ADS8881 Datasheet, PDF (4/44 Pages) Texas Instruments – 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter

ADS8881
SBAS547A – MAY 2013 – REVISED JULY 2013
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ELECTRICAL CHARACTERISTICS (continued)
All minimum and maximum specifications are at T_A = –40°C to +85°C, AVDD = 3 V, DVDD = 3 V, V_REF = 5 V, V_CM = V_REF /
2 V, and f_SAMPLE = 1 MSPS, unless otherwise noted. Typical specifications are at T_A = +25°C, AVDD = 3 V, and DVDD = 3 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
DYNAMIC CHARACTERISTICS
SINAD Signal-to-noise + distortion⁽⁶⁾
SNR Signal-to-noise ratio⁽⁶⁾
THD Total harmonic distortion⁽⁶⁾⁽⁷⁾
SFDR Spurious-free dynamic range⁽⁶⁾
BW_-3dB –3-dB small-signal bandwidth
EXTERNAL REFERENCE INPUT
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
98
99.9
98.7
93.3
98.5
100
99.5
93.5
–115
–112
–102
115
112
102
30
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
V_REF
Input range
Reference input current
During conversion, 1-MHz sample rate, mid-code
2.5
350
5
V
μA
C_REF
Decoupling capacitor at the REF
input
10
22
µF
POWER-SUPPLY REQUIREMENTS
Power-supply
voltage
AVDD
DVDD
Analog supply
Digital supply range
Digital supply range for specified performance
2.7
3
1.65
3
2.7
3
3.6
V
3.6
V
3.6
V
Supply current
AVDD
1-MHz sample rate, AVDD = 3 V
1.8
2.4 mA
1-MHz sample rate, AVDD = 3 V
5.5
7.2 mW
P_VA
Power dissipation
100-kHz sample rate, AVDD = 3 V
10-kHz sample rate, AVDD = 3 V
0.55
mW
55
μW
IA_PD
Device power-down current⁽⁸⁾
LOGIC FAMILY (CMOS)
50
nA
V_IH
Logic level (digital inputs)
V_IL
V_OH
Logic level (digital outputs)
V_OL
TEMPERATURE RANGE
I_O = 500-μA source, C_LOAD = 20 pF
I_O = 500-μA sink, C_LOAD = 20 pF
0.7 × DVDD
–0.3
0.8 × DVDD
0
DVDD + 0.3
V
0.3 × DVDD
V
DVDD
V
0.2 × DVDD
V
T_A
Operating free-air temperature
–40
+85
°C
(6) All specifications expressed in decibels (dB) refer to the full-scale input (FSR) and are tested with an input signal 0.5 dB below full-scale,
unless otherwise specified.
(7) Calculated on the first nine harmonics of the input frequency.
(8) The device automatically enters a power-down state at the end of every conversion, and remains in power-down during the acquisition
phase.
4
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