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ADS774H Datasheet, PDF (3/23 Pages) Texas Instruments – Microprocessor-Compatible Sampling CMOS ANALOG-TO-DIGITAL CONVERTER
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ADS774H
www.ti.com ................................................................................................................................................................................................ SBAS443 – AUGUST 2009
ELECTRICAL CHARACTERISTICS
All specifications at TA = TMIN to TMAX, VDD = +5V, VEE = –15V to +5V, sampling frequency of 117kHz, and fIN = 10kHz, unless otherwise
noted.
PARAMETER
SYSTEM PERFORMANCE
Resolution
ANALOG INPUTS
CONDITIONS
Voltage range
Unipolar
Bipolar
Impedance
0V to +10V, ±5V
±10V, 0V to +20V
DIGITAL INPUTS (CE, CS, R/C, A0, 12/8)
Voltages
Logic 1
Logic 0
Current
Capacitance
DC ACCURACY
Linearity error
Unipolar offset error
Unipolar offset
Bipolar offset error
At +25°C
TMIN to TMAX (2)
At +25°C (adjustable to zero)
TMIN to TMAX (2)
At +25°C (adjustable to zero)
Bipolar offset
Full-scale calibration error(3)
No missing codes resolution
AC ACCURACY(5)
TMIN to TMAX (2)
At +25°C (adjustable to zero)
TMIN to TMAX (2)
At +25°C
TMIN to TMAX (2)
Spurious free dynamic range
Total harmonic distortion
Signal-to-noise ratio
Signal-to-(noise + distortion) ratio
Intermodulation distortion
fIN1 = 20kHz, fIN2 = 23kHz
TEMPERATURE COEFFICIENTS(6)
Unipolar offset
Bipolar offset
Full-scale calibration
POWER-SUPPLY SENSITIVITY
Change in full-scale calibration(7) +4.75V < VDD < +5.25V
CONVERSION TIME (Including Acquisition Time)
tAQ + tC at +25°C
8-bit cycle
12-bit cycle
12-bit cycle, TMIN to TMAX
ADS774HI
MIN
TYP
0 to +10,
0 to +20
±5, ±10
8.5
12
35
50
+2.0
–0.5
–5
0.1
5
12
12
73
78
–77
69
72
68
71
–75
±1
±2
±12
5.5
7.5
8
MAX
12
+5.5
+0.8
+5
±1
±1
±2
±4
±10
±12
±0.25
±0.47
–72
±1/2
5.9
8
8.5
ADS774HIB (1)
MIN
TYP
MAX UNIT
12 Bits
0 to +10,
0 to +20
V
±5, ±10
V
8.5
12
kΩ
35
50
kΩ
+2.0
+5.5
V
–0.5
+0.8
V
–5
0.1
+5
µA
5
pF
±1/2 LSB
±1/2 LSB
±2 LSB
±3 LSB
±4 LSB
±5 LSB
±0.25 % of FS(4)
±0.37 % of FS
12
Bits
12
Bits
76
78
dB
–77
–75
dB
71
72
dB
70
71
dB
–75
dB
±1
ppm/°C
±2
ppm/°C
±12
ppm/°C
±1/2 LSB
5.5
5.9
µs
7.5
8
µs
8
8.5
µs
(1) Shaded cells indicate different specifications from standard grade version of device.
(2) Maximum error at TMIN and TMAX.
(3) With fixed 50Ω resistor from REF OUT to REF IN. This parameter is also adjustable to zero at +25°C.
(4) FS in this parametric table means Full-Scale Range. That is, for a ±10V input range, FS = 20V; for a 0V to +10V range, FS = 10V.
(5) Based on VEE = +5V, which is the Control Mode; see the S/H Control Mode and ADC774 Emulation Mode section.
(6) Using internal reference.
(7) This parameter is the worst-case change in accuracy from accuracy with a +5V supply.
Copyright © 2009, Texas Instruments Incorporated
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