FEATURES•Settling Time to 0.5 LSB . . . 12.5 µs Typ
•10-Bit CMOS Voltage Output DAC in an
8-Terminal Package
•5-V Single Supply Operation
•3-Wire Serial Interface
•High-Impedance Reference Inputs
•Voltage Output Range . . . 2 Times the Refer-ence Input Voltage•Battery Operated/Remote Industrial Controls
•Internal Power-On Reset•Machine and Motion Control Devices
•Low Power Consumption . . . 1.75 mW Max•Cellular Telephones
•Update Rate of 1.21 MHz
D, P, OR DGK PACKAGE
(TOP VIEW)
•Monotonic Over Temperature
•Pin Compatible With the Maxim MAX515
APPLICATIONS
•Battery-Powered Test Instruments
•Digital Offset and Gain Adjustment
DESCRIPTION
The TLC5615 is a 10-bit voltage output digital-to-analog converter (DAC) with a buffered reference input (high
impedance). The DAC has an output voltage range that is two times the reference voltage, and the DAC is
monotonic. The device is simple to use, running from a single supply of 5 V. A power-on-reset function is
incorporated to ensure repeatable start-up conditions.
Digital control of the TLC5615 is over a three-wire serial bus that is CMOS compatible and easily interfaced to
industry standard microprocessor and microcontroller devices. The device receives a 16-bit data word to produce
the analog output. The digital inputs feature Schmitt triggers for high noise immunity. Digital communication
protocols include the SPI™, QSPI™, and Microwire™ standards.
The 8-terminal small-outline D package allows digital control of analog functions in space-critical applications. The
TLC5615C is characterized for operation from 0°C to 70°C. The TLC5615I is characterized for operation from -40°C
to 85°C.
AVAILABLE OPTIONS
PACKAGE
T
A
0°C to 70°CTLC5615CDTLC5615CDGKTLC5615CP
40°C to 85°CTLC5615IDTLC5615IDGKTLC5615IP
(1)
Available in tape and reel as the TLC5615CDR and the TLC5615IDR
SPI, QSPI are trademarks of Motorola, Inc.
Microwire is a trademark of National Semiconductor Corporation.
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 tospecifications per the terms ofTexas Instruments
standard warranty. Production processing does not necessarily includetestingof allparameters.
over operating free-air temperature range (unless otherwise noted)
Supply voltage (VDDto AGND)7 V
Digital input voltage range to AGND- 0.3 V to VDD+ 0.3 V
Reference input voltage range to AGND- 0.3 V to VDD+ 0.3 V
Output voltage at OUT from external sourceVDD+ 0.3 V
Continuous current at any terminal±20 mA
Operating free-air temperature range, T
Storage temperature range, T
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds260°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 affect device reliability.
2
stg
A
TLC5615C0°C to 70°C
TLC5615I-40°C to 85°C
(1)
-65°C to 150°C
UNIT
www.ti.com
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
RECOMMENDED OPERATING CONDITIONS
MINNOMMAXUNIT
Supply voltage, V
High-level digital input voltage, V
Low-level digital input voltage, V
Reference voltage, V
Load resistance, R
Operating free-air temperature, T
DD
IH
IL
to REFIN terminal22.048VDD-2V
ref
L
TLC5615C070°C
A
TLC5615I4085°C
ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range, VDD= 5 V ± 5%, V
STATIC DAC SPECIFICATIONS
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
Resolution10bits
Integral nonlinearity, end point adjusted (INL)V
Differential nonlinearity (DNL)V
E
Zero-scale error (offset error at zero scale)V
ZS
Zero-scale-error temperature coefficientV
E
Gain errorV
G
Gain-error temperature coefficientV
PSRR Power-supply rejection ratioSee
Zero scale80
Gain80
Analog full scale outputRL= 100 kΩ2V
(1)
The relative accuracy or integral nonlinearity (INL), sometimes referred to as linearity error, is the maximum deviation of the output
from the line between zero and full scale excluding the effects of zero code and full-scale errors (see text). Tested from code 3 to code
1024.
(2)
The differential nonlinearity (DNL), sometimes referred to as differential error, is the difference between the measured and ideal 1 LSB
amplitude change of any two adjacent codes. Monotonic means the output voltage changes in the same direction (or remains
constant) as a change in the digital input code. Tested from code 3 to code 1024.
(3)
Zero-scale error is the deviation from zero-voltage output when the digital input code is zero (see text).
(4)
Zero-scale-error temperature coefficient is given by: EZSTC = [EZS(T
(5)
Gain error is the deviation from the ideal output (V
(6)
Gain temperature coefficient is given by: EGTC = [EG(T
(7)
Zero-scale-error rejection ratio (EZS-RR) is measured by varying the VDDfrom 4.5 V to 5.5 V dc and measuring the proportion of this
signal imposed on the zero-code output voltage.
