VA

AGND

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I/O

ADC12DL040

www.ti.com

SNAS250D – FEBRUARY 2005 – REVISED APRIL 2013

Converter Electrical Characteristics

Unless otherwise specified, the following specifications apply for AGND = DGND = DR GND = 0V, VA = VD = +3.0V, VDR =

+2.5V, PD = 0V, External VREF = +1.0V, fCLK = 40 MHz, fIN = 10 MHz, tr = tf = 2 ns, CL = 15 pF/pin, Duty Cycle Stabilizer On,

parallel output mode. Boldface limits apply for TJ = TMIN to TMAX: all other limits TJ = 25°C

(1) (2) (3)

Typical

Limits

Units

Symbol

Parameter

Conditions

(4)

(4)

(Limits)

STATIC CONVERTER CHARACTERISTICS

Resolution with No Missing Codes

12

Bits (min)

INL

Integral Non Linearity (5)

±0.8

± 2.6

LSB (max)

DNL

Differential Non Linearity

±0.3

+0.96, -0.9

LSB (max)

PGE

Positive Gain Error

±0.2

+2.5, -3.3

%FS (max)

NGE

Negative Gain Error

±0.2

±3.6

%FS (max)

TC GE

Gain Error Tempco

−40°C ≤ TA ≤ +85°C

5

ppm/°C

VOFF

Offset Error (VIN+ = VIN−)

0.1

±0.8

%FS (max)

TC VOFF

Offset Error Tempco

−40°C ≤ TA ≤ +85°C

3

ppm/°C

Under Range Output Code

0

0

Over Range Output Code

4095

4095

REFERENCE AND ANALOG INPUT CHARACTERISTICS

0.5

V (min)

VCM

Common Mode Input Voltage

1.5

2.0

V (max)

VRMA,

Reference Output Voltage

Output load = 1 mA

1.5

V

VRMB

(CLK LOW)

8

pF

CIN

VIN Input Capacitance (each pin to GND)

VIN = 2.5 Vdc + 0.7 Vrms

(CLK HIGH)

7

pF

0.8

V (min)

VREF

External Reference Voltage (6)

1.00

1.2

V (max)

Reference Input Resistance

1

M

Ω (min)

DYNAMIC CONVERTER CHARACTERISTICS

FPBW

Full Power Bandwidth

0 dBFS Input, Output at

−3 dB

250

MHz

fIN = 1 MHz, VIN = −0.5 dBFS

69

dB

SNR

Signal-to-Noise Ratio

fIN = 10 MHz, VIN = −0.5 dBFS

69

67.5

dB (min)

fIN = 20 MHz, VIN = −0.5 dBFS

68.5

66.5

dB

(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

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

conversions.

(2)

To specify 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 specified to TI'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.

Copyright © 2005–2013, Texas Instruments Incorporated

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