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PDF ( 数据手册 , 数据表 ) DAC8532

零件编号 DAC8532
描述 Dual Channel/ Low Power/ 16-Bit/ Serial Input DIGITAL-TO-ANALOG CONVERTER
制造商 Burr-Brown Corporation
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DAC8532 数据手册, 描述, 功能
DAC8532
SBAS246A – DECEMBER 2001 – MAY 2003
Dual Channel, Low Power, 16-Bit, Serial Input
DIGITAL-TO-ANALOG CONVERTER
FEATURES
q microPOWER OPERATION: 500µA at 5V
q POWER-ON RESET TO ZERO-SCALE
q POWER SUPPLY: +2.7V to +5.5V
q 16-BIT MONOTONIC OVER TEMPERATURE
q SETTLING TIME: 10µs to ±0.003% FSR
q ULTRA-LOW AC CROSSTALK: –100dB typ
q LOW-POWER SERIAL INTERFACE WITH
SCHMITT-TRIGGERED INPUTS
q ON-CHIP OUTPUT BUFFER AMPLIFIER WITH
RAIL-TO-RAIL OPERATION
q DOUBLE BUFFERED INPUT ARCHITECTURE
q SIMULTANEOUS OR SEQUENTIAL OUTPUT
UPDATE AND POWERDOWN
q TINY MSOP-8 PACKAGE
APPLICATIONS
q PORTABLE INSTRUMENTATION
q CLOSED-LOOP SERVO-CONTROL
q PROCESS CONTROL
q DATA ACQUISITION SYSTEMS
q PROGRAMMABLE ATTENUATION
q PC PERIPHERALS
VDD
DESCRIPTION
The DAC8532 is a dual channel, 16-bit Digital-to-Analog
Converter (DAC) offering low power operation and a flexible
serial host interface. Each on-chip precision output amplifier
allows rail-to-rail output swing to be achieved over the supply
range of 2.7V to 5.5V. The device supports a standard 3-wire
serial interface capable of operating with input data clock
frequencies up to 30MHz for VDD = 5V.
The DAC8532 requires an external reference voltage to set
the output range of each DAC channel. Also incorporated
into the device is a power-on reset circuit which ensures that
the DAC outputs power up at zero-scale and remain there
until a valid write takes place. The DAC8532 provides a
flexible power-down feature, accessed over the serial inter-
face, that reduces the current consumption of the device to
200nA at 5V.
The low-power consumption of this device in normal opera-
tion makes it ideally suited to portable battery-operated
equipment and other low-power applications. The power
consumption is 2.5mW at 5V, reducing to 1µW in power-
down mode.
The DAC8532 is available in a MSOP-8 package with a
specified operating temperature range of –40°C to +105°C.
VREF
Data
Buffer A
DAC
Register A
DAC A
VOUTA
SYNC
SCLK
DIN
Data
Buffer B
DAC
Register B
DAC B
16
24-Bit
Serial-to-
Channel
Load
Parallel
Select
Control
Shift 8
Register
Control Logic
2
GND
Power-Down
Control Logic
Resistor
Network
VOUTB
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2001-2003, Texas Instruments Incorporated







DAC8532 pdf, 数据表
TYPICAL CHARACTERISTICS (Cont.)
At TA = +25°C, unless otherwise noted.
1150
1050
950
850
SUPPLY CURRENT vs LOGIC INPUT VOLTAGE
TA = 25°C, SYNC Input (All Other Inputs = GND)
Reference Current Included,
CHA and CHB Active,
No Load
VDD = VREF = 5V
750
650
550
VDD = VREF = 2.7V
450
0 123 45
VLOGIC (V)
FULL-SCALE SETTLING TIME
(Large Signal)
VDD = VREF = 5V,
5 Output Loaded with
2kand 200pF to
4 GND
3
2
1
0
Time (2µs/div)
HALF-SCALE SETTLING TIME
(Large Signal)
3 VDD = VREF = 5V,
Output Loaded with
2.5 2kand 200pF
to GND.
2
1.5
1
0.5
0
Time (2µs/div)
FULL-SCALE SETTLING TIME
(Large Signal)
3.5 VDD = VREF = 2.7V,
3
Output Loaded with
2kand 200pF
2.5 to GND.
2
1.5
1
0.5
0
Time (2µs/div)
HALF-SCALE SETTLING TIME
(Large Signal)
VDD = VREF = 2.7V,
Output Loaded with
1.5 2kand 200pF
to GND.
1
0.5
0
Time (2µs/div)
POWER-ON RESET TO ZERO-SCALE
Loaded with 2kto GND
VDD (2V/div)
VOUT (1V/div)
Time (100µs/div)
8 DAC8532
www.ti.com
SBAS246A







DAC8532 equivalent, schematic
+5V
R1
10k
10µF
0.1µF
VDD, VREF DAC8532
VOUTX
(Other pins omitted for clarity.)
R2
10k
+5V
OPA703
5V
±5V
FIGURE 11. Bipolar Operation with the DAC8532.
The output voltage for any input code can be calculated as
follows:
VOUT X
=
VREF


D
65536


R1 + R
R1
2

VREF

R2
R1



where D represents the input code in decimal (065535).
With VREF = 5V, R1 = R2 = 10k:
VOUTX =  615053D6 5V
This is an output voltage range of ±5V with 0000H corre-
sponding to a 5V output and FFFFH corresponding to a +5V
output. Similarly, using VREF = 2.5V, a ±2.5V output voltage
range can be achieved.
LAYOUT
A precision analog component requires careful layout, ad-
equate bypassing, and clean, well-regulated power supplies.
The DAC8532 offers single-supply operation, and it will often
be used in close proximity with digital logic, microcontrollers,
microprocessors, and digital signal processors. The more
digital logic present in the design and the higher the switch-
ing speed, the more difficult it will be to keep digital noise
from appearing at the output.
Due to the single ground pin of the DAC8532, all return
currents, including digital and analog return currents for the
DAC, must flow through a single point. Ideally, GND would
be connected directly to an analog ground plane. This plane
would be separate from the ground connection for the digital
components until they were connected at the power entry
point of the system.
The power applied to VDD should be well regulated and low
noise. Switching power supplies and DC/DC converters will
often have high-frequency glitches or spikes riding on the
output voltage. In addition, digital components can create
similar high-frequency spikes as their internal logic switches
states. This noise can easily couple into the DAC output
voltage through various paths between the power connec-
tions and analog output.
As with the GND connection, VDD should be connected to a
positive power-supply plane or trace that is separate from the
connection for digital logic until they are connected at the
power entry point. In addition, a 1µF to 10µF capacitor in
parallel with a 0.1µF bypass capacitor is strongly recom-
mended. In some situations, additional bypassing may be
required, such as a 100µF electrolytic capacitor or even a
Pifilter made up of inductors and capacitorsall designed
to essentially low-pass filter the supply, removing the high-
frequency noise.
16 DAC8532
www.ti.com
SBAS246A










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