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Analog Devices Semiconductor Electronic Components Datasheet

AD8401 Datasheet

8-Bit/ 4-Channel Data Acquisition System

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a
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
8-Bit, 4-Channel Data
Acquisition System
AD8401
FUNCTIONAL BLOCK DIAGRAM
A0 A1 VDD (+5.0V)
VI NA
VINB
VI NC
VI ND
RS
INT
BUSY
ST
M
U T/H
X
8-BIT ADC
8-BIT
DAC
1.25 REF
VOUT
CONTROL LOGIC
DAC REG
ADC REG
AD8401
DGND RD CLK CS WR DATA I/O
(8 BITS)
AGDAC AGADC
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 µs. Analog input bandwidth is 200 kHz, and DAC output volt-
age settling time is less than 4 µs, 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 µs 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.
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD8401 Datasheet

8-Bit/ 4-Channel Data Acquisition System

No Preview Available !

AD8401–SPECIFICATIONS
ADC ELECTRICAL CHARACTERISTICS (@ VDD = +5.0 V ؎ 5%, AGDAC = AGADC = 0.0 V; fCLK = 5 MHz; –40؇C TA +85؇C,
unless otherwise noted)
Parameter
Symbol
Conditions
Min
STATIC PERFORMANCE
Resolution
Total Unadjusted Error
Relative Accuracy
Differential Nonlinearity
Offset Error
N
TUE
INL
DNL
VOSE
Full-Scale Error
AE
Full-Scale/VDD
DYNAMIC PERFORMANCE
Signal-to-Noise Ratio
Total Harmonic Distortion
Intermodulation Distortion
Frequency Response
Track/Hold Acquisition Time
SNR
THD
IMD
tAQ
ANALOG INPUTS (Applies to Inputs A, B. C, D)
Unipolar Input Range
Input Current
Input Capacitance
VIN
IIN
CIN
TA = +25°C
TA = Full Temp Range
TA = +25°C
TA = Full Temp Range
TA = +25°C
0 to 200 kHz
8
–1
–1
–4
–6
–4
–6
0
–500
LOGIC INPUTS
Clock Input Current Low
Clock Input Current High
Input Leakage Current
ICKL
ICKH
IL
VIN = 0 V
VIN = VDD
CS, RD, RS, ST
1.6
LOGIC OUTPUTS (Applies to Outputs DB0–DB7, INT, BUSY)
Logic Output Low Voltage
Logic Output High Voltage
Output Leakage Current
Output Capacitance
VOL
VOH
IOZ
COZ
IOL = 1.6 mA
IOH = 200 µA
CS = 1 (Except INT & BUSY)
CS = 1 (Except INT & BUSY)
4.0
CONVERSION TIME
tC
External Clock
Specifications subject to change without notice.
Typ
±3
44
48
60
0.1
200
10
Max
+1
+1
+4
+6
+4
+6
1
3
+500
40
10
0.4
10
10
2
Units
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
dB
dB
dB
dB
ns
V
µA
pF
mA
µA
µA
V
V
µA
pF
µs
Table I. Multiplexer Address Input Decode
A1 A0 Input Selected
0 0 VINA
0 1 VINB
1 0 VINC
1 1 VIND
–2– REV. 0


Part Number AD8401
Description 8-Bit/ 4-Channel Data Acquisition System
Maker Analog Devices
Total Page 12 Pages
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