HI7190EVAL Intersil, HI7190EVAL Datasheet - Page 6

• Manufacturer Part Number: HI7190EVAL
• Description: EVALUATION PLATFORM HI7190
• Manufacturer: Intersil

Specifications of HI7190EVAL

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 200k
• Data Interface: Serial
• Inputs Per Adc: 1 Differential
• Input Range: ±2.5 V
• Power (typ) @ Conditions: 15mW @ 200kSPS
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: HI7190
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Executing the Program: Change directory (cd) into the
directory containing the 7190BTA5.EXE file. At the DOS
prompt type 7190BTA5 [return]. The software reminds the
user to apply power to the board before continuing. At this
point the software is menu driven and self explanatory. How-
ever, it is important that the user has read the previous sec-
tion, Software Description, before starting the evaluation.
Software Clarifications
Resetting the DUT
Writing the Control Register
Invalid Inputs
Notch Frequency Input
Entering s from the Main Menu resets the HI7190 to its
initial state. The initial state of the HI7190 is as follows:
offset binary data coding, notch frequency of 30Hz, Self
Calibration mode, gain = 1, bipolar mode. The burn-out
current and sleep mode bits are inactive. The Serial
Interface configuration is MSB first bit positioning,
descending byte order, bidirectional I/O pin.
Caution should be taken when writing the Control Regis-
ter via the Write Menu. The least significant byte con-
tains
configuration that must be maintained when running the
software provided. To insure proper functionality of the
evaluation software, the Serial Interface must be config-
ured in MSB first mode, descending byte order and bidi-
rectional I/O pin operation. This configuration is
maintained by writing logic zeros into the 3 least signifi-
cant bits of the Control Register.
Entering invalid inputs at some menu prompts will lock
up the software. Generally a CTL-C will return the user to
the DOS prompt.
When executing from the Custom Menu (of Change
Mode Menu) the notch frequency value must be entered
in decimal. That is, 2kHz is entered as 2000.
information
regarding
the
Serial
Application Note 9505
Interface
6
Bypassing Calibration
Display of Data Register in Continuous Mode
NOTE: The CTRL input on the keyboard is used to “normalize” the
statistical output. For example, the maximum voltage is set to 5.5V
and the minimum is set to -5.5V. The maximum/minimum results dis-
played from then on will include only those conversions read since
“normalization”.
The Dynamic Range and ENOB Equations are as follows:
Dynamic Range = 10log
ENOB
V
V
F
N
RMS
REFNOISE
The HI7190 calibration algorithm can be effectively
bypassed by writing all zeros into the Offset Calibration
Register and 800000 (hex) into the Positive and Nega-
tive Full Scale Calibration Registers if operating in bipo-
lar mode. If operation is in unipolar mode write all zeros
into the Offset Calibration Register and 800000 (hex) into
the Positive Full Scale Calibration Register.
Entering 2 from the Read Menu invokes a continuous read
of the Data Register. The following data is displayed: 1)
The binary output stream read from the HI7190, 2) The
binary output stream converted to hex, 3) The binary out-
put stream converted to volts, 4) The mean voltage of the
last 10 conversion results, 5) The maximum voltage result,
6) the minimum voltage result, 7) The difference between
the maximum voltage and minimum voltage, and 8) stan-
dard deviation, dynamic range and ENOB, which is
updated in groups of 10 conversions.
=
Notch Frequency
=
=
V
------------------------------------ -
Dynamic Range 1.76
----------------------------------------------------------- -
MAX
=
6.6
–
V
4.452 10
6.02
MIN
10
--------------------------------------------------------
V
–
2
RMS
–
14
2.5
–
V
0.275 F
2
REFNOISE
2
2
N