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Application Note 9853
Appendix A Description of Architecture
The segmented current source architecture has the ability to
improve the converter’s performance by reducing the
amount of current that is switching at any one time. In
traditional architectures, major transition points required the
converter to switch on or off large amounts of current. In a
traditional 10-bit R/2R ladder design, for example, the
midscale transition required approximately equal amounts of
currents switching on and off. In a segmented current source
arrangement, transitions such as midscale become one in
which you simply have an additional intermediate current
source turning on and several minor ones turning off. In the
case of the HI5760, there are 31 intermediate current
segments that represent the 5 MSBs and ?ve, binary-
Appendix B Pin Descriptions
weighted current sources representing each of the ?ve
LSBs. See the Functional Block Diagram in the datasheet for
a visual representation. To relate the midscale transition
example to the HI5760, consider the following: The code
0111111111 would be represented by 15 intermediate
current segments and each of the 5 LSB current sources all
turned on. To transition to code 1000000000 would simply
require turning off the 5 LSB current sources and turning on
the next intermediate current segment, bringing the total
amount of current switching at this ‘major’ code transition
equal to the same amount switching at 30 other code
transition points in the code ramp from 0 to 1023, so that the
total glitch energy is distributed more evenly.
PIN NO.
1-14
15
16
17
18
19
20, 25
21
22
23
24
26
27
28
PIN NAME
D13 (MSB)
Through D0 (LSB)
SLEEP
REFLO
REFIO
FSADJ
COMP1
ACOM
IOUTB
IOUTA
COMP2
AV DD
DCOM
DV DD
CLK
PIN DESCRIPTION
For the 14-bit, HI5960, these are digital data bit-13, (most significant bit) through digital data bit-0, (least significant
bit). Pins 13 and 14 are NC for the 12-bit, HI5860.
Control Pin for Power-Down Mode. Sleep mode is active high; Connect to ground for normal mode. Sleep pin has
internal 20 μ A active pull-down current.
Connect to analog ground to enable internal 1.2V reference or connect to AV DD to disable internal reference.
Reference voltage input if internal reference is disabled. Reference voltage output if internal reference is enabled. Use
0.1 μ F cap to ground unless overdriving with a waveform.
Full Scale Current Adjust. Use a resistor to ground to adjust full scale output current. Full scale output current
(I OUTFS ) = 32 x V FSADJ /R SET , (maximum I OUTFS = 20mA).
For use in reducing noise. Recommended: Connect 0.1 μ F from COMP1 to AV DD .
Analog Ground.
The complementary current output of the device. Full scale output current is achieved when all input bits are set
to binary 0.
Current output of the device. Full scale output current is achieved when all input bits are set to binary 1.
Connect to ACOM through a 0.1 μ F capacitor.
Analog supply (+3V to +5V).
Digital ground.
Digital supply (+3V to +5V).
Input for clock. Positive edge of clock latches data.
3-4
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