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AD8488 の電気的特性と機能

AD8488のメーカーはAnalog Devicesです、この部品の機能は「128-Channel Digital X-Ray Analog Front End」です。


製品の詳細 ( Datasheet PDF )

部品番号 AD8488
部品説明 128-Channel Digital X-Ray Analog Front End
メーカ Analog Devices
ロゴ Analog Devices ロゴ 




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AD8488 Datasheet, AD8488 PDF,ピン配置, 機能
Data Sheet
FEATURES
128 integrator channels
Correlated double sample error correction (CDS)
Corrects for VOS and LF noise
Power consumption per channel
Normal: 11 mW
Low power: 4 mW
Low input leakage current: −1.5 pA typical
Low input referred noise (QNI): 993 erms typical
Linearity error: 0.03% typical
Compact 17 mm × 17 mm BGA
Selectable filter time constants
4 selectable input charge ranges
10 selectable gain ranges
APPLICATION
High performance digital X-ray systems
Medical X-ray
Security (baggage scanner) systems
128-Channel
Digital X-Ray Analog Front End
AD8488
GENERAL DESCRIPTION
The AD8488 is a 128-channel, analog front end (AFE) designed for
use in high performance digital X-ray systems. The analog channels
consist of an integrator followed by a gain selectable single-ended
to low impedance differential output. The analog channel converts
the charge acquired by X-ray or photodiode detectors to a voltage.
The channels are composed of CMOS transistors, using typical
high input impedance CMOS gates. The integrators generate charge
dependent voltages using a range of selectable capacitance values that
accommodate a broad range of input charge values. The integrators
are followed by single-ended input to differential output voltage
amplifiers where offset and low frequency noise voltages are
subtracted from the input voltages. A 128:1 channel differential
MUX follows the buffers and drives the analog output buffer.
Switch drivers and certain digital timing functions are included, and
all are mounted on a 255-lead BGA substrate. Charge conversion
for all 128 channels is simultaneous followed by a sequential voltage
output read of the channels using a 7-bit address code. The sequence
occurs twice, sampling all 128 channels. Logic control inputs, CS_A
and CS_B, select the lower and upper 64 blocks of the channel
addresses.
The AD8488 is packaged in a 17 mm × 17 mm, 255-lead, RoHS-
compliant ball grid array (BGA). The operating temperature range
is 0°C to 85°C ambient.
IN0:127
ANALOG
INPUTS
VREF
FUNCTIONAL BLOCK DIAGRAM
CHARGE CONVERSION AMPLIFIER
128 CHANNELS
DIFFERENTIAL
OUTPUT
IINNTT
LPF GAIN AMPLIFIER
MULTIPLEXER
128:1
TIMING SIGNALS
128
TIMING AND CONTROL
7
CONTROL REGISTER
MUX SELECTOR
2427
OUTPUT
BUFFER
OUTHI
OUTLO
Figure 1.
CONTROL SIGNALS
Rev. A
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.

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AD8488 pdf, ピン配列
AD8488
TABLE OF CONTENTS
Features ...................................................................................................1
Application .............................................................................................1
General Description ..............................................................................1
Functional Block Diagram ...................................................................1
Table of Contents ...................................................................................2
Revision History ....................................................................................2
Specifications..........................................................................................3
Absolute Maximum Ratings.................................................................5
Thermal Data .....................................................................................5
Thermal Characterization ................................................................5
ESD Caution.......................................................................................5
Pin Configuration and Function Descriptions..................................6
Signal Mnemonics .................................................................................9
REVISION HISTORY
6/12—Revision A: Initial Version
Data Sheet
Typical Performance Characteristics ................................................11
Theory of Operation ...........................................................................13
Overview ..........................................................................................13
Analog Amplifier ........................................................................13
Troubleshooting Channels.........................................................13
Timing Signals .................................................................................14
Timing Notes ...............................................................................14
Applications Information ...................................................................15
Control Register Bit Maps..............................................................15
Timing Diagrams ............................................................................17
Outline Dimensions............................................................................18
Ordering Guide ...............................................................................18
Rev. A| Page 2 of 20


3Pages


AD8488 電子部品, 半導体
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Voltage
Supply (AVDD, DVDD)
Charge Input IN0 to IN127
Reference (VREF, VREF_ESD)
Logic Inputs
Maximum Junction Temperature
Storage Temperature Range
Input Charge to Integrator Channels
Rating
5.5 V
−0.3 V to VREF + 0.3 V
5.5 V
−0.3 V to +5.5 V
125°C
−30°C to +150°C
20 pC
Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. This is a stress rating only;
functional operation of the device at these or any other conditions
above those indicated in the operational section of this
specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect device
reliability.
THERMAL DATA
ΨJB is the junction-to-board thermal characterization parameter
with a unit of °C/W. The ΨJB of the package is based on modeling
and calculation using a 4-layer board. The JESD51-12, Guidelines
for Reporting and Using Package Thermal Information, states that
thermal characterization parameters are not the same as thermal
resistances. ΨJB measures the component power flowing through
multiple thermal paths rather than a single path, as in thermal
resistance, θJB. Therefore, ΨJB thermal paths include convection
from the top of the package as well as radiation from the package,
factors that make ΨJB more useful in real-world applications.
Maximum junction temperature (TJ) is calculated from the board
temperature (TB) and power dissipation (PD) using the formula
TJ = TB + (PD × ΨJB)
Refer to JESD51-8 and JESD51-12 for more detailed information
about ΨJB.
AD8488
THERMAL CHARACTERIZATION
Table 3. Thermal Resistance—Normal Operation (1.4 W)
Airflow Velocity
(m/sec)
Ambient θJA ΨJT ΨJB θJC Unit
0 85°C 18.6 0.20 8.3 4.4 °C/W
50°C 19.7 0.17 8.3 4.4 °C/W
25°C 20.6 0.16 8.3 4.4 °C/W
1 85°C 15.8 0.32 8.2 4.4 °C/W
50°C 16.1 0.30 8.2 4.4 °C/W
25°C 16.4 0.29 8.2 4.4 °C/W
3 85°C 13.8 0.54 7.7 4.4 °C/W
50°C 14.0 0.53 7.7 4.4 °C/W
25°C 14.2 0.52 7.7 4.4 °C/W
Table 4. Thermal Resistance—Low Power Operation (0.5 W)
Airflow Velocity
(m/sec)
Ambient θJA ΨJT ΨJB θJC Unit
0 85°C 19.0 0.19 8.3 4.4 °C/W
50°C 20.2 0.16 8.3 4.4 °C/W
25°C 21.2 0.15 8.3 4.4 °C/W
1 85°C 15.7 0.31 8.1 4.4 °C/W
50°C 16.2 0.29 8.1 4.4 °C/W
25°C 16.4 0.28 8.1 4.4 °C/W
3 85°C 13.8 0.54 7.8 4.4 °C/W
50°C 14.1 0.52 7.8 4.4 °C/W
25°C 14.2 0.51 7.8 4.4 °C/W
Note that the thermal numbers are simulated per JEDEC JESD51-9
on a 4-layer printed circuit board size = 101.5 mm × 114.5 mm.
ESD CAUTION
Rev. A | Page 5 of 20

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AD8488

128-Channel Digital X-Ray Analog Front End

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