AD5453YUJ-REEL7 Analog Devices Inc, AD5453YUJ-REEL7 Datasheet - Page 16
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AD5453YUJ-REEL7
Manufacturer Part Number
AD5453YUJ-REEL7
Description
IC DAC 14BIT MULT TSOT23-8
Manufacturer
Analog Devices Inc
Datasheet
1.AD5451YUJ-REEL.pdf
(28 pages)
Specifications of AD5453YUJ-REEL7
Design Resources
Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) Precision, Bipolar, Configuration for AD5450/1/2/3 8-14bit Multiplying DACs (CN0053) AC Signal Processing Using AD5450/1/2/3 Current Output DACs (CN0054) Programmable Gain Element Using AD5450/1/2/3 Current Output DAC Family (CN0055)
Settling Time
180ns
Number Of Bits
14
Data Interface
Serial
Number Of Converters
1
Voltage Supply Source
Single Supply
Power Dissipation (max)
55µW
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TSOT-23-8, TSOT-8
For Use With
EVAL-AD5453EB - BOARD EVAL FOR AD5453
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
AD5450/AD5451/AD5452/AD5453
GENERAL DESCRIPTION
DAC SECTION
The AD5450/AD5451/AD5452/AD5453 are 8-/10-/12-/14-bit
current output DACs, respectively, consisting of a segmented
(4-bit) inverting R-2R ladder configuration. A simplified
diagram for the 12-bit AD5452 is shown in Figure 42.
The feedback resistor, R
typically 9 kΩ (with a minimum value of 7 kΩ and a maximum
value of 11 kΩ). If I
constant current flows in each ladder leg, regardless of digital
input code. Therefore, the input resistance presented at V
always constant and nominally of value R. The DAC output
(I
capacitances. When choosing the external amplifier, take into
account the variation in impedance generated by the DAC on
the amplifier’s inverting input node.
Access is provided to the V
DAC, making the device extremely versatile and allowing it to be
configured in several operating modes; for example, it can provide
a unipolar output or can provide 4-quadrant multiplication in
bipolar mode. Note that a matching switch is used in series with
the internal R
R
CIRCUIT OPERATION
Unipolar Mode
Using a single op amp, these devices can easily be configured to
provide a 2-quadrant multiplying operation or a unipolar output
voltage swing, as shown in Figure 43. When an output amplifier
is connected in unipolar mode, the output voltage is given by
where:
D is the fractional representation of the digital word loaded to
the DAC.
D
n is the number of bits.
FB
OUT
, power must be applied to V
1) is code-dependent, producing various resistances and
= 0 to 255 (8-bit AD5450).
= 0 to 1023 (10-bit AD5451).
= 0 to 4095 (12-bit AD5452).
= 0 to 16,383 (14-bit AD5453).
V
V
REF
OUT
=
−
FB
2R
S1
2
D
feedback resistor. If users attempt to measure
R
n
Figure 42. AD5452 Simplified Ladder
DAC DATA LATCHES
×
OUT
AND DRIVERS
V
2R
S2
REF
1 is kept at the same potential as GND, a
R
FB
, has a value of R. The value of R is
REF
2R
S3
, R
DD
FB
to achieve continuity.
R
, and I
2R
S12
OUT
1 terminals of the
2R
R
AGND
R
I
OUT
FB
REF
1
is
Rev. B | Page 16 of 28
Note that the output voltage polarity is opposite to the V
polarity for dc reference voltages.
V
NOTES
1. R1 AND R2 USED ONLY IF GAIN ADJUSTMENT IS REQUIRED.
2. C1 PHASE COMPENSATION (1pF TO 2pF) MAY BE REQUIRED
These DACs are designed to operate with either negative or
positive reference voltages. The V
the internal digital logic to drive the on and off states of the
DAC switches.
These DACs are designed to accommodate ac reference input
signals in the range of −10 V to +10 V.
With a fixed 10 V reference, the circuit shown in Figure 43 gives
a unipolar 0 V to −10 V output voltage swing. When V
signal, the circuit performs 2-quadrant multiplication.
Table 5 shows the relationship between the digital code and
the expected output voltage for a unipolar operation using the
8-bit AD5450.
Table 5. Unipolar Code Table for the AD5450
Digital Input
1111 1111
1000 0000
0000 0001
0000 0000
REF
IF A1 IS A HIGH SPEED AMPLIFIER.
R1
V
SYNC
REF
V
V
µCONTROLLER
DD
DD
Figure 43. Unipolar Mode Operation
AD5450/
AD5451/
AD5452/
AD5453
SCLK SDIN
Analog Output (V)
−V
−V
−V
−V
REF
REF
REF
REF
R
(255/256)
(128/256) = −V
(1/256)
(0/256) = 0
FB
I
OUT
GND
DD
R2
1
power pin is only used by
AGND
REF
C1
/2
A1
V
OUT
= 0 TO –V
IN
REF
is an ac
REF