ZHCSH90A January 2015 – December 2017 VSP5324-Q1
PRODUCTION DATA.
The VSP5324-Q1 device includes programmable digital gain settings from 0 dB to 12 dB in 1-dB steps. The benefit of digital gain is to obtain improved SFDR performance. SFDR improvement is achieved at the expense of SNR; for each gain setting, SNR degrades by approximately 1 dB. Therefore, gain can be used to trade-off between SFDR and SNR.
For each gain setting, the analog input full-scale range support scales proportionally, as shown in Table 1. After reset, the device is in 0-dB gain mode. To use other gain settings, program the GAIN_CHx bits in registers 2Ah (see the Register 2Ah (offset = 2Ah) [reset = 0] section) and 2Bh (see the Register 2Bh (offset = 2Bh) [reset = 0] section).
DIGITAL GAIN (dB) | FULL-SCALE (VPP) |
---|---|
0 | 2 |
1 | 1.78 |
2 | 1.59 |
3 | 1.42 |
4 | 1.26 |
5 | 1.12 |
6 | 1.00 |
7 | 0.89 |
8 | 0.80 |
9 | 0.71 |
10 | 0.63 |
11 | 0.56 |
12 | 0.50 |