ADC12L032 datasheet(6/35 Pages) NSC

Part #	ADC12L032

Description	3.3V Self-Calibrating 12-Bit Plus Sign Serial I/O A/D Converters with MUX and Sample/Hold

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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DC and Logic Electrical Characteristics

The following specifications apply for V

+ =V

A+=VD+ = +3.3 VDC,VREF+ = +2.500 VDC,VREF−=0VDC, 12-bit + sign conver-

sion mode, f

CK =fSK = 5 MHz, RS =25

Ω, source impedance for V

REF+ and VREF−

≤ 25Ω, fully-differential input with fixed

1.250V common-mode voltage, and 10(t

CK) acquisition time unless otherwise specified. Boldface limits apply for TA =TJ =

T

MIN to TMAX; all other limits TA =TJ = 25˚C. (Notes 7, 8, 9)

Symbol

Parameter

Conditions

Typical

(Note 10)

Limits

(Note 11)

Units

(Limits)

CCLK, CS, CONV, DI, PD AND SCLK INPUT CHARACTERISTICS

V

IN(1)

Logical “1” Input Voltage

V

+ = 3.6V

2.0

V (min)

V

IN(0)

Logical “0” Input Voltage

V

+ = 3.0V

0.8

V (max)

I

IN(1)

Logical “1” Input Current

V

IN = 3.3V

0.005

1.0

µA (max)

I

IN(0)

Logical “0” Input Current

V

IN = 0V

−0.005

−1.0

µA (min)

DO, EOC AND DOR DIGITAL OUTPUT CHARACTERISTICS

V

OUT(1)

Logical “1” Output Voltage

V

+ = 3.0V, I

OUT = −360 µA

2.4

V (min)

V

+ = 3.0V, I

OUT =−10µA

2.9

V (min)

V

OUT(0)

Logical “0” Output Voltage

V

+ = 3.0V, I

OUT = 1.6 mA

0.4

V (max)

I

OUT

TRI-STATE Output Current

V

OUT = 0V

−0.1

−3.0

µA (max)

V

OUT = 3.3V

0.1

3.0

µA (max)

+I

SC

Output Short Circuit Source Current

V

OUT =0V

14

6.5

mA (min)

−I

SC

Output Short Circuit Sink Current

V

OUT =VD+16

8.0

mA (min)

POWER SUPPLY CHARACTERISTICS

I

D+

Digital Supply Current

Awake

1.1

1.5

mA (max)

CS = HIGH, Powered Down, CCLK on

600

µA

CS = HIGH, Powered Down, CCLK off

12

µA

I

A+

Positive Analog Supply Current

Awake

2.2

3.0

mA (max)

CS = HIGH, Powered Down, CCLK on

10

µA

CS = HIGH, Powered Down, CCLK off

0.1

µA

I

REF

Reference Input Current

Awake

70

µA

CS = HIGH, Powered Down

0.1

µA

AC Electrical Characteristics

The following specifications apply for V

+ =V

A+=VD+ = +3.3 VDC,VREF+ = +2.500 VDC,VREF−=0VDC, 12-bit + sign conver-

sion mode, t

r =tf = 3 ns, fCK =fSK = 5 MHz, RS =25

Ω, source impedance for V

REF+ and VREF−

≤ 25Ω, fully-differential input

with fixed 1.250V common-mode voltage, and 10(t

CK) acquisition time unless otherwise specified. Boldface limits apply for

T

A =TJ =TMIN to TMAX; all other limits TA =TJ = 25˚C. (Note 17)

Symbol

Parameter

Conditions

Typical

(Note 10)

Limits (Note 11)

Units (Limits)

f

CK

Conversion Clock (CCLK) Frequency

10

5

MHz (max)

1

MHz (min)

f

SK

Serial Data Clock SCLK Frequency

10

5

MHz (max)

0

Hz (min)

Conversion Clock Duty Cycle

40

% (min)

60

% (max)

Serial Data Clock Duty Cycle

40

% (min)

60

% (max)

t

C

Conversion Time

12-Bit + Sign or 12-Bit

44(t

CK)

44(t

CK)

(max)

8.8

µs (max)

8-Bit + Sign or 8-Bit

21(t

CK)

21(t

CK)

(max)

4.2

µs (max)

www.national.com

6

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ADC12L032 Datasheet(PDF) 6 Page - National Semiconductor (TI)

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