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TLV5621ID Datasheet Preview

TLV5621ID Datasheet

Low-Power Quadruple 8-Bit Digital-to-Analog Converter

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TLV5621I
LOW-POWER QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTER
D 2.7-V to 5.5-V Single-Supply Operation
D Four 8-Bit Voltage Output DACs
D One-Half Power 8-Bit Voltage Output DAC
D Fast Serial Interface . . . 1 MHz Max
D Simple Two-Wire Interface In Single
Buffered Mode
D High-Impedance Reference Inputs For Each
DAC
D Programmable for 1 or 2 Times Output
Range
D Simultaneous-Update Facility In
Double-Buffered Mode
D Internal Power-On Reset
D Industry Temperature Range
description
SLAS138B – APRIL 1996 – REVISED FEBRUARY 1997
D Low Power Consumption
D Half-Buffered Output
D Power-Down Mode
applications
D Programmable Voltage Sources
D Digitally-Controlled Amplifiers/Attenuators
D Cordless/Wireless Communications
D Automatic Test Equipment
D Portable Test Equipment
D Process Monitoring and Control
D Signal Synthesis
D PACKAGE
(TOP VIEW)
The TLV5621I is a quadruple 8-bit voltage output
digital-to-analog converter (DAC) with buffered
reference inputs (high impedance). The DAC
produces an output voltage that ranges between
either one or two times the reference voltages and
GND, and the DAC is monotonic. The device is
simple to use since it operates from a single
supply of 2.7 V to 5.5 V. A power-on reset function
is incorporated to provide repeatable start-up
conditions. A global hardware shut-down terminal
and the capability to shut down each individual
DAC with software are provided to minimize
power consumption.
GND 1
REFA 2
REFB 3
REFC 4
REFD 5
DATA 6
CLK 7
14 VDD
13 HWACT
12 DACA
11 DACB
10 DACC
9 DACD
8 EN
Digital control of the TLV5621I is over a simple 3-wire serial bus that is CMOS compatible and easily interfaced
to all popular microprocessor and microcontroller devices. A TLV5621I 11-bit command word consists of
eight bits of data, two DAC select bits, and a range bit for selection between the times one or times two output
range. The TLV5621I digital inputs feature Schmitt triggers for high noise immunity. The DAC registers are
double buffered which allows a complete set of new values to be written to the device, and then under control
of the HWACT signal, all of the DAC outputs are updated simultaneously.
The 14-terminal small-outline (D) package allows digital control of analog functions in space-critical
applications. The TLV5621I does not require external trimming. The TLV5621I is characterized for operation
from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGE
TA
SMALL OUTLINE
(D)
– 40°C to 85°C
TLV5621ID
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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1997, Texas Instruments Incorporated
1




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TLV5621ID Datasheet Preview

TLV5621ID Datasheet

Low-Power Quadruple 8-Bit Digital-to-Analog Converter

No Preview Available !

TLV5621I
LOW-POWER QUADRUPLE 8-BIT DIGITAL-TO-ANALOG CONVERTER
SLAS138B – APRIL 1996 – REVISED FEBRUARY 1997
functional block diagram
REFA
+
DAC
+
8 Latch
Latch 8
×2
REFB
+
DAC
+
8 Latch
Latch 8
×2
REFC
+
DAC
+
8 Latch
Latch 8
×2
REFD
+
DAC
+
8 Latch
Latch 8
×2
DACA
DACB
DACC
DACD
CLK
DATA
EN
HWACT
Serial
Interface
Power-On
Reset
TERMINAL
NAME NO.
CLK
7
DACA
12
DACB
11
DACC
10
DACD
9
DATA
6
EN
8
GND
1
HWACT
13
REFA
2
REFB
3
REFC
4
REFD
5
VDD
14
Terminal Functions
I/O
DESCRIPTION
I Serial interface clock, data enters on the negative edge
O DAC A analog output
O DAC B analog output
O DAC C analog output
O DAC D analog output
I Serial-interface digital-data input
I Input enable
Ground return and reference
I Global hardware activate
I Reference voltage input to DACA
I Reference voltage input to DACB
I Reference voltage input to DACC
I Reference voltage input to DACD
Positive supply voltage
detailed description
The TLV5621 is implemented using four resistor-string DACs. The core of each DAC is a single resistor with
256 taps, corresponding to the 256 possible codes listed in Table 1. One end of each resistor string is connected
to GND and the other end is fed from the output of the reference input buffer. Monotonicity is maintained by use
of the resistor strings. Linearity depends upon the matching of the resistor elements and upon the performance
of the output buffer. Because the inputs are buffered, the DACs always present a high-impedance load to the
reference source.
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number TLV5621ID
Description Low-Power Quadruple 8-Bit Digital-to-Analog Converter
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