7820RPDE [MAXWELL]
Microprocessor-compatible 8-Bit ADC; 微处理器兼容的8位ADC
| 型号： | 7820RPDE |
| 厂家： | 
MAXWELL TECHNOLOGIES |
| 描述： | Microprocessor-compatible 8-Bit ADC |
| 文件： | 总18页 (文件大小：245K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
7820
Microprocessor-compatible 8-Bit ADC
TABLE 1. PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
2
3
4
5
6
7
V
Analog Input Range: VREF(-) to V
.
IN
REF(+)
DB0
DB1
DB2
DB3
Data Output. Three State Output, bit 0 (LSB)
Data Output. Three State Output, bit 1
Data Output. Three State Output, bit 2
Data Output. Three State Output, bit 3
WR/RDY WRITE control input/READY status output.
Mode
Mode Selection Input. It determines whether the device operates in the
WR-RD or RD mode. It is internally tied to GND through a 50 µA current
source.
8
9
RD
INT
READ Input. RD must be low to access data from the part.
INTERUPT Output. INT going low indicates that the conversion is com-
plete INT returns high on rising the edge of RD or CS.
10
11
12
13
GND
Ground
V
Lower limit of reference span. Range: GND < VREF(-) < V
REF-
REF(+)
V
Upper limit of reference span. Range: GND < VREF(-) < VREF(+) < V
REF+
DD
CS
Chip Select Input. CS, the decoded device address, must be low for RD
or WR to be recognized by the converter.
14
15
16
17
18
DB4
DB5
DB6
DB7
OFL
Data Output. Three State Output, bit 4
Data Output. Three State Output, bit 5
Data Output. Three State Output, bit 6
Data Output. Three State Output, bit 7 (MSB)
Overflow Output. If the analog input is higher than (VREF(+) - 1/2LSB),
OFL will be low at the end of conversion. It is a non three state output
which can be used to cascade 2 or more devices to increase resolution.
19
20
NC
No Connection.
V
Power supply voltage, +5V
DD
1
TABLE 2. 7820 ABSOLUTE MAXIMUM RATINGS
PARAMETER
MIN
MAX
UNIT
V
DD to GND
-0
7.0
V
V
V
V
V
Digital Input Voltage to GND (Pins 6-80, 13)
-0.3
0.3
0
V
DD +0.3
DD +0.3
DD +0.3
REF (+)
Digital Output Voltage to GND (Pins 2-5, 9, 14-18)
V
VREF (+) to GND
V
VREF (-) to GND
V -0.3
V
SS
09.09.03 Rev 3
All data sheets are subject to change without notice
2
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
1
TABLE 2. 7820 ABSOLUTE MAXIMUM RATINGS
PARAMETER
MIN
MAX
UNIT
V to GND
-0.3
-55
-65
--
V
DD +0.3
125
150
450
6
V
°C
IN
Operating Temperature
Storage Temperature Range
Power Dissipation to 75°C
Derates above +75°C
°C
mW
--
mW/°C
1. CAUTION: ESD (electrostatic discharge) sensitive device. The digital control inputs are diode protected; how-
ever, permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused
devices must be stored in conductive foam or shunts. The protective foam should be discharged to the destina-
tion socket before devices are inserted.
