Datasheet

ADS8324
3
SBAS172A
www.ti.com
ELECTRICAL CHARACTERISTICS: +V
CC
= +1.8V
At –40°C to +85°C, V
REF
= 0.9V, –In = 0.9V, f
SAMPLE
= 50kHz, and f
CLK
= 24 • f
SAMPLE
, unless otherwise specified.
ADS8324E ADS8324EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 14 ✻ Bits
ANALOG INPUT
Full-Scale Input Span +In – (–In) –V
REF
+V
REF
✻✻V
Absolute Input Range +In –0.1
V
CC
+ 0.1 ✻✻V
–In 0.8 +1.0 ✻✻V
Capacitance 25 ✻ pF
Leakage Current 1 ✻ nA
SYSTEM PERFORMANCE
No Missing Codes 14 14 Bits
Integral Linearity Error ±3 ±2
LSB
Bipolar Zero Error ±4 ±8 ±2 ±4LSB
Bipolar Zero Error Drift ±0.1 ✻ μV/°C
Gain Error ±4 ±8 ✻✻LSB
Gain Temperature Drift ±0.4 ✻ ppm/°C
Noise 60 ✻ μVrms
Common-Mode Rejection Ratio at D
CC
74 ✻ dB
Power Supply Rejection Ratio +1.8V < V
CC
< +3.6V 3 ✻ LSB
(1)
SAMPLING DYNAMICS
Conversion Time 16 ✻
Clk Cycles
Acquisition Time 4.5 ✻ Clk Cycles
Throughput Rate 50 ✻ kHz
Clock Frequency Range 0.024 1.8 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion V
IN
= 5Vp-p at 10kHz –84 –86 dB
SINAD V
IN
= 5Vp-p at 10kHz 77 78 dB
Spurious Free Dynamic Range V
IN
= 5Vp-p at 10kHz 85 86 dB
SNR 78 ✻ dB
REFERENCE INPUT
Voltage Range 0.5 V
CC
/2 ✻✻V
Resistance CS = GND, f
SAMPLE
= 0Hz 5 ✻ GΩ
CS = V
CC
5 ✻ GΩ
Current Drain 40 80 ✻✻μA
f
SAMPLE
= 10kHz 0.8 ✻ μA
CS = V
CC
0.1 3 ✻ μA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels:
V
IH
I
IH
= +5μA1.3V
CC
+ 0.3 ✻✻V
V
IL
I
IL
= +5μA–0.30.5✻✻V
V
OH
I
OH
= –250μA1.4 ✻ V
V
OL
I
OL
= 250μA0.4✻ V
Data Format Binary Two’s Complement ✻
POWER SUPPLY REQUIREMENTS
V
CC
Specified Performance 1.8 ✻ V
V
CC
Range
(2)
1.8 3.6 ✻✻V
Quiescent Current 1400 1700 ✻✻μA
f
SAMPLE
= 10kHz
(3, 4)
250 ✻ μA
Power Dissipation V
CC
= 1.8V 2.5 3.0 ✻✻mW
Power Down CS = V
CC
0.3 3.0 ✻✻μA
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
✻ Specifications same as ADS8324E.
NOTES: (1) LSB means Least Significant Bit. (2) See Typical Performance Curves for more information. (3) f
CLK
= 1.2MHz, CS = V
CC
for 216 clock cycles out
of every 240. (4) See the Power Dissipation section for more information regarding lower sample rates.