ADC1205 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 interface 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) requires the addition of a 5V negative supply. The ADC1205C and ADC1225C have a maximum non-linearity of 0.0224% of Full Scale.
ADC1205 Maximum Ratings
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications.
Supply Voltage (DVCC and AVCC).......... 6.5V
Negative Supply Voltage (V-)........ -15V to GND
Logic Control Inputs........... -0.3V to +15V
Voltage at Analog Inputs
[VIN(+), VIN(-)] ..........(V-)b0.3V to VCC+0.3V
Voltage at All Outputs, VREF, VOS ..-0.3V to (VCC+0.3)V
Input Current per Pin............... ±5mA
Input Current per Package ...... .....±20mA
Storage Temperature Range ..... .-65 to +150
Package Dissipation at TA=25......... 875 mW
Lead Temp. (Soldering, 10 seconds)........ 300
ESD Susceptibility (Note 12) .............800V
ADC1205 Features
`Compatible with all Ps
`True differential analog voltage inputs
` 0V to 5V analog voltage range with single 5V supply
`TTL/MOS input/output compatible
` Low powerÐ25 mW max
`Standard 24-pin or 28-pin DIP
ADC1205 Connection Diagram
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