Datasheet

ADS7828
4
SBAS181C
www.ti.com
NOTES: (1) LSB means Least Significant Bit. With V
REF
equal to 5.0V, 1LSB is 1.22mV.
(2) THD measured out to the 9th-harmonic.
ANALOG INPUT
Full-Scale Input Scan Positive Input - Negative Input 0 V
REF
0V
REF
V
Absolute Input Range Positive Input –0.2 +V
DD
+ 0.2 –0.2 +V
DD
+ 0.2 V
Negative Input –0.2 +0.2 –0.2 +0.2 V
Capacitance 25 25 pF
Leakage Current ±1 ±1 µA
SYSTEM PERFORMANCE
No Missing Codes 12 12 Bits
Integral Linearity Error ±1.0 ±2 ±0.5 ±1LSB
(1)
Differential Linearity Error ±1.0 ±0.5 –1, +2 LSB
Offset Error ±1.0 ±3 ±0.75 ±2 LSB
Offset Error Match ±1 ±1 LSB
Gain Error ±1.0 ±3 ±0.75 ±2 LSB
Gain Error Match ±1 ±1 LSB
Noise 33 33 µVRMS
Power-Supply Rejection 82 82 dB
SAMPLING DYNAMICS
Throughput Frequency High Speed Mode: SCL = 3.4MHz 50 50 kHz
Fast Mode: SCL = 400kHz 8 8 kHz
Standard Mode, SCL = 100kHz 2 2 kHz
Conversion Time 66µs
AC ACCURACY
Total Harmonic Distortion V
IN
= 2.5V
PP
at 10kHz –82 –82 dB
(2)
Signal-to-Ratio V
IN
= 2.5V
PP
at 10kHz 72 72 dB
Signal-to-(Noise+Distortion) Ratio V
IN
= 2.5V
PP
at 10kHz 71 71 dB
Spurious-Free Dynamic Range V
IN
= 2.5V
PP
at 10kHz 86 86 dB
Isolation Channel-to-Channel 120 120 dB
VOLTAGE REFERENCE OUTPUT
Range 2.475 2.5 2.525 2.475 2.5 2.525 V
Internal Reference Drift 15 15 ppm/°C
Output Impedance Internal Reference ON 110 110 Ω
Internal Reference OFF 1 1 GΩ
Quiescent Current Int. Ref. ON, SCL and SDA pulled HIGH 1300 1300 µA
VOLTAGE REFERENCE INPUT
Range 0.05 V
DD
0.05 V
DD
V
Resistance 11GΩ
Current Drain High Speed Mode: SCL = 3.4MHz 20 20 µA
DIGITAL INPUT/OUTPUT
Logic Family CMOS CMOS
Logic Levels: V
IH
+V
DD
• 0.7 +V
DD
+ 0.5 +V
DD
• 0.7 +V
DD
+ 0.5 V
V
IL
–0.3 +V
DD
• 0.3 –0.3 +V
DD
• 0.3 V
V
OL
Min. 3mA Sink Current 0.4 0.4 V
Input Leakage: I
IH
V
IH
= +V
DD
+0.5 10 10 µA
I
IL
V
IL
= -0.3 –10 –10 µA
Data Format Straight Straight
Binary Binary
ADS7828 HARDWARE ADDRESS 10010 10010 Binary
POWER-SUPPLY REQUIREMENTS
Power-Supply Voltage, +V
DD
Specified Performance 4.75 5 5.25 4.75 5 5.25 V
Quiescent Current High Speed Mode: SCL = 3.4MHz 750 1000 750 1000 µA
Fast Mode: SCL = 400kHz 300 300 µA
Standard Mode, SCL = 100kHz 150 150 µA
Power Dissipation High Speed Mode: SCL = 3.4MHz 3.75 5 3.75 5 mW
Fast Mode: SCL = 400kHz 1.5 1.5 mW
Standard Mode, SCL = 100kHz 0.75 0.75 mW
Power-Down Mode High Speed Mode: SCL = 3.4MHz 400 400 µA
w/Wrong Address Selected Fast Mode: SCL = 400kHz 150 150 µA
Standard Mode, SCL = 100kHz 35 35 µA
Full Power-Down SCL Pulled HIGH, SDA Pulled HIGH 400 3000 400 3000 nA
TEMPERATURE RANGE
Specified Performance –40 +85 –40 +85 °C
ELECTRICAL CHARACTERISTICS: +5V
At T
A
= –40°C to +85°C, +V
DD
= +5.0V, V
REF
= External +5.0V, SCL Clock Frequency = 3.4MHz (High-Speed Mode), unless otherwise noted.
ADS7828E ADS7828EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS