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ADS8028_14 Datasheet, PDF (3/35 Pages) Texas Instruments – 12-Bit, 1-MSPS, 8-Channel, SAR ADC with Internal Reference and Internal Temperature Sensor
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ADS8028
www.ti.com
SBAS549B – MAY 2011 – REVISED MARCH 2012
ELECTRICAL CHARACTERISTICS
Minimum and maximum specifications apply from TA = –40°C to +125°C. Typical specifications are at TA = +25°C.
All specifications at AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to 5.25 V, fSAMPLE = 1 MHz, fSCLK = 20 MHz, and VREF = 2.5 V
internal, unless otherwise noted.
ADS8028
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
ANALOG INPUTS
AINx
Analog input voltage
Input capacitance
In sample mode
In hold mode
0
VREF
V
40
pF
8
pF
Input bias current
±0.01
µA
SAMPLING DYNAMICS
Conversion time
Acquisition time
SCLK = 20 MHz
TSENSE temperature sensor channel
Full-scale step input
660
700
ns
100
µs
100
ns
Throughput rate
SCLK = 20 MHz, AINx channel
SCLK = 20 MHz, temperature
measurement channel
1 MSPS
10 kSPS
Aperture delay
14
ns
Full-power bandwidth
At 3 dB
At 0.1 dB
30
MHz
10
MHz
Step response
100
ns
Overload recovery
100
ns
DC ACCURACY
Resolution
12
Bits
No missing codes
12
Bits
INL
Integral nonlinearity
±0.5
±1
LSB
DNL
Differential nonlinearity
±0.5
±0.99
LSB
Offset error
±2
±4.5
LSB
Offset error matching
±2.5
±4.5
LSB
Offset temperature drift
4
ppm/°C
Gain error
±1
±4
LSB
Gain error matching
±1
±2.5
LSB
Gain temperature drift
0.5
ppm/°C
DYNAMIC PERFORMANCE
SNR
Signal-to-noise ratio
50-kHz input, –0.5 dBFS
70
72
dB
SINAD Signal-to-noise and distortion ratio
50-kHz input, –0.5 dBFS
70
71
dB
THD
Total harmonic distortion
50-kHz input, –0.5 dBFS
–82
–77
dB
SFDR Spurious-free dynamic range
50-kHz input, –0.5 dBFS
77.5
84
dB
IMD
Intermodulation distortion
fA = 40.1 kHz, fB = 41.5 kHz
Second-order terms
–84
dB
Third-order terms
–93
dB
Channel-to-channel isolation
INTERNAL REFERENCE OUTPUT
fIN = 50 kHz, fNOISE = 60 kHz
–100
dB
Reference output voltage
±0.3% maximum at +25°C
2.4925
2.5
2.5075
V
Long-term stability
150
ppm
Output voltage hysteresis
50
ppm
Internal reference output impedance
Internal reference temperature coefficient
1
Ω
12
35(1) ppm/°C
Internal reference noise
10-MHz bandwidth
60
µVRMS
(1) Sample tested during initial release to ensure compliance.
Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Link(s): ADS8028
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