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PDF ADC0852 Data sheet ( Hoja de datos )
| Número de pieza | ADC0852 | |
| Descripción | Multiplexed Comparator with 8-Bit Reference Divider | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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April 1995
ADC0852 ADC0854
Multiplexed Comparator with 8-Bit Reference Divider
General Description
The ADC0852 and ADC0854 are CMOS devices that com-
bine a versatile analog input multiplexer voltage compara-
tor and an 8-bit DAC which provides the comparator’s
threshold voltage (VTH) The comparator provides a ‘‘1-bit’’
output as a result of a comparison between the analog input
and the DAC’s output This allows for easy implementation
of set-point on-off or ‘‘bang-bang’’ control systems with
several advantages over previous devices
The ADC0854 has a 4 input multiplexer that can be software
configured for single ended pseudo-differential and full-dif-
ferential modes of operation In addition the DAC’s refer-
ence input is brought out to allow for reduction of the span
The ADC0852 has a two input multiplexer that can be con-
figured as 2 single-ended or 1 differential input pair The
DAC reference input is internally tied to VCC
The multiplexer and 8-bit DAC are programmed via a serial
data input word Once programmed the output is updated
once each clock cycle up to a maximum clock rate of
400 kHz
Features
Y 2 or 4 channel multiplexer
Y Differential or Single-ended input software controlled
Y Serial digital data interface
Y 256 programmable reference voltage levels
Y Continuous comparison after programming
Y Fixed ratiometric or reduced span reference capability
(ADC 0854)
Key Specifications
Y Accuracy g LSB or g 1 LSB of Reference (0 2%)
Y Single 5V power supply
Y Low Power 15 mW
TL H 5521 – 1
FIGURE 1 ADC0854 Simplified Block Diagram (ADC0852 has 2 input channels
COM tied to GND VREF tied to VCC Va omitted and one GND connection)
2 Channel and 4 Channel Pin Out
ADC0852 2-CHANNEL MUX
Dual-In-Line Package
ADC0854 4-CHANNEL MUX
Dual-In-Line Package
Top View
TL H 5521 – 10
AGND and COM internally connected to GND
VREF internally connected to VCC
Order Number ADC0852
See NS Package Number N08E
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 5521
Top View
TL H 5521 – 11
Order Number ADC0854
See NS Package Number N14A
RRD-B30M75 Printed in U S A
1 page  
Typical Performance Characteristics
Internal DAC Linearity
Error vs VREF Voltage
Internal DAC Linearity
Error vs Temperature
Comparator Error vs fCLK
Output Current vs
Temperature
Comparator Offset vs
Temperature
IREF Reference
Current vs Temp ADC0854
ICC Power Supply Current
vs Temperature ADC0854
ICC Power Supply
Current vs fCLK ADC0854
For ADC0852 add IREF
TL H 5521 – 2
5
5 Page 
Functional Description (Continued)
TABLE I MUX Addressing ADC0854
Single-Ended MUX Mode
MUX Address
Channel
SGL ODD
SELECT 0 1 2 3 COM
DIF SIGN
10
0a
b
10
1
ab
11
0
a
b
11
1
ab
Differential MUX Mode
MUX Address
Channel
SGL ODD
SELECT 0 1 2
DIF SIGN
00
0 ab
00
1
a
01
0 ba
01
1
b
3
b
a
4 Single-Ended
TABLE II MUX Addressing ADC0852
Single Ended MUX Mode
MUX Address
SGL
DIF
ODD
SIGN
10
11
Channel
01
a
a
COM is internally tied to A GND
Differential MUX Mode
MUX Address
SGL
DIF
ODD
SIGN
00
01
Channel
01
ab
ba
4 Pseudo-Differential
2 Differential
Mixed Mode
FIGURE 6 Analog Input Multiplexer Options for the ADC0854
TL H 5521 – 15
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADC0852.PDF ] | |
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