WM0834 データシートの表示（PDF） - Wolfson Microelectronics plc

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WM0834

8-Bit ADCs with Serial Interface and Configurable Input Multiplexer

Wolfson Microelectronics plc 

WM0834, WM0838

Electrical Characteristics (continued)

Notes:

1. Absolute Maximum Ratings are stress ratings only.

Permanent damage to the device may be caused by

continuously operating at or beyond these limits. De-

vice functional operating range limits are given under

Recommended Operating Conditions. Guaranteed

performance specifications are given under Electrical

Characteristics at the test conditions specified.

2. All voltage values, except differential voltages are with

respect to the ground.

3. When the input voltage VIN at any pin exceeds the

power supply rails (GND > V > V ) the absolute value

IN

CC

of current at that pin should be limited to 5 mA or less.

The 20 mA package input current limits the number of

pins that can exceed the power supply boundaries

with a 5 mA supply current to four.

4. A clock duty cycle range of 40% to 60% ensures

correct operation at all clock frequencies. For a clock

with a duty cycle outside these limits, the minimum time

the clock is high or low must be at least 666 ns, with

the maximum time for clock high or low being 60 ms.

5. All typical values are at VCC = 5 V, TA = 25oC for 5V

devices and VCC = 3.3 V, TA = 25oC for 3.3V devices.

6. All parameters are measured under open-loop

conditions with zero common mode input voltage

(unless otherwise stated).

7. Total Unadjusted Error (TUE) is the sum of integral lin-

earity error, zero code error and full scale error over

the output code range.

8. A Differential linearity of "n" bits ensures a code width

exist to "n" bits. Hence a Differential Linearity of 8 bits

for an 8 bit ADC guarantees no missing codes.

9. For VIN(-) greater than or equal to VIN(+) the digital out-

put code will be 00 Hex. Connected to each analogue

input are two diodes which will forward conduct for a

diode drop outside the supply rails, VCC and GND. If an

analogue input voltage does not exceed the supply volt-

age by more than 50 mV, the output code will be cor-

rect. To use an absolute input voltage range of 0 to VCC

a minimum V - 0.05 V is required for all variations of

CC

temperature. Care should be exercised when testing at

low VCC levels with a maximum analogue voltage as

this can cause the input diode to conduct, especially at

high temperature, and cause errors for analogue inputs

near full scale.

10. Standby input leakage currents, are currents going in

or out of the on or off channels when the ADC is not

performing conversion and the clock input is in a high

or low steady-state condition.

Wolfson Microelectronics

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