Datasheet

V
A
AGND
To Internal Circuitry
I/O
ADC12DC105
www.ti.com SNAS469A –SEPTEMBER 2008–REVISED OCTOBER 2008
Operating Ratings
(1)(2)
Operating Temperature −40°C ≤ T
A
≤ +85°C
Supply Voltage (V
A
) +2.7V to +3.6V
Output Driver Supply (V
DR
) +2.4V to V
A
(DCS Enabled) 30/70 %
Clock Duty Cycle
(DCS Disabled) 45/55 %
V
CM
1.4V to 1.6V
|AGND-DRGND| ≤100mV
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is guaranteed to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test
conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance
characteristics may degrade when the device is not operated under the listed test conditions. Operation of the device beyond the
maximum Operating Ratings is not recommended.
(2) All voltages are measured with respect to GND = AGND = DRGND = 0V, unless otherwise specified.
Converter Electrical Characteristics
Unless otherwise specified, the following specifications apply: AGND = DRGND = 0V, V
A
= +3.3V, V
DR
= +2.5V, Internal V
REF
= +1.2V, f
CLK
= 105 MHz, V
CM
= V
CMO
, C
L
= 5 pF/pin. Typical values are for T
A
= 25°C. Boldface limits apply for T
MIN
≤ T
A
≤
T
MAX
. All other limits apply for T
A
= 25°C
(1)(2)(3)
Units
Parameter Test Conditions Typical
(4)
Limits
(Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes 12 Bits (min)
1.1 LSB (max)
INL Integral Non Linearity
(5)
±0.5
-1.1 LSB (min)
0.55 LSB (max)
DNL Differential Non Linearity ±0.2
-0.55 LSB (min)
PGE Positive Gain Error -0.1 ±1 %FS (max)
NGE Negative Gain Error 0.18 ±1 %FS (max)
TC PGE Positive Gain Error Tempco −40°C ≤ T
A
≤ +85°C -3 ppm/°C
TC NGE Negative Gain Error Tempco −40°C ≤ T
A
≤ +85°C -7 ppm/°C
V
OFF
Offset Error 0.01 ±0.55 %FS (max)
TC V
OFF
Offset Error Tempco −40°C ≤ T
A
≤ +85°C -4 ppm/°C
Under Range Output Code 0 0
Over Range Output Code 4095 4095
(1) The inputs are protected as shown below. Input voltage magnitudes above V
A
or below GND will not damage this device, provided
current is limited. 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 2V
P-P
, the 12-bit LSB is 488 µV.
(3) When the input voltage at any pin exceeds the power supplies (that is, V
IN
< AGND, or V
IN
> V
A
), the current at that pin should be
limited to ±5 mA. The ±50 mA maximum package input current rating limits the number of pins that can safely exceed the power
supplies with an input current of ±5 mA to 10.
(4) Typical figures are at T
A
= 25°C and represent most likely parametric norms at the time of product characterization. The typical
specifications are not guaranteed.
(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.
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