(8)
Gain-error rejection ratio (EG-RR) is measured by varying the VDDfrom 4.5 V to 5.5 V dc and measuring the proportion of this signal
imposed on the full-scale output voltage after subtracting the zero-scale change.
= 2.048 V,See
ref
= 2.048 V,See
ref
= 2.048 V,See
ref
= 2.048 V,See
ref
= 2.048 V,See
ref
= 2.048 V,See
ref
(7) (8)
) - EZS(T
min
max
)]/V
- 1 LSB) with an output load of 10 kΩ excluding the effects of the zero-scale error.
Settling time is the time for the output signal to remain within ±0.5 LSB of the final measured value for a digital input code change of
REFIN = 0.2 Vpp+ 2.048 Vdc30kHz
000 hex to 3FF hex or 3FF hex to 000 hex.
(2)
Reference feedthrough is measured at the DAC output with an input code = 000 hex and a V
PARAMETER MEASURMENT INFORMATION
= 2.048 V (unless otherwise noted)
ref
(2)
input = 2.048 Vdc + 1 Vppat 1 kHz.
ref
-80dB
Figure 1. Timing Diagram
5
www.ti.com
15
10
5
0
20
25
30
5
4.8 4.6 4.4 4.24
3.8 3.6 3.4 3.23
VDD = 5 V
V
REFIN
= 2.048 V
TA = 25°C
- Output Source Current - mA
I
O
VO - Output Pullup Voltage - V
8
6
2
0
0.1 0.20.40.6
- Output Sink Current - mA
10
14
16
0.81
4
12
18
20
0.30.50.70.91.1
1.2
VDD = 5 V
V
REFIN
= 2.048 V
TA = 25°C
I
O
VO - Output Pulldown Voltage - V
80
- Supply Current -
200
280
240
160
120
40
0
- 60 - 40 - 20 02040 6080 100 120 140
Aµ
t - Temperature - °C
VDD = 5 V
V
REFIN
= 2.048 V
TA = 25°C
I
DD
11001 k10 k100 k
G - Relative Gain - dB
4
2
0
- 2
- 4
- 6
- 8
- 10
- 12
- 14
VDD = 5 V
V
REFIN
= 0.2 V
PP
+ 2.048 V dc
TA = 25°C
fI - Input Frequency - Hz
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
OUTPUT SINK CURRENTOUTPUT SOURCE CURRENT
vsvs
OUTPUT PULLDOWN VOLTAGEOUTPUT PULLUP VOLTAGE
TYPICAL CHARACTERISTICS
SUPPLY CURRENTRELATIVE GAIN
TEMPERATUREINPUT FREQUENCY
6
Figure 2.
V
REFIN
vsvs
Figure 4.
Figure 3.
TO V
(OUT)
Figure 5.
www.ti.com
40
50
1 k
Signal-To-Noise + Distortion - dB
70
30
Frequency - Hz
20
10
0
60
10 k100 k300 k
VDD = 5 V
T
A
= 25°C
V
REFIN
= 4 V
PP
Differential Nonlinearity – LSB
–0.2
0.2
0.1
0
–0.05
0.15
0.05
–0.1
–0.15
Input Code
25551176710230
Integral Nonlinearity – LSB
–0.6
Input Code
1
0
–0.2
25551176710230
0.8
0.6
0.4
0.2
–0.4
–0.8
–1
TYPICAL CHARACTERISTICS (continued)
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
SIGNAL-TO-NOISE + DISTORTION
vs
INPUT FREQUENCY AT REFIN
Figure 6.
Figure 7 Differential Nonlinearity With Input Code
Figure 8 Integral Nonlinearity With Input Code
7
www.ti.com
_
+
Resistor
String
DAC
5 V
0.1 µF
AGNDV
DD
OUT
REFIN
DIN SCLKCS
DOUT
R
R
_
+
2V
REFIN
1023
1024
2V
REFIN
513
1024
2V
REFIN
512
1024
V
REFIN
2V
REFIN
511
1024
2V
REFIN
1
1024
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
APPLICATION INFORMATION
GENERAL FUNCTION
The TLC5615 uses a resistor string network buffered with an op amp in a fixed gain of 2 to convert 10-bit digital
data to analog voltage levels (see functional block diagram and Figure 9). The output of the TLC5615 is the
same polarity as the reference input (see Table 1).
An internal circuit resets the DAC register to all zeros on power up.
Figure 9. TLC5615 Typical Operating Circuit
Table 1. Binary Code Table (0 V to 2 V
(1)
INPUT
1111111111(00)
::
1000000001(00)
1000000000(00)
0111111111(00)
::
0000000001(00)
0000000000(00)0 V
(1)
A 10-bit data word with two bits below the LSB bit (sub-LSB) with 0 values must be written since the DAC input latch is 12 bits wide.
