Home >> AD5555 Search >> Analog Devices AD5555 Datasheet

AD5555 Datasheet

16-/14-Bit DACs

No Preview Available !

AD5555 pdf
AD5545/AD5555
APPLICATIONS INFORMATION
STABILITY
VDD
U1
VDD
RFB
C1
VREF
VREF
GND
IOUT
AD8628
VO
AD5545/AD5555 U2
02918-0-020
Figure 21. Operational Compensation Capacitor for Gain Peaking
Prevention
In the I-to-V configuration, the IOUT of the DAC and the
inverting node of the op amp must be connected as close as
possible, and proper PCB layout techniques must be employed.
Because every code change corresponds to a step function, gain
peaking may occur if the op amp has limited GBP, and if there
is excessive parasitic capacitance at the inverting node.
An optional compensation capacitor, C1, can be added for
stability as shown in Figure 21. C1 should be found empirically,
but 6 pF is generally more than adequate for the compensation.
Data Sheet
BIPOLAR OUTPUT
The AD5545/AD5555 is inherently a 2-quadrant multiplying
DAC. It can easily be set up for unipolar output operation. The
full-scale output polarity is the inverse of the reference input
voltage.
In some applications, it may be necessary to generate the full
4-quadrant multiplying capability or a bipolar output swing. This
is easily accomplished by using an additional external amplifier,
U4, configured as a summing amplifier (see Figure 22). In this
circuit, the second amplifier, U4, provides a gain of 2, which
increases the output span magnitude to 5 V. Biasing the external
amplifier with a 2.5 V offset from the reference voltage results in a
full 4-quadrant multiplying circuit. The transfer equation of this
circuit shows that both negative and positive output voltages are
created because the input data (D) is incremented from code zero
(VOUT = −2.5 V) to midscale (VOUT = 0 V) to full scale (VOUT =
+2.5 V).
VOUT = (D/32,768 − 1) × VREF (AD5545)
(3)
VOUT = (D/8192 − 1) × VREF (AD5555)
(4)
For the AD5545, the external resistance tolerance becomes the
dominant error that users should be aware of.
R1 R2
10kΩ±0.01% 10kΩ±0.01%
C2
+5V
ADR03
5V VOUT VIN
GND
U3
U1
VDD RFB
VREF
GND
C1
IOUT
5kΩ±0.01%
R3
U4 +5V
1/2 V+
AD8620
V–
VO
1/2
AD8620
–5V
–2.5 < VO < +2.5
AD5545/AD5555 U2
02918-0-022
Figure 22. Four-Quadrant Multiplying Application Circuit
Rev. I | Page 12 of 23
Analog Devices
Analog Devices


PDF Click to Download PDF File

PDF View for Mobile




Related Start with AD555*

[ AD5551 Analog Devices ]     [ AD5552 Analog Devices ]     [ AD5553 Analog Devices ]     [ AD5554 Analog Devices ]     [ AD5555 Analog Devices ]     [ AD5556 Analog Devices ]     [ AD5557 Analog Devices ]     [ AD5501 Analog Devices ]     [ AD5504 Analog Devices ]     [ AD5512A Analog Devices ]     [ AD5516 Analog Devices ]     [ AD5520 Analog Devices ]     [ AD5522 Analog Devices ]     [ AD5530 Analog Devices ]     [ AD5531 Analog Devices ]     [ AD5532 Analog Devices ]     [ AD5532B Analog Devices ]    


Searches related to AD5555 part

Find Chips CBC RS online RUTRONIK 24
Component Distributors NexGen Digital Richardson RFPD ICC
Beyond Components NAC PEI-Genesis Powell Electronics
TME Ameya 360 Power & Signal Datasheets360
Freelance Electronics Sager Electronics Terminals & Connectors TTI

0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z
@ 2014 :: DatasheetsPDF.com :: Semiconductors Datasheet Search & Download Site