Analogue Control Interface

FX839

© 1997 Consumer Microcircuits Limited

18

D/839/4

Notes

Min.

Typ.

Max.

Units

ADCs and Multiplexed Inputs

(Guaranteed monotonic)

Resolution

10

Bits

Input signal 'linear rate of change'

0.27

mV/µs

12

µs

Integral non-linearity

2.0

LSBs

Differential non-linearity

1.0

LSBs

Zero error

-20

20

mV

1.0

TBD

MHz

Input Capacitance

TBD

pF

Variable Attenuators

Nominal Adjustment Range

(MOD1)

0

12.0

dB

(MOD2)

0

6.0

dB

Attenuation Accuracy

-1.0

1.0

dB

Step Size

(MOD1)

0.2

0.4

0.6

dB

(MOD2)

0.1

0.2

0.3

dB

Output Impedance

2

600

Ω

Bandwidth (-3dB)

2

100

kHz

Input Impedance (at 100Hz)

15.0

k

Ω

Magnitude Comparators and Interrupt

Request

Resolution

8

Bits

R2 = 22k

10%

'Off' State Leakage Current at IRQN

10

µA

Xtal/Clock Input

Frequency Range

4

0.5

6.0

MHz

'High' pulse width

40

ns

'Low' pulse width

40

ns

Input Impedance (at 100Hz)

10

M

Ω

Gain (I/P = 1mVrms at 100Hz)

20

dB

Notes:

1.

The extremes of the DAC output range, when resistively loaded, are affected by the output

impedance of the DAC buffer. Under these conditions the output impedance can approach

200

Ω. However, when the output is operating well within the supply, the closed loop output

impedance will be significantly lower thereby improving the loaded performance.

2.