SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
D Buffered High-Impedance Reference Input
D Voltage Output Range . . . 2 Times the
features
D 10-Bit Voltage Output DAC
D Programmable Settling Time vs Power
D
D
D
D
Reference Input Voltage
D Monotonic Over Temperature
D Available in MSOP Package
Consumption
3 µs in Fast Mode
9 µs in Slow Mode
Ultra Low Power Consumption:
900 µW Typ in Slow Mode at 3 V
2.1 mW Typ in Fast Mode at 3 V
Differential Nonlinearity . . . <0.2 LSB Typ
Compatible With TMS320 and SPI Serial
Ports
Power-Down Mode (10 nA)
applications
D
D
D
D
D
Digital Servo Control Loops
Digital Offset and Gain Adjustment
Industrial Process Control
Machine and Motion Control Devices
Mass Storage Devices
D OR DGK PACKAGE
(TOP VIEW)
description
The TLV5606 is a 10-bit voltage output digital-toanalog converter (DAC) with a flexible 4-wire
serial interface. The 4-wire serial interface allows
glueless interface to TMS320, SPI, QSPI, and
Microwire serial ports. The TLV5606 is programmed with a 16-bit serial string containing 4
control and 10 data bits. Developed for a wide
range of supply voltages, the TLV5606 can
operate from 2.7 V to 5.5 V.
DIN
SCLK
CS
FS
1
8
2
7
3
6
4
5
VDD
OUT
REFIN
AGND
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 settling time of the DAC is programmable to allow
the designer to optimize speed versus power dissipation. The settling time is chosen by the control bits within
the 16-bit serial input string. A high-impedance buffer is integrated on the REFIN terminal to reduce the need
for a low source impedance drive to the terminal.
Implemented with a CMOS process, the TLV5606 is designed for single supply operation from 2.7 V to 5.5 V.
The device is available in an 8-terminal SOIC package. The TLV5606C is characterized for operation from 0°C
to 70°C. The TLV5606I is characterized for operation from − 40°C to 85°C.
AVAILABLE OPTIONS
PACKAGE
TA
SMALL OUTLINE†
(D)
0°C to 70°C
TLV5606CD
−40°C to 85°C
TLV5606ID
MSOP†
(DGK)
TLV5606CDGK
TLV5606IDGK
† Available in tape and reel as the TLV5606CDR, TLV5606IDR,
TLV5606CDGKR, and the TLV5606IDGKR
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.
Copyright 2002−2004, Texas Instruments Incorporated
!"# $ %&'# "$ (&)*%"# +"#'
+&%#$ %! # $('%%"#$ (' #,' #'!$ '-"$ $#&!'#$
$#"+"+ .""#/ +&%# (%'$$0 +'$ # '%'$$"*/ %*&+'
#'$#0 "** (""!'#'$
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1
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
functional block diagram
_
6
+
REFIN
12
Serial Input
Register
1
DIN
10
10-Bit
Data
Latch
2
SCLK
16 Cycle
Timer
3
CS
4
FS
10
x2
7
OUT
Update
2
Power-On
Reset
Speed/Power-Down
Logic
Terminal Functions
TERMINAL
NAME
2
NO.
I/O
DESCRIPTION
AGND
5
Analog ground
CS
3
I
Chip select. Digital input used to enable and disable inputs, active low.
DIN
1
I
Serial digital data input
FS
4
I
Frame sync. Digital input used for 4-wire serial interfaces such as the TMS320 DSP interface.
