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MCP4901-E/P датащи(PDF) 33 Page - Microchip Technology

номер детали MCP4901-E/P
подробное описание детали  8/10/12-Bit Voltage Output Digital-to-Analog Converter with SPI Interface
PDF  50 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP4901-E/P датащи(HTML) 33 Page - Microchip Technology

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 2010 Microchip Technology Inc.
DS22248A-page 33
MCP4901/4911/4921
6.8
Building Programmable Current
Source
Example 6-6 shows an example for building a
programmable current source using a voltage follower.
The current sensor (sensor resistor) is used to convert
the DAC voltage output into a digitally-selectable
current source.
Adding the resistor network from Example 6-2 would
be advantageous in this application. The smaller Rsense
is, the less power is dissipated across it. However, this
also reduces the resolution that the current can be
controlled with. The voltage divider, or “window”, DAC
configuration would allow the range to be reduced, thus
increasing the resolution around the range of interest.
When working with very small sensor voltages, plan on
eliminating the amplifier’s offset error by storing the
DAC's setting under known sensor conditions.
EXAMPLE 6-6:
DIGITALLY-CONTROLLED CURRENT SOURCE.
DAC
RSENSE
Ib
Load
IL
VDD
SPI
3-wire
VCC+
VCC–
VOUT
I
L
V
OUT
R
sense
---------------
 1
+
------------
=
I
b
I
L
----
=
G = Gain select (1x or 2x)
Dn = Digital value of DAC (0-255) for MCP4901/MCP4902
V
OUT
V
REF
G
D
n
2
N
------

=
= Digital value of DAC (0-1023) for MCP4911/MCP4912
= Digital value of DAC (0-4095) for MCP4921/MCP4922
N = DAC Bit Resolution
Common-Emitter Current Gain
where
VREF
VDD or VREF
MCP4901
MCP4911
MCP4921
(a) Single Output DAC:
(b) Dual Output DAC:
MCP4902
MCP4912
MCP4922



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