Datasheet

ADS7830
www.ti.com SBAS302C –DECEMBER 2003–REVISED OCTOBER 2012
ELECTRICAL CHARACTERISTICS: +2.7V
At T
A
= –40°C to +125°C, +V
DD
= +2.7V, V
REF
= +2.5V, and SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless
otherwise noted.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUT
Full-Scale Input Scan Positive Input – Negative Input 0 V
REF
V
Positive Input –0.2 +V
DD
+ 0.2 V
Absolute Input Range
Negative Input –0.2 +0.2 V
Capacitance 25 pF
Leakage Current ±1 µA
SYSTEM PERFORMANCE
No Missing Codes 8 Bits
Integral Linearity Error ±0.1 ±0.5 LSB
(1)
Differential Linearity Error ±0.1 ±0.5 LSB
Offset Error +0.5 +1 LSB
Offset Error Match ±0.05 ±0.25 LSB
Gain Error ±0.1 ±0.5 LSB
Gain Error Match ±0.05 ±0.25 LSB
Noise 100 µV
RMS
Power-Supply Rejection 72 dB
SAMPLING DYNAMICS
High-Speed Mode: SCL = 3.4MHz 70 kSPS
(2)
Throughput Frequency Fast Mode: SCL = 400kHz 10 kSPS
Standard Mode, SCL = 100kHz 2.5 kSPS
Conversion Time 5 µs
AC ACCURACY
Total Harmonic Distortion V
IN
= 2.5V
PP
at 1kHz –72 dB
(3)
Signal-to-Ratio V
IN
= 2.5V
PP
at 1kHz 50 dB
Signal-to-(Noise+Distortion) Ratio V
IN
= 2.5V
PP
at 1kHz 49 dB
Spurious-Free Dynamic Range V
IN
= 2.5V
PP
at 1kHz 68 dB
Isolation Channel-to-Channel 90 dB
VOLTAGE REFERENCE OUTPUT
T
A
= –40°C to +85°C 2.48 2.52 V
Range
T
A
= –40°C to +125°C 2.47 2.53 V
T
A
= –40°C to +85°C 15 ppm/°C
Internal Reference Drift
T
A
= –40°C to +125°C 40 ppm/°C
Internal Reference ON 110 Ω
Output Impedance
Internal Reference OFF 1 GΩ
Internal Reference ON,
Quiescent Current 850 µA
SCL and SDA pulled HIGH
VOLTAGE REFERENCE INPUT
Range 0.05 V
DD
V
Resistance 1 GΩ
Current Drain High-Speed Mode: SCL= 3.4MHz 20 µA
(1) LSB means least significant bit. When V
REF
= 2.5V, 1LSB is 9.8mV.
(2) kSPS means kilo samples-per-second.
(3) THD measured out to the 9th-harmonic.
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