TLC7225 Datasheet, PDF (1/22 Pages) Texas Instruments – QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS

TLC7225C, TLC7225I
QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
D Four 8-Bit D/A Converters With Individual
References
D Direct Bipolar Operation Without an
External Level-Shift Amplifier
D Microprocessor Compatible
D TTL/CMOS Compatible
D Single Supply Operation Possible
D Simultaneous Update Facility
D Binary Input Coding
applications
D Process Control
D Automatic Test Equipment
D Automatic Calibration of Large System
Parameters e.g., Gain/Offset
SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001
DW PACKAGE
(TOP VIEW)
OUTB ₁
OUTA ₂
V_SS 3
REFB 4
REFA 5
AGND 6
DGND 7
LDAC 8
(MSB) DB7 9
DB6 10
DB5 11
DB4 12
24 ^OUTC
23 ^OUTD
22 V_DD
21 REFC
20 REFD
19 A0
18 A1
17 WR
16 DB0 (LSB)
15 DB1
14 DB2
13 DB3
description
The TLC7225 consists of four 8-bit voltage-output digital-to-analog converters (DACs), with output buffer
amplifiers and interface logic with double register-buffering.
Separate on-chip latches are provided for each of the DACs. Data is transferred into one of these data latches
through a common 8-bit TTL/CMOS-compatible (5 V) input port. Control inputs A0 and A1 determine which DAC
is loaded when WR goes low. Only the data held in the DAC registers determines the analog outputs of the
converters. The double register buffering allows simultaneous update of all four outputs under control of LDAC.
All logic inputs are TTL- and CMOS-level compatible and the control logic is speed compatible with most 8-bit
microprocessors. Each DAC includes an output buffer amplifier capable of driving up to 5 mA of output current.
The TLC7225 performance is specified for input reference voltages from 2 V to V_DD – 4 V with dual supplies.
The voltage-mode configuration of the DACs allow the TLC7225 to be operated from a single power-supply rail
at a reference of 10 V.
The TLC7225 is fabricated in a LinBiCMOS process that has been specifically developed to allow high-speed
digital logic circuits and precision analog circuits to be integrated on the same chip. The TLC7225 has a common
8-bit data bus with individual DAC latches. This provides a versatile control architecture for simple interface to
microprocessors. All latch-enable signals are level triggered.
Combining four DACs, four operational amplifiers, and interface logic into a small, 0.3-inch wide, 24-terminal
SOIC allows significant reduction in board space requirements and offers increased reliability in systems using
multiple converters. The pinout optimizes board layout with all of the analog inputs and outputs at one end of
the package and all of the digital inputs at the other.
The TLC7225C is characterized for operation from 0°C to 70°C. The TLC7225I is characterized for operation
from – 25°C to 85°C.
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.
LinBiCMOS is a trademark of Texas Instruments.
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.
Copyright  2001, Texas Instruments Incorporated
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