AD7245ATQ Electronic Devices And integrated circuits iCS
LC2MOS 12 - Bit Dacports
LC2 MOS 12-Bit DACPORTs
AD7245A/AD7248A
FEATURES
- 12-Bit CMOS DAC with Output Amplifier and Reference
- Improved AD7245/AD7248:
- 12 V to 15 V Operation
- ±1/2 LSB Linearity Grade
- Faster Interface–30 ns typ Data Setup Time
- Extended Plastic Temperature Range (–40℃ to +85℃)
- Single or Dual Supply Operation
- Low Power–65 mW typ in Single Supply
- Parallel Loading Structure: AD7245A
- (8+4) Loading Structure: AD7248A
GENERAL DESCRIPTION
The AD7245A/AD7248A is an enhanced version of the industry standard
AD7245/AD7248. Improvements include operation from 12 V to 15 V
supplies, a ±1/2 LSB linearity grade, faster interface times and
better full scale and reference variations with VDD. Additional features include extended temperature range operation
for commercial and industrial grades.
The AD7245A/AD7248A is a complete, 12-bit, voltage output,
digital-to-analog converter with output amplifier and Zener voltage
reference on a monolithic CMOS chip. No external user trims are
required to achieve full specified performance.
Both parts are microprocessor compatible, with high speed data
latches and double-buffered interface logic. The AD7245A accepts
12-bit parallel data which is loaded into the input latch on the
rising edge of CS or WR. The AD7248A has an 8-bit wide data bus
with data loaded to the input latch in two write operations. For
both parts, an asynchronous LDAC signal transfers data from the
input latch to the DAC latch and updates the analog output. The
AD7245A also has a CLR signal on the DAC latch which allows
features such as power-on reset to be implemented.
The on-chip 5 V buried Zener diode provides a low noise,
temperature compensated reference for the DAC. For single supply
operation, two output ranges of 0 V to +5 V and 0 V to +10 V are
available, while these two ranges plus an additional ±5 V range are
available with dual supplies. The output amplifiers are capable of
developing +10 V across a 2 kΩ load to GND.
The AD7245A/AD7248A is fabricated in linear compatible CMOS (LC2
MOS), an advanced, mixed technology process that combines precision
bipolar circuits with low power CMOS logic. The AD7245A is
available in a small, 0.3" wide, 24-pin DIP and SOIC and in
28-terminal surface mount packages. The AD7248A is packaged in a
small, 0.3" wide, 20-pin DIP and SOIC and in 20-terminal surface
mount packages.
PRODUCT HIGHLIGHTS
1. The AD7245A/AD7248A is a 12-bit DACPORT® on a single chip. This
single chip design and small package size offer considerable space
saving and increased reliability over multichip designs.
2. The improved interface times on the part allows easy, direct
interfacing to most modern microprocessors.
3. The AD7245A/AD7248A features a wide power supply range allowing
operation from 12 V supplies.
ABSOLUTE MAXIMUM RATINGS1
VDD to AGND . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to
+17 V
VDD to DGND . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to
+17 V
VDD to VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . .–0.3 V to
+34 V
AGND to DGND . . . . . . . . . . . . . . . . . . . . . . . . . –0.3
V, VDD
Digital Input Voltage to DGND . . . . . . . . –0.3 V, VDD +0.3 V
VOUT to AGND2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS, VDD
VOUT to VSS 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V, +24
V
VOUT to VDD 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –32 V,
0 V
REF OUT2 to AGND . . . . . . . . . . . . . . . . . . . . . . . . 0 V, VDD
Power Dissipation (Any Package) to +75°C . . . . . . . . 450 mW
Derates above +75°C by . . . . . . . . . . . . . . .
. . . . . 6 mW/°C
Operating Temperature
Commercial (A, B Versions) . . . . . . . . . . .
–40°C to +85°C
Extended (S Version) . . . . . . . . . . . . . . .
–55°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to
+150°C
Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . .
+300°C
NOTES
1 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 listed in the operational sections of this
specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2 The output may be shorted to voltages in this range provided the
power dissipation of the package is not exceeded. VOUT short
circuit current is typically 80 mA.
AD7245A FUNCTIONAL BLOCK DIAGRAM
AD7248A FUNCTIONAL BLOCK
DIAGRAM
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