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PDF DAC8822 Data sheet ( Hoja de datos )
| Número de pieza | DAC8822 | |
| Descripción | Multiplying Digital-to-Analog Converter | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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BurrĆBrown Products
from Texas Instruments
DAC8822
DAC8822
SBAS390A – DECEMBER 2006 – REVISED MARCH 2007
16-Bit, Dual, Parallel Input, Multiplying
Digital-to-Analog Converter
FEATURES
• ±0.5LSB DNL
• ±1LSB INL
• Low Noise: 12nV/√Hz
• Low Power Operation:
IDD = 1µA per Channel at 2.7V
• 2mA Full-Scale Current, with VREF = 10V
• Settling Time: 0.5µs
• 16-Bit Monotonic
• 4-Quadrant Multiplying Reference Inputs
• Reference Bandwidth: 10MHz
• Reference Input: ±18V
• Reference Dynamics: –105 THD
• Midscale or Zero Scale Reset
• Analog Power Supply: +2.7V to +5.5V
• TSSOP-38 Package
• Industry-Standard Pin Configuration
• Pin-Compatible with the 14-Bit DAC8805
• Temperature Range: –40°C to +125°C
APPLICATIONS
• Automatic Test Equipment
• Instrumentation
• Digitally Controlled Calibration
• Industrial Control PLCs
DESCRIPTION
The DAC8822 dual, multiplying digital-to-analog
converter (DAC) is designed to operate from a single
2.7V to 5.5V supply.
The applied external reference input voltage VREF
determines the full-scale output current. An internal
feedback resistor (RFB) provides temperature
tracking for the full-scale output when combined with
an external, current-to-voltage (I/V) precision
amplifier.
A RSTSEL pin allows system reset assertion (RS) to
force all registers to zero code when RSTSEL = '0',
or to midscale code when RSTSEL = '1'. Additionally,
an internal power-on reset forces all registers to zero
or midscale code at power-up, depending on the
state of the RSTSEL pin.
A parallel interface offers high-speed
communications. The DAC8822 is packaged in a
space-saving TSSOP-38 package and has an
industry-standard pinout. The device is specified
fromwww.DataSheet4U.com –40°C to +125°C.
For a 14-bit, pin-compatible version, see the
DAC8805.
DGND VDD
R1A RCOMA VREFA ROFSA
RFBA
R1A
R2A
ROFSA RFBA
D0
D15
WR
A0
A1
RS
LDAC
RSTSEL
Parallel
Bus
Interface
Input A
Register
Input B
Register
Control
Logic
Power-On
Reset
DAC A
Register
DAC B
Register
R1B
R2B
DAC A
DAC B
ROFSB RFBB
IOUTA
AGNDA
IOUTB
AGNDB
R1B RCOMB VREFB ROFSB
RFBB
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2007, Texas Instruments Incorporated
1 page  
www.ti.com
PIN #
1, 2, 24-28,
30-38
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
29
NAME
D0-D15
ROFSA
RFBA
R1A
RCOMA
VREFA
IOUTA
AGNDA
DGND
AGNDB
IOUTB
VREFB
RCOMB
R1B
RFBB
ROFSB
WR
A0
A1
LDAC
RSTSEL
RS
VDD
DAC8822
SBAS390A – DECEMBER 2006 – REVISED MARCH 2007
PIN ASSIGNMENTS (continued)
Table 1. TERMINAL FUNCTIONS
DESCRIPTION
Digital Input Data Bits D0 to D15. Signal level must be ≤ VDD +0.3V. D15 is MSB.
Bipolar Offset Resistor A. Accepts up to ±18V.
In 2-quadrant mode, ROFSA ties to RFBA.
In 4-quadrant mode, ROFSA ties to R1A and the external reference.
Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion.
4-Quadrant Resistor.
In 2-quadrant mode, R1A shorts to the VREFA pin.
In 4-quadrant mode, R1A ties to ROFSA and the reference input.
Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A.
In 2-quadrant mode, RCOMA shorts to the VREF pin.
In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier.
DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode.
In 2-quadrant mode, VREFA is the reference input with constant input resistance versus code.
In 4-quadrant mode, VREFA is driven by the external reference amplifier.
DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage
output.
DAC A Analog Ground.
Digital Ground.
DAC B Analog Ground.
DAC B Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage
output.
DAC B Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode.
In 2-quadrant mode, VREFB is the reference input with constant input resistance versus code.
In 4-quadrant mode, VREFB is driven by the external reference amplifier.
Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B.
In 2-quadrant mode, RCOMB shorts to the VREF pin.
In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier.
4-Quadrant Resistor.
In 2-quadrant mode, R1B shorts to the VREFB pin.
In 4-quadrant mode, R1B ties to ROFSB and the reference input.
Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion.
Bipolar Offset Resistor B. Accepts up to ±18V.
In 2-quadrant mode, ROFSB ties to RFBB.
In 4-quadrant mode, ROFSB ties to R1B and the external reference.
Write Control Digital Input In, Active Low. WR enables input registers.
Signal level must be ≤ VDD + 0.3V.
Address 0. Signal level must be ≤ VDD + 0.3V.
Address 1. Signal level must be ≤ VDD + 0.3V.
Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3V. See the Function of Control Inputs
table for details.
Power-On Reset State.
RSTSEL = 0 corresponds to zero-scale reset.
RSTSEL = 1 corresponds to midscale reset.
The signal level must be ≤ VDD + 0.3V.
Reset. Active low resets both input and DAC registers.
Resets to zero-scale if RSTSEL= 0, and to midscale if RSTSEL = 1.
Signal level must be equal to or less than VDD + 0.3 V.
Positive Power Supply Input. The specified range of operation is 2.7V to 5.5V.
Submit Documentation Feedback
5
5 Page 
www.ti.com
Channel A
DAC8822
SBAS390A – DECEMBER 2006 – REVISED MARCH 2007
TYPICAL CHARACTERISTICS: VDD = +2.7V
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = +25°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 18.
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = -40°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 20.
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = +125°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 22.
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = +25°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 19.
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = -40°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 21.
LINEARITY ERROR
vs DIGITAL INPUT CODE
1.0
0.8 TA = +125°C
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
8192 16384 24576 32768 40960 49152 57344 65535
Code
Figure 23.
Submit Documentation Feedback
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet DAC8822.PDF ] | |
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