Datasheet

2ADS7835
®
SPECIFICATIONS
At T
A
= –40°C to +85°C, +V
CC
= +5V, f
SAMPLE
= 500kHz, f
CLK
= 16 • f
SAMPLE
, and internal +2.5V reference, unless otherwise specified.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN
assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject
to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not
authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.
ADS7835E ADS7835EB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits
ANALOG INPUT
(1)
Input Voltage Range ±2.5V with the 2.5V –V
REF
+V
REF
✻✻V
Internal Reference
Input Capacitance 25 ✻ pF
Input Resistance During Conversion (CONV = LOW) 2 ✻ kΩ
SYSTEM PERFORMANCE
No Missing Codes 12 ✻ Bits
Integral Linearity ±1 ±2 ±0.5 ±1 LSB
(2)
Differential Linearity ±0.8 ±0.5 ±1 LSB
Bipolar Offset Error ±2 ±10 ±1 ±5 LSB
Positive Fulll-Scale Error
(3)
At 25°C ±12 ±20 ±7 ±12 LSB
–40°C to +85°C ±35 ±25 LSB
Negative Full-Scale Error
(3)
At 25°C ±12 ±20 ±7 ±12 LSB
–40°C to +85°C ±35 ±25 LSB
Noise 200 ✻ µVrms
Power Supply Rejection Ratio Worst-Case ∆, +V
CC
= 5V ±5% 0.3 ✻ 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 375 ✻ 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
REFERENCE OUTPUT
Voltage I
OUT
= 0 2.475 2.50 2.525 2.48 ✻ 2.52 V
Source Current
(5)
Static Load 50 ✻ µA
Line Regulation 4.75V ≤ V
CC
≤ 5.25V 0.2 ✻ mV
REFERENCE INPUT
Range 2.3 2.9 ✻✻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 Binary Two’s Complement ✻
POWER SUPPLY REQUIREMENT
+V
CC
Specified Performance 4.75 5.25 ✻✻V
Quiescent Current f
SAMPLE
= 500kHz 3.5 ✻ mA
Power-Down 0.5 ✻ mA
Power Dissipation 17.5 30 ✻✻ mW
Power-Down 2.5 ✻ mW
TEMPERATURE RANGE
Specified Performance –40 +85 ✻✻°C
✻ Specifications same as ADS7835E.
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 1.22mV. (3) Measured
relative to an ideal positive full scale of 2.499V for positive full-scale error. Measured relative to an ideal negative full scale of –2.499V for negative full-scale error.
(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%.