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AD557JP Datasheet(PDF) 1 Page - Analog Devices

Part # AD557JP
Description  DACPORT, Low-Cost Complete mP-Compatible 8-Bit DAC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD557JP Datasheet(HTML) 1 Page - Analog Devices

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REV. A
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.
a
DACPORT, Low-Cost Complete
P-Compatible 8-Bit DAC
AD557
FEATURES
Complete 8-Bit DAC
Voltage Output—0 V to 2.56 V
Internal Precision Band-Gap Reference
Single-Supply Operation: +5 V ( 10%)
Full Microprocessor Interface
Fast: 1
s Voltage Settling to
1/2 LSB
Low Power: 75 mW
No User Trims Required
Guaranteed Monotonic Over Temperature
All Errors Specified TMIN to TMAX
Small 16-Pin DIP or 20-Pin PLCC Package
Low Cost
GENERAL DESCRIPTION
The AD557 DACPORT® is a complete voltage-output 8-bit
digital-to-analog converter, including output amplifier, full
microprocessor interface and precision voltage reference on a
single monolithic chip. No external components or trims are
required to interface, with full accuracy, an 8-bit data bus to an
analog system.
The low cost and versatility of the AD557 DACPORT are the re-
sult of continued development in monolithic bipolar technologies.
The complete microprocessor interface and control logic is
implemented with integrated injection logic (I
2L), an extremely
dense and low-power logic structure that is process-compatible
with linear bipolar fabrication. The internal precision voltage
reference is the patented low-voltage band-gap circuit which
permits full-accuracy performance on a single +5 V power sup-
ply. Thin-film silicon-chromium resistors provide the stability
required for guaranteed monotonic operation over the entire
operating temperature range, while laser-wafer trimming of
these thin-film resistors permits absolute calibration at the fac-
tory to within
±2.5 LSB; thus, no user-trims for gain or offset
are required. A new circuit design provides voltage settling to
±1/2 LSB for a full-scale step in 800 ns.
The AD557 is available in two package configurations. The
AD557JN is packaged in a 16-pin plastic, 0.3"-wide DIP. For
surface mount applications, the AD557JP is packaged in a
20-pin JEDEC standard PLCC. Both versions are specified over
the operating temperature range of 0
°C to +70°C.
DACPORT is a registered trademark of Analog Devices, Inc.
Covered by U.S. Patent Nos. 3,887,863; 3,685,045; 4,323,795; other
patents pending.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
PRODUCT HIGHLIGHTS
1. The 8-bit I
2L input register and fully microprocessor-
compatible control logic allow the AD557 to be directly con-
nected to 8- or 16-bit data buses and operated with standard
control signals. The latch may be disabled for direct DAC
interfacing.
2. The laser-trimmed on-chip SiCr thin-film resistors are cali-
brated for absolute accuracy and linearity at the factory.
Therefore, no user trims are necessary for full rated accuracy
over the operating temperature range.
3. The inclusion of a precision low-voltage band-gap reference
eliminates the need to specify and apply a separate reference
source.
4. The AD557 is designed and specified to operate from a single
+4.5 V to +5.5 V power supply.
5. Low digital input currents, 100
µA max, minimize bus loading.
Input thresholds are TTL/low voltage CMOS compatible.
6. The single-chip, low power I
2L design of the AD557 is inher-
ently more reliable than hybrid multichip or conventional
single-chip bipolar designs.
FUNCTIONAL BLOCK DIAGRAM


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