Datasheet

®
ADS774 2
SPECIFICATIONS
ELECTRICAL
At T
A
= T
MIN
to T
MAX
, V
DD
= +5V, V
EE
= –15V to +5V, sampling frequency of 117kHz, f
IN
= 10kHz; unless otherwise specified.
ADS774JE, JP, JU ADS774KE, KP, KU
PARAMETER MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits
INPUTS
ANALOG
Voltage Ranges: Unipolar 0 to +10, 0 to +20 V
Bipolar ±5, ±10 V
Impedance: 0 to +10V, ±5V 8.5 12 ✻✻ kΩ
±10V, 0V to +20V 35 50 ✻✻ kΩ
DIGITAL (CE, CS, R/C, A
O
, 12/8)
Voltages: Logic 1 +2.0 +5.5 ✻✻V
Logic 0 –0.5 +0.8 ✻✻V
Current –5 0.1 +5 ✻✻✻µA
Capacitance 5 ✻ pF
TRANSFER CHARACTERISTICS
DC ACCURACY
At +25°C
Linearity Error ±1 ±1/2 LSB
Unipolar Offset Error (adjustable to zero) ±2 ✻ LSB
Bipolar Offset Error (adjustable to zero) ±10 ±4 LSB
Full-Scale Calibration Error
(1)
±0.25 ✻ % of FS
(2)
(adjustable to zero)
No Missing Codes Resolution 12 12 Bits
T
MIN
to T
MAX
(3)
Linearity Error ±1 ±1/2 LSB
Full-Scale Calibration Error ±0.47 ±0.37 % of FS
Unipolar Offset ±4 ±3 LSB
Bipolar Offset ±12 ±5 LSB
No Missing Codes Resolution 12 12 Bits
AC ACCURACY
(4)
Spurious Free Dynamic Range 73 78 76 ✻ dB
Total Harmonic Distortion –77 –72 ✻ –75 dB
Signal-to-Noise Ratio 69 72 71 ✻ dB
Signal-to-(Noise + Distortion) Ratio 68 71 70 ✻ dB
Intermodulation Distortion –75 ✻
(F
IN1
= 20kHz, F
IN2
= 23kHz)
TEMPERATURE COEFFICIENTS
(5)
Unipolar Offset ±1 ✻ ppm/°C
Bipolar Offset ±2 ✻ ppm/°C
Full-Scale Calibration ±12 ✻ ppm/°C
POWER SUPPLY SENSITIVITY
Change in Full-Scale Calibration
(6)
+4.75V < V
DD
< +5.25V
Max Change ±1/2 ✻ LSB
CONVERSION TIME (Including Acquisition Time)
t
AQ
+ t
C
at 25°C:
8-Bit Cycle 5.5 5.9 ✻✻µs
12-Bit Cycle 7.5 8 ✻✻µs
12-Bit Cycle, T
MIN
to T
MAX
: 8 8.5 ✻✻µs
SAMPLING DYNAMICS
Sampling Rate at 25°C 125 ✻ kHz
T
MIN
to T
MAX
117 ✻ kHz
Aperture Delay, t
AP
With V
EE
= +5V 20 ✻ ns
With V
EE
= 0V to –15V 1.6 ✻ µs
Aperture Uncertainty (Jitter)
With V
EE
= +5V 300 ✻ ps, rms
With V
EE
= 0V to –15V 10 ✻ ns, rms
Settling time to 0.01% for 1.4 ✻ µs
Full-Scale Input Change