Datasheet

THS4521 ADS8321
V
OCM
5V
1nF
-IN
+IN
V
IN+
V
IN-
1kW
1kW
1kW
49.9 W
49.9 W
0.22 Fm
68pF
68pF
1kW
Open
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
-160
Magnitude (dBFS)
0 10 k 20 k 30 k 40 k 50 k
Frequency (Hz)
V = 5.0 V
G = 1 V/V
R = 1 k
S
F
R =
Load = 2 x 49.9 + 2 pF
G
W
W
10-kHz FFT
0
20
40
60
80
100
120
140
-
-
-
-
-
-
-
-160
Magnitude (dBFS)
0 10 k 20 k 30 k 40 k 50 k
Frequency (Hz)
V = 5.0 V
G = 1 V/V
R = 1 k
S
F
R =
Load = 2 x 49.9 + 2 pF
G
W
W
2-kHz FFT
THS4521
THS4522
THS4524
www.ti.com
SBOS458F DECEMBER 2008REVISED SEPTEMBER 2011
ADC Driver Performance: Data were taken using the ADS8321 at 100 kSPS
THS4521 and ADS8321 Combined with input frequencies of 2 kHz and 10 kHz and
Performance signal levels that were -0.5 dBFS. FFT plots that
illustrate the spectral performance are given in
To demonstrate achievable performance, the
Figure 85 and Figure 86. Tabulated ac analysis
THS4521 is tested as the drive amplifier for the
results are listed in Table 7 and compared to the
ADS8321 16-bit SAR ADC. The ADS8321 offers
ADS8321 data sheet typical performance.
excellent ac and dc performance, with ultra-low power
and small size. The circuit shown in Figure 84 was
used to test the performance.
Figure 84. THS4521 and ADS8321 Test Circuit
Figure 85. 2-kHZ FFT Figure 86. 10-kHz FFT
Table 7. AC Analysis
Configuration Tone Signal (dBFS) SNR (dBc) THD (dBc) SINAD (dBc) SFDR (dBc)
THS4521 and 2 kHz 0.5 86.7 97.8 86.4 100.7
ADS8321
10 kHz 0.5 85.2 98.1 85.2 102.2
ADS8321 Data
10 kHz 0.5 87 86 84 86
sheet (typ)
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