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Application Note 9518
HI7188 Evaluation Board Simpli?ed Block Diagram
J2
EXTERNAL DIFFERENTIAL
INPUT CONNECTOR
16 CHANNELS
J6 - J13, J16 - J23
CRYSTAL
OSCILLATOR
16 CHANNELS
EXTERNAL
CRYSTAL
CLOCK
JP4 - JP19
CALIBRATION
JUMPERS
16 CHANNELS
V INH1
V INL1
OSC 1
JP20 - JP35
FILTER JUMPERS
V INH8
OSC 2
16 CHANNELS
V INL8
LINE
V RHI
DIGITAL
DRIVERS
TO
J4, J5, J14, J15
ON-BOARD
V RLO
I/O
AND
RECEIVERS
PC
REFERENCES
V CM
EXTERNAL
SINGLE TO DIFFERENTIAL
CONVERTERS AND
V REF
DGND
TAP VOLTAGES
HI7188
The actual reference voltage is given by V REF = V RHI -
V RLO . The V RLO pin is hard wired to analog ground on the
evaluation board which means that V REF = V RHI . The nomi-
nal reference voltage for the HI7188 is 2.5V. Larger values of
V REF can be used without degradation in performance.
Smaller values of V REF can also be used, but performance
will be degraded since the system noise becomes larger rel-
ative to the LSB size.
The jumper JP1 controls whether the V RHI pin of the HI7188
is connected to an external reference, which connects to the
V REFH SMA pad, or to the on-board reference which is pre-
set to 2.5V. If JP1 is in the far right position V RHI is con-
nected to the on-board low noise reference and when JP2 is
in the far left position V RHI is connected to the external refer-
ence. If an external reference is used, it is recommended
that a twisted pair wire be used and soldered directly to the
SMA pad on the evaluation board. The potentiometer R 1 can
be used to vary the on-board reference voltage. Please note
that the speci?cations for the HI7188 are tested with V REF
set to 2.5V. V RHI must always be greater than V RLO for
proper operation of the device.
Analog Inputs
The 8 analog inputs on the HI7188 are fully differential inputs
with programmable gain capabilities. The inputs accept both
unipolar and bipolar input signals and gains range from 1 to 8.
The user must pay careful attention to the input driver and/or
3
input filter circuitry as the input sampling rate (or modulator
clock rate) varies with the selected PGIA gain, and the input
impedance is dependent upon the modulator clock rate.
Please refer to the data sheet for more information.
External analog inputs come onto the board via the 34 pin
connector (J2) located at the upper left hand corner of the
board. Pin 1 is the bottom left pin on the connector.
The top row of jumpers (J6 - J13, J16 - J23) are used in con-
junction with the single ended to differential converters. If an
external input on J2 is being used for a particular channel
then the top row jumpers for that channel must be removed
from the board. For example, if external inputs are used for
channels 1 and 5 and come into the board on J2, jumpers
J6, J10, J16, and J20 must be removed from the board.
The middle row of jumpers, JP4 - JP19 can be used to cali-
brate the HI7188 in the gain of 1 mode by using the on-board
reference voltage. For example, to perform a positive full
scale calibration on channel 3 jumper JP9 is in the upper
position (V REF ) while JP8 is in the lower position (AGND).
For a negative full scale calibration on channel 3, jumper
JP9 is in the lower position (AGND) and jumper JP8 is in the
upper position (V REF ). To offset calibrate channel 6 on the
HI7188 jumpers JP13 and JP14 are in the lower position
(AGND). If an external or on-board input is being used for a
particular channel then the middle row jumpers for that chan-
nel must be removed from the board. For example, if exter-
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