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DAC7558 Datasheet

  • DAC7558

  • 12-BIT, OCTAL, ULTRALOW GLITCH, VOLTAGE OUTPUT DIGITAL-TO-AN...

  • 25頁

  • TI

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DAC7558
www.ti.com
SLAS435 鈥?MAY 2005
12-BIT, OCTAL, ULTRALOW GLITCH, VOLTAGE OUTPUT
DIGITAL-TO-ANALOG CONVERTER
FEATURES
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2.7-V to 5.5-V Single Supply
12-Bit Linearity and Monotonicity
Rail-to-Rail Voltage Output
Settling Time: 5 碌s (Max)
Ultralow Glitch Energy: 0.1 nVs
Ultralow Crosstalk: 鈥?00 dB
Low Power: 1.8 mA (Max)
Per-Channel Power Down: 2 碌A(chǔ) (Max)
Power-On Reset to Zero Scale and Mid Scale
SPI-Compatible Serial Interface: Up to 50 MHz
Simultaneous or Sequential Update
Asynchronous Clear
Binary and Twos-Complement Capability
Daisy-Chain Operation
1.8-V to 5.5-V Logic Compatibility
Specified Temperature Range: 鈥?0擄C to 105擄C
Small, 5-mm x 5-mm, 32-Lead QFN Package
DESCRIPTION
The DAC7558 is a 12-bit, octal-channel, voltage
output DAC with exceptional linearity and
monotonicity. Its proprietary architecture minimizes
undesired transients such as code to code glitch and
channel to channel crosstalk. The low-power
DAC7558 operates from a single 2.7-V to 5.5-V
supply. The DAC7558 output amplifiers can drive a
2-k鈩? 200-pF load rail-to-rail with 5-碌s settling time;
the output range is set using an external voltage
reference.
The 3-wire serial interface operates at clock rates up
to 50 MHz and is compatible with SPI, QSPI,
Microwire鈩? and DSP interface standards. The out-
puts of all DACs may be updated simultaneously or
sequentially. The parts incorporate a power-on-reset
circuit to ensure that the DAC outputs power up to
zero volts and remain there until a valid write cycle to
the device takes place. The parts contain a
power-down feature that reduces the current con-
sumption of the device to under 2 碌A(chǔ).
The small size and low-power operation makes the
DAC7558 ideally suited for battery-operated portable
applications. The power consumption is typically 7.5
mW at 5 V, 3.7 mW at 3 V, and reduces to 1 碌W in
power-down mode.
The DAC7558 is available in a 32-lead QFN package
and is specified over 鈥?0擄C to 105擄C.
APPLICATIONS
Portable Battery-Powered Instruments
Digital Gain and Offset Adjustment
Programmable Voltage and Current Sources
Programmable Attenuators
Industrial Process Control
FUNCTIONAL BLOCK DIAGRAM
V
DD
IOV
DD
VREF1
VREF2
VFBA
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Input
Register
SCLK
SYNC
Interface
Logic
VFBH
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SDO
Input
Register
Power-On
Reset
DCEN
RST RSTSEL
AGND
DGND VREF3
VREF4
DAC
Register
String
DAC H
+
Power-Down
Logic
PD
V
OUT
H
DAC
Register
String
DAC A
+
V
OUT
A
SDIN
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.
Microwire is a trademark of National Semiconductor Corp..
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 漏 2005, Texas Instruments Incorporated

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