OUT
7
O
DAC analog output
REFIN
6
I
Reference analog input voltage
SCLK
2
I
Serial digital clock input
VDD
8
Positive power supply
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SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage (VDD to AGND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Reference input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.3 V to VDD + 0.3 V
Digital input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . − 0.3 V to VDD + 0.3 V
Operating free-air temperature range, TA: TLV5606C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
TLV5606I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40°C to 85°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† 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.
recommended operating conditions
Supply voltage, VDD
VDD = 5 V
VDD = 3 V
High-level digital input voltage, VIH
DVDD = 2.7 V
DVDD = 5.5 V
Low-level digital input voltage, VIL
DVDD = 2.7 V
DVDD = 5.5 V
Reference voltage, Vref to REFIN terminal
Reference voltage, Vref to REFIN terminal
MIN
NOM
MAX
4.5
5
5.5
V
2.7
3
3.3
V
2
V
2.4
VDD = 5 V (see Note 1)
VDD = 3 V (see Note 1)
V
AGND
2.048
AGND
1.024
2
10
Load resistance, RL
UNIT
0.6
V
1
V
VDD −1.5
VDD −1.5
V
V
kΩ
Load capacitance, CL
100
pF
Clock frequency, fCLK
20
MHz
0
70
°C
−40
85
°C
Operating free-air temperature, TA
TLV5606C
TLV5606I
NOTE 1: Due to the x2 output buffer, a reference input voltage ≥ VDD/2 causes clipping of the transfer function.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
power supply
PARAMETER
IDD
TEST CONDITIONS
VDD = 5 V, VREF = 2.048 V,
No load,
All inputs = AGND or VDD,
DAC latch = 0x800
Power supply current
VDD = 3 V, VREF = 1.024 V
No load,
All inputs = AGND or VDD,
DAC latch = 0x800
MIN
TYP
MAX
UNIT
Fast
0.9
1.35
mA
Slow
0.4
0.6
mA
Fast
0.7
1.1
mA
Slow
0.3
0.45
mA
Power down supply current (see Figure 12)
PSRR
Power supply rejection ratio
10
Zero scale
See Note 2
−80
Full scale
See Note 3
−80
Power on threshold voltage, POR
2
nA
dB
V
NOTES: 2. Power supply rejection ratio at zero scale is measured by varying VDD and is given by:
PSRR = 20 log [(EZS(VDDmax) − EZS(VDDmin))/VDDmax]
3. Power supply rejection ratio at full scale is measured by varying VDD and is given by:
PSRR = 20 log [(EG(VDDmax) − EG(VDDmin))/VDDmax]
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3
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted) (continued)
static DAC specifications RL = 10 kΩ, CL = 100 pF
PARAMETER
TEST CONDITIONS
MIN
TYP
Resolution
MAX
UNIT
10
10
bits
INL
Integral nonlinearity
See Note 4
± 0.5
± 1.5
LSB
DNL
Differential nonlinearity
See Note 5
± 0.2
±1
LSB
EZS
Zero-scale error (offset error at zero scale)
See Note 6
Zero-scale-error temperature coefficient
See Note 7
Gain error
See Note 8
Gain-error temperature coefficient
See Note 9
EG
± 10
10
mV
ppm/°C
± 0.6
10
% of
FS
voltage
ppm/°C
NOTES: 4. 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. Tested from code 10 to code 1023.
5. 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 10 to code 1023.
6. Zero-scale error is the deviation from zero voltage output when the digital input code is zero.
7. Zero-scale-error temperature coefficient is given by: EZS TC = [EZS (Tmax) − EZS (Tmin)]/Vref × 106/(Tmax − Tmin).
8. Gain error is the deviation from the ideal output (2Vref − 1 LSB) with an output load of 10 kΩ excluding the effects of the zero-error.
