AD8401ARZ Analog Devices Inc, AD8401ARZ Datasheet

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AD8401ARZ

Manufacturer Part Number
AD8401ARZ
Description
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD8401ARZ

Converter Type
ADC/DAC
Resolution
8b
Digital Interface Type
Parallel
Pin Count
28
Package Type
SOIC W
Lead Free Status / Rohs Status
Compliant
a
GENERAL DESCRIPTION
The AD8401 is a complete data acquisition and control system
containing ADC, DAC, 4-channel MUX, and internal voltage
reference. Built using CBCMOS, this monolithic circuit offers
the user a complete system with very high package density and
reliability.
The converter is a successive approximation ADC with T/H,
and is capable of operating with conversion times as short as
2 s. Analog input bandwidth is 200 kHz, and DAC output volt-
age settling time is less than 4 s, making the AD8401 capable
of controlling servo loops with speed and precision.
The 8-bit data interface provides both read and write operation
for parallel bus interfaces to microcontrollers and DSP proces-
sors. An external 5 MHz clock sets the 2 s conversion rate.
Slower clocks reduce the conversion time and the internal power
dissipation. The standard control lines: Reset, Busy, Interrupt,
Read and Write complete the handshaking signals for micro-
processor communication. A start trigger ST input allows pre-
cise sampling intervals in synchronous sampling applications.
REV. 0
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.
FEATURES
2 s ADC with T/H
4-Channel MUX
AD899 Compatible
+5 Volt Operation
On-Chip Reference
4 s Voltage Output DAC
Fast Bus Access Time—75 ns
APPLICATIONS
Servo Controls
Digitally Controlled Calibration
Process Control Equipment
The input multiplexer addressing is designed for direct interface
to the AD899 hard-disk drive, read-channel device with no extra
hardware or special software. Analog input range levels are like-
wise compatible with the AD899.
The AD8401 is designed to operate from a single +5 volt sup-
ply, which will give an ADC input range of 0 V to 3.0 V, and
DAC output range of 0 V to 2.5 V.
The AD8401 is offered in the SOIC-28 surface mount package,
and is guaranteed to operate over the extended industrial tem-
perature range of –40 C to +85 C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
BUSY
V A
V B
V C
V D
I N
I N
I N
INT
IN
RS
ST
DGND
A0 A1
M
U
X
FUNCTIONAL BLOCK DIAGRAM
RD
T/H
CONTROL LOGIC
V
DD
8-Bit, 4-Channel Data
CLK CS
(+5.0V)
8-BIT ADC
Acquisition System
WR
1.25 REF
DATA I/O
DAC REG
ADC REG
(8 BITS)
8-BIT
DAC
AD8401
AG
AD8401
DAC
Fax: 617/326-8703
AG
ADC
V
OUT

Related parts for AD8401ARZ

AD8401ARZ Summary of contents

Page 1

FEATURES 2 s ADC with T/H 4-Channel MUX AD899 Compatible +5 Volt Operation On-Chip Reference 4 s Voltage Output DAC Fast Bus Access Time—75 ns APPLICATIONS Servo Controls Digitally Controlled Calibration Process Control Equipment GENERAL DESCRIPTION The AD8401 is ...

Page 2

AD8401–SPECIFICATIONS ADC ELECTRICAL CHARACTERISTICS Parameter Symbol STATIC PERFORMANCE Resolution N Total Unadjusted Error TUE Relative Accuracy INL Differential Nonlinearity DNL Offset Error V OSE Full-Scale Error A E Full-Scale DYNAMIC PERFORMANCE Signal-to-Noise Ratio SNR Total Harmonic Distortion THD ...

Page 3

DAC ELECTRICAL CHARACTERISTICS Parameter Symbol STATIC PERFORMANCE Resolution N Total Unadjusted Error TUE Relative Accuracy INL Differential Nonlinearity DNL Offset Error V Full-Scale Error A Full-Scale Load Regulation at Full-Scale DYNAMIC PERFORMANCE Signal-to-Noise Ratio SNR Total Harmonic Distortion ...

Page 4

AD8401 TIMING ELECTRICAL SPECIFICATIONS Parameters DAC TIMING (See Figure 8 Timing Diagram) WR Pulse Width Setup Time Hold Time Data Setup Time Data Hold Time ADC TIMING (See Figures 6 and ...

Page 5

PIN CONFIGURATION DAC 3 V OUT DB7 AD8401AR Top View 8 DB6 (Not to Scale) 9 DB5 10 DB4 11 DB3 12 DB2 13 DGND DB1 14 NC ...

Page 6

AD8401 OPERATION The AD8401 is a complete data acquisition and control system. It contains the DAC, a four channel input multiplexer, a track/ hold, an ADC, as well as an internal bandgap reference. It inter- faces to the microcontroller via ...

Page 7

CLOCK The AD8401 uses an external clock that is TTL CMOS compatible. The external clock speed is 5 MHz and the duty cycle may vary from 30% to 70%. The external clock can be continuously operated between ...

Page 8

AD8401 An active low pulse, at any time, on the RESET pin asynchro- nously forces all DAC register bits to zero. The DAC output voltage becomes zero volts and stays at that value until a new data word is loaded ...

Page 9

FULL SCALE ERROR – LSB Figure 14. DAC Full-Scale Error Histogram 3.0 2.5 2.0 1 –0.5 ...

Page 10

AD8401 500mV 100 + + 1000pF TIME – /DIV Figure 20. DAC Output Swing with Capacitive Load Figure 22. Power Supply Rejection Ratio vs. Frequency ...

Page 11

APPLICATIONS INFORMATION The software programming needs to format data as defined by the transfer equations and Code Tables that follow. DAC Transfer Equation D 255 for a 2.50 V full scale V 2.500 2.500 OUT 256 256 where D is ...

Page 12

AD8401 ADDRESS BUS AD899 Figure 24. AD8401 Interface to the AD899 Read-Channel Hard Disk Drive Circuit 0.0118 (0.30) 0.0040 (0.10) V (+5.0V AD8401 ...

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