TABLE 3. 7820 DC ELECTRICAL CHARACTERISTICS
(VDD = +5V; VREF(+) = +5V; VREF(-) = GND = 0V, UNLESS OTHERWISE SPECIFIED) (RD MODE (PIN 7 = 0V))
(TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)
PARAMETER
TEST CONDITIONS
SUBGROUPS
MIN
TYP
MAX
UNIT
Accuracy
Resolution
--
--
--
8
--
--
--
--
--
--
±1.0
8
Bits
LSB
Bits
Total Unadjusted Error1
Minimum Resolution for which No
Missing Codes are Guaranteed
Reference Input
Input Resisitance
--
--
--
1, 2, 3
1, 2, 3
1, 2, 3
1.0
--
--
--
4.0
kΩ
V
VREF (+) Input Voltage Range
VREF(-)
V
DD
VREF (-) Input Voltage Range
GND
V
REF(+)
V
Analog Input
Input Voltage Range
Input Leakage Current
Input Capacitance2
Logic Inputs
--
--
--
1, 2, 3
1, 2, 3
1, 2, 3
V
REF(-)
--
--
V
REF(+)
V
µA
pF
--
±3
--
45
--
CS, WR, RD
V
--
--
--
--
--
--
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
2.4
--
--
--
--
--
--
5
--
0.8
1
V
V
INH
V
INH
IINH(CS, RD)
--
µA
µA
µA
pF
IINH(WR)
--
3
I (WR)
--
-1
8
INL
Input Capacitance2
--
09.09.03 Rev 3
All data sheets are subject to change without notice
3
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
TABLE 3. 7820 DC ELECTRICAL CHARACTERISTICS
(VDD = +5V; VREF(+) = +5V; VREF(-) = GND = 0V, UNLESS OTHERWISE SPECIFIED) (RD MODE (PIN 7 = 0V))
(TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)
PARAMETER
TEST CONDITIONS
SUBGROUPS
MIN
TYP
MAX
UNIT
Mode
V
--
--
--
--
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
3.5
--
--
--
--
5
--
200
-1
V
INH
I
µA
µA
pF
INH
I
--
INL
Input Capacitance2
--
8
Logic Outputs
DB0-DB7, OFL, INT
V
ISOURCE =
360 µA
1, 2, 3
4
--
--
V
OH
V
ISINK = 1.6 mA
1, 2, 3
1, 2, 3
--
--
--
--
0.4
±3
V
OL
IOUT(DB0-DB7)
Floating State
Leakage
µA
Output Capacitance2
--
1, 2, 3
--
5
8
pF
RDY
V
ISINK = 2.6mA
1, 2, 3
1, 2, 3
--
--
--
--
0.4
±3
V
V
OL
IOUT
Floating State
Leakage
Output Capacitance2
Slew Rate, Tracking2
Power Supply
--
--
4, 5, 6
1, 2, 3
--
--
5
8
pF
0.2
0.1
V/µs
V
±5% for speci-
fied perfor-
mance
1, 2, 3
--
--
5
V
DD
IDD
CS = RD = OV
--
1, 2, 3
1, 2, 3
1, 2, 3
--
--
--
--
40
20
--
mA
mW
LSB
Power Dissipation
Power Supply Sensitivity
VDD = 5V ±5%
±1/16
±1/4
1. Total unadjusted error includes offset, full scale and linearity error.
2. Guarenteed by design.
09.09.03 Rev 3
All data sheets are subject to change without notice
4
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
1
TABLE 4. 7820 AC ELECTRICAL CHARACTERISTICS
(VDD = +5V; VREF(+) = +5V; VREF(-) = GND = 0V, UNLESS OTHERWISE SPECIFIED) (RD MODE (PIN 7 = 0V))
(TA = -55 TO 125 °C UNLESS OTHERWISE SPECIFIED)
PARAMETER
SUBGROUPS
SYMBOL
MIN
MAX
UNIT
CS to RD/WR Setup Time
CS to RD/WR Hold Time
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
tCSS
tCSH
tRDY
tCRD
tACCD
tINTH
tDH
0
0
--
--
ns
ns
ns
µs
ns
ns
ns
ns
ns
µs
ns
ns
ns
ns
ns
ns
ns
CS to Delay Time (Pull-up Resistor = 5kΩ
Conversion Time (RD Mode)
Data Access Time (RD Mode)
RD to INT Delay (RD Mode)
Data Hold Time
--
100
2.5
--
--
tCRD + 50
225
100
--
--
--
Delay Time Between Conversions
Write Pulse Width
tp
600
600
--
tWR
--
50
Delay Time Between WR and RD Pulses
Data Access Time (WR-RD Mode)
RD to INT Delay
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
9, 10, 11
tRD
tACC1
tR1
700
--
--
250
225
1700
110
150
75
--
WR to INT Delay
tINTL
tACC2
tIHWR
tID
--
Data Access Time (WR-RD Mode)
WR to INT Delay (Stand-Alone Operation)
