TMS370Cx32

8-BIT MICROCONTROLLER

SPNS015C – FEBRUARY 1990 – REVISED FEBRUARY 1997

39

POST OFFICE BOX 1443

ADC1 converter

Resolution

8-bits (256 values)

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Monotonic

Yes

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output conversion mode

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Conversion time (excluding sample time)

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

recommended operating conditions

MIN

NOM

MAX

UNIT

VCC3 Analog supply voltage

4.5

5

5.5

V

VCC3 Analog supply voltage

VCC1–0.3

VCC1+0.3

V

VSS3

Analog ground

VSS1–0.3

VSS1+0.3

V

Vref

Non-VCC3 reference†

2.5

VCC3

VCC3 + 0.1

V

Analog input for conversion

VSS3

Vref

V

† Vref must be stable, within ± 1/2 LSB of the required resolution, during the entire conversion time.

operating characteristics over recommended ranges operating conditions

PARAMETER

MIN

MAX

UNIT

Absolute accuracy‡

VCC3 = 5.5 V

Vref = 5.1 V

±1.5

LSB

Differential/integral linearity error‡§

VCC3 = 5.5 V

Vref = 5.1 V

±0.9

LSB

ICC3

Analog supply current

Converting

2

mA

ICC3

Analog supply current

Nonconverting

5

µA

II

Input current, AN0 – AN7

0 V

≤ VI ≤ 5.5 V

2

µA

Iref

Input charge current

1

mA

Z f

Source impedance of V f

SYSCLK

≤ 3 MHz

24

k

Ω

Zref

Source impedance of Vref

3 MHz < SYSCLK

≤ 5 MHz

10

k

Ω

‡ Absolute resolution = 20 mV. At Vref = 5 V, this is one LSB. As Vref decreases, LSB size decreases; therefore, the absolute accuracy and

differential/integral linearity errors in terms of LSBs increase.

§ Excluding quantization error of 1/2 LSB