9. Gain temperature coefficient is given by: EG TC = [EG(Tmax) − EG (Tmin)]/Vref × 106/(Tmax − Tmin).
output specifications
PARAMETER
VO
Voltage output range
Output load regulation accuracy
TEST CONDITIONS
MIN
RL = 10 kΩ
TYP
0
RL = 2 kΩ, vs 10 kΩ
MAX
AVDD−0.1
±0.25
0.1
UNIT
V
% of FS
voltage
reference input (REF)
PARAMETER
VI
RI
Input voltage range
CI
Input capacitance
TEST CONDITIONS
MIN
TYP
0
MAX
VDD−1.5
Input resistance
10
Slow
Reference input bandwidth
REFIN = 0.2 Vpp + 1.024 V dc
Reference feed through
REFIN = 1 Vpp at 1 kHz + 1.024 V dc (see Note 10)
UNIT
V
MΩ
5
pF
525
kHz
1.3
MHz
−75
dB
Fast
NOTE 10: Reference feedthrough is measured at the DAC output with an input code = 0x000.
digital inputs
PARAMETER
IIH
IIL
High-level digital input current
CI
Input capacitance
4
Low-level digital input current
TEST CONDITIONS
MIN
TYP
VI = VDD
VI = 0 V
3
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MAX
UNIT
±1
µA
±1
µA
pF
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
operating characteristics over recommended operating free-air temperature range (unless
otherwise noted)
analog output dynamic performance
PARAMETER
TEST CONDITIONS
ts(FS)
Output settling time, full scale
RL = 10 kΩ,
See Note 11
CL = 100 pF,
ts(CC)
Output settling time, code to code
RL = 10 kΩ,
See Note 12
CL = 100 pF,
SR
S/N
Slew rate
RL = 10 kΩ,
See Note 13
CL = 100 pF,
Glitch energy
Code transition from 0x7FF to 0x800
MIN
TYP
MAX
Fast
3
5.5
Slow
9
20
Fast
1
µs
Slow
2
µs
Fast
3.6
Slow
0.9
Signal to noise
S/(N+D)
Signal to noise + distortion
THD
Total harmonic distortion
fs = 400 KSPS fout = 1.1 kHz,
RL = 10 kΩ,
CL = 100 pF,
kΩ
BW = 20 kHz
Spurious free dynamic range
UNIT
µss
V/ s
V/µs
10
nV−s
62
dB
60
dB
−61
dB
68
dB
NOTES: 11. 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 0x080 to 0x3FF or 0x3FF to 0x080. Not tested, ensured by design.
12. 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 one count. Code change from 0x1FF to 0x200. Not tested, ensured by design.
13. Slew rate determines the time it takes for a change of the DAC output from 10% to 90% full-scale voltage.
digital input timing requirements
MIN
tsu(CS−FS)
tsu(FS−CK)
Setup time, CS low before FS↓
Setup time, FS low before first negative SCLK edge
NOM
MAX
UNIT
10
ns
8
ns
tsu(C16−FS)
Setup time, sixteenth negative edge after FS low on which bit D0 is sampled before rising
edge of FS
10
ns
tsu(C16−CS)
Setup time, sixteenth positive SCLK edge (first positive after D0 is sampled) before CS rising
edge. If FS is used instead of the sixteenth positive edge to update the DAC, then the setup
time is between the FS rising edge and CS rising edge.