Data Access Time After INT (Stand-Alone Operation
--
--
--
1. Sample tested at 25°C to ensure compliance. Only on process design change.
09.09.03 Rev 3
All data sheets are subject to change without notice
5
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 1. LOAD CIRCUITS FOR DATA ACCESS TIME TEST
FIGURE 2. LOAD CIRCUITS FOR DATA HOLD TIME RESET
09.09.03 Rev 3
All data sheets are subject to change without notice
6
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 3. LOAD CIRCUIT FOR ACCESS TIME
FIGURE 4. LOAD CIRCUIT FOR OUTPUT FLOAT DELAY
09.09.03 Rev 3
All data sheets are subject to change without notice
7
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 5. ACCURACY VS. TWR
FIGURE 6. ACCURACY VS. TRD
09.09.03 Rev 3
All data sheets are subject to change without notice
8
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 7. ACCURACY VS. TSP
FIGURE 8. ACCURACY VS. TREF [V = V (+) - V (-)]
REF
REF
REF
09.09.03 Rev 3
All data sheets are subject to change without notice
9
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 9. SIGNAL-NOISE RATIO VS. INPUT FREQUENCY
FIGURE 10. TINTL INTERNAL TIME DELAY VS. TEMPERATURE
09.09.03 Rev 3
All data sheets are subject to change without notice 10
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 11. OUTPUT CURRENT VS. TEMPERATURE
FIGURE 12. OPERATING SEQUENCE (WR-RD MODE)
09.09.03 Rev 3
All data sheets are subject to change without notice 11
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 13. RD MODE
FIGURE 14. WR-RD MODE (TRD>TINTL)
09.09.03 Rev 3
All data sheets are subject to change without notice 12
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 15. WR-RD MODE (TRD<T )
INTL
FIGURE 16. WR-RD MODE STAND-ALONE OPERATION (CS=RD=0)
09.09.03 Rev 3
All data sheets are subject to change without notice 13
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 17. POWER SUPPLY AS REFERENCE
FIGURE 18. INPUT NOT REFERENCED TO GND
09.09.03 Rev 3
All data sheets are subject to change without notice 14
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
FIGURE 19. EQUIVALENT INPUT CIRCUIT
FIGURE 20. RC NETWORK MODEL
09.09.03 Rev 3
All data sheets are subject to change without notice 15
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
20 PIN RAD-PAK® DUAL IN LINE PACKAGE
DIMENSION
SYMBOL
MIN
NOM
MAX
A
b
--
0.202
0.018
0.230
0.026
0.065
0.018
1.060
0.310
0.014
0.045
0.008
--
b2
c
0.050
0.010
D
1.000
E
0.220
0.295
eA
eA/2
e
0.300 BSC
0.150 BSC
0.100 BSC
0.145
L
0.135
0.015
0.005
0.005
0.155
0.070
--
Q
0.045
S1
S2
N
0.025
--
--
20
Note: All dimensions in inches
09.09.03 Rev 3
All data sheets are subject to change without notice 16
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
Important Notice:
These data sheets are created using the chip manufacturer’s published specifications. Maxwell Technologies verifies
functionality by testing key parameters either by 100% testing, sample testing or characterization.
The specifications presented within these data sheets represent the latest and most accurate information available to
date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no
responsibility for the use of this information.
Maxwell Technologies’ products are not authorized for use as critical components in life support devices or systems
without express written approval from Maxwell Technologies.
Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech-
nologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.
09.09.03 Rev 3
All data sheets are subject to change without notice 17
©2003 Maxwell Technologies
All rights reserved.
7820
Microprocessor-compatible 8-Bit ADC
Product Ordering Options
Model Number
7820
RP
D
X
Option Details
Feature
Monolithic
Screening Flow
S = Maxwell Class S
B = Maxwell Class B
I = Industrial (testing @ -55°C,
+25°C, +125°C)
E = Engineering (testing @ +25°C)
D = Dual In-line Package (DIP)
RP = RAD-PAK® package
Package
Radiation Feature
Microprocessor-Compatible 8-Bit
ADC
Base Product
Nomenclature
09.09.03 Rev 3
All data sheets are subject to change without notice 18
©2003 Maxwell Technologies
All rights reserved.
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