ad7397anz Analog Devices, Inc., ad7397anz Datasheet

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ad7397anz

Manufacturer Part Number
ad7397anz
Description
3 V, Parallel Input Dual 12-bit /10-bit Dacs
Manufacturer
Analog Devices, Inc.
Datasheet
a
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.
GENERAL DESCRIPTION
The AD7396/AD7397 series of dual, 12-bit and 10-bit voltage-
output digital-to-analog converters are designed to operate from
a single +3 V supply. Built using a CBCMOS process, these
monolithic DACs offer the user low cost and ease of use in
single supply +3 V systems. Operation is guaranteed over the
supply voltage range of +2.7 V to +5.5 V, making this device
ideal for battery operated applications.
A 12-bit wide data latch loads with a 45 ns write time allowing
interface to fast processors without wait states. The double
buffered input structure allows the user to load the input
registers one at a time, then a single load strobe tied to both
LDA+LDB inputs will simultaneously update both DAC out-
puts. LDA and LDB can also be independently activated to
immediately update their respective DAC registers. An address
input (A/B) decodes DACA or DACB when the chip select CS
input is strobed. Additionally, an asynchronous RS input sets
the output to zero-scale at power on or upon user demand.
Power shutdown to submicroamp levels is directly controlled by
the active low SHDN pin. While in the power shutdown state
register data can still be changed even though the output buffer
is in an open circuit state. Upon return to the normal operating
state the latest data loaded in the DAC register will establish the
output voltage.
FEATURES
Micropower: 100 A/DAC
0.1 A Typical Power Shutdown
Single Supply +2.7 V to +5.5 V Operation
Compact 1.1 mm Height TSSOP 24-Lead Package
AD7396: 12-Bit Resolution
AD7397: 10-Bit Resolution
0.9 LSB Differential Nonlinearity Error
APPLICATIONS
Automotive Output Span Voltage
Portable Communications
Digitally Controlled Calibration
PC Peripherals
Both parts are offered in the same pinout, allowing users to
select the amount of resolution appropriate for their applications
without circuit card changes.
The AD7396/AD7397 are specified for operation over the ex-
tended industrial (–40 C to +85 C) temperature range. The
AD7397AR is specified for the –40 C to +125 C automotive
temperature range. AD7396/AD7397s are available in plastic
DIP, and 24-lead SOIC packages. The AD7397ARU is avail-
able for ultracompact applications in a thin 1.1 mm height
TSSOP 24-lead package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
DATA
LDA
LDB
A/B
CS
Figure 1. DNL vs. Digital Code at Temperature
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
0.0
AD7396
0
12
DGND
FUNCTIONAL BLOCK DIAGRAM
512
Dual 12-Bit /10-Bit DACs
1024
World Wide Web Site: http://www.analog.com
REGISTER
REGISTER
REGISTER
REGISTER
INPUTA
INPUTB
DACA
DACB
T
A
1536
= +25 C, +85 C, –55 C
CODE – Decimal
AD7396/AD7397
SUPERIMPOSED
3 V, Parallel Input
2048
RS
1
12
12
2560
© Analog Devices, Inc., 1998
12-BIT
12-BIT
DACA
DACB
3072
V
V
DD
REF
= +3V
= +2.5V
3584
SHDN
4096
V
V
V
V
AGND
DD
OUTA
REF
OUTB

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ad7397anz Summary of contents

Page 1

... Figure 1. DNL vs. Digital Code at Temperature One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 V DD 12-BIT V OUTA DACA V REF 12-BIT V OUTB DACB AGND SHDN +2.5V REF 2560 3072 3584 4096 © Analog Devices, Inc., 1998 ...

Page 2

AD7396/AD7397–SPECIFICATIONS AD7396 12-BIT ELECTRICAL CHARACTERISTICS Parameter STATIC PERFORMANCE 1 Resolution 2 Relative Accuracy 2 Relative Accuracy 2 Differential Nonlinearity 2 Differential Nonlinearity Zero-Scale Error Zero-Scale Error Full-Scale Voltage Error Full-Scale Voltage Error 3 Full-Scale Tempco REFERENCE INPUT V Range REF ...

Page 3

AD7397 10-BIT ELECTRICAL CHARACTERISTICS Parameter Symbol STATIC PERFORMANCE 1 Resolution N 2 Relative Accuracy INL 2 Relative Accuracy INL 2 Differential Nonlinearity DNL Zero-Scale Error V ZSE Full-Scale Voltage Error V FSE Full-Scale Voltage Error V FSE 3 Full-Scale Tempco ...

Page 4

AD7396/AD7397 t CSW A D0–D11 LDA, LDB t RSW OUT Figure 2. Timing Diagram CS LDA LDB RS A ...

Page 5

ABSOLUTE MAXIMUM RATINGS GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0 ...

Page 6

AD7396/AD7397 Pin No. Name 1 V OUTA 2 AGND 3 DGND LDA 4 SHDN 7–18 D0–D11 9–18 D0– A/B LDB REF 24 V OUTB V ...

Page 7

V = +3V AD7396 +2.5V REF T = –55 C 1.0 A 0.5 0.0 –0 + –1.0 –1.5 0 512 1024 1536 2048 2560 3072 3584 4096 CODE – Decimal ...

Page 8

AD7396/AD7397 0 –5 – +3V DD –15 CODE = FULL SCALE –20 –25 –30 –35 –40 –45 –50 100 1k 10k 100k 1M FREQUENCY – Hz Figure 13. Reference Multiplying Gain vs. Frequency 5 +25 C ...

Page 9

AD7396 1200 +2.7V, CODE = 555 +2.7V, CODE = 3FF 1000 +5.5V, CODE = 155 +5.5V, CODE = 3FF DD H ...

Page 10

AD7396/AD7397 The rail-to-rail output stage provides output current. The N-channel output pull-down MOSFET shown in Figure 26 has resistance, which sets the sink current capability near ground. In addition to resistive load driving capability, ...

Page 11

Input Register data updates to directly control the DAC output voltages for single-buffered applications. For doubled-buffered applications where both DAC outputs, V and V , need to be changed simultaneously to a new value, OUTB the two ...

Page 12

AD7396/AD7397 I < 262 A SY +5V 470k 470k 200 A V REF DD OP196 V AD7397 C OUTA GND ONLY ONE CHANNEL SHOWN. DIGITAL INTERFACE CIRCUITRY OMITTED FOR CLARITY. Figure 30. Bipolar Output Operation 24-Lead SOIC Package (R-24) 0.6141 ...

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