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PDF ADC1205CCJ Data sheet ( Hoja de datos )
| Número de pieza | ADC1205CCJ | |
| Descripción | 12-Bit Plus Sign mP Compatible A/D Converters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 1994
ADC1205 ADC1225 12-Bit Plus Sign
mP Compatible A D Converters
General Description
The ADC1205 and ADC1225 are CMOS 12-bit plus sign
successive approximation A D converters The 24-pin
ADC1205 outputs the 13-bit data result in two 8-bit bytes
formatted high-byte first with sign extended The 28-pin
ADC1225 outputs a 13-bit word in parallel for direct inter-
face to a 16-bit data bus
Negative numbers are represented in 2’s complement data
format All digital signals are fully TTL and MOS compatible
A unipolar input (0V to 5V) can be accommodated with a
single 5V supply while a bipolar input (b5V to a5V) re-
quires the addition of a 5V negative supply
The ADC1205C and ADC1225C have a maximum non-lin-
earity of 0 0224% of Full Scale
Key Specifications
Y Resolution 12 bits plus sign
Y Linearity Error g1 LSB
Y Conversion Time 100 ms
Features
Y Compatible with all mPs
Y True differential analog voltage inputs
Y 0V to 5V analog voltage range with single 5V supply
Y TTL MOS input output compatible
Y Low power 25 mW max
Y Standard 24-pin or 28-pin DIP
Connection and Functional Diagrams
Dual-In-Line Package
Top View
Dual-In-Line Package
TL H 5676–1
Top View
TL H 5676–2
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 5676
See Ordering Information
TL H 5676 – 3
RRD-B30M115 Printed in U S A
1 page  
AC Electrical Characteristics (Continued)
Note 4 Two on-chip diodes are tied to each analog input as shown below
TL H 5676 – 4
Errors in the A D conversion can occur if these diodes are forward biased more than 50 mV This means that if AVCC and DVCC are minimum (4 75 VDC) and Vb is
minimum (b4 75VDC) full-scale must be s 4 8VDC
Note 5 A diode exists between analog VCC and digital VC
TL H 5676 – 20
To guarantee accuracy it is required that the AVCC and DVCC be connected together to a power supply with separate bypass filters at each VCC pin
Note 6 A diode exists between analog ground and digital ground
TL H 5676 – 21
To guarantee accuracy it is required that the analog ground and digital ground be connected together externally
Note 7 Accuracy is guaranteed at fCLKe1 0 MHz At higher clock frequencies accuracy may degrade
Note 8 Typicals are at 25 C and represent most likely parametric norm
Note 9 Tested and guaranteed to National’s AOQL (Average Outgoing Quality Level)
Note 10 Guaranteed but not 100% production tested These limits are not used to calculate outgoing quality levels
Note 11 Linearity error is defined as the deviation of the analog value expressed in LSBs from the straight line which passes through positive full scale and zero
after adjusting zero error (See Figures 1b and 1c )
Note 12 Human body model 100 pF discharged through a 1 5 kX resistor
FIGURE 1a Transfer Characteristic
5
TL H 5676 – 8
5 Page 
Functional Description (Continued)
FIGURE 10
TL H 5676 – 25
FIGURE 11
TL H 5676 – 26
FIGURE 12
11
TL H 5676 – 27
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ADC1205CCJ.PDF ] | |
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