ADC08131 datasheet(4/24 Pages) TI1

Part #	ADC08131

Description	8-Bit High-Speed Serial I/O A/D Converters

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Manufacturer	TI1 [Texas Instruments]

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OBSOLETE

ADC08131, ADC08134, ADC08138

SNAS066D – JUNE 1999 – REVISED APRIL 2013

www.ti.com

Electrical Characteristics

The following specifications apply for VCC = +5 VDC, VREF = +2.5 VDC and fCLK = 1 MHz unless otherwise specified. Boldface

limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25°C.

Units

Symbol

Parameter

Conditions

Typical(1)

Limits(2)

(Limits)

CONVERTER AND MULTIPLEXER CHARACTERISTICS

Linearity Error

VREF = +2.5 VDC

±1

LSB (max)

Full Scale Error

VREF = +2.5 VDC

±1

LSB (max)

Zero Error

VREF = +2.5 VDC

±1

LSB (max)

Total Unadjusted Error

VREF = +5 VDC

(3)

±1

LSB (max)

Differential Linearity

VREF = +2.5 VDC

8

Bits (min)

3.5

k

Ω

RREF

Reference Input Resistance

See(4)

1.3

k

Ω (min)

6.0

k

Ω (max)

(VCC + 0.05)

V (max)

VIN

Analog Input Voltage

See(5)

(GND

− 0.05)

V (min)

DC Common-Mode Error

VREF = 2.5 VDC

±½

LSB (max)

VCC = +5V ±5%,

Power Supply Sensitivity

±¼

LSB (max)

VREF = +2.5 VDC

On Channel = 5V,

0.2

µA (max)

Off Channel = 0V

1

On Channel Leakage Current(6)

On Channel = 0V,

−0.2

µA (max)

Off Channel = 5V

−1

On Channel = 5V,

−0.2

µA (max)

Off Channel = 0V

−1

Off Channel Leakage Current(6)

On Channel = 0V,

0.2

µA (max)

Off Channel = 5V

1

DIGITAL AND DC CHARACTERISTICS

VIN(1)

Logical “1” Input Voltage

VCC = 5.25V

2.0

V (min)

VIN(0)

Logical “0” Input Voltage

VCC = 4.75V

0.8

V (max)

IIN(1)

Logical “1” Input Current

VIN = 5.0V

1

µA (max)

IIN(0)

Logical “0” Input Current

VIN = 0V

−1

µA (max)

VCC = 4.75V:

VOUT(1)

Logical “1” Output Voltage

IOUT = −360 µA

2.4

V (min)

IOUT = −10 µA

4.5

V (min)

VCC = 4.75V

0.4

V (max)

VOUT(0)

Logical “0” Output Voltage

IOUT = 1.6 mA

(1)

Typicals are at TJ = 25°C and represent the most likely parametric norm.

(2)

Ensured to AOQL (Average Outgoing Quality Level).

(3)

Total unadjusted error includes zero, full-scale, linearity, and multiplexer error. Total unadjusted error with VREF = +5V only applies to the

ADC08134 and ADC08138. See Note 7 on the following page.

(4)

Cannot be tested for the ADC08131.

(5)

For VIN(−) ≥ VIN(+) the digital code will be 0000 0000. Two on-chip diodes are tied to each analog input (see ADC08138 Simplified Block

Diagram) which will forward-conduct for analog input voltages one diode drop below ground or one diode drop greater than VCC supply.

During testing at low VCC levels (e.g., 4.5V), high level analog inputs (e.g., 5V) can cause an input diode to conduct, especially at

elevated temperatures. This will cause errors for analog inputs near full-scale. The specification allows 50 mV forward bias of either

diode; this means that as long as the analog VIN does not exceed the supply voltage by more than 50 mV, the output code will be

correct. Exceeding this range on an unselected channel will corrupt the reading of a selected channel. Achievement of an absolute 0

VDC to 5 VDC input voltage range will therefore require a minimum supply voltage of 4.950 VDC over temperature variations, initial

tolerance and loading.

(6)

Channel leakage current is measured after a single-ended channel is selected and the clock is turned off. For off channel leakage

current the following two cases are considered: one, with the selected channel tied high (5 VDC) and the remaining seven off channels

tied low (0 VDC), total current flow through the off channels is measured; two, with the selected channel tied low and the off channels

tied high, total current flow through the off channels is again measured. The two cases considered for determining on channel leakage

current are the same except total current flow through the selected channel is measured.

4

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