Datasheet

ADS8634
ADS8638
SBAS541A –MAY 2011– REVISED AUGUST 2011 www.ti.com
ELECTRICAL CHARACTERISTICS: ADS8634, ADS8638 (continued)
Minimum/maximum specifications at T
A
= –40°C to +125°C, f
SAMPLE
= 1MSPS, HVDD = 10V to 15V, HVSS = –10V to –15V,
AVDD = 4.75V to 5.25V, DVDD = 2.7V to 3.6V, and V
REF
= 2.5V, unless otherwise noted. Typical specifications at +25°C,
f
SAMPLE
= 1MHz, HVDD = 10V, HVSS = –10V, AVDD = 3.3V, DVDD = 3.3V, and V
REF
= 2.5V, unless otherwise noted.
ADS8634, ADS8638
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DYNAMIC CHARACTERISTICS
At 1kHz –81 dB
Total harmonic distortion
(6)
(THD)
At 100kHz –80 dB
At 1kHz 71 71.8 dB
Signal-to-noise ratio (SNR)
At 100kHz 71.1 dB
At 1kHz 70.1 71.3 dB
Signal-to-noise and distortion ratio
(SINAD)
At 100kHz 70.5 dB
At 1kHz –83 dB
Spurious-free dynamic range (SFDR)
At 100kHz –80 dB
Full-power bandwidth At –3dB 1 MHz
DIGITAL INPUT/OUTPUT
Logic family CMOS V
V
IH
0.7 DVDD V
V
IL
0.3 DVDD V
Logic level
V
OH
With 20pF load on SDO 0.8 DVDD V
V
OL
With 20pF load on SDO 0.2 DVDD V
EXTERNAL VOLTAGE REFERENCE
3.0 or
Reference input AVDD,
V
REF
2.0 V
voltage range whichever
is less
INTERNAL VOLTAGE REFERENCE
Reference output voltage 2.5 V
Initial accuracy –1.2 1.2 %
Temperature drift 20 ppm/°C
Drive current, source
(7)
750 µA
Drive current, sink 20 µA
Driver output impedance 1 Ω
Turn-on settling time With 10µF decoupling capacitor from REF to REFGND 9 ms
INTERNAL TEMPERATURE SENSOR
Absolute accuracy 5 % of FSR
(6) Calculated on the first nine harmonics of the input frequency.
(7) Internal reference output is short-circuit protected. In case of short-circuit to ground, the drive current is limited to this value.
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Product Folder Link(s): ADS8634 ADS8638