10
ns
twH
twL
Pulse duration, SCLK high
25
ns
Pulse duration, SCLK low
25
ns
tsu(D)
Setup time, data ready before SCLK falling edge
8
ns
th(D)
twH(FS)
Hold time, data held valid after SCLK falling edge
5
ns
20
ns
Pulse duration, FS high
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5
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
PARAMETER MEASUREMENT INFORMATION
ÎÎÎÎÎ
ÎÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
SCLK
1
2
tsu(D)
DIN
twH
twL
3
4
5
15
16
th(D)
D15
D14
D13
D12
tsu(FS-CK)
D1
D0
tsu(C16-CS)
tsu(CS-FS)
CS
twH(FS)
tsu(C16-FS)
FS
Figure 1. Timing Diagram
6
ÎÎÎ
ÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
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SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
TYPICAL CHARACTERISTICS
OUTPUT VOLTAGE
vs
LOAD CURRENT
OUTPUT VOLTAGE
vs
LOAD CURRENT
2.004
3 V Fast Mode, SOURCE
1.998
1.996
1.994
5 V Slow Mode, SOURCE
4.005
VO − Output Voltage − V
VO − Output Voltage − V
2.002
2
4.01
VDD = 3 V,
Vref = 1 V,
Full Scale
3 V Slow Mode, SOURCE
1.992
4
5 V Fast Mode, SOURCE
3.995
3.99
3.985
3.98
1.990
3.975
0
0.01 0.02 0.05 0.1
0.2
0.5
1
2
0
Load Current − mA
0.02 0.04 0.1 0.2 0.4
1
Load Current − mA
Figure 2
2
4
Figure 3
OUTPUT VOLTAGE
vs
LOAD CURRENT
OUTPUT VOLTAGE
vs
LOAD CURRENT
0.2
0.35
VDD = 3 V,
Vref = 1 V,
Zero Code
0.18
VDD = 5 V,
Vref = 2 V,
Zero Code
0.3
0.16
0.14
VO − Output Voltage − V
VO − Output Voltage − V
VDD = 5 V,
Vref = 2 V,
Full Scale
3 V Slow Mode, SINK
0.12
0.1
0.08
3 V Fast Mode, SINK
0.06
0.25
5 V Slow Mode, SINK
0.2
0.15
5 V Fast Mode, SINK
0.1
0.04
0.05
0.02
0
0
0
0.01 0.02 0.05 0.1 0.2 0.5
Load Current − mA
1
2
0
Figure 4
0.02 0.04
0.1 0.2 0.4
1
Load Current − mA
2
4
Figure 5
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7
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
TYPICAL CHARACTERISTICS
SUPPLY CURRENT
vs
FREE-AIR TEMPERATURE
SUPPLY CURRENT
vs
FREE-AIR TEMPERATURE
1
1
VDD = 5 V,
Vref = 2 V,
Full Scale
I DD − Supply Current − mA
I DD − Supply Current − mA
VDD = 3 V,
Vref = 1 V,
Full Scale
0.8
Fast Mode
0.6
0.4
Fast Mode
0.8
0.6
0.4
Slow Mode
Slow Mode
0.2
−55 −40
85
−25
0
25
40
70
TA − Free-Air Temperature − C°
0.2
−55 −40
125
Figure 6
TOTAL HARMONIC DISTORTION
vs
FREQUENCY
0
0
Vref = 1 V dc + 1 V p/p Sinewave,
Output Full Scale
−10
THD − Total Harmonic Distortion − dB
THD − Total Harmonic Distortion − dB
125
Figure 7
TOTAL HARMONIC DISTORTION
vs
FREQUENCY
−20
−30
−−40
−50
−60
Fast Mode
−70
−80
0
5
10
20
30
50
100
f − Frequency − kHz
Vref = 1 V dc + 1 V p/p Sinewave,
Output Full Scale
−10
−20
−30
−−40
−50
−60
Slow Mode
−70
−80
0
5
10
20
30
f − Frequency − kHz
Figure 8
8
85
−25
0
25
40
70
TA − Free-Air Temperature − C°
Figure 9
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50
100
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
TYPICAL CHARACTERISTICS
Vref = 1 V dc + 1 V p/p Sinewave,
Output Full Scale
−10
TOTAL HARMONIC DISTORTION AND NOISE
vs
FREQUENCY
THD − Total Harmonic Distortion And Noise − dB
0
−20
−30
−−40
−50
Fast Mode
−60
−70
−80
0
Vref = 1 V dc + 1 V p/p Sinewave,
Output Full Scale
−10
−20
−30
−−40
−50
Slow Mode
−60
−70
−80
0
5
10
30
20
50
100
0
5
f − Frequency − kHz
10
20
30
50
100
f − Frequency − kHz
Figure 10
Figure 11
SUPPLY CURRENT
vs
TIME (WHEN ENTERING POWER-DOWN MODE)
900
800
I DD − Supply Current − µ A
THD − Total Harmonic Distortion And Noise − dB
TOTAL HARMONIC DISTORTION AND NOISE
vs
FREQUENCY
700
600
500
400
300
200
100
0
0
100 200 300 400 500 600 700 800 900 1000
T − Time − ns
Figure 12
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9
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
TYPICAL CHARACTERISTICS
INL − Integral Nonlinearity − LSB
INTEGRAL NONLINEARITY ERROR
1.0
0.5
0.0
−0.5
−1.0
0
512
1024
Digital Code
Figure 13
DNL − Differential Nonlinearity − LSB
DIFFERENTIAL NONLINEARITY ERROR
0.20
0.16
0.12
0.08
0.04
0.00
−0.04
−0.08
−0.12
−0.16
−0.20
0
512
Digital Code
Figure 14
10
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1024
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
general function
The TLV5606 is a 10-bit single supply DAC based on a resistor string architecture. The device consists of a serial
interface, speed and power-down control logic, a reference input buffer, a resistor string, and a rail-to-rail output
buffer.