BUFFER AMPLIFIER
Output),Gain = 2
REFIN
OUTPUT
The output buffer has a rail-to-rail output with short circuit protection and can drive a 2-kΩ load with a 100-pF
load capacitance. Settling time is 12.5 µs typical to within 0.5 LSB of final value.
8
www.ti.com
f
(SCLK)max
1
t
wCH
t
wCL
t
p(CS)
16t
wCH
t
wCL
t
wCS
10 Data Bitsxx
12 Bits
MSBLSB2 Extra (Sub-LSB) Bits
x = don’t care
10 Data Bitsxx
16 Bits
MSBLSB2 Extra (Sub-LSB) Bits
4 Upper Dummy Bits
x = don’t care
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
EXTERNAL REFERENCE
The reference voltage input is buffered, which makes the DAC input resistance not code dependent. Therefore,
the REFIN input resistance is 10 MΩ and the REFIN input capacitance is typically 5 pF independent of input
code. The reference voltage determines the DAC full-scale output.
LOGIC INTERFACE
The logic inputs function with either TTL or CMOS logic levels. However, using rail-to-rail CMOS logic achieves
the lowest power dissipation. The power requirement increases by approximately 2 times when using TTL logic
levels.
SERIAL CLOCK AND UPDATE RATE
Figure 1 shows the TLC5615 timing. The maximum serial clock rate is:
or approximately 14 MHz. The digital update rate is limited by the chip-select period, which is:
and is equal to 820 ns which is a 1.21 MHz update rate. However, the DAC settling time to 10 bits of 12.5 µs
limits the update rate to 80 kHz for full-scale input step transitions.
SERIAL INTERFACE
When chip select (CS) is low, the input data is read into a 16-bit shift register with the input data clocked in most
significant bit first. The rising edge of the SLCK input shifts the data into the input register.
The rising edge of CS then transfers the data to the DAC register. When CS is high, input data cannot be
clocked into the input register. All CS transitions should occur when the SCLK input is low.
If the daisy chain (cascading) function (see daisy-chaining devices section) is not used, a 12-bit input data
sequence with the MSB first can be used as shown in Figure 10:
Figure 10. 12-Bit Input Data Sequence
or 16 bits of data can be transferred as shown in Figure 11 with the 4 upper dummy bits first.
Figure 11. 16-Bit Input Data Sequence
9
www.ti.com
SCLK
DIN
CS
DOUT
TLC5615
SK
SO
I/O
SI
Microwire
Port
NOTE A: The DOUT -SI connection is not required for writing to
the TLC5615 but may be used for verifying data
transfer if desired.
SCLK
DIN
CS
DOUT
TLC5615
SCK
MOSI
I/O
MISO
SPI/QSPI
Port
NOTE A: The DOUT -MISO connection is not required for writing to the
TLC5615 but may be used for verifying data transfer.
CPOL = 0, CPHA = 0
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
The data from DOUT requires 16 falling edges of the input clock and, therefore, requires an extra clock width.
When daisy chaining multiple TLC5615 devices, the data requires 4 upper dummy bits because the data transfer
requires 16 input-clock cycles plus one additional input-clock falling edge to clock out the data at the DOUT
terminal (see Figure 1).
The two extra (sub-LSB) bits are always required to provide hardware and software compatibility with 12-bit data
converter transfers.
The TLC5615 three-wire interface is compatible with the SPI, QSPI†, and Microwire serial standards. The
hardware connections are shown in Figure 12 and Figure 13.
The SPI and Microwire interfaces transfer data in 8-bit bytes, therefore, two write cycles are required to input
data to the DAC. The QSPI interface, which has a variable input data length from 8 to 16 bits, can load the DAC
input register in one write cycle.
Figure 12. Microwire Connection
Figure 13. SPI/QSPI Connection
DAISY-CHAINING DEVICES
DACs can be daisy-chained by connecting the DOUT terminal of one device to the DIN of the next device in the
chain, providing that the setup time, t
t
, plus the propagation delay time, t
su(DS)
The data at DIN appears at DOUT, delayed by 16 clock cycles plus one clock width. DOUT is a totem-poled
output for low power. DOUT changes on the SCLK falling edge when CS is low. When CS is high, DOUT
remains at the value of the last data bit and does not go into a high-impedance state.
, (CS low to SCLK high) is greater than the sum of the setup time,
su(CSS)
pd(DOUT)
, for proper timing (see digital input timing requirements section).
