User Manual

SDB670 – SERVICE MANUAL TNM-M-E-0032
May 13 Page 41 TECHNICAL DESCRIPTION
• 2V5A analogue supply via regulator U909 and L929a to U804, U805 as a reference supply.
1.2 V Regulator U906B
Regulated 1.2V supply (1V2S):
• 1V2D digital supply via L928/L928a to DSP core U203.
• 1V2 digital supply via L928b/L928c to FPGA core U300C and ADC U401.
3V0 Regulator U310
• 3 V supply (3V0) reference for external interface transient protection.
• –12 V supply (–12V) for front-end varactor tuning.
–12/-16 V Power Supply U908A/B/F
• –16 V supply (–16V) for VCO varactor tuning reference.
• –12 V supply (–12V) for front-end varactor tuning.
Unregulated 13.8 V (BAT-UNSW)
• Supplies BAT-UNSW to Tx PA module U505.
• Supplies BAT-UNSW to Antenna changeover switch Q504/Q508/Q509.
• Supplies BAT-UNSW to Ripple Filter via R37.
• Supplies BAT-UNSWF to Rx audio PA U808 via L3, L3A, F900.
Unregulated 12 V (BAT-SWF)
Supplies BAT-SWF to external accessories via ripple filter Q901. The ripple filter is designed to
isolate external accessories from the effects of vehicle-induced ripple on the battery supply.