AD7226 Analog Devices, AD7226 Datasheet

no-image

AD7226

Manufacturer Part Number
AD7226
Description
LC2MOS Quad 8-Bit D/A Converter
Manufacturer
Analog Devices
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD7226BE
Manufacturer:
a
Quantity:
63
Part Number:
AD7226BQ
Manufacturer:
AD
Quantity:
2
Part Number:
AD7226BQ
Manufacturer:
elisra
Quantity:
47
Part Number:
AD7226BQ
Manufacturer:
ADI
Quantity:
431
Part Number:
AD7226BRS
Manufacturer:
ADI
Quantity:
534
Part Number:
AD7226BRSZ
Manufacturer:
ADI
Quantity:
534
Part Number:
AD7226BRSZ
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD7226FR
Manufacturer:
AD
Quantity:
22
Part Number:
AD7226FS
Manufacturer:
ADI/亚德诺
Quantity:
20 000
Part Number:
AD7226JD
Manufacturer:
ADI
Quantity:
316
Part Number:
AD7226KCWP
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
AD7226KN
Manufacturer:
AD
Quantity:
500
Part Number:
AD7226KN
Manufacturer:
AD
Quantity:
7
a
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
GENERAL DESCRIPTION
The AD7226 contains four 8-bit voltage-output digital-to-
analog converters, with output buffer amplifiers and interface
logic on a single monolithic chip. No external trims are required
to achieve full specified performance for the part.
Separate on-chip latches are provided for each of the four D/A
converters. Data is transferred into one of these data latches
through a common 8-bit TTL/CMOS (5 V) compatible input
port. Control inputs A0 and A1 determine which DAC is loaded
when WR goes low. The control logic is speed-compatible with
most 8-bit microprocessors.
Each D/A converter includes an output buffer amplifier capable
of driving up to 5 mA of output current. The amplifiers’ offsets
are laser-trimmed during manufacture, thereby eliminating any
requirement for offset nulling.
Specified performance is guaranteed for input reference voltages
from +2 V to +12.5 V with dual supplies. The part is also speci-
fied for single supply operation at a reference of +10 V.
The AD7226 is fabricated in an all ion-implanted high speed
Linear Compatible CMOS (LC
specifically developed to allow high speed digital logic circuits
and precision analog circuits to be integrated on the same chip.
FEATURES
Four 8-Bit DACs with Output Amplifiers
Skinny 20-Pin DIP, SOIC and 20-Terminal
Microprocessor Compatible
TTL/CMOS Compatible
No User Trims
Extended Temperature Range Operation
Single Supply Operation Possible
APPLICATIONS
Process Control
Automatic Test Equipment
Automatic Calibration of Large System Parameters,
Surface Mount Packages
e.g., Gain/Offset
2
MOS) process which has been
PRODUCT HIGHLIGHTS
1. DAC-to-DAC Matching
2. Single Supply Operation
3. Microprocessor Compatibility
4. Small Size
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Since all four DACs are fabricated on the same chip at the
same time, precise matching and tracking between the DACs
is inherent.
The voltage mode configuration of the DACs allows the
AD7226 to be operated from a single power supply rail.
The AD7226 has a common 8-bit data bus with individual
DAC latches, providing a versatile control architecture for
simple interface to microprocessors. All latch enable signals
are level triggered.
Combining four DACs and four op amps plus interface logic
into a 20-pin DIP or SOIC or a 20-terminal surface mount
package allows a dramatic reduction in board space require-
ments and offers increased reliability in systems using mul-
tiple converters. Its pinout is aimed at optimizing board
layout with all the analog inputs and outputs at one end of the
package and all the digital inputs at the other.
Quad 8-Bit D/A Converter
FUNCTIONAL BLOCK DIAGRAM
AD7226
Fax: 617/326-8703
LC
2
MOS

Related parts for AD7226

AD7226 Summary of contents

Page 1

... The voltage mode configuration of the DACs allows the AD7226 to be operated from a single power supply rail. 3. Microprocessor Compatibility The AD7226 has a common 8-bit data bus with individual DAC latches, providing a versatile control architecture for simple interface to microprocessors. All latch enable signals are level triggered ...

Page 2

... AD7226–SPECIFICATIONS ( DUAL SUPPLY All specifications T Parameter STATIC PERFORMANCE Resolution Total Unadjusted Error Relative Accuracy Differential Nonlinearity Full Scale Error Full Scale Temperature Coefficient Zero Code Error Zero Code Error Temperature Coefficient REFERENCE INPUT Voltage Range Input Resistance ...

Page 3

... Specifications subject to change without notice. Model AD7226KN AD7226KP AD7226KR AD7226BQ AD7226TQ AD7226TE NOTES 1 To order MIL-STD-883, Class B processed parts, add /883B to part number. Contact your local sales office for Military data sheet, for U.S. Standard Military Drawing (SMD), see DESC drawing #5962–87802 Leadless Ceramic Chip Carrier ...

Page 4

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7226 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 5

... The output voltages from the con- verters have the same polarity as the reference voltage allowing single supply operation. A novel DAC switch pair arrangement on the AD7226 allows a reference voltage range from + +12.5 V. Each DAC consists of a highly stable, thin-film, R-2R ladder and eight high speed NMOS, single-pole, double-throw switches ...

Page 6

... The data is latched into the addressed DAC latch on the rising edge of WR. While WR is high the analog outputs remain at the value corresponding to the data held in their respective latches. Table I. AD7226 Truth Table AD7226 Control Inputs AD7226 WR A1 ...

Page 7

... AGND and DGND are . SS equal is to tie AGND and DGND together at the AD7226. In more complex systems where the AGND and DGND intertie is on the backplane recommended that two diodes be con- nected in inverse parallel between the AD7226 AGND and DGND pins (IN914 or equivalent). – ...

Page 8

... Mismatch between R1 and R2 causes gain and offset errors and therefore these resistors must match and track over temperature. Once again the AD7226 can be operated in single supply or from positive/negative supplies. Table III shows the digital code versus output voltage relationship for the circuit of Figure 13 with ...

Page 9

... Figure 17 shows typical resulting waveforms. The sine waves can be smoothed by filtering the D/A converter outputs. The fourth D/A converter of the AD7226, DAC D, may be used in a feedback configuration to provide a programmable refer- ence voltage for itself and the other three converters. This con- figuration is shown in Figure 15 ...

Page 10

... The upper and lower limits are those required by the AD7226 to achieve its lin- earity specification. Figure 20 shows a sine wave signal applied to the reference input of the AD7226. For input signal frequen- cies kHz the output distortion typically remains less than 0 ...

Page 11

... Figure 21 shows how the AD7226 can be used to provide pro- grammable input offset voltage adjustment for the AD544 op amp. Each output of the AD7226 can be used to trim the input offset voltage on one AD544. The 620 k resistor tied to +10 V provides a fixed bias current to one offset node. For symmetrical adjustment, this bias current should equal the current in the other offset node with the half-full scale code (i ...

Page 12

... AD7226 20-Pin Plastic (N-20) 20-Pin Cerdip (Q-20) 20-Pin SOIC (R-20) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Terminal Plastic Leaded Chip Carrier (P-20A) 20-Terminal Leadless Ceramic Chip Carrier (E-20A) –12– REV. A ...

Related keywords