10
www.ti.com
DAC Code
Output
Voltage
0 V
Negative
Offset
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
LINEARITY, OFSET, AND GAIN ERROR USING SINGLE ENDED SUPPLIES
When an amplifier is operated from a single supply, the voltage offset can still be either positive or negative. With
a positive offset, the output voltage changes on the first code change. With a negative offset the output voltage
may not change with the first code depending on the magnitude of the offset voltage.
The output amplifier attempts to drive the output to a negative voltage. However, because the most negative
supply rail is ground, the output cannot drive below ground and clamps the output at 0 V.
The output voltage then remains at zero until the input code value produces a sufficient positive output voltage to
overcome the negative offset voltage, resulting in the transfer function shown in Figure 14.
Figure 14. Effect of Negative Offset (Single Supply)
This offset error, not the linearity error, produces this breakpoint. The transfer function would have followed the
dotted line if the output buffer could drive below the ground rail.
For a DAC, linearity is measured between zero-input code (all inputs 0) and full-scale code (all inputs 1) after
offset and full scale are adjusted out or accounted for in some way. However, single supply operation does not
allow for adjustment when the offset is negative due to the breakpoint in the transfer function. So the linearity is
measured between full-scale code and the lowest code that produces a positive output voltage. For the
TLC5615, the zero-scale (offset) error is plus or minus 3 LSB maximum. The code is calculated from the
maximum specification for the negative offset.
POWER-SUPPLY BYPASSING AND GROUND MANAGEMENT
Printed-circuit boards that use separate analog and digital ground planes offer the best system performance.
Wire-wrap boards do not perform well and should not be used. The two ground planes should be connected
together at the low-impedance power-supply source. The best ground connection may be achieved by
connecting the DAC AGND terminal to the system analog ground plane making sure that analog ground currents
are well managed and there are negligible voltage drops across the ground plane.
A 0.1-µF ceramic-capacitor bypass should be connected between VDDand AGND and mounted with short leads
as close as possible to the device. Use of ferrite beads may further isolate the system analog supply from the
digital power supply.
Figure 15 shows the ground plane layout and bypassing technique.
11
www.ti.com
0.1 µF
Analog Ground Plane
1
2
3
4
8
7
6
5
TLC5615C, TLC5615I
SLAS142D–OCTOBER 1996 – REVISED AUGUST 2003
Figure 15. Power-Supply Bypassing
SAVING POWER
Setting the DAC register to all 0s minimizes power consumption by the reference resistor array and the output
load when the system is not using the DAC.
AC CONSIDERATIONS
Digital Feedthrough
Even with CS high, high-speed serial data at any of the digital input or output terminals may couple through the
DAC package internal stray capacitance and appear at the DAC analog output as digital feedthrough. Digital
feedthrough is tested by holding CS high and transmitting 0101010101 from DIN to DOUT.
Analog Feedthrough
Higher frequency analog input signals may couple to the output through internal stray capacitance. Analog
feedthrough is tested by holding CS high, setting the DAC code to all 0s, sweeping the frequency applied to
REFIN, and monitoring the DAC output.
12
MECHANICAL DATA
MPDI001A – JANUARY 1995 – REVISED JUNE 1999
P (R-PDIP-T8)PLASTIC DUAL-IN-LINE
0.400 (10,60)
0.355 (9,02)
8
5
0.260 (6,60)
0.240 (6,10)
1
0.021 (0,53)
0.015 (0,38)
NOTES: A. All linear dimensions are in inches (millimeters).
B. This drawing is subject to change without notice.
C. Falls within JEDEC MS-001
4
0.070 (1,78) MAX
0.020 (0,51) MIN
0.200 (5,08) MAX
0.125 (3,18) MIN
0.100 (2,54)
0.010 (0,25)
Seating Plane
M
0.325 (8,26)
0.300 (7,62)
0.015 (0,38)
Gage Plane
0.010 (0,25) NOM
0.430 (10,92)
MAX
4040082/D 05/98
For the latest package information, go to http://www.ti.com/sc/docs/package/pkg_info.htm
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty . Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
ProductsApplications
Amplifiersamplifier.ti.comAudiowww.ti.com/audio
Data Convertersdataconverter.ti.comAutomotivewww.ti.com/automotive
DSPdsp.ti.comBroadbandwww.ti.com/broadband
Interfaceinterface.ti.comDigital Controlwww.ti.com/digitalcontrol
Logiclogic.ti.comMilitarywww.ti.com/military
Power Mgmtpower.ti.comOptical Networkingwww.ti.com/opticalnetwork
Microcontrollersmicrocontroller.ti.comSecuritywww.ti.com/security
Telephonywww.ti.com/telephony
Video & Imagingwww.ti.com/video
Wirelesswww.ti.com/wireless
Mailing Address:Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
Loading...
+ hidden pages
You need points to download manuals.
1 point = 1 manual.
You can buy points or you can get point for every manual you upload.