The output voltage (full scale determined by external reference) is given by:
2 REF CODE
[V]
2n
where REF is the reference voltage and CODE is the digital input value within the range of 010 to 2n−1, where
n = 10 (bits). The 16-bit data word, consisting of control bits and the new DAC value, is illustrated in the data
format section. A power-on reset initially resets the internal latches to a defined state (all bits zero).
serial interface
Explanation of data transfer: First, the device has to be enabled with CS set to low. Then, a falling edge of FS
starts shifting the data bit-per-bit (starting with the MSB) to the internal register on the falling edges of SCLK.
After 16 bits have been transferred or FS rises, the content of the shift register is moved to the DAC latch which
updates the voltage output to the new level.
The serial interface of the TLV5606 can be used in two basic modes:
D Four wire (with chip select)
D Three wire (without chip select)
Using chip select (four wire mode), it is possible to have more than one device connected to the serial port of
the data source (DSP or microcontroller). The interface is compatible with the TMS320 family. Figure 15 shows
an example with two TLV5606s connected directly to a TMS320 DSP.
TLV5606
CS FS DIN SCLK
TLV5606
CS FS DIN SCLK
TMS320
DSP
XF0
XF1
FSX
DX
CLKX
Figure 15. TMS320 Interface
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11
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
serial interface (continued)
If there is no need to have more than one device on the serial bus, then CS can be tied low. Figure 16 shows
an example of how to connect the TLV5606 to a TMS320, SPI, or Microwire port using only three pins.
TMS320
DSP
TLV5606
FSX
SPI
FS
DIN
DX
CLKX
TLV5606
FS
DIN
SS
MOSI
SCLK
SCLK
Microwire
FS
DIN
I/O
SO
SK
SCLK
CS
TLV5606
SCLK
CS
CS
Figure 16. Three-Wire Interface
Notes on SPI and Microwire: Before the controller starts the data transfer, the software has to generate a falling
edge on the I/O pin connected to FS. If the word width is 8 bits (SPI and Microwire), two write operations must
be performed to program the TLV5606. After the write operation(s), the DAC output is updated automatically
on the next positive clock edge following the sixteenth falling clock edge.
serial clock frequency and update rate
The maximum serial clock frequency is given by:
f
SCLKmax
+
t
wH(min)
1
)t
+ 20 MHz
wL(min)
The maximum update rate is:
f
UPDATEmax
+
1
ǒ wH(min) ) twL(min)Ǔ
+ 1.25 MHz
16 t
The maximum update rate is a theoretical value for the serial interface, since the settling time of the TLV5606
has to be considered also.
data format
The 16-bit data word for the TLV5606 consists of two parts:
D Control bits
D New DAC value
D15
D14
D13
D12
X
SPD
PWR
X
X: don’t care
SPD: Speed control bit.
PWR: Power control bit.
