ADS8881C Datasheet, PDF (8/57 Pages) Texas Instruments – ADS8881x 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter

ADS8881C, ADS8881I
SBAS547C – MAY 2013 – REVISED JULY 2014
www.ti.com
Electrical Characteristics (continued)
All minimum and maximum specifications are at AVDD = 3 V, DVDD = 3 V, V_REF = 5 V, V_CM = V_REF / 2 V,
and f_SAMPLE = 1 MSPS, over the operating free-air temperature range, unless otherwise noted.
Typical specifications are at T_A = 25°C, AVDD = 3 V, and DVDD = 3 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
DYNAMIC CHARACTERISTICS
SINAD
At 1 kHz, V_REF = 5 V
Signal-to-noise + distortion⁽⁶⁾ At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
SNR
Signal-to-noise ratio⁽⁶⁾
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
THD
At 1 kHz, V_REF = 5 V
Total harmonic distortion⁽⁶⁾⁽⁷⁾ At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
SFDR
Spurious-free dynamic
range ⁽⁶⁾
At 1 kHz, V_REF = 5 V
At 10 kHz, V_REF = 5 V
At 100 kHz, V_REF = 5 V
BW_–3dB –3-dB small-signal bandwidth
POWER-SUPPLY REQUIREMENTS
98
99.9
98.7
93.3
98.5
100
99.5
93.5
–115
–112
–102
115
112
102
30
Power-supply
voltage
AVDD
DVDD
Analog supply
Digital supply range for SCLK > 40 MHz
Digital supply range for SCLK < 40 MHz
2.7
3
3.6
2.7
3
3.6
1.65
1.8
3.6
Supply current AVDD 1-MHz sample rate, AVDD = 3 V
1.8
2.4
1-MHz sample rate, AVDD = 3 V
5.5
7.2
P_VA
Power dissipation
100-kHz sample rate, AVDD = 3 V
0.55
10-kHz sample rate, AVDD = 3 V
55
IA_PD
Device power-down
current ⁽⁸⁾
50
DIGITAL INPUTS: LOGIC FAMILY (CMOS)
1.65 V < DVDD < 2.3 V
V_IH
High-level input voltage
2.3 V < DVDD < 3.6 V
0.8 × DVDD
0.7 × DVDD
DVDD + 0.3
DVDD + 0.3
1.65 V < DVDD < 2.3 V
V_IL
Low-level input voltage
2.3 V < DVDD < 3.6 V
–0.3
0.2 × DVDD
–0.3
0.3 × DVDD
I_LK
Digital input leakage current
DIGITAL OUTPUTS: LOGIC FAMILY (CMOS)
±10
±100
V_OH
High-level output voltage
V_OL
Low-level output voltage
TEMPERATURE RANGE
I_O = 500-μA source, C_LOAD = 20 pF
I_O = 500-μA sink, C_LOAD = 20 pF
0.8 × DVDD
0
DVDD
0.2 × DVDD
T_A
Operating free-air
temperature
ADS8881C
ADS8881I
0
70
–40
85
UNIT
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
V
V
V
mA
mW
mW
μW
nA
V
V
V
V
nA
V
V
°C
°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.
8
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