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THS4521 ADS1278 (CH1)
V
OCM
5V
V
COM
2.2nF
AINN1
AINP1
x1
1/2
OPA2350
1.5nF
1.5nF
V
IN+
V
IN-
1kW
1kW
1kW
49.9 W
49.9 W
0.1 Fm
0.1 Fm
1kW
0
20
40
60
80
100
120
140
160
-
-
-
-
-
-
-
-
Magnitude (dBFS)
0
4
8
12
16 20
24
26
Frequency (kHz)
10-kHz FFT
G = 1
R = R = 1 k
C = 1.5 nF
V = 5 V
Load = 2 x 49.9 + 2.2 nF
F G
F
S
W
W
0
20
40
60
80
100
120
140
160
-
-
-
-
-
-
-
-
Magnitude (dBFS)
0
4
8
12
16 20
24
26
Frequency (kHz)
1-kHz FFT
G = 1
R = R = 1 k
C = 1.5 nF
V = 5 V
Load = 2 x 49.9 + 2.2 nF
F G
F
S
W
W
THS4521
THS4522
THS4524
SBOS458F –DECEMBER 2008–REVISED SEPTEMBER 2011
www.ti.com
ADC Driver Performance:
modes from 10 kSPS to 128 kSPS to enable the user
THS4521 and ADS1278 Combined
to fine-tune performance and power for specific
Performance
application needs. The circuit shown in Figure 81 was
The THS4521 provides excellent performance when used to test the performance. Data were taken using
driving high-performance ΔΣ and successive the High-Resolution mode (52 kSPS) of the ADS1278
approximation register (SAR) ADCs in audio and with input frequencies at 1 kHz and 10 kHz and
industrial applications using a single 3-V to 5-V power signal levels 1/2 dB below full-scale (–0.5 dBFS). FFT
supply. To show achievable performance, the plots showing the spectral performance are given in
THS4521 is tested as the drive amplifier for the Figure 82 and Figure 83; tabulated ac analysis results
ADS1278 24-bit ADC. The ADS1278 offers excellent are shown in Table 6 and compared to the ADS1278
ac and dc performance, with four selectable operating data sheet typical performance specifications.
Figure 81. THS4521 and ADS1278 (Ch 1) Test Circuit
Figure 82. 1-kHz FFT Figure 83. 10-kHz FFT
Table 6. AC Analysis
Configuration Tone Signal (dBFS) SNR (dBc) THD (dBc) SINAD (dBc) SFDR (dBc)
THS4521and 1 kHz –0.5 109 –108 105 114
ADS1278
10 kHz –0.5 102 –110 101 110
ADS1278 Data
1 kHz –0.5 110 –108 — 109
sheet (typ)
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