(D15 . . . D12)
(D11 . . . D2)
D11
1 → fast mode
1 → power down
D10
D9
D8
D7
D6
D5
New DAC value (10 bits)
0 → slow mode
0 → normal operation
In power-down mode, all amplifiers within the TLV5606 are disabled.
12
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D4
D3
D2
D1
D0
0
0
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
TLV5606 interfaced to TMS320C203 DSP
hardware interfacing
Figure 17 shows an example how to connect the TLV5606 to a TMS320C203 DSP. The serial interface of the
TLV5606 is ideally suited to this configuration, using a maximum of four wires to make the necessary
connections. In applications where only one synchronous serial peripheral is used, the interface can be
simplified even further by pulling CS low all the time as shown in the figure.
TMS320C203
TLV5606
FS
FS
DX
DIN
VDD
SCLK
CLKX
REF
OUT
REFIN
CS AGND
RLOAD
Figure 17. TLV5606 to DSP Interface
software
No setup procedure is needed to access the TLV5606. The output voltage can be set using just a single
command.
out
data_addr, SDTR
where data_addr points to an address location holding the control bits and the 12 data bits providing the output
voltage data. SDTR is the address of the transmit FIFO of the synchronous serial port.
The following code shows how to use the timer of the TMS320C203 as a time base to generate a voltage ramp
with the TLV5606.
A timer interrupt is generated every 205 µs. The corresponding interrupt service routine increments the output
code (stored at 0x0064) for the DAC, adds the DAC control bits to the four most significant bits, and writes the
new code to the TLV5606. The resulting period of the saw waveform is:
π = 4096 × 205 E-6 s = 0.84 s
;***************************************************************************************
;* Title
: Ramp generation with TLV5606
*
;* Version : 1.0
*
;* DSP
: TI TMS320C203
*
;* (1998) Texas Instruments Incorporated
*
;***************************************************************************************
;−−−−−−−−−−− I/O and memory mapped regs −−−−−−−−−−−−
.include ”regs.asm”
;−−−−−−−−−−− vectors −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
.ps
0h
b
start
b
INT1
b
INT23
b
TIM_ISR
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13
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
;***************************************************************************************
;* Main Program
;***************************************************************************************
.ps
1000h
.entry
start:
; disable interrupts
setc
INTM
; disable maskable interrupts
splk
#0ffffh, IFR
splk
#0004h, IMR
; set up the timer to interrupt ever 205uS
splk
#0000h, 60h
splk
#00FFh, 61h
out
61h, PRD
out
60h, TIM
splk
#0c2fh, 62h
out
62h, TCR
; Configure SSP to use internal clock, internal frame sync and burst mode
splk
#0CC0Eh, 63h
out
63h, SSPCR
splk
#0CC3Eh, 63h
out
63h, SSPCR
splk
#0000h, 64h ; set initial DAC value
; enable interrupts
clrc
INTM
; enable maskable interrupts
; loop forever!
next:
idle
b
next
;wait for interrupt
; all else fails stop here
done:
b
done
;hang there
;***************************************************************************************
;* Interrupt Service Routines
;***************************************************************************************
INT1:
ret
;do nothing and return
INT23:
ret
;do nothing and return
TIM_ISR:
lacl
add
and
sacl
or
sacl
out
64h
#4h
#0FFCh
64h
#4000h
65h
65h, SDTR
;
;
;
;
;
;
;
restore counter value to ACC
increment DAC value
mask 4 MSBs
store 12 bit counter value
set DAC control bits
store DAC value
send data
clrc
ret
intm
; re-enable interrupts
.END
14
WWW.TI.COM
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
TLV5606 interfaced to MCS51 microcontroller
hardware interfacing
Figure 18 shows an example of how to connect the TLV5606 to an MCS51 compatible microcontroller. The
serial DAC input data and external control signals are sent via I/O port 3 of the controller. The serial data is sent
on the RxD line, with the serial clock output on the TxD line. P3.4 and P3.5 are configured as outputs to provide
the chip select and frame sync signals for the TLV5606.
