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| 型号： | TPS65040ZQER |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, PBGA71 |
| 封装： | 5 X 5 MM, 0.50 MM PITCH, GREEN, PLASTIC, MICRO, BGA-71 |
| 文件页数： | 52/73页 |
| 文件大小： | 1928K |
| 代理商： | TPS65040ZQER |
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COVREF2
0.1uF
VREF2
GND3
VREF2Buffer
Amplifier
REFERENCEBLOCK
+
-
COVTCXO
1.0uF
VTCXO
GND3
Enable
SYSCLK_EN
VBN3
Current
Limit
PowerSupplyFor
ClockDistributionBlock
(InternallyConnection)
PAVREF
SLVS708B – NOVEMBER 2006 – REVISED APRIL 2007
Figure 78. VTCXO Block Diagram
PAVREF is an 8-bit DAC whose output can be used as reference power supply for the RF power amplifier.
Figure 79 shows a block diagram. PAVREF is powered up by TXNONFST=High and TXON=High. One output
pin is selected by combining TBNDSEL2 pin and TBNDSEL1 pin from among three output pins, enabling the
output voltage. The serial interface does not control the selection of the power up, and the output terminal. The
output voltage is controlled by a register named DAC. The output voltage corresponds to the data of DACW
register. The DACW register can be controlled through the serial interface, and the default is 80h. More detail is
given in the SERIAL INTERFACE Section. Table 13 shows the control of PAVREF. PAVREF has a special LDO
and has good characteristics for the power supply ripple rejection. And, a load current of 5 mA or less can be
supplied by the output buffer. The output buffer is off, and all the output pins are pulled down to GND, in
TXONFST=High and TXON=Low, although internal circuits (DAC, LDO) of PAVREF are turned on. The output
buffer is off and all the output pins are also pulled down to GND in TBNDSEL2=High and TBMDSEL1=High
although internal circuit (DAC, LDO) of PAVREF are turned on. When PAVREF is powered up by TXONFST pin,
and TXON pin from power down, the output voltage is kept at the same voltage before power down by the
DACW register. CRESET pin goes low or REG_EN pin goes low, the DACW register is reset and output voltage
returns to the default voltage. Turn off PAVREF before changing the output terminal. Also turn off PAVREF in
the condition of VBAT< 3.1 V.
56
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