LINER LTC8043 Serial 12-bit multiplying dac in so-8 Datasheet

LTC8043
Serial 12-Bit Multiplying
DAC in SO-8
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DESCRIPTION
FEATURES
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The LTC®8043 is a serial-input 12-bit multiplying digitalto-analog converter (DAC). It is a superior pin compatible
replacement for the DAC-8043. Improvements include
better accuracy, better stability over temperature and
supply variations, lower sensitivity to output amplifier
offset, tighter timing specifications and lower output capacitance.
Improved Direct Replacement for DAC-8043 and
MAX543
SO-8 Package
DNL and INL Over Temperature: ±0.5LSB
Easy, Fast and Flexible Serial Interface
±1LSB Maximum Gain Error
4-Quadrant Multiplication
Low Power Consumption
Low Cost
An easy-to-use 3-wire serial interface is well-suited to
remote or isolated applications
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APPLICATIONS
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The LTC8043 is extremely versatile. It can be used for
2-quadrant and 4-quadrant multiplying, programmable
gain and single supply applications, such as noninverting
voltage output mode.
Process Control and Industrial Automation
Remote Microprocessor-Controlled Systems
Digitally Controlled Filters and Power Supplies
Programmable Gain Amplifiers
Automatic Test Equipment
Parts are available in 8-pin SO and PDIP packages and are
specified over the extended industrial temperature range,
– 40°C to 85°C.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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TYPICAL APPLICATION
Integral Nonlinearity Over Temperature
SO-8 Multiplying DAC Has Easy 3-Wire Serial Interface
1.0
5V
8
CLOCK
DATA
LOAD
7
6
5
1
2
VDD VREF
RFB
33pF
CLK
SRI
LTC8043
LD
IOUT
3
–
®
LT 1097
GND
4
+
VOUT
INTEGRAL NONLINERARITY (LSB)
VIN
TA = 85°C
0.5
TA = 25°C
0
TA = –40°C
–0.5
LTC8043 • TA01
–1.0
0
512 1024 1536 2048 2560 3072 3584 4095
DIGITAL INPUT CODE
LTC8043 • TPC02
1
LTC8043
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W
U
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W W
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ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
VDD to GND................................................. – 0.5V to 7V
Digital Inputs to GND .................. – 0.5V to (VDD + 0.5V)
VIOUT to GND ............................... – 0.5V to (VDD + 0.5V)
VREF to GND.......................................................... ±25V
VRFB to GND .......................................................... ±25V
Maximum Junction Temperature .......................... 150°C
Operating Temperature Range ............... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
TOP VIEW
VREF
1
8
VDD
RFB
2
7
CLK
IOUT
3
6
SRI
GND
4
5
LD
N8 PACKAGE
8-LEAD PDIP
LTC8043EN8
LTC8043FN8
LTC8043ES8
LTC8043FS8
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
Consult factory for Military grade parts.
ACCURACY CHARACTERISTICS
VDD = 5V, VREF = 10V, VIOUT = GND = 0V, TA = TMIN to TMAX, unless otherwise specified.
SYMBOL PARAMETER
INL
DNL
GE
Resolution
Integral Nonlinearity
Differential Nonlinearity
Gain Error
ILKG
Gain Temperature Coefficient
(∆Gain/∆Temp)
Output Leakage Current
CONDITIONS
MIN
●
(Note 1)
Guaranteed Monotonic, TMIN to TMAX
(Note 2)
TA = 25°C
TMIN to TMAX
(Note 3)
(Note 4)
TA = 25°C
TMIN to TMAX
TA = 25°C
TMIN to TMAX
Zero-Scale Error
PSRR
Power Supply Rejection Ratio VDD = 5V ±5%
LTC8043E
TYP
MAX
12
LTC8043F
TYP
MAX
12
●
●
●
●
MIN
1
±0.5
±0.5
±1
±2
