Texas Instruments TRF7970A Manual page 18

TRF7970A
SLOS743L – AUGUST 2011 – REVISED MARCH 2017
Power Amplifier Supply: V
The power amplifier of the TRF7970A is supplied through V
RF power amplifier is externally connected to the regulator output V
I/O Level Shifter Supply: V
The TRF7970A has a separate supply input V
input voltage ranges from 1.8 V to V
(I/O_0 to I/O_7), IRQ, SYS_CLK, and DATA_CLK pins of the reader. In typical applications, V
directly connected to V
the MCU match the logic levels of the TRF7970A.
Negative Supply Connections: V
The negative supply connections V
The substrate connection is V
supply is V (pin 29), the RF output stage negative supply is V
SS_D
the RF receiver V
SS_RX
18 Detailed Description
DD_PA
DD_I/O
DD_I/O
, not exceeding 5.5 V. Pin 16 is used to supply the I/O interface pins
IN
, while V also supplies the MCU. This ensures that the I/O signal levels of
DD_X DD_X
, V , V
SS SS_TX SS_RX
of each functional block are all externally connected to GND.
SS_X
(pin 10), the analog negative supply is V
SS
(pin 7).
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(pin 4). The positive supply pin for the
DD_PA
(pin 3).
DD_RF
(pin 16) for the built-in I/O level shifter. The supported
, V , V
SS_A SS_PA
SS_A
(pin 6), and the negative supply for
SS_PA
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DD_I/O
(pin 15), the logic negative
is