Datasheet

ADS8028
www.ti.com SBAS549B –MAY 2011–REVISED MARCH 2012
ELECTRICAL CHARACTERISTICS
Minimum and maximum specifications apply from T
A
= –40°C to +125°C. Typical specifications are at T
A
= +25°C.
All specifications at AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to 5.25 V, f
SAMPLE
= 1 MHz, f
SCLK
= 20 MHz, and V
REF
= 2.5 V
internal, unless otherwise noted.
ADS8028
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUTS
AINx Analog input voltage 0 V
REF
V
In sample mode 40 pF
Input capacitance
In hold mode 8 pF
Input bias current ±0.01 µA
SAMPLING DYNAMICS
SCLK = 20 MHz 660 700 ns
Conversion time
T
SENSE
temperature sensor channel 100 µs
Acquisition time Full-scale step input 100 ns
SCLK = 20 MHz, AINx channel 1 MSPS
Throughput rate
SCLK = 20 MHz, temperature
10 kSPS
measurement channel
Aperture delay 14 ns
At 3 dB 30 MHz
Full-power bandwidth
At 0.1 dB 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
f
A
= 40.1 kHz, f
B
= 41.5 kHz
IMD Intermodulation distortion Second-order terms –84 dB
Third-order terms –93 dB
Channel-to-channel isolation f
IN
= 50 kHz, f
NOISE
= 60 kHz –100 dB
INTERNAL REFERENCE OUTPUT
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 1 Ω
Internal reference temperature coefficient 12 35
(1)
ppm/°C
Internal reference noise 10-MHz bandwidth 60 µV
RMS
(1) Sample tested during initial release to ensure compliance.
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