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參數(shù)資料
| 型號： | DR280AKS-REEL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 1.2 V Ultralow Power High PSRR Voltage Reference |
| 中文描述： | 1.2伏超低功耗高電源抑制比基準電壓源 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 498K |
| 代理商： | DR280AKS-REEL |
ADR280
–6–
Negative Reference
A negative reference can be precisely configured without using
any expensive tight tolerance resistors, as shown in Figure 10.
The voltage difference between V
OUT
and V– is 1.2 V. Since V
OUT
is at virtual ground, U2 will close the loop by forcing the V– pin
to be the negative reference output.
V+
V
OUT
0.1
F
V–
ADR280
U1
+5V
V+
V–
–2.7V
AD8541
–1.2V
–V
REF
U2
C1
Figure 10. Negative Reference
Boosted Reference with Scalable Output
A precision user defined output with boosted current capabil-
ity can be implemented with the circuit shown in Figure 11. In
this circuit, U2 forces V
O
to be equal to V
REF
(1 + R2/R1) by
regulating the turn-on of M1; the load current is therefore fur-
nished by the 5 V supply. For higher output voltage, U2 must
be changed and the supply voltage of M1 and U2 must also be
elevated and separated from the U1 input voltage. In this config-
uration, a 100 mA load is achievable at a 5 V supply. The higher
the supply voltage, the lower the current handling is because of
the heat generated on the MOSFET. For heavy capacitive loads,
additional buffering is needed at the output to enhance the
transient response.
V+
V
OUT
V–
ADR280
U1
5V
V+
V–
U2
R1
R2
RL
25
V
O
10.8k
0.1%
10k
0.1%
C2
1pF
1.2V
AD8541
0.1
F
C1
M1
2.5V/100mA
M1 = FDB301N, 2N7000, 2N7002, OR EQUIVALENT
Figure 11. 2.5 V Boosted Reference
GSM and 3G Mobile Station Applications
The ADR280 voltage reference is ideal for use with analog base-
band ICs in GSM and 3G mobile station applications. Figure 12
illustrates the use of the ADR280 with the AD6535 GSM analog
baseband. The AD6535 provides all of the data converters and
power management functions needed to implement a GSM
mobile station, including baseband and audio codecs, voltage
regulators, and a battery charger. Besides low current consump-
tion and a small footprint, the ADR280 is optimized for excellent
power supply rejection ratio (PSRR) necessary for optimum
AD6535 device performance when the main battery voltage
fluctuates during RF power amplifier activity.
DIGITAL
BASEBAND
AD6535 ANALOG
BASEBAND
BASEBAND CODEC
AUDIO CODEC
POWER
MANAGEMENT
RADIO
ADR280
VOLTAGE REFERENCE
Figure 12. GSM Mobile Station Application
REV. A
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