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Application Note 9518
nal inputs are used for channels 1 and 5, jumpers JP4, JP7,
JP12, and JP15 must be removed from the board.
The bottom row of jumpers (JP20 to JP35) provide a simple
single pole RC Filter for each channel input. Putting the
jumper in the lower position means the input will be non-?l-
tered while moving the jumper to the upper position will pro-
vide ?ltering.
Single Ended to Differential Converters
The board also includes 2 single ended to differential con-
verters for use with external or on-board analog input volt-
ages. The external inputs to the converters are the V INX and
V INY sockets on the boards. It is recommended that twisted
pair wire be used to connect to external analog inputs to
V INX and V INY on the evaluation board. Jumpers J4, J5,
J14, and J15 used in conjunction with jumpers J6 - J13 and
J16 - J23 connect the outputs of the single ended to differen-
tial converters to the inputs of the HI7188. The board is set
up such that an inherent gain of 2 exists in these converters.
So if V INX = 1V, the output of the single ended to differential
converter will be ± 1V. Note that use of these single ended to
differential converters may limit the performance of the
HI7188.
The evaluation board also contains on-board resistor strings
used to generate inputs to the single ended to differential
converters. These on-board voltages provide the user with a
quick method of checking operation of the setup as well as
the various gains of the HI7188. With the on-board voltages
V REFH and V MINUS set to +2.5V and -2.5V respectively, the
following nominal “tap” voltages result:
TAP1 = 1.4996V
TAP2 = 1.0004V
TAP3 = 0.12478V
TAP4 = -0.12478V
V REFH and V MINUS are adjustable via R 1 and R 37 respec-
tively.
Common Mode Input
The jumper JP2 is provided to allow the V CM Pin to be tied
to either analog ground (lower position), or V RHI (upper posi-
tion). The input voltage for V CM should always be set at the
midpoint between AV DD and AV SS . So if AV DD = +5V and
AV SS = -5V, V CM should be at analog ground. Please note
the HI7188 is speci?ed for AV DD = +5V and AV SS = -5V
operation only.
Clock Input
The master clock into the HI7188 can be supplied by either a
crystal connected between the OSC 1 and OSC 2 pins or a
CMOS compatible clock signal connected to the OSC 1 pin.
The input sampling frequency, modulator clock frequency,
line noise rejection frequencies, output update rate, and cali-
bration times are all directly related to the master clock fre-
quency, f OSC . For the recommended 3.6864MHz clock the
available line noise rejection frequencies are 50Hz and
60Hz. If line noise rejection of 60Hz is chosen the output
update rate is 16.67ms. Please note that the HI7188 Speci?-
cations are written for a 3.6864MHz clock only.
4
The HI7188 Evaluation Board allows for the HI7188 Master
Clock to be supplied externally, generated by the on-board
crystal oscillator, or generated by an on-board crystal used
in conjunction with the on-chip oscillator circuitry. The jumper
JP3 must be removed from the board when using an exter-
nal clocking source and the external clocking source must be
disconnected from the board when using either of the on-
board clocking methods. When JP3 is in the left most posi-
tion the 3.6864MHz crystal oscillator is selected and when
JP3 is in the right most position the combination 3.6864MHz
crystal and on-chip oscillator clocking method is selected.
For the best noise performance the crystal should be
removed from the board when using the crystal oscillator
and vice versa. Both the crystal and crystal oscillator should
be removed when using an external clock.
Digital Inputs/Outputs
The digital input and output pins of the HI7188 are interfaced
through line drivers and receivers to the 25 pin D connector
at the right edge of the board. These pins are activated and
deactivated by the evaluation software which controls the
functionality of the HI7188. Please refer to the HI7188 Data
Sheet for a detailed description of the functionality of these
pins.
U4 on the Evaluation Board is an “open socket” which is
used in conjunction with the test modes of the HI7188 for
Intersil internal testing and evaluation.
Software Description
The HI7188 Evaluation Software is designed to work with
the HI7188 Evaluation Hardware when connected to a
printer port on a standard PC. Both the executable ?le and
the source code are provided. The source code was com-
piled with Borland’s Turbo C++, Version 3.
The HI7188 Evaluation Software allows the user to operate
the device in most of the various con?gurations the part sup-
ports. The software is menu driven for ease of use. The sim-
pli?ed ?ow diagram shown in Figure 1 gives a good feel for
the structure of the software.
The HI7188 Evaluation Software includes capability that
allows the user to quickly perform the following functions:
1. Program the HI7188 without detailed knowledge of the
Serial Interface.
2. Determine and/or save the current HI7188 configuration.
3. Read/Write all registers without detailed knowledge of the
Serial Interface.
4. Continuously read the Data RAM and display statistics
based on the conversion results.
5. Move to any menu from any menu in a single keystroke.
6. Initialize the HI7188 in a single keystroke.
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