UMDAS 0802DA User's Guide

Specifications

Analog output

Table 4-6. Analog output specifications

Parameter

Conditions

Specification

 

 

 

Resolution

 

12-bits, 1 in 4096

Output range

 

0 to 4.096 V, 1 mV per LSB.

Number of channels

 

2

Throughput (Note 5)

Software paced

250 S/s single channel typical, PC dependent

 

Single channel, continuous scan

10 kS/s

 

Dual channel, continuous scan,

5 kS/s

 

simultaneous update

 

Power on and reset voltage

 

0V, ±20 mV typ. (initializes to 000h code)

Output drive

Each D/A OUT

±15 mA

Slew rate

 

0.8 V/microsecond (µs) typ

Note 5: Maximum throughput scanning from PC memory is machine dependent. The rates specified are for Windows XP only. Maximum rates on operating systems that predate XP may be less and must be determined through testing on your machine.

Table 4-7. Analog output accuracy

Range

 

 

 

Accuracy (±LSB)

 

 

 

 

 

 

 

 

 

0 to 4.096 V

 

 

4.0 typ, 45.0 max

 

 

 

 

Table 4-8. Analog output accuracy components

 

 

 

 

 

 

 

 

Range

% of FSR (±)

 

 

Gain Error at FS (±mV)

Offset (±mV)

Accuracy at FS (±mV)

 

 

 

 

 

(Note 6)

 

0 to 4.096 V

0.1 typ, 0.9 max

 

 

4.0 typ, 36.0 max

1.0 typ, 9.0 max

4.0 typ, 45.0 max

Note 6: Zero-scale offsets may result in a fixed zero-scale error producing a "dead-band” digital input code region.. In this case, changes in digital input code at values less than 0x040 may not

produce a corresponding change in the output voltage. The UMDAS 0802DA offset error is tested and specified at code 0x040.

Digital input/output

 

 

Table 4-9. Digital I/O specifications

 

 

Digital type

CMOS

Number of I/O

16 (Port A0 through A7, Port B0 through B7)

Configuration

2 banks of 8

Pull-up/pull-down

All pins pulled up to Vs via 47 K resistors (default). Positions available for pull-down

configuration

to ground. Hardware selectable via zero ohm (Ω) resistors as a factory option.

Input high voltage

2.0 V min, 5.5 V absolute max

Input low voltage

0.8

V max, –0.5 V absolute min

Output high voltage

3.8

V min

(IOH = –2.5 mA)

 

 

Output low voltage

0.7

V max

(IOL = 2.5 mA)

 

 

Power on and reset state

Input

4-3