SLAAED2A June 2023 – November 2023 TLV320ADC3120 , TLV320ADC3140 , TLV320ADC5120 , TLV320ADC5140 , TLV320ADC6120 , TLV320ADC6140
The TLV320ADC6140 from Texas Instruments is used to demonstrate the improvement of dynamic range and SNR for ADCs. The TLV320ADC6140 has an embedded channel summation mode to achieve higher SNR. This option can be activated for 2-channels or 4-channels using the assigned register (0x6B). For this demonstration, 4-channel summation mode is enabled, which mathematically performs the following operation: (CH1 + CH2 + CH3 + CH4) / 4. Table 4-5 through Table 4-8 show the performance improvement for the TLV320ADC6140 by summation of 2 and 4 channels.
In this mode, the digital recording data is averaged with equal weighing, which helps reduce the effective recorded noise.
| Dynamic Range | Pre-Summation (dBFS) |
Post-Summation (dBFS) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 123.25 | 126.54 | 3.29 |
| Channel 2 | 123.25 | ||
| Channel 3 | 123.19 | 126.52 | 3.33 |
| Channel 4 | 123.19 |
| Dynamic Range | Pre-Summation (dBFS) |
Post-Summation (dBFS) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 123.25 | 129.52 | 6.3 |
| Channel 2 | 123.25 | ||
| Channel 3 | 123.19 | ||
| Channel 4 | 123.19 |
| SNR | Pre-Summation (dBFS) |
Post-Summation (dBFS) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 123.25 | 126.25 | 3.00 |
| Channel 2 | 123.25 | ||
| Channel 3 | 123.19 | 126.13 | 2.94 |
| Channel 4 | 123.19 |
| SNR | Pre-Summation (dBFS) |
Post-Summation (dBFS) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 123.25 | 129.16 | 5.94 |
| Channel 2 | 123.25 | ||
| Channel 3 | 123.19 | ||
| Channel 4 | 123.19 |
| Dynamic Range | Pre-Summation (dB) |
Post-Summation (dB) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 113.25 | 116.13 | 2.88 |
| Channel 2 | 113.25 | ||
| Channel 3 | 113.19 | 116.13 | 2.94 |
| Channel 4 | 113.19 |
| Dynamic Range | Pre-Summation (dB) |
Post-Summation (dB) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 113.25 | 118.73 | 5.51 |
| Channel 2 | 113.25 | ||
| Channel 3 | 113.19 | ||
| Channel 4 | 113.19 |
| SNR | Pre-Summation (dB) |
Post-Summation (dB) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 112.94 | 116.06 | 2.96 |
| Channel 2 | 112.94 | ||
| Channel 3 | 113.05 | 116.01 | 2.97 |
| Channel 4 | 113.05 |
| SNR | Pre-Summation (dB) |
Post-Summation (dB) |
Improvement (dB) |
|---|---|---|---|
| Channel 1 | 112.94 | 118.99 | 5.92 |
| Channel 2 | 112.94 | ||
| Channel 3 | 113.05 | ||
| Channel 4 | 113.05 |
| Device | Device SNR/ Dynamic Range (default) (dB) |
Device SNR/ Dynamic Range (with 4-channel summation) (dB) |
Device SNR/ Dynamic Range (with 2-channel summation) (dB) |
|---|---|---|---|
| TLV320ADC6140 | With DRE: 123 dB | With DRE: 129 dB (Mono-mode) | With DRE: 126 dB (Stereo-mode) |
| Without DRE: 113 dB | Without DRE: 119 dB (Mono-mode) | Without DRE: 116 dB (Stereo-mode) | |
| TLV320ADC5140 | With DRE: 120 dB | With DRE: 126 dB (Mono-mode) | With DRE: 123 dB (Stereo-mode) |
| Without DRE: 108 dB | Without DRE: 114 dB (Mono-mode) | Without DRE: 111 dB (Stereo-mode) | |
| TLV320ADC3140 | 106 dB | 112 dB (Mono-mode) | 109 dB (Stereo-mode) |
| TLV320ADC6120 | With DRE: 123 dB | N/A | With DRE: 126 dB (Mono-mode) |
| Without DRE: 113 dB | N/A | Without DRE: 116 dB (Mono-mode) | |
| TLV320ADC5120 | With DRE: 120 dB | N/A | With DRE: 123 dB (Mono-mode) |
| Without DRE: 108 dB | N/A | Without DRE: 111 dB (Mono-mode) | |
| TLV320ADC3120 | 106 dB | N/A | 109 dB (Mono-mode) |
These measurements are performed with AC coupled, differential line inputs, which result in dynamic range and SNR improvements of approximately 6 dB for 4 channel-summation and approximately 3 dB for 2 channel-summation. Similar channel-summation feature is available in the audio ADCs listed in Table 4-8 with expected improvement in dynamic range as well as SNR.