鈥?/div>
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: 440 碌A(chǔ) (Max)
Per-Channel Power Down: 2 碌A(chǔ) (Max)
Power-On Reset to Midscale
2s Complement Input Data Format
SPI-Compatible Serial Interface: Up to 50 MHz
Daisy-Chain Capability
Asynchronous Hardware Clear
Simultaneous or Sequential Update
Specified Temperature Range: 鈥?0擄C to 105擄C
Small 3-mm 脳 3-mm, 16-Lead QFN Package
DESCRIPTION
The DAC7553 is a 12-bit, dual-channel, volt-
age-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
DAC7553 operates from a single 2.7-V to 5.5-V
supply. The DAC7553 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 at
midscale 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
DAC7553 ideally suited for battery-operated portable
applications. The power consumption is typically
1.5 mW at 5 V, 0.75 mW at 3 V, and reduces to 1 碌W
in power-down mode.
The DAC7553 is available in a 16-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
V
REFA
_
SCLK
SYNC
SDIN
Interface
Logic
Input
Register
DAC
Register
String
DAC B
Input
Register
DAC
Register
String
DAC A
V
FBA
V
OUT
A
V
FBB
V
OUT
B
+
_
+
SDO
DAC7553
Power-On
Reset
Power-Down
Logic
DCEN
CLR
GND
V
REFB
PD
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..
PRODUCT PREVIEW information concerns products in the forma-
tive or design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the
right to change or discontinue these products without notice.
Copyright 漏 2005, Texas Instruments Incorporated
PRODUCT PREVIEW