MUX
RX_IN1
RX_IN2
Phase and
Amplitude
Detector
Gain
RSSI
(AUX)
Logic
Level
Shifter
State
Control
Logic
(Control
Registers and
Command
Logic)
12-Byte
FIFO
MCU
Interface
VDD_I/O
I/O_0
I/O_1
I/O_2
I/O_3
I/O_4
I/O_5
I/O_6
I/O_7
IRQ
SYS_CLK
DATA_CLK
ISO
Protocol
Handling
Decoder
RSSI
(External)
Gain
RSSI
(Main)
Filter
and AGC
Digitizer
Bit
Framing
Framing
Serial
Conversion
CRC and Parity
Transmitter
Analog Front End
TX_OUT
VDD_PA
VSS_PA
Digital Control
State Machine
Crystal or Oscillator
Timing System
EN
EN2
ASK/OOK
MOD
OSC_IN
OSC_OUT
Voltage Supply Regulator Systems
(Supply Regulators and Reference Voltages)
VSS_A
VSS_RF
VDD_RF
VDD_X
VSS_D
VSS
VIN
VDD_A
BAND_GAP
Phase and
Amplitude
Detector
Copyright © 2017, Texas Instruments Incorporated
11
SLOS758G – DECEMBER 2011 – REVISED MARCH 2020
Product Folder Links:
Detailed Description
Copyright © 2011–2020, Texas Instruments Incorporated
6
Detailed Description
6.1
Functional Block Diagram
shows the functional block diagram.
Figure 6-1. Functional Block Diagram
6.2
Power Supplies
The TRF7963A positive supply input VIN (pin 2) sources three internal regulators with output voltages
VDD_RF, VDD_A, and VDD_X. All regulators require external bypass capacitors for supply noise filtering
and must be connected as indicated in reference schematics. These regulators provide a high power
supply reject ratio (PSRR) as required for RFID reader systems. All regulators are supplied by VIN (pin 2).
The regulators are not independent and have common control bits in register 0x0B for output voltage
setting. The regulators can be configured to operate in either automatic or manual mode (register 0x0B, bit
7). The automatic regulator setting mode ensures an optimal compromise between PSRR and the highest
possible supply voltage for RF output (to ensure maximum RF power output). The manual mode lets the
user manually configure the regulator settings.
