Datasheet

ADS7817
3
SBAS066A
ELECTRICAL CHARACTERISTICS
At –40°C to +85°C, +V
CC
= +5V, V
REF
= +2.5V, f
SAMPLE
= 200kHz, f
CLK
= 16 • f
SAMPLE
, –In = +2.5V, unless otherwise specified.
ADS7817 ADS7817B ADS7817C
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span +In – (–In) –V
REF
+V
REF
✻✻✻✻V
Absolute Input Voltage +In –0.3 V
CC
+0.3 ✻✻✻✻V
–In –0.3 4 ✻✻✻✻V
Capacitance 15 ✻✻pF
Leakage Current ±1 ✻✻µA
SYSTEM PERFORMANCE
Resolution 12 ✻✻Bits
No Missing Codes 11 12 ✻ Bits
Integral Linearity Error ±1 ±2 ±0.8 ±2 ±0.5 ±1 LSB
(1)
Differential Linearity Error ±1 ±2 ±0.7 ±1 ±0.4 ±1 LSB
Offset Error ±1 ±6 ✻✻ ✻✻LSB
Gain Error ±0.5 ±4 ✻✻ ✻✻LSB
Noise 63 ✻✻µVrms
Common-Mode Rejection 80 ✻✻dB
Power Supply Rejection 82 ✻✻dB
SAMPLING DYNAMICS
Conversion Time 12 ✻✻
Clk Cycles
Acquisition Time 1.5 ✻✻ Clk Cycles
Throughput Rate 200 ✻✻kHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
IN
= 5.0Vp-p at 1kHz –83 ✻✻dB
V
IN
= 5.0Vp-p at 5kHz –81 ✻✻dB
SINAD V
IN
= 5.0Vp-p at 1kHz 71 ✻✻dB
Spurious Free Dynamic Range V
IN
= 5.0Vp-p at 1kHz 86 ✻✻dB
REFERENCE INPUT
Voltage Range 0.1 2.5 ✻✻✻✻V
Resistance CS = V
CC
5 ✻✻GΩ
CS = GND, f
SAMPLE
= 0Hz 5 ✻✻GΩ
Current Drain At Code FF8h 20 100 ✻✻ ✻✻µA
f
SAMPLE
= 12.5kHz 1.3 20 ✻✻ ✻✻µA
CS = V
CC
0.001 3 ✻✻ ✻✻µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻✻
Logic Levels:
V
IH
I
IH
= +5µA3 +V
CC
+0. 3 ✻✻✻✻V
V
IL
I
IL
= +5µA –0.3 0.8 ✻✻✻✻V
V
OH
I
OH
= –250µA 3.5 ✻✻V
V
OL
I
OL
= 250µA 0.4 ✻✻V
Data Format Binary Two’s Complement ✻✻
POWER SUPPLY REQUIREMENTS
V
CC
Specified Performance 4.75 5.25 ✻✻✻✻V
Quiescent Current 460 800 ✻✻ ✻✻µA
f
SAMPLE
= 12.5kHz
(2, 3)
40 ✻✻µA
f
SAMPLE
= 12.5kHz
(3)
330 ✻✻µA
Power Down CS =V
CC
, f
SAMPLE
= 0Hz 3 ✻✻µA
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻✻✻°C
✻ Specifications same as ADS7817.
NOTE: (1) LSB means Least Significant Bit, with V
REF
equal to +2.5V, one LSB is 1.22mV. (2) f
CLK
= 3.2MHz, CS = V
CC
for 241 clock cycles out of every 256.
(3) See the Power Dissipation section for more information regarding lower sample rates.