AD8315ACP-EVAL Analog Devices Inc, AD8315ACP-EVAL Datasheet
AD8315ACP-EVAL
Manufacturer Part Number
AD8315ACP-EVAL
Description
Manufacturer
Analog Devices Inc
Datasheet
1.AD8315ACP-EVAL.pdf
(2 pages)
Specifications of AD8315ACP-EVAL
Lead Free Status / Rohs Status
Not Compliant
BOARD DESCRIPTION
Figure 1 shows the schematic of the AD8315 MSOP evaluation
board. The layout and silkscreen of the component side are shown
in Figures 2 and 3. An evaluation board is also available for the
LFCSP package (for exact part numbers, see Ordering Guide).
Apart from the slightly smaller device footprint, the LFCSP
evaluation board is identical to the MSOP board. The board is
powered by a single supply in the 2.7 V to 5.5 V range. The
power supply is decoupled by a single 0.1 mF capacitor. Table I
details the various configuration options of the evaluation board.
For operation in controller mode, both jumpers, LK1 and LK2,
should be removed. The setpoint voltage is applied to VSET,
RFIN is connected to the RF source (PA output or directional
coupler), and VAPC is connected to the gain control pin of the
PA. When used in controller mode, a capacitor must be installed in
C4 for loop stability. For GSM/DCS handset power amplifiers,
this capacitor should typically range from 150 pF to 300 pF.
A quasi-measurement mode (where the AD8315 delivers an
output voltage proportional to the log of the input signal) can be
implemented to establish the relationship between VSET and
RFIN by installing the two jumpers, LK1 and LK2. This mim-
ics an AGC loop. To establish the transfer function of the log
amp, the RF input should be swept while the voltage on VSET
is measured; that is, the SMA connector labeled VSET now acts
as an output. This is the simplest method to validate operation
of the evaluation board. When operated in this mode, a large
capacitor (0.01 mF or greater) must be installed in C4 (filter
capacitor) to ensure loop stability.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
EVAL-AD8315EB features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
REV. 0
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
Model
AD8315-EVAL
AD8315ACP-EVAL
VSET
RFIN
J1
J3
Figure 1. Evaluation Board Schematic (MSOP)
VPOS
SW1
AD8315 Evaluation Boards
0
R1
LK1
(OPEN)
C4
0.1 F
R2
52.3
C5
© 2003 Analog Devices, Inc. All rights reserved.
ORDERING GUIDE
1
2
3
4
NC = NO CONNECT
V
AD8031
RFIN
ENBL
VSET
FLTR
10k
POS
R5
AD8315
16.2k
0.1 F
EVAL-AD8315EB
R7
C3
COMM
VPOS
VAPC
Package Description
MSOP Evaluation Board
LFCSP Evaluation Board
NC
17.8k
R8
10k
8
7
6
5
R6
0.1 F
TP2
C1
(OPEN)
LK2
0
R3
R4
TP1
www.analog.com
V
C2
(OPEN)
POS
J2
VAPC
AD8315ACP-EVAL Summary of contents
Page 1
... Figure 1. Evaluation Board Schematic (MSOP) ORDERING GUIDE Model Package Description AD8315-EVAL MSOP Evaluation Board AD8315ACP-EVAL LFCSP Evaluation Board One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. C1 TP1 ...
Page 2
EVAL-AD8315EB Component Function TP1, TP2 Supply and Ground Vector Pins. SW1 Device Enable. When in Position A, the ENBL pin is connected to VPOS and the AD8315 is in operating mode. In Position B, the ENBL pin is grounded, putting ...