ADC12DL080 datasheet(7/35 Pages) TI1

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AGND

To Internal Circuitry

I/O

conversions.

ADC12DL080

www.ti.com

SNAS345 – FEBRUARY 2006

Converter Electrical Characteristics

Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VA = VD = +3.3V, VDR =

+2.5V, PD = 0V, External VREF = +1.0V, fCLK = 80 MHz, fIN = 40 MHz, CL = 10 pF/pin, Duty Cycle Stabilizer On. Boldface

limits apply for TJ = TMIN to TMAX: all other limits TJ = 25°C

(1) (2) (3)

Typical

Limits

Units

Symbol

Parameter

Conditions

(4)

(Limits)

STATIC CONVERTER CHARACTERISTICS

Resolution with No Missing Codes

Bits (min)

INL

Integral Non Linearity (5)

fIN = 0, Best Fit Method

±0.9

±3.5

LSB (max)

DNL

Differential Non Linearity

fIN = 0

±0.4

±1.0

LSB (max)

PGE

Positive Gain Error

±0.3

±3.5

%FS (max)

NGE

Negative Gain Error

±0.3

±3.5

%FS (max)

TC GE

Gain Error Tempco

−40°C ≤ TA ≤ +85°C

ppm/°C

+0.75

%FS (max)

VOFF

Offset Error (VIN+ = VIN−)

-0.2

-1.1

%FS (min)

TC VOFF

Offset Error Tempco

−40°C ≤ TA ≤ +85°C

ppm/°C

Under Range Output Code

Over Range Output Code

4095

REFERENCE AND ANALOG INPUT CHARACTERISTICS

1.0

V (min)

VCM

Common Mode Input Voltage

1.5

2.0

V (max)

VRMA,

Reference Output Voltage

1.5

VRMB

(CLK LOW)

CIN

VIN Input Capacitance (each pin to GND)

VIN = 1.5 Vdc ±0.5V

(CLK HIGH)

0.8

V (min)

VREF

External Reference Voltage (6)

1.00

1.2

V (max)

Reference Input Resistance

Ω (min)

DYNAMIC CONVERTER CHARACTERISTICS

(1)

The inputs are protected as shown below. Input voltage magnitudes above VA or below GND will not damage this device, provided

current is limited per (). However, errors in the A/D conversion can occur if the input goes above VA or below GND by more than 100

mV. As an example, if VA is +3.3V, the full-scale input voltage must be ≤+3.4V to ensure accurate

(2)

To guarantee accuracy, it is required that |VA–VD| ≤ 100 mV and separate bypass capacitors are used at each power supply pin.

(3)

With the test condition for VREF = +1.0V (2VP-P differential input), the 12-bit LSB is 488 µV.

(4)

Typical figures are at TJ = 25°C, and represent most likely parametric norms. Test limits are guaranteed to National's AOQL (Average

Outgoing Quality Level).

(5)

Integral Non Linearity is defined as the deviation of the analog value, expressed in LSBs, from the straight line that passes through

positive and negative full-scale.

(6)

Optimum performance will be obtained by keeping the reference input in the 0.8V to 1.2V range. The LM4051CIM3-ADJ (SOT-23

package) is recommended for external reference applications.

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