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AD7843 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 AD7843은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 AD7843 자료 제공

부품번호 AD7843 기능
기능 Touch Screen Digitizer
제조업체 Analog Devices
로고 Analog Devices 로고


AD7843 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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AD7843 데이터시트, 핀배열, 회로
a
FEATURES
4-Wire Touch Screen Interface
Specified Throughput Rate of 125 kSPS
Low Power Consumption:
1.37 mW Max at 125 kSPS with VCC = 3.6 V
Single Supply, VCC of 2.2 V to 5.25 V
Ratiometric Conversion
High-Speed Serial Interface
Programmable 8- or 12-Bit Resolution
Two Auxiliary Analog Inputs
Shutdown Mode: 1 A max
16-Lead QSOP and TSSOP Packages
APPLICATIONS
Personal Digital Assistants
Smart Hand-Held Devices
Touch Screen Monitors
Point-of-Sales Terminals
Pagers
Touch Screen Digitizer
AD7843
FUNCTIONAL BLOCK DIAGRAM
+VCC
PENIRQ
X+
X–
Y+
Y–
IN3
IN4
VREF
AD7843
PEN
INTERRUPT
4-TO-1
I/P
MUX
T/H
COMP
CHARGE
REDISTRIBUTION
DAC
SAR + ADC
CONTROL LOGIC
GND
+VCC
GENERAL DESCRIPTION
The AD7843 is a 12-bit successive-approximation ADC with a
synchronous serial interface and low on resistance switches for
driving touch screens. The part operates from a single 2.2 V to
5.25 V power supply and features throughput rates greater than
125 kSPS.
The external reference applied to the AD7843 can be varied
from 1 V to +VCC, while the analog input range is from 0 V to
VREF. The device includes a shutdown mode that reduces the
current consumption to less than 1 µA.
The AD7843 features on-board switches. This coupled with low
power and high-speed operation make this device ideal for
battery-powered systems such as personal digital assistants with
resistive touch screens and other portable equipment. The part
is available in a 16-lead 0.15" Quarter Size Outline (QSOP) pack-
age and a 16-lead Thin Shrink Small Outline (TSSOP) package.
SPORT
DIN
CS
DOUT DCLK
BUSY
PRODUCT HIGHLIGHTS
1. Ratiometric conversion mode available eliminating errors
due to on-board switch resistances.
2. Maximum current consumption of 380 µA while operating at
125 kSPS.
3. Power-down options available.
4. Analog input range from 0 V to VREF.
5. Versatile serial I/O port.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000




AD7843 pdf, 반도체, 판매, 대치품
AD7843
ABSOLUTE MAXIMUM RATINGS1
(TA = 25°C unless otherwise noted)
+VCC to GND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Analog Input Voltage to GND . . . . . . . –0.3 V to VCC + 0.3 V
Digital Input Voltage to GND . . . . . . . –0.3 V to VCC + 0.3 V
Digital Output Voltage to GND . . . . . –0.3 V to VCC + 0.3 V
VREF to GND . . . . . . . . . . . . . . . . . . . . –0.3 V to VCC + 0.3 V
Input Current to Any Pin Except Supplies2 . . . . . . . ± 10 mA
Operating Temperature Range
Commercial . . . . . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
QSOP, TSSOP Package, Power Dissipation . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . 149.97°C/W (QSOP)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150.4°C/W (TSSOP)
θJC Thermal Impedance . . . . . . . . . . . . . 38.8°C/W (QSOP)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.6°C/W (TSSOP)
Lead Temperature, Soldering
Vapor Phase (60 secs) . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
NOTES
1Stresses above those listed under Absolute Maximum Rating 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 listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
2Transient currents of up to 100 mA will not cause SCR latch-up.
ORDERING GUIDE
Model
Temperature
Range
Linearity
Package
Error (LSB)1 Option
Package
Branding
Description Information
AD7843ARQ
AD7843ARQ-REEL
AD7843ARQ-REEL7
AD7843ARU
AD7843ARU-REEL
AD7843ARU-REEL7
EVAL-AD7843CB3
EVAL-CONTROL BRD24
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
Evaluation Board
Controller Board
±2
±2
±2
±2
±2
±2
RQ-162
RQ-162
RQ-162
RU-16
RU-16
RU-16
QSOP
QSOP
QSOP
TSSOP
TSSOP
TSSOP
AD7843ARQ
AD7843ARQ
AD7843ARQ
AD7843ARU
AD7843ARU
AD7843ARU
NOTES
1Linearity error here refers to integral linearity error.
2RQ = 0.15" Quarter Size Outline Package.
3This can be used as a stand-alone evaluation board or in conjunction with the EVALUATION BOARD CONTROLLER for evaluation/demonstration purposes.
4This EVALUATION BOARD CONTROLLER is a complete unit allowing a PC to control and communicate with all Analog Devices evaluation boards ending in the
CB designators.
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 AD7843 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.
WARNING!
ESD SENSITIVE DEVICE
PIN CONFIGURATION QSOP/TSSOP
+VCC 1
X+ 2
16 DCLK
15 CS
Y+ 3
14 DIN
X4 AD7843 13 BUSY
TOP VIEW
Y5 (Not to Scale) 12 DOUT
GND 6
11 PENIRQ
IN3 7
IN4 8
10 +VCC
9 VREF
–4– REV. 0

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AD7843 전자부품, 판매, 대치품
7.5
6.5
5.5
4.5
3.5
2.5
1.5
0.5
10 25 40 55 70 85 100 115 130
SAMPLE RATE kHz
TPC 7. Reference Current vs. Sample Rate
AD7843
14
13
12
11
10
9
8
7
6
5
4
3
2
40
20
0 20 40 60 80
TEMPERATURE ؇C
TPC 10. Reference Current vs. Temperature
10
9 Y+
X+
8
7
6 X
Y
5
4
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
+VCC V
TPC 8. Switch-On-Resistance vs. +VCC (X+, Y+: +VCC to
Pin; X–, Y–: Pin to GND)
2.0
1.8
1.6
INL: R = 2k
1.4
1.2
INL: R = 500
1.0
0.8
DNL: R = 2k
0.6
0.4
DNL: R = 500
0.2
0
15 35 55 75 95 115 135 155 175 195
SAMPLING RATE kSPS
TPC 9. Maximum Sampling Rate vs. RIN
9
8
Y+
X+
7
X
6
Y
5
4
3
40 20
0 20 40 60
TEMPERATURE ؇C
80 100
TPC 11. Switch-On-Resistance vs. Temperature (X+, Y+:
+VCC to Pin; X–, Y–: Pin to GND)
0
fSAMPLE = 125kHz
20
fIN = 15kHz
SNR = 68.34dB
40
60
80
100
120
0
7.50 15.0 22.5 30.0 37.5 45.0 52.5 60.0
FREQUENCY kHz
TPC 12. Auxiliary Channel Dynamic Performance
REV. 0
–7–

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