Datasheet

ADS8345
SBAS177C
3
www.ti.com
ELECTRICAL CHARACTERISTICS: +5V
At T
A
= 40°C to +85°C, +V
CC
= +5V, V
REF
= +2.5V, f
SAMPLE
= 100kHz, and f
CLK
= 24 f
SAMPLE
= 2.4MHz, unless otherwise noted.
ADS8345E, N ADS8345EB, NB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 16 Bits
ANALOG INPUT
Full-Scale Input Span Positive Input-Negative Input V
REF
+V
REF
✻✻V
Absolute Input Range +IN 0.2
+V
CC
+ 0.2
✻✻V
IN 0.2
+V
CC
+ 0.2
✻✻V
Capacitance 25 pF
Leakage Current ±1 µA
SYSTEM PERFORMANCE
No Missing Codes 14 15 Bits
Integral Linearity Error ±8 ±6LSB
Bipolar Error ±2 ±1mV
Bipolar Error Match 48 ✻✻LSB
(1)
Gain Error ±0.05 ±0.024 %
Gain Error Match 1.0 4 ✻✻ LSB
Noise 20 µVrms
Power-Supply Rejection +4.75V < V
CC
< 5.25V 3 LSB
(1)
SAMPLING DYNAMICS
Conversion Time 16 CLK Cycles
Acquisition Time 4.5 CLK Cycles
Throughput Rate 100 kHz
Multiplexer Settling Time 500 ns
Aperture Delay 30 ns
Aperture Jitter 100 ps
Internal Clock Frequency SHDN = V
DD
2.4 MHz
External Clock Frequency 0.024 2.4 ✻✻MHz
Data Transfer Only 0 2.4 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
V
IN
= 5Vp-p at 10kHz 96 dB
Signal-to-(Noise + Distortion) V
IN
= 5Vp-p at 10kHz 85 dB
Spurious-Free Dynamic Range V
IN
= 5Vp-p at 10kHz 98 dB
Channel-to-Channel Isolation V
IN
= 5Vp-p at 10kHz 105 dB
REFERENCE INPUT
Range 0.5 +V
CC
/2 ✻✻V
Resistance DCLK Static 5 G
Input Current 40 100 ✻✻ µA
DCLK Static 0.001 3 ✻✻ µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS
Logic Levels
V
IH
| I
IH
| +5µA 3.0 5.5 ✻✻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 Twos Complement
POWER-SUPPLY REQUIREMENTS
+V
CC
Specified Performance 4.75 5.25 ✻✻V
Quiescent Current 1.5 2.0 ✻✻ mA
f
SAMPLE
= 10kHz 1.2 mA
Power-Down Mode
(3)
, CS = +V
CC
3 µA
Power Dissipation 7.5 10 ✻✻ mW
TEMPERATURE RANGE
Specified Performance 40 +85 ✻✻°C
Same specifications as ADS8345E, N.
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +2.5V, one LSB is 76µV. (2) First nine harmonics of the test frequency. (3) Auto power-down mode
(PD1 = PD0 = 0) active or SHDN = GND.