Datasheet

V
A
AGND
To Internal Circuitry
I/O
ADC12DC105
www.ti.com SNAS469A –SEPTEMBER 2008–REVISED OCTOBER 2008
Dynamic Converter Electrical Characteristics (continued)
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)
Units
Parameter Test Conditions Typical
(3)
Limits
(Limits)
(4)
f
IN
= 10 MHz −86 dBFS
f
IN
= 70 MHz −85 dBFS
THD Total Harmonic Disortion
f
IN
= 170 MHz −84 -76.5 dBFS
f
IN
= 240 MHz -80 dBFS
f
IN
= 10 MHz −95 dBFS
f
IN
= 70 MHz −90 dBFS
H2 Second Harmonic Distortion
f
IN
= 170 MHz −83 -78 dBFS
f
IN
= 240 MHz -84 dBFS
f
IN
= 10 MHz −90 dBFS
f
IN
= 70 MHz −86 dBFS
H3 Third Harmonic Distortion
f
IN
= 170 MHz −83 -78 dBFS
f
IN
= 240 MHz -81 dBFS
f
IN
= 10 MHz 70.9 dBFS
f
IN
= 70 MHz 70.3 dBFS
SINAD Signal-to-Noise and Distortion Ratio
f
IN
= 170 MHz 69 67.4 dBFS
f
IN
= 240 MHz 68.2 dBFS
IMD Intermodulation Distortion f
IN
= 20 MHz and 21 MHz, each -7dBFS -84 dBFS
0 MHz tested channel, f
IN
= 10 MHz at -
Crosstalk -100 dBFS
1dBFS other channel
Logic and Power Supply 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)
DIGITAL INPUT CHARACTERISTICS (CLK, PD_A,PD_B)
V
IN(1)
Logical “1” Input Voltage V
D
= 3.3V 2.0 V (min)
V
IN(0)
Logical “0” Input Voltage V
D
= 3.0V 0.8 V (max)
I
IN(1)
Logical “1” Input Current V
IN
= 3.3V 10 µA
I
IN(0)
Logical “0” Input Current V
IN
= 0V −10 µA
C
IN
Digital Input Capacitance 5 pF
(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.
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