TLC7225C, TLC7225I
QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS109B – OCTOBER 1996 – REVISED FEBRUARY 2001
DW PACKAGE
(TOP VIEW)
Four 8-Bit D/A Converters With Individual
References
Direct Bipolar Operation Without an
External Level-Shift Amplifier
OUTB
OUTA
OUTC
OUTD
1
24
23
22
21
20
19
18
17
16
15
14
2
Microprocessor Compatible
TTL/CMOS Compatible
V
V
3
SS
DD
REFB
REFA
REFC
REFD
A0
4
5
Single Supply Operation Possible
Simultaneous Update Facility
Binary Input Coding
AGND
DGND
LDAC
6
A1
7
WR
8
(MSB) DB7
DB6
DB0 (LSB)
DB1
9
applications
10
11
Process Control
DB5
DB2
DB4 12
13 DB3
Automatic Test Equipment
Automatic Calibration of Large System
Parameters e.g., Gain/Offset
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-bitTTL/CMOS-compatible(5V)inputport. ControlinputsA0andA1determinewhichDAC
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
– 4 V with dual supplies.
DD
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
digitallogiccircuitsandprecisionanalogcircuitstobeintegratedonthesamechip. TheTLC7225hasacommon
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.
Copyright 2001, Texas Instruments Incorporated
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.
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