Document
TLV5638
www.ti.com
SLAS225C – JUNE 1999 – REVISED JANUARY 2004
2.7-V TO 5.5-V LOW-POWER DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTER WITH INTERNAL REFERENCE AND POWER DOWN
FEATURES
• Dual 12-Bit Voltage Output DAC • Programmable Internal Reference • Programmable Settling Time:
– 1 µs in Fast Mode, – 3.5 µs in Slow Mode • Compatible With TMS320 and SPI™ Serial Ports • Differential Nonlinearity <0.5 LSB Typ • Monotonic Over Temperature
APPLICATIONS
• Digital Servo Control Loops • Digital Offset and Gain Adjustment • Industrial Process Control • Machine and Motion Control Devices • Mass Storage Devices
D, JG PACKAGE (TOP VIEW)
DIN 1 SCLK 2
CS 3 OUTA 4
8 VDD 7 OUTB 6 REF 5 AGND
FK PACKAGE (TOP VIEW)
NC DIN NC VDD NC
NC SCLK
NC CS NC
3 2 1 20 19
4
18
5
17
6
16
7
15
8
14
9 10 11 12 13
NC OUTB NC REF NC
NC OUTA
NC AGND
NC
DESCRIPTION
The TLV5638 is a dual 12-bit voltage output DAC with a flexible 3-wire serial interface. The serial interface allows glueless interface to TMS320, SPI™, QSPI™, and Microwire™ serial ports. It is programmed with a 16-bit serial string containing 4 control and 12 data bits.
The resistor string output voltage is buffered by a x2 gain rail-to-rail output buffer. The buffer features a Class AB output stage to improve stability and reduce settling time. The programmable settling time of the DAC allows the designer to optimize speed vs power dissipation. With its on-chip programmable precision voltage reference, the TLV5638 simplifies overall system design.
Because of its ability to source up to 1 mA, the reference can also be used as a system reference. Implemented with a CMOS process, the device is designed for single supply operation from 2.7 V to 5.5 V. It is available in an 8-pin SOIC package to reduce board space in standard commercial, industrial, and automotive temperature ranges. It is also available in JG and FK packages in the military temperature range.
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.
SPI, QSPI are trademarks of Motorola, Inc. Microwire is a trademark of National Semiconductor Corporation.
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 © 1999–2004, Texas Instruments Incorporated
TLV5638
SLAS225C – JUNE 1999 – REVISED JANUARY 2004
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
TA
0°C to 70°C 40°C to 85°C 40°C to 125°C 55°C to 125°C
AVAILABLE OPTIONS
SOIC (D)
TLV5638CD
TLV5638ID
TLV5638QD TLV5638QDR
—
PACKAGE CERAMIC DIP
(JG) — —
—
TLV5638MJG
20 PAD LCCC (FK) — —
—
TLV5638MFK
FUNCTIONAL BLOCK DIAGRAM
REF AGND VDD
PGA With Output Enable
Voltage Bandgap
Power-On Reset
Power and Speed
Control
2
DIN SCLK
CS
2 2-Bit
Control Latch
Serial
Interface
12
and
Control
12
12-Bit
12
DAC A
Latch
Buffer
12
12
12-Bit
DAC B
Latch
x2
OUTA
x2
OUTB
2
www.ti.com
TERMINAL
NAME
NO.
AGND
5
CS
3
DIN
1
OUT A
4
OUT B
7
REF
6
SCLK
2
VDD
8
TLV5638
Terminal Functions
SLAS225C – JUNE 1999 – REVISED JANUARY 2004
I/O/P
DESCRIPTION
P Ground I Chip select. Digital input active low, used to enable/disable inputs I Digital serial data input O DAC A analog voltage output O DAC B analog voltage output I/O Analog reference voltage input/output I Digital serial clock input P Positive power supply
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
Supply voltage (VDD to AGND) Reference input voltage range
Digital input voltage range
Operating free-air temperature range, TA
TLV5638C TLV5638I
TLV5638Q
TLV5638M
Storage temperature range, Tstg Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
UNIT 7V -0.3 V to VDD + 0.3 V -0.3 V to VDD + 0.3 V 0°C to 70°C -40°C to 85°C -40°C to 125°C -55°C to 125°C -65°C to 150°C 260°C
(1) Stresses beyond those listed under,, absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under,, recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may aff.