V
R =
1k
S
F
R =
Load=2x49.9
+2pF
G
W
W
10-kHzFFT
THS4521
ADS8321
V
OCM
5V
1nF
-IN
+IN
V
IN+
V
IN-
1kW
1kW
1kW
49.9 W
49.9 W
0.22 F
m
68pF
68pF
1kW
Open
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
-160
0
10k
20k
30k
40k
50k
Frequency(Hz)
V =5.0V
G=1V/V
R =
1k
S
F
R =
Load=2x49.9
+2pF
G
W
W
2-kHzFFT
THS4521
THS4522
THS4524
www.ti.com.................................................................................................................................................... SBOS458B – DECEMBER 2008 – REVISED MAY 2009
THS4521 and ADS8321 Combined
Performance
To
demonstrate
achievable
performance,
the
THS4521 is tested as the drive amplifier for the
ADS8321 16-bit SAR ADC. The ADS8321 offers
excellent ac and dc performance, with ultra-low power
and small size. The circuit shown in Figure 74 was
used to test the performance. Data were taken using
the ADS8321 at 100 kSPS with input frequencies of 2
kHz and 10 kHz and signal levels that were -0.5
dBFS.
FFT
plots
that
illustrate
the
spectral
performance are given in Figure 75 and Figure 76.
Tabulated ac analysis results are listed in Table 5.
Figure 76. 10-kHz FFT
Table 5. AC Analysis
Tone
Signal
SNR
THD
SINAD
SFDR
(Hz)
(dBFS)
(dBc)
(dBc)
(dBc)
(dBc)
2 k
–0.5
86.7
–97.8
86.4
100.7
10 k
–0.6
85.2
–98.1
85.2
102.2
Figure 74. THS4521 and ADS8321 Test Circuit
Figure 75. 2-kHZ FFT
Copyright © 2008–2009, Texas Instruments Incorporated
Submit Documentation Feedback
31
Product Folder Link(s): THS4521 THS4522 THS4524



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