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Analog Devices Semiconductor Electronic Components Datasheet

AD557 Datasheet

DACPORT/ Low-Cost Complete mP-Compatible 8-Bit DAC

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AD557 pdf
a
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
DACPORT, Low-Cost Complete
P-Compatible 8-Bit DAC
AD557
FUNCTIONAL BLOCK DIAGRAM
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 (I2L), 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.
PRODUCT HIGHLIGHTS
1. The 8-bit I2L 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 I2L design of the AD557 is inher-
ently more reliable than hybrid multichip or conventional
single-chip bipolar designs.
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.
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

AD557 Datasheet

DACPORT/ Low-Cost Complete mP-Compatible 8-Bit DAC

No Preview Available !

AD557 pdf
AD557–SPECIFICATIONS (@ TA = +25؇C, VCC = +5 V unless otherwise noted)
Model
Min Typ Max
Units
RESOLUTION
RELATIVE ACCURACY
0 to + 70°C
OUTPUT
Ranges
Current Source
Sink
OUTPUT SETTLING TIME3
FULL-SCALE ACCURACY4
@ +25°C
TMIN to TMAX
ZERO ERROR
@ +25°C
TMIN to TMAX
MONOTONICITY5
TMIN to TMAX
DIGITAL INPUTS
TMIN to TMAX
Input Current
Data Inputs, Voltage
Bit On—Logic “1”
Bit On—Logic “0”
Control Inputs, Voltage
On—Logic “1”
On—Logic “0”
Input Capacitance
TIMING6
tW Strobe Pulse Width
TMIN to TMAX
tDH Data Hold Time
TMIN to TMAX
tDS Data Setup Time
TMIN to TMAX
POWER SUPPLY
Operating Voltage Range (VCC)
2.56 Volt Range
Current (ICC)
Rejection Ratio
8 Bits
± 1/2 1
LSB
0 to + 2.56
+5
Internal Passive
Pull-Down to Ground2
0.8 1.5
V
mA
µs
± 1.5
± 2.5
± 2.5
± 4.0
LSB
LSB
± 1 LSB
± 3 LSB
Guaranteed
2.0
0
2.0
0
4
225
300
10
10
225
300
؎100
0.8
0.8
µA
V
V
V
V
pF
ns
ns
ns
ns
ns
ns
+4.5 +5.5 V
15 25
mA
0.03 %/%
PIN CONFIGURATIONS
DIP
LSB BIT 8 1
BIT 7 2
16 VOUT
15 VOUT SENSE A
BIT 6
BIT 5
BIT 4
3 14 VOUT SENSE B
AD557
4 TOP VIEW 13 GND
5 (Not to Scale) 12 GND
BIT 3 6
11 +VCC
BIT 2 7
10 CS
MSB BIT 1 8
9 CE
PLCC
BIT 6 4
BIT 5 5
NC 6
BIT 4 7
BIT 3 8
3 2 1 20 19
PIN 1
IDENTIFIER
AD557
TOP VIEW
(Not to Scale)
18 VOUT SENSE B
17 GND
16 NC
15 GND
14 +VCC
9 10 11 12 13
POWER DISSIPATION, VCC = 5 V
OPERATING TEMPERATURE RANGE 0
75 125
mW
+70 °C
NC = NO CONNECT
NOTES
1Relative Accuracy is defined as the deviation of the code transition points from the
ideal transfer point on a straight line from the zero the the full scale of the device.
2Passive pull-down resistance is 2 k.
3Settling time is specified for a positive-going full-scale step to ± 1/2 LSB. Negative-
going steps to zero are slower, but can be improved with an external pull-down.
4The full-scale output voltage is 2.55 V and is guaranteed with a +5 V supply.
5A monotonic converter has a maximum differential lineraity error of ± 1 LSB.
6See Figure 7.
Specifications subject to change without notice.
Model
AD557JN
AD557JP
ORDERING GUIDE
Temperature Range Package Option*
0°C to +70°C
0°C to +70°C
N-16
P-20A
ABSOLUTE MAXIMUM RATINGS*
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to +18 V
Digital Inputs (Pins 1–10) . . . . . . . . . . . . . . . . . . 0 V to +7.0 V
VOUT . . . . . . . . . . . . . . . . . . . . . . . Indefinite Short to Ground
Momentary Short to VCC
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450 mW
Storage Temperature Range
N/P (Plastic) Packages . . . . . . . . . . . . . . . . –25°C to +100°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . 300°C
Thermal Resistance
Junction to Ambient/Junction to Case
N/P (Plastic) Packages . . . . . . . . . . . . . . . . . .140/55°C/W
*Stresses above those listed under “Absolute Maximum Ratings” may cause
permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated
in the operational section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
*N = Plastic DIP; P = Plastic Leaded Chip Carrier.
CIRCUIT DESCRIPTION
The AD557 consists of four major functional blocks fabricated
on a single monolithic chip (see Figure 1). The main D/A con-
verter section uses eight equally weighted laser-trimmed current
sources switched into a silicon-chromium thin-film R/2R resistor
ladder network to give a direct but unbuffered 0 mV to 400 mV
output range. The transistors that form the DAC switches are
PNPs; this allows direct positive-voltage logic interface and a
zero-based output range.
–2– REV. A


Part Number AD557
Description DACPORT/ Low-Cost Complete mP-Compatible 8-Bit DAC
Maker Analog Devices
Total Page 4 Pages
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