Datasheet

ADC12130, ADC12132, ADC12138
www.ti.com SNAS098G –MARCH 2000–REVISED MARCH 2013
Converter Electrical Characteristics (continued)
The following specifications apply for (V
+
= V
A
+ = V
D
+ = +5V, V
REF
+ = +4.096V, and fully differential input with fixed 2.048V
common-mode voltage) or (V
+
= V
A
+ = V
D
+ = 3.3V, V
REF
+ = 2.5V and fully-differential input with fixed 1.250V common-mode
voltage), V
REF
− = 0V, 12-bit + sign conversion mode
(1)
, source impedance for analog inputs, V
REF
−
and V
REF
+
≤ 25Ω, f
CK
= f
SK
= 5 MHz, and 10 (t
CK
) acquisition time unless otherwise specified. Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
; all other
limits T
A
= T
J
= 25°C.
(2)(3)(4)
Units
Parameter Test Conditions Typical
(5)
Limits
(6)
(Limits)
DC Common Mode Error After Auto Cal
(10)
±2 LSB (max)
TUE Total Unadjusted Error After Auto Cal
(7)(11) (12)
±1 LSB
Multiplexer Chan-to-Chan Matching V
+
= +5V ±10%, V
REF
= +4.096V ±0.05 LSB
Power Supply Sensitivity
Offset Error ±0.5 LSB
+ Full-Scale Error ±0.5 LSB
− Full-Scale Error ±0.5 LSB
Integral Linearity Error ±0.5 LSB
UNIPOLAR DYNAMIC CONVERTER CHARACTERISTICS
f
IN
= 1 kHz, V
IN
= 5 V
PP
, V
REF
+
= 5.0V 69.4 dB
S/(N+D) Signal-to-Noise Plus Distortion Ratio f
IN
= 20 kHz, V
IN
= 5 V
PP
, V
REF
+
= 5.0V 68.3 dB
f
IN
= 40 kHz, V
IN
= 5 V
PP
, V
REF
+ = 5.0V 65.7 dB
−3 dB Full Power Bandwidth V
IN
= 5 V
PP
, where S/(N+D) drops 3 dB 31 kHz
DIFFERENTIAL DYNAMIC CONVERTER CHARACTERISTICS
f
IN
= 1 kHz, V
IN
= ±5V, V
REF
+
= 5.0V 77.0 dB
S/(N+D) Signal-to-Noise Plus Distortion Ratio f
IN
= 20 kHz, V
IN
= ±5V, V
REF
+
= 5.0V 73.9 dB
f
IN
= 40 kHz, V
IN
= ±5V, V
REF
+
= 5.0V 67.0 dB
−3 dB Full Power Bandwidth V
IN
= ±5V, where S/(N+D) drops 3 dB 40 kHz
REFERENCE INPUT, ANALOG INPUTS AND MULTIPLEXER CHARACTERISTICS
C
REF
Reference Input Capacitance 85 pF
A/DIN1 and A/DIN2 Analog Input
C
A/D
75 pF
Capacitance
A/DIN1 and A/DIN2 Analog Input
V
IN
= +5.0V or V
IN
= 0V ±0.1 μA
Leakage Current
GND − 0.05 V (min)
CH0–CH7 and COM Input Voltage
(V
A
+) + 0.05 V (max)
C
CH
CH0–CH7 and COM Input Capacitance 10 pF
C
MUXOUT
MUX Output Capacitance 20 pF
On Channel = 5V and
−0.01 μA
Off Channel = 0V
Off Channel Leakage
(13)
CH0–CH7 and COM Pins
On Channel = 0V and
0.01 μA
Off Channel = 5V
On Channel = 5V and
0.01 μA
Off Channel = 0V
On Channel Leakage
(13)
CH0–CH7 and COM Pins
On Channel = 0V and
−0.01 μA
Off Channel = 5V
MUXOUT1 and MUXOUT2 Leakage
V
MUXOUT
= 5.0V or V
MUXOUT
= 0V 0.01 μA
Current
V
IN
= 2.5V and
R
ON
MUX On Resistance 850 1900 Ω (max)
V
MUXOUT
= 2.4V
V
IN
= 2.5V and
R
ON
Matching Channel to Channel 5 %
V
MUXOUT
= 2.4V
(10) The DC common-mode error is measured in the differential multiplexer mode with the assigned positive and negative input channels
shorted together.
(11) Offset or Zero error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the average value
of the code transitions between −1 to 0 and 0 to +1 (see Figure 7).
(12) Total unadjusted error includes offset, full-scale, linearity and multiplexer errors.
(13) Channel leakage current is measured after the channel selection.
Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Links: ADC12130 ADC12132 ADC12138