Datasheet
ADS7842
SBAS103C
4
www.ti.com
ELECTRICAL CHARACTERISTICS: +2.7V
At T
A
= –40°C to +85°C, +V
CC
= +2.7V, V
REF
= +2.5V, f
SAMPLE
= 125kHz, and f
CLK
= 16 • f
SAMPLE
= 2MHz, unless otherwise noted.
ADS7842E ADS7842EB
✻ Same specifications as ADS7842E.
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to +2.5V, one LSB is 610mV.
(2) First five harmonics of the test frequency.
(3) Power-down mode at end of conversion when WR, CS, and BUSY conditions have all been met. Refer to Table III of this data sheet.
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits
ANALOG INPUT
Full-Scale Input Span 0 V
REF
✻✻V
Capacitance 25 ✻ pF
Leakage Current ±1 ✻ µA
SYSTEM PERFORMANCE
No Missing Codes 12 ✻ Bits
Integral Linearity Error ±2 ±1 LSB
(1)
Differential Linearity Error ±0.8 ±0.5 ±1LSB
Offset Error ±5 ✻ LSB
Offset Error Match 0.15 1.0 ✻✻ LSB
Gain Error ±4 ±3LSB
Gain Error Match 0.1 1.0 ✻✻ LSB
Noise 30 ✻ µVrms
Power-Supply Rejection 70 ✻ dB
SAMPLING DYNAMICS
Conversion Time 12 ✻ Clk Cycles
Acquisition Time 3 ✻ Clk Cycles
Throughput Rate 125 ✻ kHz
Multiplexer Settling Time 500 ✻ ns
Aperture Delay 30 ✻ ns
Aperture Jitter 100 ✻ ps
DYNAMIC CHARACTERISTICS
Total Harmonic Distortion
(2)
3.6V ≥ V
CC
≥ 3.0V, V
IN
= 2.5Vp-p –77 –70 –79 –74 dB
at 10kHz
3.0V > V
CC
≥ 2.7V, V
IN
= 2.5Vp-p –77 –70 ✻✻ dB
at 10kHz
Signal-to-(Noise + Distortion) 3.6V ≥ V
CC
≥ 3.0V, V
IN
= 2.5Vp-p 68 71 70 72 dB
at 10kHz
3.0V > V
CC
≥ 2.7V, V
IN
= 2.5Vp-p 68 71 ✻✻ dB
at 10kHz
Spurious-Free Dynamic Range 3.6V ≥ V
CC
≥ 3.0V, V
IN
= 2.5Vp-p 72 78 76 80 dB
at 10kHz
3.0V > V
CC
≥ 2.7V, V
IN
= 2.5Vp-p 72 78 ✻✻ dB
at 10kHz
Channel-to-Channel Isolation V
IN
= 2.5Vp-p at 50kHz 100 ✻ dB
REFERENCE INPUT
Range 0.1 +V
CC
✻✻V
Resistance DCLK Static 5 ✻ GΩ
Input Current 13 40 ✻✻ µA
f
SAMPLE
= 12.5kHz 2.5 ✻ 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 Straight Binary ✻
External Clock 0.2 2 ✻✻MHz
POWER-SUPPLY REQUIREMENTS
+V
CC
Specified Performance 2.7 3.6 ✻✻V
Quiescent Current 280 650 ✻✻ µA
f
SAMPLE
= 12.5kHz 220 ✻ µA
Power-Down Mode
(3)
, CS = +V
CC
3 ✻ µA
Power Dissipation 1.8 ✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C