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AGND

To Internal Circuitry

I/O

ADC12DC080

SNAS405B – SEPTEMBER 2007 – REVISED NOVEMBER 2008

www.ti.com

Converter Electrical Characteristics

Unless otherwise specified, the following specifications apply: AGND = DRGND = 0V, VA = +3.0V, VDR = +2.5V, Internal VREF

= +1.2V, fCLK = 80 MHz, VCM = VCMO, CL = 5 pF/pin. Typical values are for TA = 25°C. Boldface limits apply for TMIN ≤ TA ≤

TMAX. All other limits apply for TA = 25°C

(1) (2)

Typical

Units

Symbol

Parameter

Conditions

Limits

(3)

(Limits)

STATIC CONVERTER CHARACTERISTICS

Resolution with No Missing Codes

Bits (min)

1.2

LSB (max)

INL

Integral Non Linearity (4)

±0.5

-1.2

LSB (min)

0.5

LSB (max)

DNL

Differential Non Linearity

±0.2

-0.5

LSB (min)

PGE

Positive Gain Error

-0.1

±1

%FS (max)

NGE

Negative Gain Error

0.1

±1

%FS (max)

TC PGE

Positive Gain Error Tempco

−40°C ≤ TA ≤ +85°C

-3

ppm/°C

TC NGE

Negative Gain Error Tempco

−40°C ≤ TA ≤ +85°C

-7

ppm/°C

VOFF

Offset Error

-.02

±0.55

%FS (max)

TC VOFF

Offset Error Tempco

−40°C ≤ TA ≤ +85°C

-4

ppm/°C

Under Range Output Code

Over Range Output Code

4095

REFERENCE AND ANALOG INPUT CHARACTERISTICS

1.45

V (min)

VCMO

Common Mode Output Voltage

1.5

1.56

V (max)

1.4

V (min)

VCM

Analog Input Common Mode Voltage

1.5

1.6

V (max)

(CLK LOW)

8.5

VIN Input Capacitance (each pin to GND) VIN = 1.5 Vdc ± 0.5

CIN

(5)

(CLK HIGH)

3.5

1.176

V (min)

VREF

Internal Reference Voltage

1.20

1.224

V (max)

TC VREF

Internal Reference Voltage Tempco

−40°C ≤ TA ≤ +85°C

ppm/°C

VRP

Internal Reference Top(6)

VRN

Internal Reference Bottom(6)

0.89

V (Min)

Internal Reference Accuracy

(VRP-VRN)

1.06

V (max)

EXT

1.176

V (Min)

External Reference Voltage(6)

1.2

VREF

1.224

V (max)

(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 Note 4 under Absolute Maximum Ratings. However, errors in the A/D conversion can occur if the input goes above

2.6V or below GND as described in the Operating Ratings section.

(2)

With a full scale differential input of 2VP-P , the 12-bit LSB is 488 µV.

(3)

Typical figures are at TA = 25°C and represent most likely parametric norms at the time of product characterization. The typical

specifications are not ensured.

(4)

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.

(5)

The input capacitance is the sum of the package/pin capacitance and the sample and hold circuit capacitance.

(6)

This parameter is specified by design and/or characterization and is not tested in production.

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