Texas Instruments TRF7960 Manual page 12

TRF7960, TRF7961
SLOU186G – AUGUST 2006 – REVISED MAY 2017
The application can reset 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 for V , and 3.4 V for V
DD_A
output stage while maintaining an adequate PSRR (power supply rejection ratio). As an example, the
application can improve the PSRR if there is a noisy supply voltage from V
voltage difference across the V
Table 6-5.
OPTION BITS SETTING IN CONTROL REGISTER
BYTE
ADDRESS
B7 B6
0x00
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
OPTION BITS SETTING IN CONTROL REGISTER
BYTE
ADDRESS
B7 B6
0x00
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
0x0B 0
Table 6-4. Supply-Regulator Setting – Automatic – 5-V System
OPTION BITS SETTING IN CONTROL REGISTER
BYTE
ADDRESS
B7 B6
0x00
0x0B 1
0x0B 1
0x0B 1
(1) x = Don't care
12 Detailed Description
. This algorithm ensures the highest possible supply voltage for the RF
DD_X
regulator as listed for automatic regulator settings in
DD_X
Table 6-2. Supply-Regulator Setting – Manual – 5-V System
B5 B4 B3 B2 B1
1 1
1 1
1 0
1 0
0 1
0 1
0 0
0 0
Table 6-3. Supply-Regulator Setting – Manual – 3-V System
B5 B4 B3 B2 B1
1 1
1 1
1 0
1 0
0 1
0 1
0 0
0 0
(1)
B5 B4 B3 B2 B1
x 1
x 1
x 0
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level, but not higher than 5 V for V
IN
B0
1 5-V system
Manual regulator setting
1 V = 5 V, V = 3.5 V, V
DD_RF DD_A
0 V = 4.9 V, V = 3.5 V, V
DD_RF DD_A
1 V = 4.8 V, V = 3.5 V, V
DD_RF DD_A
0 V = 4.7 V, V = 3.5 V, V
DD_RF DD_A
1 V = 4.6 V, V = 3.5 V, V
DD_RF DD_A
0 V = 4.5 V, V = 3.5 V, V
DD_RF DD_A
1 V = 4.4 V, V = 3.5 V, V
DD_RF DD_A
0 V = 4.3 V, V = 3.5 V, V
DD_RF DD_A
B0
0 3-V system
Manual regulator setting
1 V = 3.4 V, V , V
DD_RF DD_A DD_X
0 V = 3.3 V, V , V
DD_RF DD_A DD_X
1 V = 3.2 V, V , V
DD_RF DD_A DD_X
0 V = 3.1 V, V , V
DD_RF DD_A DD_X
1 V = 3.0 V, V , V
DD_RF DD_A DD_X
0 V = 2.9 V, V , V
DD_RF DD_A DD_X
1 V = 2.8 V, V , V
DD_RF DD_A DD_X
0 V = 2.7 V, V , V
DD_RF DD_A DD_X
B0
1 5-V system
1 Automatic regulator setting; approximately 250-mV difference
0 Automatic regulator setting; approximately 350-mV difference
0 Automatic regulator setting; approximately 400-mV difference
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TRF7960 TRF7961
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DD_RF
by increasing the target
DD_X
Table 6-4
ACTION
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
= 3.4 V
DD_X
ACTION
= 3.4 V
= 3.3 V
= 3.2 V
= 3.1 V
= 3.0 V
= 2.9 V
= 2.8 V
= 2.7 V
ACTION
, 3.5
and