Datasheet > AD8315ACP-EVALZ

AD8315ACP-EVALZ

更新时间： 2024-11-30 01:19:39

品牌	Logo	应用领域
亚德诺 - ADI		GSM
页数	文件大小	规格书
22页	447K
描述
50 dB GSM PA Controller

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AD8315ACP-EVALZ 数据手册

50 dB GSM PA Controller

AD8315

Its high sensitivity allows control at low signal levels, thus

reducing the amount of power that must be coupled to

the detector.

Data Sheet

FEATURES

Complete RF detector/controller function

>50 dB range at 0.9 GHz (−49 dBm to +2 dBm, re 50 Ω)

Accurate scaling from 0.1 GHz to 2.5 GHz

Temperature-stable linear-in-dB response

Log slope of 23 mV/dB, intercept at −60 dBm at 0.9 GHz

True integration function in control loop

Low power: 20 mW at 2.7 V, 38 mW at 5 V

Power-down to 10.8 μW

For convenience, the signal is internally ac-coupled. This

high-pass coupling, with a corner at approximately 0.016 GHz,

determines the lowest operating frequency. Therefore, the

source can be dc grounded.

The AD8315 provides a voltage output, VAPC, that has the

voltage range and current drive to directly connect to most

handset power amplifiers’ gain control pin. VAPC can swing

from 250 mV above ground to within 200 mV below the supply

voltage. Load currents of up to 6 mA can be supported.

APPLICATIONS

Single, dual, and triple band mobile handset (GSM, DCS, EDGE)

Transmitter power control

The setpoint control input is applied to the VSET pin and has

an operating range of 0.25 V to 1.4 V. The associated circuit

determines the slope and intercept of the linear-in-dB

measurement system; these are nominally 23 mV/dB and

−60 dBm for a 50 Ω termination (−73 dBV) at 0.9 GHz.

Further simplifying the application of the AD8315, the input

resistance of the setpoint interface is over 100 MΩ, and the bias

current is typically 0.5 μA.

GENERAL DESCRIPTION

The AD8315 is a complete low cost subsystem for the precise

control of RF power amplifiers operating in the frequency range

0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB.

It is intended for use in cellular handsets and other battery-

operated wireless devices. The log amp technique provides a much

wider measurement range and better accuracy than controllers

using diode detectors. In particular, the temperature stability is

excellent over a specified range of −30°C to +85°C.

The AD8315 is available in MSOP and LFCSP packages and

consumes 8.5 mA from a 2.7 V to 5.5 V supply. When powered

down, the sleep current is 4 μA.

FUNCTIONAL BLOCK DIAGRAM

VPOS

ENBL

LOW NOISE

BAND GAP

REFERENCE

OUTPUT

ENABLE

DELAY

LOW NOISE

GAIN BIAS

VAPC

×1.35

HI-Z

DET

LOW NOISE (25nV/√Hz)

RAIL-TO-RAIL BUFFER

RFIN

FLTR

VSET

10dB

V-I

23mV/dB

250mV TO

1.4V = 50dB

OFFSET

COMP’N

INTERCEPT

POSITIONING

COMM

Figure 1.

Rev. D

Document Feedback

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Technical Support

www.analog.com

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与AD8315ACP-EVALZ相关器件

型号	品牌	获取价格	描述	数据表
AD8315ACP-REEL	ADI	获取价格	50 dB GSM PA Controller
AD8315ACP-REEL7	ADI	获取价格	50 dB GSM PA Controller
AD8315ACPZ-REEL	ADI	获取价格	50 dB GSM PA Controller
AD8315ACPZ-REEL7	ADI	获取价格	50 dB GSM PA Controller
AD8315ARM	ADI	获取价格	50 dB GSM PA Controller
AD8315ARM-REEL	ADI	获取价格	50 dB GSM PA Controller
AD8315ARM-REEL7	ADI	获取价格	50 dB GSM PA Controller
AD8315ARMZ	ADI	获取价格	50 dB GSM PA Controller
AD8315ARMZ-REEL	ADI	获取价格	SPECIALTY TELECOM CIRCUIT, PDSO8, MO-187AA, MSOP-8
AD8315ARMZ-RL	ADI	获取价格	50 dB GSM PA Controller

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