3.8.1 TX Test Mode

Configure the TX Test mode to transmit only the preamble of the data telegram with different preamble settings, as shown in the following table. After setting the Test mode, enable the Transmit mode. The Test mode continues until the device is Reset.
Table 3-5. TX Test Mode Preamble Settings
Configuration BitsBit Description
A19 Register
DIG_TX_OnlyPreamble= 1: Continuously transmit preamble only (Test mode, to exit this mode, a Reset must be applied)
DIG_TX_Parttern[2:0]Select preamble pattern:

  • = 0: 00001111

  • = 1: 0001

  • = 2: 0011

  • = 3: 0111

  • = 4: 0101
  • = 5: 0000
  • = 6: 1111
A21 Register

DIG_RXPR_TXVR

DIG_RXoRXPR_enable

DIG_XoX_PRVR

DIG_PostAmble_en

These bits enable:

TX mode = 0010

DIG_PulseLength[2:0]Pulse repetition rate = 111
The TX output power is determined by the A14 TX PA register (A14 – TX PA Register). The TX power level can be adjusted separately for the data telegram sections (refer to the ATA8352 Impulse-Radio Ultra-Wideband (IR-UWB) Transceiver User's Guide) with the following parameters:
  • Preamble: txpa_sel_pwr_PA[3:0]
  • Sync Word: txpa_sel_pwr_SW[3:0]
  • Data Payload: txpa_sel_pwr[3:0]
  • Postamble: txpa_sel_pwr_PO[3:0]
The output power can be fine-tuned in steps of approximately ±0.2 dB from the default setting of 8 with the parameters:
  • Preamble: txpa_pac_bias_PA[3:0]
  • Sync Word: txpa_pac_bias_SW[3:0]
  • Data Payload: txpa_pac_bias[3:0]
  • Postamble: txpa_pac_bias_PO[3:0]
The following figure illustrates the curves for the TX average power within the 10 dB bandwidth boundaries, for a composite bandwidth of 610 MHz with three curves for the txpa_pac_bias parameters 0, 8 and 15. All curves apply to the same setup for the preamble, sync word, data payload and postamble.
Figure 3-4. TX PA Setting txpa_sel_pwr[3:0]
Note: For measurements regarding regulation requirements, consider the active TX period within a 1 ms interval; that is, the continuous preamble TX mode must be corrected to these requirements or the Verifier mode is used when there is no prover device available in the detection range.