Datasheet
ADS8345
SBAS177C
4
www.ti.com
ELECTRICAL CHARACTERISTICS: +2.7V
At T
A
= –40°C to +85°C, +V
CC
= +2.7V, V
REF
= +1.25V, f
SAMPLE
= 100kHz, and f
CLK
= 24 • f
SAMPLE
= 2.4MHz, unless otherwise noted.
ADS8345E, N ADS8345EB, NB
✻ Same specifications as ADS8345E, N.
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +1.25V, one LSB is 38µV. (2) First nine harmonics of the test frequency. (3) Auto power-down
mode (PD1 = PD0 = 0) active or SHDN = GND.
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 ±1.0 ±0.5 mV
Bipolar Error Match 24 ✻✻ LSB
Gain Error ±0.05 ±0.024 % of FSR
Gain Error Match 14 ✻✻ LSB
Noise 20 ✻ µVrms
Power-Supply Rejection +2.7 < V
CC
< +3.3V 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
When used with Internal Clock 0.024 2.0 ✻✻MHz
Data Transfer Only 0 2.4 ✻✻MHz
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
V
IN
= 2.5Vp-p at 1kHz –95 ✻ dB
Signal-to-(Noise + Distortion) V
IN
= 2.5Vp-p at 1kHz 81 ✻ dB
Spurious-Free Dynamic Range V
IN
= 2.5Vp-p at 1kHz 95 ✻ dB
Channel-to-Channel Isolation V
IN
= 2.5Vp-p at 10kHz 108 ✻ dB
REFERENCE INPUT
Range 0.5 +V
CC
/2 ✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 13 40 ✻✻ µA
DCLK Static 0.001 3 ✻✻ µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels
V
IH
| I
IH
| ≤ +5µA+V
CC
• 0.7 5.5 ✻✻V
V
IL
| I
IL
| ≤ +5µA –0.3 +0.8 ✻✻V
V
OH
I
OH
= –250µA+V
CC
• 0.8 ✻ V
V
OL
I
OL
= 250µA 0.4 ✻ V
Data Format Binary Two’s Complement ✻
POWER-SUPPLY REQUIREMENTS
+V
CC
Specified Performance 2.7 3.6 ✻✻V
Quiescent Current 1.2 1.85 ✻✻ mA
f
SAMPLE
= 10kHz 950 ✻ µA
Power-Down Mode
(3)
, CS = +V
CC
3 ✻ µA
Power Dissipation 3.2 5 ✻✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C