参数资料
| 型号： | AD7294BCPZRL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 39/49页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT I2C/SRL 1M 56LFCSP |
| 标准包装： | 2,500 |
| 类型： | ADC，DAC |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 22.22k |
| 数据接口： | I²C，串行 |
| 电压电源： | 模拟和数字 |
| 电源电压： | 4.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 56-LFCSP-VQ（8x8） |
| 包装： | 带卷 (TR) |
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Data Sheet
AD7294
Rev. H | Page 43 of 48
APPLICATIONS INFORMATION
The AD7294 contains all the functions required for general-
purpose monitoring and control of current, voltage, and
temperature. With its 59.4 V maximum common-mode range,
the device is useful in industrial and automotive applications where
current sensing in the presence of a high common-mode voltage
is required. For example, the part is ideally suited for monitoring
and controlling a power amplifier in a cellular base station.
BASE STATION POWER AMPLIFIER MONITOR AND
CONTROL
The AD7294 is used in a power amplifier signal chain to
achieve the optimal bias condition for the LDMOS transistor.
The main factors influencing the bias conditions are tempera-
ture, supply voltage, gate voltage drift, and general processing
parameters. The overall performance of a power amplifier
configuration is determined by the inherent tradeoffs required
in efficiency, gain, and linearity. The high level of integration
offered by the AD7294 allows the use of a single chip to
dynamically control the drain bias current to maintain a constant
value over temperature and time, thus significantly improving
the overall performance of the power amplifier. The AD7294
incorporates the functionality of eight discrete components
bringing considerable board area savings over alternative
solutions.
The circuit in Figure 59 is a typical system connection diagram
for the AD7294. The device monitors and controls the overall
performance of two final stage amplifiers. The gain control and
phase adjustment of the driver stage are incorporated in the
application and are carried out by the two available uncommitted
outputs of the AD7294. Both high-side current senses measure
the amount of current on the respective final stage amplifiers.
The comparator outputs, ISENSE1 OVERRANGE and ISENSE2
OVERRANGE pins, are the controlling signals for switches
on the RF inputs of the LDMOS power FETs. If the high-side
current sense reads a value above a specified limit compared
with the setpoint, the RF IN signal is switched off by the
comparator.
By measuring the transmitted power (Tx) and the received
power (Rx), the device can dynamically change the drivers and
PA signal to optimize performance. This application requires a
logarithmic detector/controller, such as Analog Devices AD8317
CO
M
P
ARAT
O
RS
AND
RE
G
IS
T
E
RS
MUX
TEMP
SENSOR
HIGH SIDE
CURRENT
SENSE
HIGH SIDE
CURRENT
SENSE
T1
T2
VOUTA
VOUTB
VOUTC
FILTER
RF CHOKE
RF OUT
LDMOS
RS1(+)
RS2(+)
RS2(–)
RS1(–)
RS2(–)
D1+
D2+
D2–
D1–
SET-POINT
240mV
ISENSE1
OVERRANGE
ISENSE2
OVERRANGE
GAIN
CONTROL
RSENSE
VDD
LDMOS
RF OUT
12-BIT
ADC
VIN0
VIN1
VIN2
VIN3
12-BIT
DAC
12-BIT
DAC
12-BIT
DAC
12-BIT
DAC
VOUTD
GAIN
CONTROL
RF CHOKE
Tx POWER
MONITOR
Rx POWER
MONITOR
Tx
POWER
RF CUTOFF
Rx
POWER
AD7294*
RF IN
*ADDITIONAL PINS OMITTED FOR CLARITY.
REF
05747-
036
Figure 59. Typical HPA Monitor and Control Application
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