Datasheet

ADS7834
3
SBAS098A
www.ti.com
SPECIFICATIONS
At T
A
= –40°C to +85°C, +V
CC
= +5V, f
SAMPLE
= 500kHz, f
CLK
= 16 • f
SAMPLE
, internal reference, unless otherwise specified.
ADS7834P, E ADS7834PB, EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
ANALOG INPUT
Full-Scale Input Span
(1)
+IN – (–IN) 0 V
REF
✻✻V
Absolute Input Range +IN –0.2 V
REF
+0.2 ✻✻V
–IN –0.2 +0.2 ✻✻V
Capacitance 25 ✻ pF
Leakage Current 1 ✻ µA
SYSTEM PERFORMANCE
Resolution 12 ✻ Bits
No Missing Codes 12 ✻ Bits
Integral Linearity Error ±1 ±2 ±0.5 ±1 LSB
(2)
Differential Linearity Error ±0.8 ±0.5 ±1LSB
Offset Error ±2 ±5 ±1 ✻ LSB
Gain Error
(3)
25°C ±12 ±30 ±7 ±15 LSB
–40°C to +85°C ±50 ±35 LSB
Common-Mode Rejection DC, 0.2Vp-p 70 ✻ dB
1MHz, 0.2Vp-p 50 ✻ dB
Noise 60 ✻ µVrms
Power Supply Rejection Worst Case ∆, +V
CC
= 5V ±5% 1.2 ✻ LSB
SAMPLING DYNAMICS
Conversion Time 1.625 ✻ µs
Acquisition Time 0.350 ✻ µs
Throughput Rate 500 ✻ kHz
Aperture Delay 5 ✻ ns
Aperture Jitter 30 ✻ ps
Step Response 350 ✻ ns
DYNAMIC CHARACTERISTICS
Signal-to-Noise Ratio V
IN
= 5Vp-p at 10kHz 72 ✻ dB
Total Harmonic Distortion
(4)
V
IN
= 5Vp-p at 10kHz –78 –72 –82 –75 dB
Signal-to-(Noise+Distortion) V
IN
= 5Vp-p at 10kHz 68 70 70 72 dB
Spurious Free Dynamic Range V
IN
= 5Vp-p at 10kHz 72 78 75 82 dB
Usable Bandwidth SNR > 68dB 350 ✻ kHz
REFERENCE OUTPUT
Voltage I
OUT
= 0 2.475 2.50 2.525 2.48 ✻ 2.52 V
Source Current
(5)
Static Load 50 ✻ µA
Drift I
OUT
= 0 20 ✻ ppm /°C
Line Regulation 4.75V ≤ V
CC
≤ 5.25V 0.6 ✻ mV
REFERENCE INPUT
Range 2.0 2.55 ✻✻V
Resistance
(6)
to Internal Reference Voltage 10 ✻✻✻ kΩ
DIGITAL INPUT/OUTPUT
Logic Family CMOS ✻
Logic Levels:
V
IH
|I
IH
| ≤ +5µA 3.0 V
CC
+0.3 ✻✻V
V
IL
|I
IL
| ≤ +5µA –0.3 0.8 ✻✻V
V
OH
I
OH
= –500µA 3.5 ✻✻V
V
OL
I
OL
= 500µA 0.4 ✻✻V
Data Format Straight Binary ✻
POWER SUPPLY REQUIREMENT
+V
CC
Specified Performance 4.75 5.25 ✻✻V
Quiescent Current f
SAMPLE
= 500kHz 2.2 ✻ mA
Power-Down 0.5 ✻ mA
Power Dissipation f
SAMPLE
= 500kHz 11 20 ✻✻ mW
Power-Down 2.5 ✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
✻ Specifications same as ADS7834P,E.
NOTES: (1) Ideal input span, does not include gain or offset error. (2) LSB means Least Significant Bit, with V
REF
equal to +2.5V, one LSB is 610µV. (3) Measured
relative to an ideal, full-scale input (+IN – (–IN)) of 2.499V. Thus, gain error includes the error of the internal voltage reference. (4) Calculated on the first nine
harmonics of the input frequency. (5) If the internal reference is required to source current to an external load, the reference voltage will change due to the internal
10kΩ resistor. (6) Can vary ±30%.