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TRF7970A
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
www.ti.com
Power Amplifier Supply: V DD_PA
The power amplifier of the TRF7970A is supplied through V DD_PA (pin 4). The positive supply pin for the RF
power amplifier is externally connected to the regulator output V DD_RF (pin 3).
I/O Level Shifter Supply: V DD_I/O
The TRF7970A has a separate supply input V DD_I/O (pin 16) for the built-in I/O level shifter. The supported
input voltage ranges from 1.8 V to V IN , not exceeding 5.5 V. Pin 16 is used to supply the I/O interface pins
(I/O_0 to I/O_7), IRQ, SYS_CLK, and DATA_CLK pins of the reader. In typical applications, V DD_I/O is
directly connected to V DD_X , while V DD_X also supplies the MCU. This ensures that the I/O signal levels of
the MCU match the logic levels of the TRF7970A.
Negative Supply Connections: V SS , V SS_TX , V SS_RX , V SS_A , V SS_PA
The negative supply connections V SS_X of each functional block are all externally connected to GND.
The substrate connection is V SS (pin 10), the analog negative supply is V SS_A (pin 15), the logic negative
supply is V SS_D (pin 29), the RF output stage negative supply is V SS_PA (pin 6), and the negative supply for
the RF receiver V SS_RX (pin 7).
16
Detailed Description
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Copyright ? 2011–2014, Texas Instruments Incorporated
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