isolated modulator without
additional hardware. Because the
two inputs are multiplexed, only
one conversion at a time can be
made and not all features are
available for the second channel.
The available features for both
channels are shown in the table
at right.
HCPL-x870 Digital Interface IC
Feature
Conversion Mode
Offset Calibration
Pre-Trigger Mode
Over-Range Detection
Adjustable Threshold Detection
Channel #1
Channel #2
Functional Diagrams
ISOLATION
BOUNDARY
CCLK
CLAT
1
2
3
4
CH1
CONFIG.
INTER-
FACE
CON-
VERSION
INTER-
FACE
16 V
DD
15 CHAN
V
DD1
V
IN+
V
IN–
GND1
1
2
3
4
8
7
DECODE
V
DD2
MCLK
MDAT
GND2
CDAT
MCLK1
MDAT1
14
SCLK
13
SDAT
12 CS
SIGMA-
DELTA
MOD./
ENCODE
5
6
7
8
CH2
THRES-
HOLD
DETECT
&
RESET
6
5
MCLK2
MDAT2
11 THR1
10
OVR1
9
RESET
SHIELD
GND
HCPL-7860 Isolated Modulator
HCPL-x870 Digital Interface IC
Pin Description, Isolated Modulator
Symbol
V
DD1
V
IN+
V
IN–
GND1
Description
Supply voltage input (4.5 V to 5.5 V)
Positive input (± 200 mV
recommended)
Negative input
(normally connected to GND1)
Input ground
Symbol
V
DD2
MCLK
MDAT
GND2
Description
Supply voltage input (4.5 V to 5.5 V)
Clock output (10 MHz typical)
Serial data output
Output ground
1-262
HP [ AGILENT(HEWLETT-PACKARD) ]
