ADC10158CIWM datasheet(2/23 Pages) NSC

Part #	ADC10158CIWM

Description	10-Bit Plus Sign 4 關s ADCs with 4- or 8-Channel MUX, Track/Hold and Reference

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Manufacturer	NSC [National Semiconductor (TI)]

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Connection Diagrams

Pin Descriptions

AV

+

This is the positive analog supply. This pin

should be bypassed with a 0.1 µF ceramic ca-

pacitor and a 10 µF tantalum capacitor to the

system analog ground.

DV

+

This is the positive digital supply. This supply

pin also needs to be bypassed with 0.1 µF ce-

ramic and 10 µF tantalum capacitors to the

system digital ground. AV

+ and DV+ should be

bypassed separately and tied to same power

supply.

DGND

This is the digital ground. All logic levels are re-

ferred to this ground.

V

−

This is the negative analog supply. For unipolar

operation this pin may be tied to the system

analog ground or to a negative supply source.

It should not go above DGND by more than

50 mV. When bipolar operation is required, the

voltage on this pin will limit the analog input’s

negative voltage level. In bipolar operation this

supply pin needs to be bypassed with 0.1 µF

ceramic and 10 µF tantalum capacitors to the

system analog ground.

V

REF

+,

V

REF

−

These are the positive and negative reference

inputs. The voltage difference between V

REF

+

and V

REF

− will set the analog input voltage

span.

V

REFOut

This is the internal band-gap voltage reference

output. For proper operation of the voltage ref-

erence, this pin needs to be bypassed with a

330 µF tantalum or electrolytic capacitor.

CS

This is the chip select input. When a logic low

is applied to this pin the WR and RD pins are

enabled.

RD

This is the read control input. When a logic low

is applied to this pin the digital outputs are en-

abled and the INT output is reset high.

WR

This is the write control input. The rising edge

of the signal applied to this pin selects the mul-

tiplexer channel and initiates a conversion.

INT

This is the interrupt output. A logic low at this

output indicates the completion of a conver-

sion.

CLK

This is the clock input. The clock frequency di-

rectly controls the duration of the conversion

time (for example, in the 10-bit bipolar mode

t

C =

22/f

CLK) and the acquisition time (tA =

6/f

CLK).

DB0(MA0)

–DB7 (L/R)

These are the digital data inputs/outputs. DB0

is the least significant bit of the digital output

word; DB7 is the most significant bit in the digi-

tal output word (see the Output Data Configu-

ration table). MA0 through MA4 are the digital

inputs for the multiplexer channel selection

(see the Multiplexer Addressing tables). U/S

(Unsigned/Signed), 8/10, (8/10-bit resolution)

and L/R (Left/Right justification) are the digital

input bits that set the A/D’s output word format

and resolution (see the Output Data Configura-

tion table). The conversion time is modified by

the chosen resolution (see Electrical AC Char-

acteristics table). The lower the resolution, the

faster the conversion will be.

CH0–CH7

These are the analog input multiplexer chan-

nels. They can be configured as single-ended

inputs,

differential

input

pairs,

or

pseudo-differential inputs (see the Multiplexer

Addressing

tables

for

the

input

polarity

assignments).

Dual-in-Line and SO Packages

DS011225-2

Top View

Order Number ADC10154

NS Package Number M24B

Dual-in-Line and SO Packages

DS011225-3

Top View

Order Number ADC10158

NS Package Numbers

M28B or N28B

www.national.com

2

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