MCS51 Controller
TLV5606
RxD
SDIN
TxD
SCLK
P3.4
P3.5
CS
FS
VDD
OUT
REF
REFIN
RLOAD
AGND
Figure 18. TLV5606 to MCS51 Controller Interface
software
The example program puts out a sine wave on the OUT pin.
The on-chip timer is used to generate interrupts at a fixed frequency. The related interrupt service routine fetches
and writes the next sample to the DAC. The samples are stored in a lookup table, which describes one full period
of a sine wave.
The serial port of the controller is used in mode 0, which transmits 8 bits of data on RxD, accompanied by a
synchronous clock on TxD. Two writes concatenated together are required to write a complete word to the
TLV5606. The CS and FS signals are provided in the required fashion through control of I/O port 3, which has
bit addressable outputs.
;***************************************************************************************
;* Title
: Ramp generation with TLV5606
*
;* Version : 1.0
*
*
;* MCU
: INTEL MCS51
;* (1998) Texas Instruments Incorporated
*
;***************************************************************************************
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Program function declaration
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
NAME
GENSINE
MAIN
ISR
SINTBL
VAR1
STACK
SEGMENT
SEGMENT
SEGMENT
SEGMENT
SEGMENT
CODE
CODE
CODE
DATA
IDATA
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Code start at address 0, jump to start
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
CSEG AT
0
MCS is a registered trademark of Intel Corporation
WWW.TI.COM
15
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
LJMP
start
; Execution starts at address 0 on power−up.
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Code in the timer0 interrupt vector
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
CSEG AT 0BH
LJMP
timer0isr ; Jump vector for timer 0 interrupt is 000Bh
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Define program variables
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
RSEG
VAR1
rolling_ptr: DS 1
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Interrupt service routine for timer 0 interrupts
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
RSEG
ISR
timer0isr:
PUSH
PUSH
PSW
ACC
CLR
CLR
T0
;
;
;
;
T1
; set CSB low
; set FS low
The signal to be output on the dac is a sine function. One cycle of a sine wave is
held in a table @ sinevals as 32 samples of msb, lsb pairs (64 bytes). The pointer,
rolling_ptr, rolls round the table of samples incrementing by 2 bytes (1 sample) on
each interrupt (at the end of this routine).
MOV
MOV
DPTR,#sinevals ; set DPTR to the start of the table of sine signal values
A,rolling_ptr ; ACC loaded with the pointer into the sine table
MOVC
ORL
MOV
A,@A+DPTR
A, #00H
SBUF,A
; get msb from the table
; set control bits
; send out msb of data word
MOV A,rolling_ptr ; move rolling pointer in to ACC
INC
A
; increment ACC holding the rolling pointer
MOVC
A,@A+DPTR
; which is the lsb of this sample, now in ACC
MSB_TX:
JNB
CLR
MOV
TI, MSB_TX
TI
SBUF,A
; wait for transmit to complete
; clear for new transmit
; and send out the lsb
LSB_TX:
JNB
SETB
CLR
TI, LSB_TX
T1
TI
; wait for lsb transmit to complete
; set FS = 1
; clear for new transmit
MOV
INC
INC
ANL
MOV
A,rolling_ptr
A
A
A,#03FH
rolling_ptr,A
; load ACC with rolling pointer
; increment the ACC twice, to get next sample
SETB
T0
; CSB high
POP
POP
ACC
PSW
; wrap back round to 0 if >64
; move value held in ACC back to the rolling pointer
RETI
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Set up stack
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
16
WWW.TI.COM
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
RSEG
STACK
DS
10h
; 16 Byte Stack!
