miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
15
The UMA-16 firmware supports 16 input channels at 8, 11.025, 12, 16, 32, 44.1 and 48 kHz. PDM input data is
received on J3, with two channels per physical data line. These 16 channels are mirrored in I2S format on J1 and
are also received by the computer over USB.
Table 1. PDM firmware pinouts
J1 pin
J3 pin
1
PDM Rx 1-2
1
GND
2
PDM Rx 9-10
2
3.3V
3
PDM Rx 3-4
3
PDM 1-2
4
PDM Rx 11-12
4
PDM 3-4
5
PDM Rx 5-6
5
PDM 5-6
6
PDM Rx 13-14
6
PDM 7-8
7
PDM Rx 7-8
7
PDM 9-10
8
PDM Rx 15-16
8
PDM 11-12
9
MCLK
9
PDM 13-14
10
BCLK
10
PDM 15-16
11
GND
11
PDM CLK
12
LRCLK
12
PDM CLK2
Figure 2. PDM firmware signal flow
