Datasheet

ADC12030, ADC12032, ADC12034
ADC12038, ADC12H030, ADC12H032
ADC12H034, ADC12H038
www.ti.com SNAS080K –JULY 1999–REVISED MARCH 2013
Converter Electrical Characteristics (continued)
The following specifications apply for V
+
= V
A
+ = V
D
+ = +5.0 V
DC
, V
REF
+ = +4.096 V
DC
, V
REF
− = 0 V
DC
, 12-bit + sign
conversion mode, f
CK
= f
SK
= 8 MHz for the ADC12H030, ADC12H032, ADC12H034 and ADC12H038, f
CK
= f
SK
= 5 MHz for
the ADC12030, ADC12032, ADC12034 and ADC12038, R
S
= 25Ω, source impedance for V
REF
+ and V
REF
− ≤ 25Ω, fully-
differential input with fixed 2.048V common-mode voltage, 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.
(1)(2)(3)
Units
Parameter Test Conditions Typical
(4)
Limits
(5)
(Limits)
TUE Total Unadjusted Error After Auto Cal
(6)(10)(11)
±1 LSB
Resolution with No Missing Codes 8-bit + sign mode 8 + sign Bits (min)
INL Integral Linearity Error 8-bit + sign mode
(6)
±1/2 LSB (max)
DNL Differential Non-Linearity 8-bit + sign mode ±3/4 LSB (max)
Positive Full-Scale Error 8-bit + sign mode
(6)
±1/2 LSB (max)
Negative Full-Scale Error 8-bit + sign mode
(6)
±1/2 LSB (max)
8-bit + sign mode, after Auto Zero
Offset Error ±1/2 LSB (max)
V
IN
(+) = V
IN
(−) = + 2.048V
(10)
8-bit + sign mode after Auto Zero
TUE Total Unadjusted Error ±3/4 LSB (max)
(6)(10)(11)
Multiplexer Chan-to-Chan Matching ±0.05 LSB
Power Supply Sensitivity V
+
= +5V ±10%, V
REF
= +4.096V
Offset Error ±0.5 ±1 LSB (max)
+ Full-Scale Error ±0.5 ±1.5 LSB (max)
− Full-Scale Error ±0.5 ±1.5 LSB (max)
Integral Linearity Error ±0.5 LSB
Output Data from “12-Bit +10 LSB (max)
(see Table 5)
(12)
Conversion of Offset” −10 LSB (min)
Output Data from “12-Bit 4095 LSB (max)
(see Table 5)
(12)
Conversion of Full-Scale” 4093 LSB (min)
UNIPOLAR DYNAMIC CONVERTER CHARACTERISTICS
f
IN
= 1 kHz, V
IN
= 5 V
P-P
, V
REF
+
= 5.0V 69.4 dB
S/(N+D) Signal-to-Noise Plus Distortion Ratio f
IN
= 20 kHz, V
IN
= 5 V
P-P
, V
REF
+
= 5.0V 68.3 dB
f
IN
= 40 kHz, V
IN
= 5 V
P-P
, V
REF
+ = 5.0V 65.7 dB
−3 dB Full Power Bandwidth V
IN
= 5 V
P-P
, 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, A/DIN2 Analog Input
C
A/D
75 pF
Capacitance
A/DIN1, A/DIN2 Analog Input
V
IN
= +5.0V or V
IN
= 0V ±0.1 ±1.0 µA (max)
Leakage Current
GND − 0.05 V (min)
CH0–CH7 and COM Input Voltage
(V
A
+) + 0.05 V (max)
CH0–CH7 and COM Input
C
CH
10 pF
Capacitance
C
MUXOUT
MUX Output Capacitance 20 pF
(10) Offset error is a measure of the deviation from the mid-scale voltage (a code of zero), expressed in LSB. It is the worst-case value of the
code transitions between 1 to 0 and 0 to +1 (see Figure 8).
(11) Total unadjusted error includes offset, full-scale, linearity and multiplexer errors.
(12) The “12-Bit Conversion of Offset” and “12-Bit Conversion of Full-Scale” modes are intended to test the functionality of the device.
Therefore, the output data from these modes are not an indication of the accuracy of a conversion result.
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ADC12H038