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ADC0820BCN 데이터시트 PDF




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부품번호 ADC0820BCN 기능
기능 8-Bit High Speed P Compatible A/D Converter with Track/Hold Function
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ADC0820BCN 데이터시트, 핀배열, 회로
June 1999
ADC0820
8-Bit High Speed µP Compatible A/D Converter with
Track/Hold Function
General Description
By using a half-flash conversion technique, the 8-bit
ADC0820 CMOS A/D offers a 1.5 µs conversion time and
dissipates only 75 mW of power. The half-flash technique
consists of 32 comparators, a most significant 4-bit ADC and
a least significant 4-bit ADC.
The input to the ADC0820 is tracked and held by the input
sampling circuitry eliminating the need for an external
sample-and-hold for signals moving at less than 100 mV/µs.
For ease of interface to microprocessors, the ADC0820 has
been designed to appear as a memory location or I/O port
without the need for external interfacing logic.
Key Specifications
n Resolution
n Conversion Time
n Low Power
n Total Unadjusted
Error
8 Bits
2.5 µs Max (RD Mode)
1.5 µs Max (WR-RD Mode)
75 mW Max
±12 LSB and ± 1 LSB
Features
n Built-in track-and-hold function
n No missing codes
n No external clocking
n Single supply — 5 VDC
n Easy interface to all microprocessors, or operates
stand-alone
n Latched TRI-STATE® output
n Logic inputs and outputs meet both MOS and T2L
voltage level specifications
n Operates ratiometrically or with any reference value
equal to or less than VCC
n 0V to 5V analog input voltage range with single 5V
supply
n No zero or full-scale adjust required
n Overflow output available for cascading
n 0.3" standard width 20-pin DIP
n 20-pin molded chip carrier package
n 20-pin small outline package
n 20-pin shrink small outline package (SSOP)
Connection and Functional Diagrams
Dual-In-Line, Small Outline
and SSOP Packages
Molded Chip Carrier
Package
Top View
DS005501-1
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS005501
DS005501-33
www.national.com




ADC0820BCN pdf, 반도체, 판매, 대치품
DC Electrical Characteristics
The following specifications
limits TA=TJ=25˚C.
apply
for
VCC=5V,
unless
otherwise
specified.
Boldface
limits
apply
from
TMIN
to
TMAX;
all
other
Parameter
Conditions
ADC0820CCJ
ADC0820BCN, ADC0820CCN
ADC0820BCV, ADC0820BCWM
Limit
Units
ADC0820CCWM, ADC0820CIWM
Typ
Tested
Design
Typ
Tested
Design
(Note 6)
Limit
Limit
(Note 6)
Limit
Limit
(Note 7) (Note 8)
(Note 7)
(Note 8)
VIN(1), Logical “1”
Input Voltage
VCC=5.25V
CS , WR , RD
Mode
2.0
3.5
2.0 2.0 V
3.5 3.5 V
VIN(0), Logical “0”
Input Voltage
VCC=4.75V
CS , WR , RD
Mode
0.8
1.5
0.8 0.8 V
1.5 1.5 V
IIN(1), Logical “1”
Input Current
IIN(0), Logical “0”
Input Current
VIN(1)=5V; CS , RD
VIN(1)=5V; WR
VIN(1)=5V; Mode
VIN(0)=0V; CS , RD , WR ,
Mode
0.005
0.1
50
−0.005
1
3
200
−1
0.005
0.1
50
−0.005
0.3
170
1 µA
3 µA
200 µA
−1 µA
VOUT(1), Logical “1”
Output Voltage
VCC=4.75V, IOUT=−360 µA;
DB0–DB7, OFL , INT
2.4
2.8 2.4 V
VCC=4.75V, IOUT=−10 µA;
DB0–DB7, OFL , INT
4.5
4.6 4.5 V
VOUT(0), Logical “0”
Output Voltage
VCC=4.75V, IOUT=1.6 mA;
DB0–DB7, OFL , INT , RDY
0.4
0.34 0.4 V
IOUT, TRI-STATE
Output Current
ISOURCE, Output
Source Current
VOUT=5V; DB0–DB7, RDY
VOUT=0V; DB0–DB7, RDY
VOUT=0V; DB0–DB7, OFL
INT
0.1
−0.1
−12
−9
3
−3
−6
−4.0
0.1
−0.1
−12
−9
0.3
−0.3
−7.2
−5.3
3
−3
−6
−4.0
µA
µA
mA
mA
ISINK, Output Sink
Current
VOUT=5V; DB0–DB7, OFL ,
INT , RDY
14 7
14 8.4
7 mA
ICC, Supply Current
CS =WR =RD =0
7.5 15
7.5 13
15 mA
AC Electrical Characteristics
The following specifications apply for VCC=5V, tr=tf=20 ns, VREF(+)=5V, VREF(−)=0V and TA=25˚C unless otherwise speci-
fied.
Typ
Tested
Design
Parameter
Conditions
(Note 6)
Limit
Limit
Units
(Note 7)
(Note 8)
tCRD, Conversion Time for RD
Mode
Pin 7 = 0, Figure 2
1.6
2.5 µs
tACC0, Access Time (Delay from
Falling Edge of RD to Output
Valid)
Pin 7 = 0, Figure 2
tCRD+20
tCRD+50
ns
tCWR-RD, Conversion Time for
WR-RD Mode
tWR, Write Time
Min
Max
Pin 7 = VCC; tWR = 600 ns,
tRD=600 ns; Figures 3, 4
Pin 7 = VCC; Figures 3, 4
(Note 4) See Graph
1.52
µs
600
50
ns
µs
tRD, Read Time
Min
tACC1, Access Time (Delay from
Falling Edge of RD to Output
Valid)
Pin 7 = VCC; Figures 3, 4
(Note 4) See Graph
Pin 7 = VCC, tRD<tI; Figure 3
CL=15 pF
600 ns
190 280 ns
CL=100 pF
210 320 ns
www.national.com
4

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ADC0820BCN 전자부품, 판매, 대치품
Timing Diagrams (Continued)
DS005501-8
FIGURE 3. WR-RD Mode (Pin 7 is High and tRD<tI)
DS005501-9
FIGURE 4. WR-RD Mode (Pin 7 is High and tRD>tI)
DS005501-10
FIGURE 5. WR-RD Mode (Pin 7 is High)
Stand-Alone Operation
7 www.national.com

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