AD7537KR-REEL Analog Devices Inc, AD7537KR-REEL Datasheet

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AD7537KR-REEL

Manufacturer Part Number
AD7537KR-REEL
Description
IC DAC 12BIT DUAL MULT 24-SOIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD7537KR-REEL

Rohs Status
RoHS non-compliant
Settling Time
250µs
Number Of Bits
12
Data Interface
Parallel
Number Of Converters
2
Voltage Supply Source
Single Supply
Power Dissipation (max)
24mW
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
24-SOIC (7.5mm Width)
a
GENERAL DESCRIPTION
The AD7537 contains two 12-bit current output DACs on one
monolithic chip. A separate reference input is provided for each
DAC. The dual DAC saves valuable board space, and the
monolithic construction ensures excellent thermal tracking.
Both DACs are guaranteed 12-bit monotonic over the full tem-
perature range.
The AD7537 has a 2-byte (8 LSBs, 4 MSBs) loading structure.
It is designed for right-justified data format. The control signals
for register loading are A0, A1, CS, WR and UPD. Data is
loaded to the input registers when CS and WR are low. To
transfer this data to the DAC registers, UPD must be taken low
with WR.
Added features on the AD7537 include an asynchronous CLR
line which is very useful in calibration routines. When this is
taken low, all registers are cleared. The double buffering of the
data inputs allows simultaneous update of both DACs. Also,
each DAC has a separate AGND line. This increases the device
versatility; for instance one DAC may be operated with
AGND biased while the other is connected in the standard
configuration.
The AD7537 is manufactured using the Linear Compatible
CMOS (LC
microprocessors and accepts TTL, 74HC and 5 V CMOS logic
level inputs.
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
Two 12-Bit DACs in One Package
DAC Ladder Resistance Matching: 0.5%
Space Saving Skinny DIP and Surface Mount Packages
4-Quadrant Multiplication
Low Gain Error (1 LSB max Over Temperature)
Byte Loading Structure
Fast Interface Timing
APPLICATIONS
Automatic Test Equipment
Programmable Filters
Audio Applications
Synchro Applications
Process Control
2
MOS) process. It is speed compatible with most
PRODUCT HIGHLIGHTS
1. DAC to DAC Matching:
2. Small Package Size:
3. Wide Power Supply Tolerance:
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
(8+4) Loading Dual 12-Bit DAC
Since both DACs are fabricated on the same chip, precise
matching and tracking is inherent. Many applications which
are not practical using two discrete DACs are now possible.
Typical matching: 0.5%.
The AD7537 is packaged in small 24-pin 0.3" DIPs and in
28-terminal surface mount packages.
The device operates on a +12 V to +15 V V
tolerance on this nominal figure. All specifications are
guaranteed over this range.
FUNCTIONAL BLOCK DIAGRAM
AD7537
DD
Fax: 617/326-8703
LC
, with 10%
2
MOS

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AD7537KR-REEL Summary of contents

Page 1

FEATURES Two 12-Bit DACs in One Package DAC Ladder Resistance Matching: 0.5% Space Saving Skinny DIP and Surface Mount Packages 4-Quadrant Multiplication Low Gain Error (1 LSB max Over Temperature) Byte Loading Structure Fast Interface Timing APPLICATIONS Automatic Test ...

Page 2

AD7537–SPECIFICATIONS J, A Parameter Versions ACCURACY Resolution 12 Relative Accuracy 1 Differential Nonlinearity 1 Gain Error 6 2 Gain Temperature Coefficient ; Gain/ Temperature 5 Output Leakage Current I OUTA + 150 MIN MAX I ...

Page 3

TIMING CHARACTERISTICS Limit at Limit Parameter ...

Page 4

AD7537 PIN FUNCTION DESCRIPTION (DIP) PIN MNEMONIC DESCRIPTION 1 AGNDA Analog Ground for DAC Current output terminal of DAC A. OUTA 3 R Feedback resistor for DAC A. FBA 4 V Reference input to DAC A. REFA ...

Page 5

UNIPOLAR BINARY OPERATION (2-QUADRANT MULTIPLICATION) Figure 4 shows the circuit diagram for unipolar binary opera- tion. With an ac input, the circuit performs 2-quadrant multipli- cation. The code table for Figure 4 is given in Table II. Operational amplifiers A1 ...

Page 6

AD7537 SEPARATE AGND PINS The DACs in the AD7537 have separate AGND lines taken to pins AGNDA and AGNDB on the package. This increases the applications versatility of the part. Figure example of this. DAC A is ...

Page 7

APPLICATION HINTS Output Offset: CMOS D/A converters in circuits such as Fig- ures 4 and 5 exhibit a code dependent output resistance which in turn can cause a code dependent error voltage at the output of the amplifier. The maximum ...

Page 8

AD7537 24-Pin Plastic DIP (N-24) 28-Terminal Leadless Ceramic Chip Carrier (E-28A) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Pin Cerdip (Q-24) 28-Terminal Plastic Leaded Chip Carrier –8– 24-Pin Ceramic DIP (D-24A) (P-28A) REV. 0 ...

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