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Main Program
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
RSEG
start:
MOV
MAIN
SP,#STACK−1
; first set Stack Pointer
CLR
MOV
MOV
MOV
SETB
SETB
A
SCON,A
TMOD,#02H
TH0,#0C8H
T1
T0
;
;
;
;
;
SETB
SETB
ET0
EA
; enable timer 0 interrupts
; enable all interrupts
MOV
SETB
rolling_ptr,A
TR0
set
set
set
set
set
serial port 0 to mode 0
timer 0 to mode 2 − auto−reload
TH0 for 16.67 kHs interrupts
FS = 1
CSB = 1
; set rolling pointer to 0
; start timer 0
always:
SJMP
always
; while(1) !
RET
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
; Table of 32 sine wave samples used as DAC data
;−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
RSEG
SINTBL
sinevals:
DW
01000H
DW
0903CH
DW
05094H
DW
0305CH
DW
0B084H
DW
070C8H
DW
0F0E0H
DW
0F066H
DW
0F038H
DW
0F06CH
DW
0F0E0H
DW
070C8H
DW
0B084H
DW
0305CH
DW
05094H
DW
0903CH
DW
01000H
DW
06020H
DW
0A0E8H
DW
0C060H
DW
040F8H
DW
080B4H
DW
0009CH
DW
00050H
DW
00024H
DW
00050H
DW
0009CH
DW
080B4H
DW
040F8H
DW
0C060H
DW
0A0E8H
DW
06020H
END
WWW.TI.COM
17
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
linearity, offset, 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 19.
Output
Voltage
0V
DAC Code
Negative
Offset
Figure 19. 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.
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 VDD and 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 20 shows the ground plane layout and bypassing technique.
Analog Ground Plane
1
8
2
7
3
6
4
5
0.1 µF
Figure 20. Power-Supply Bypassing
18
WWW.TI.COM
SLAS259B − DECEMBER 1999 − REVISED APRIL 2004
APPLICATION INFORMATION
definitions of specifications and terminology
integral nonlinearity (INL)
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.
differential nonlinearity (DNL)
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.
zero-scale error (EZS)
Zero-scale error is defined as the deviation of the output from 0 V at a digital input value of 0.
gain error (EG)
Gain error is the error in slope of the DAC transfer function.
signal-to-noise ratio + distortion (S/N+D)
S/N+D is the ratio of the rms value of the output signal to the rms sum of all other spectral components below
the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels.
spurious free dynamic range (SFDR)
SFDR is the difference between the rms value of the output signal and the rms value of the largest spurious
signal within a specified bandwidth. The value for SFDR is expressed in decibels.
total harmonic distortion (THD)
THD is the ratio of the rms sum of the first six harmonic components to the rms value of the fundamental signal
and is expressed in decibels.
WWW.TI.COM
19
PACKAGE OPTION ADDENDUM
www.ti.com
18-Feb-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
TLV5606CD
ACTIVE
SOIC
D
8
75
Pb-Free
(RoHS)
CU NIPDAU
Level-2-260C-1YEAR/
Level-1-220C-UNLIM
TLV5606CDGK
ACTIVE
MSOP
DGK
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TLV5606CDGKR
ACTIVE
MSOP
DGK
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TLV5606CDR
ACTIVE
SOIC
D
8
2500
Pb-Free
(RoHS)
CU NIPDAU
Level-2-260C-1YEAR/
Level-1-220C-UNLIM
TLV5606ID
ACTIVE
SOIC
D
8
75
Pb-Free
(RoHS)
CU NIPDAU
Level-2-260C-1YEAR/
Level-1-220C-UNLIM
TLV5606IDGK
ACTIVE
MSOP
DGK
8
80
Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TLV5606IDGKR
ACTIVE
MSOP
DGK
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TLV5606IDGKRG4
ACTIVE
MSOP
DGK
8
2500 Green (RoHS &
no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
TLV5606IDR
ACTIVE
SOIC
D
8
2500
CU NIPDAU
Level-2-260C-1YEAR/
Level-1-220C-UNLIM
Pb-Free
(RoHS)
Lead/Ball Finish
MSL Peak Temp (3)
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional
product content details.
None: Not yet available Lead (Pb-Free).
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
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