AD5331BRU Analog Devices Inc, AD5331BRU Datasheet - Page 22

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AD5331BRU

Manufacturer Part Number
AD5331BRU
Description
IC DAC 10BIT SNGL VOUT 20TSSOP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD5331BRU

Rohs Status
RoHS non-compliant
Settling Time
7µs
Number Of Bits
10
Data Interface
Parallel
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
1.25mW
Operating Temperature
-40°C ~ 105°C
Mounting Type
Surface Mount
Package / Case
20-TSSOP

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AD5330/AD5331/AD5340/AD5341
a system, all the DACs can be updated simultaneously using a
common LDAC line. A common CLR line can also be used to
reset all DAC outputs to zero.
ADDRESS
PROGRAMMABLE CURRENT SOURCE
Figure 47 shows the AD5330/AD5331/AD5340/AD5341 used
as the control element of a programmable current source. In
this example, the full-scale current is set to 1 mA. The output
voltage from the DAC is applied across the current setting
resistor of 4.7 kΩ in series with the 470 Ω adjustment poten-
tiometer, which gives an adjustment of about ±5%. Suitable
transistors to place in the feedback loop of the amplifier include
the BC107 and the 2N3904, which enable the current source to
operate from a minimum V
determined by the operating characteristics of the transistor.
Suitable amplifiers include the
having rail-to-rail operation on their outputs. The current for
any digital input code and resistor value can be calculated as
follows:
where:
G is the gain of the buffer amplifier (1 or 2).
D is the digital equivalent of the digital input code.
N is the DAC resolution (8, 10, or 12 bits).
R is the sum of the resistor plus adjustment potentiometer
in kilo ohms.
ENABLE
CODED
HBEN*
LDAC
CLR
WR
I
=
G
×
G1
A1
B1
V
Figure 46. Decoding Multiple DAC Devices
REF
74HC139
DGND
V
V
×
DD
CC
2 (
N
D
1Y0
1Y1
1Y2
1Y3
×
R
SOURCE
)
mA
*AD5341 ONLY
AD820
of 6 V. The operating range is
and the OP295, both
AD5330/AD5331/
AD5330/AD5331/
AD5330/AD5331/
AD5330/AD5331/
AD5340/AD5341
AD5340/AD5341
AD5340/AD5341
AD5340/AD5341
HBEN*
WR
LDAC
CLR
CS
HBEN*
WR
LDAC
CLR
CS
HBEN*
WR
LDAC
CLR
CS
HBEN*
WR
LDAC
CLR
CS
INPUTS
INPUTS
INPUTS
INPUTS
DATA
DATA
DATA
DATA
Rev. A | Page 22 of 28
POWER SUPPLY BYPASSING AND GROUNDING
In any circuit where accuracy is important, careful consid-
eration of the power supply and ground return layout helps
to ensure the rated performance. The printed circuit board on
which the AD5330/AD5331/AD5340/AD5341 are mounted
should be designed so that the analog and digital sections are
separated and confined to certain areas of the board. If the
device is in a system where multiple devices require an AGND-
to-DGND connection, the connection should be made at one
point only. The star ground point should be established as
closely as possible to the device. The AD5330/AD5331/
AD5340/AD5341 should have ample supply bypassing of
10 μF in parallel with 0.1 μF on the supply located as close to
the package as possible, ideally right up against the device.
The 10 μF capacitors are the tantalum bead type. The 0.1 μF
capacitor should have low effective series resistance (ESR) and
effective series inductance (ESI), like the common ceramic
types that provide a low impedance path to ground at high
frequencies to handle transient currents due to internal logic
switching.
The power supply lines of the device should use as large a trace
as possible to provide low impedance paths and reduce the
effects of glitches on the power supply line. Fast switching
signals such as clocks should be shielded with digital ground
to avoid radiating noise to other parts of the board, and should
never be run near the reference inputs. Avoid crossover of
digital and analog signals. Traces on opposite sides of the board
should run at right angles to each other. This reduces the effects
of feedthrough through the board. A microstrip technique is by
far the best, but not always possible with a double-sided board.
In this technique, the component side of the board is dedicated to
the ground plane while signal traces are placed on the solder side.
AD780/REF192
WITH V
EXT
REF
GND
V
IN
DD
V
= 5V
OUT
Figure 47. Programmable Current Source
0.1µF
0.1µF
AD5330/AD5331/
AD5340/AD5341
V
REF
+
10µF
V
DD
GND
V
DD
= 5V
V
OUT
AD820/
OP295
5V
V
SOURCE
LOAD
4.7kΩ
470Ω

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