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AD7228 데이터시트 PDF




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부품번호 AD7228 기능
기능 LC2MOS Octal 8-Bit DAC
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AD7228 데이터시트, 핀배열, 회로
Data Sheet
FEATURES
Eight 8-bit DACs with output amplifiers
Operates with single or dual supplies
Microprocessor-compatible (95 ns WR pulse)
No user trims required
Skinny 24-lead PDIP, CERDIP, and SOIC packages, and a
28-lead PLCC surface-mount package
GENERAL DESCRIPTION
The AD7228 contains eight 8-bit voltage mode digital-to- analog
converters (DACs), with output buffer amplifiers and interface
logic on a single monolithic chip. No external trims are required
to achieve the full specified performance for the device.
Separate on-chip latches are provided for each of the eight DACs.
Data is transferred into the data latches through a common
8-bit, TTL/CMOS-compatible input port (5 V). The A0, A1,
and A2 address inputs determine which latch is loaded when
WR goes low. The control logic is speed compatible with most
8-bit microprocessors.
Specified performance is guaranteed for input reference voltages
from 2 V to 10 V when using dual supplies. The device is also
specified for single-supply operation using a reference of 10 V.
Each output buffer amplifier is capable of developing 10 V across a
2 kΩ load.
The AD7228 is fabricated on an all ion implanted, high speed,
linear-compatible CMOS (LC2MOS) process, specifically
Rev. C
Document Feedback
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
LC2MOS Octal 8-Bit DAC
AD7228
FUNCTIONAL BLOCK DIAGRAM
VREF
VDD
11 1
LATCH 1
DAC 1
1 9 VOUT1
LATCH 2
DAC 2
2 8 VOUT2
LATCH 3
DAC 3
3 7 VOUT3
MSB 13
DATA
(8-BIT)
LSB 20
LATCH 4
LATCH 5
DAC 4
DAC 5
4 6 VOUT4
5 5 VOUT5
LATCH 6
DAC 6
6 4 VOUT6
LATCH 7
DAC 7
7 3 VOUT7
LATCH 8
DAC 8
8 2 VOUT8
WR 21
A2 22
A1 23
A0 24
CONTROL
LOGIC
AD7228
10
VSS
Figure 1.
12
GND
developed to integrate high speed digital logic circuits and
precision analog circuits on the same chip.
PRODUCT HIGHLIGHTS
1. The single chip design of eight 8-bit DACs and amplifiers
allows a dramatic reduction in board space requirements
and offers increased reliability in systems using multiple
converters. The PDIP, CERDIP, and SOIC pinout is aimed at
optimizing board layout with all analog inputs and outputs at
one side of the package and all digital inputs at the other.
2. The voltage mode configuration of the DACs allows single
supply operation of the AD7228. The device can also be
operated with dual supplies giving enhanced performance
for some parameters.
3. The AD7228 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 and speed compatible with most high
performance 8-bit microprocessors.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1992–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com




AD7228 pdf, 반도체, 판매, 대치품
Data Sheet
AD7228
SPECIFICATIONS
DUAL SUPPLY
VDD = 10.8 V to 16.5 V, VSS = −5 V ± 10%, GND = 0 V, VREF = 2 V to 10 V, RL = 2 kΩ, CL = 100 pF, unless otherwise noted. All
specifications TMIN to TMAX, −40°C to +85°C unless otherwise noted. VOUT must be less than VDD by 3.5 V to ensure correct operation.
Table 1.
Parameter
STATIC PERFORMANCE
Resolution
Total Unadjusted Error (TUE)1
Relative Accuracy
Differential Nonlinearity
Full-Scale Error2
Zero Code Error
at 25°C
TMIN to TMAX
Minimum Load Resistance
REFERENCE INPUT
Voltage Range
Input Resistance
Input Capacitance3
AC Feedthrough
DIGITAL INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Leakage Current
Input Capacitance3
Input Coding
DYNAMIC PERFORMANCE3
Voltage Output Slew Rate
Voltage Output Settling Time
Positive Full-Scale Change
Negative Full-Scale Change
Digital Feedthrough
Digital Crosstalk4
POWER SUPPLIES
VDD Range
VSS Range
IDD
at 25°C
TMIN to TMAX
ISS
at 25°C
TMIN to TMAX
K and B
Versions
8
±2
±1
±1
±1
±25
±30
2
2/10
2
500
−70
2.4
0.8
±1
8
Binary
2
5
5
50
50
10.8/16.5
−4.5/−5.5
16
20
14
18
L and C
Versions
8
±1
±1/2
±1
±1/2
±15
±20
2
2/10
2
500
−70
2.4
0.8
±1
8
Binary
2
5
5
50
50
10.8/16.5
−4.5/−5.5
16
20
14
18
Unit Test Conditions/Comments
Bits
LSB max
LSB max
LSB max
LSB max
VDD = 15 V ± 10%, VREF = 10 V
Guaranteed monotonic
Typical temperature coefficient is 5 ppm/°C with
VREF = 10 V
mV max
mV max
kΩ min
Typical temperature coefficient is 30 μV/°C
VOUT = 10 V
V min/V max
kΩ min
pF max
dB typ
Occurs when each DAC is loaded with all 1s
VREF = 8 V p-p sine wave at 10 kHz
V min
V max
μA max
pF max
VIN = 0 V or VDD
V/μs min
μs max
μs max
nV-sec typ
nV-sec typ
VREF = 10 V; settling time to ±1/2 LSB
VREF = 10 V; settling time to ±1/2 LSB
Code transition all 0s to all 1s, VREF = 0 V; WR = VDD
Code transition all 0s to all 1s, VREF = 10 V; WR = 0 V
V min/V max
V min/V max
mA max
mA max
mA max
mA max
For specified performance
For specified performance
Outputs unloaded; VIN = VINL or VINH
Outputs unloaded; VIN = VINL or VINH
1 Total unadjusted error includes zero code error, relative accuracy, and full-scale error.
2 Calculated after zero code error is adjusted out.
3 Sample tested at TA = 25°C to ensure compliance.
4 The glitch impulse transferred to the output of one converter (not addressed) due to a change in the digital input code to another addressed converter.
Rev. C | Page 3 of 15

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AD7228 전자부품, 판매, 대치품
AD7228
ABSOLUTE MAXIMUM RATINGS
Table 4.
Parameter
VDD to GND
VDD to VSS
Digital Input Voltage to GND
VREF to GND
VOUTx to GND1
Power Dissipation (Any Package) to 75°C
Derates Above 75°C by
Operating Temperature Range
Commercial
Industrial
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
Rating
−0.3 V to +17 V
−0.3 V to +24 V
−0.3 V to VDD
−0.3 V to VDD
VSS, VDD
1000 mW
2.0 mW/°C
−40°C to +85°C
−40°C to +85°C
−65°C to +150°C
300°C
1 Outputs can be shorted to any voltage in the range VSS to VDD provided that
the power dissipation of the package is not exceeded. Typical short-circuit
current fora short to GND or VSS is 50 mA.
Data Sheet
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
ESD CAUTION
Rev. C | Page 6 of 15

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