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| 型号： | TRF7961RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 4/52页 |
| 文件大小： | 1023K |
| 代理商： | TRF7961RHBR |
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SLOU186F – AUGUST 2006 – REVISED AUGUST 2010
www.ti.com
5.1.3
Supply Regulator Configuration
The supply regulators can be automatically or manually configured by the control bits. The available
regulator settings. Table 5-2 shows manual mode for selection of a 3-V system. Table 5-3 and Table 5-4
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 VIN level, but not higher than 5 V for VDD_RF, 3.5 V for
VDD_A, and 3.4 V for VDD_X. This ensures the highest possible supply voltage for the RF output stage while
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 VDD_X by increasing the target voltage difference across the
Table 5-1. Supply-Regulator Setting – Manual – 5-V System
Byte
Option Bits Setting in Control Register
Action
Address
B7
B6
B5
B4
B3
B2
B1
B0
00
1
5-V system
0B
0
Manual regulator setting
0B
0
1
VDD_RF = 5 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
0
VDD_RF = 4.9 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
0
1
VDD_RF = 4.8 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
0
VDD_RF = 4.7 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
VDD_RF = 4.6 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
0
VDD_RF = 4.5 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
1
VDD_RF = 4.4 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
0B
0
VDD_RF = 4.3 V, VDD_A = 3.5 V, and VDD_X = 3.4 V
Table 5-2. Supply-Regulator Setting – Manual – 3-V System
Byte
Option Bits Setting in Control Register
Action
Address
B7
B6
B5
B4
B3
B2
B1
B0
00
0
3V system
0B
0
Manual regulator setting
0B
0
1
VDD_RF = 3.4 V, VDD_A, and VDD_X = 3.4 V
0B
0
1
0
VDD_RF = 3.3 V, VDD_A, and VDD_X = 3.3 V
0B
0
1
0
1
VDD_RF = 3.2 V, VDD_A, and VDD_X = 3.2 V
0B
0
1
0
VDD_RF = 3.1 V, VDD_A, and VDD_X = 3.1 V
0B
0
1
VDD_RF = 3.0 V, VDD_A, and VDD_X = 3.0 V
0B
0
1
0
VDD_RF = 2.9 V, VDD_A, and VDD_X = 2.9 V
0B
0
1
VDD_RF = 2.8 V, VDD_A, and VDD_X = 2.8 V
0B
0
VDD_RF = 2.7 V, VDD_A, and VDD_X = 2.7 V
12
System Description
Copyright 2006–2010, Texas Instruments Incorporated
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