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TRF7960
TRF7961
SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
5.1.3 Supply Regulator Configuration
The supply regulators can be automatically or manually configured by the control bits. The available
options are shown in
regulator settings.
show the automatic-mode gain settings for 5-V and 3-V systems.
The automatic mode is the default configuration. In automatic mode, the regulators are automatically set
every time the system is activated by asserting the EN input HIGH. The internal regulators are also
automatically reconfigured every time the automatic regulator selection bit is set HIGH (on the rising
edge).
The user can re-run the automatic mode setting from a state in which the automatic setting bit is already
high by changing the automatic setting bit from high to low to high. The regulator-configuration algorithm
adjusts the regulator outputs 250 mV below the V
V
, and 3.4 V for V
DD_A
maintaining an adequate PSRR (power supply rejection ratio). As an example, the user can improve the
PSRR if there is a noisy supply voltage from V
V
regulator as shown for automatic regulator settings in
DD_X
Table 5-1. Supply-Regulator Setting – Manual – 5-V System
Byte
Option Bits Setting in Control Register
Address
B7
B6
B5
00
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
Table 5-2. Supply-Regulator Setting – Manual – 3-V System
Byte
Option Bits Setting in Control Register
Address
B7
B6
B5
00
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
0B
0
12
System Description
Table 5-1
through
Table
Table 5-2
shows manual mode for selection of a 3-V system.
. This ensures the highest possible supply voltage for the RF output stage while
DD_X
B4
B3
B2
B1
1
1
1
1
0
0
0
0
B4
B3
B2
B1
1
1
1
1
0
0
0
0
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5-4.
Table 5-1
shows a 5-V system and the manual-mode
level, but not higher than 5 V for V
IN
by increasing the target voltage difference across the
DD_X
Table 5-3
Action
B0
1
5-V system
Manual regulator setting
1
1
V
= 5 V, V
DD_RF
1
0
V
= 4.9 V, V
DD_RF
0
1
V
= 4.8 V, V
DD_RF
0
0
V
= 4.7 V, V
DD_RF
1
1
V
= 4.6 V, V
DD_RF
1
0
V
= 4.5 V, V
DD_RF
0
1
V
= 4.4 V, V
DD_RF
0
0
V
= 4.3 V, V
DD_RF
Action
B0
0
3V system
Manual regulator setting
1
1
V
= 3.4 V, V
DD_RF
1
0
V
= 3.3 V, V
DD_RF
0
1
V
= 3.2 V, V
DD_RF
0
0
V
F = 3.1 V, V
DD_R
1
1
V
= 3.0 V, V
DD_RF
1
0
V
= 2.9 V, V
DD_RF
0
1
V
= 2.8 V, V
DD_RF
0
0
V
= 2.7 V, V
DD_RF
Copyright © 2006–2010, Texas Instruments Incorporated
TRF7960 TRF7961
Table 5-3
and
, 3.5 V for
DD_RF
and
Table
5-4.
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
= 3.5 V, and V
= 3.4 V
DD_A
DD_X
, and V
= 3.4 V
DD_A
DD_X
, and V
= 3.3 V
DD_A
DD_X
, and V
= 3.2 V
DD_A
DD_X
, and V
= 3.1 V
DD_A
DD_X
, and V
= 3.0 V
DD_A
DD_X
, and V
= 2.9 V
DD_A
DD_X
, and V
= 2.8 V
DD_A
DD_X
, and V
= 2.7 V
DD_A
DD_X
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Table 5-4
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