Datasheet

V
A
AGND
To Internal Circuitry
I/O
ADC12C105
SNAS417B –MAY 2007–REVISED AUGUST 2007 www.ti.com
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, 50% Duty Cycle, DCS disabled, 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)
Typical Units
Symbol Parameter Conditions Limits
(3)
(Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes 12 Bits (min)
1.2 LSB (max)
INL Integral Non Linearity ±0.5
-1.2 LSB (min)
0.7 LSB (max)
DNL Differential Non Linearity ±0.35
-0.6 LSB (min)
PGE Positive Gain Error -0.35 ±1.25 %FS (max)
NGE Negative Gain Error -0.2 ±1.25 %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 (V
IN
+ = V
IN
-) 0.065 ±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
REFERENCE AND ANALOG INPUT CHARACTERISTICS
1.4 V (min)
V
CMO
Common Mode Output Voltage 1.5
1.56 V (max)
1.4 V (min)
V
CM
Analog Input Common Mode Voltage 1.5
1.6 V (max)
(CLK LOW) 8.5 pF
V
IN
Input Capacitance (each pin to GND) V
IN
= 1.5 Vdc ± 0.5
C
IN
(4)
V
(CLK HIGH) 3.5 pF
V
REF
Internal Reference Voltage 1.18 V
TC V
REF
Internal Reference Voltage Tempco −40°C ≤ T
A
≤ +85°C 18 ppm/°C
1.89 V (min)
V
RP
Internal Reference top 1.98
2.06 V (max)
0.89 V (min)
V
RN
Internal Reference bottom 0.98
1.06 V (max)
1.176 V (min)
Ext V
REF
External Reference Voltage 1.20
1.224 V (max)
(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 per Absolute Maximum Ratings, Note 4. 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) 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 ensured.
(4) The input capacitance is the sum of the package/pin capacitance and the sample and hold circuit capacitance.
6 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated
Product Folder Links: ADC12C105