5
1
±1
±1
±2
±2
5
UNITS
Bits
LSB
LSB
LSB
LSB
ppm/°C
●
±5
±25
±0.03
±0.15
±5
±25
±0.03
±0.15
nA
nA
LSB
LSB
●
±0.0001 ±0.002
±0.0001 ±0.002
%/%
●
ELECTRICAL CHARACTERISTICS
VDD = 5V, VREF = 10V, VIOUT = GND = 0V, TA = TMIN to TMAX, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
ALL GRADES
TYP
MAX
UNITS
Reference Input
RREF
VREF Input Resistance
(Note 5)
●
Output Current Settling Time
(Notes 6, 7)
Multiplying Feedthrough Error
7
11
15
kΩ
●
0.25
1
µs
VREF = ±10V, 10kHz Sinewave
●
0.7
1
mVP-P
Digital-to-Analog Glitch Energy
(Notes 6, 8)
●
2
20
nVSEC
Total Harmonic Distortion
(Note 9)
●
– 108
– 92
dB
Output Noise Voltage Density
(Note 10)
●
17
nV/√Hz
DAC Register Loaded to All 1s
●
60
90
pF
DAC Register Loaded to All 0s
●
30
60
pF
AC Performance (Note 3)
THD
Analog Outputs (Note 3)
COUT
2
Output Capacitance
LTC8043
ELECTRICAL CHARACTERISTICS
VDD = 5V, VREF = 10V, VIOUT = GND = 0V, TA = TMIN to TMAX, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN
ALL GRADES
TYP
MAX
UNITS
Digital Inputs
VIH
Digital Input High Voltage
●
VIL
Digital Input Low Voltage
●
IIN
Digital Input Current
VIN = 0V to VDD
●
CIN
Digital Input Capacitance
VIN = 0V,(Note 3)
●
2.4
V
0.001
0.8
V
±1
µA
8
pF
Timing Characteristics (Note 3)
tDS
Serial Input to Clock Setup Time
●
30
–5
ns
tDH
Serial Input to Clock Hold Time
●
60
25
ns
tSRI
Serial Input Data Pulse Width
●
80
ns
tCH
Clock Pulse Width High
●
80
ns
tCL
Clock Pulse Width Low
●
80
ns
tLD
Load Pulse Width
●
140
ns
tASB
LSB Clocked into Input Register
to Load DAC Register Time
●
0
ns
●
4.75
Power Supply
VDD
Supply Voltage
IDD
Supply Current
Digital Inputs = 0V or VDD
Digital Inputs = VIH or VIN
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: ±0.5LSB = ±0.012% of full scale.
Note 2: Using internal feedback resistor.
Note 3: Guaranteed by design, not subject to test.
Note 4: IOUT with DAC register loaded with all 0s.
Note 5: Typical temperature coefficient is 100ppm/°C.
Note 6: IOUT load = 100Ω in parallel with 13pF.
●
●
5
5.25
V
100
500
µA
µA
Note 7: To 0.01% for a full-scale change, measured from
falling edge of LD.
Note 8: VREF = 0V. DAC register contents changed from all 0s to all 1s or
from all 1s to all 0s.
Note 9: VREF = 6VRMS at 1kHz. DAC register loaded with all 1s.
Note 10: 10Hz to 100kHz between RFB and IOUT. Calculation from en =
√4KTRB where: K = Boltzmann constant (J/K°); R = resistance (Ω);
T = resistor temperature (°K); B = bandwidth (Hz).
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BLOCK DIAGRAM
20k
20k
20k
VREF 1
2 RFB
40k
40k
40k
40k
40k
40k
40k
10k
3 IOUT
VDD 8
4 GND
DECODER
BIT 1
(MSB)
5
LOAD
CLK 7
CLK
LD
BIT 2
BIT 3
BIT 4
DAC REGISTER
INPUT 12-BIT SHIFT REGISTER
BIT 12
(LSB)
IN
6 SRI
8043 BD
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC8043
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TI I G DIAGRA
tDH
tDS
tCL
tCH
CLK INPUT
tSRI
PREVIOUS
WORD
SRI
BIT 1
MSB
BIT 2
BIT 12
LSB
BIT 11
tASB
LD
tLD
8043TD01
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TYPICAL APPLICATIONS N
Unipolar Operation (2-Quadrant Multiplication)
VREF
–10V TO 10V
5V
0.1µF
7
µP
6
5
1
2
VDD VREF
RFB
8
Table 1. Unipolar Binary Code Table
33pF
CLK
SRI
–
IOUT 3
LTC8043
LD
+
GND
4
VOUT
LT1097
LTC8043 • TA03
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB
LSB
1111 1111 1111
1000 0000 0000
0000 0000 0001
0000 0000 0000
ANALOG OUTPUT
VOUT
–VREF (4095/4096)
–VREF (2048/4096) = –VREF/2
–VREF (1/4096)
0V
Bipolar Operation (4-Quadrant Multiplication)
0.1µF
7
µP
6
5
8
1
VDD VREF
2
RFB
LTC8043
Table 2. Bipolar Offset Binary Code Table
33pF
CLK
SRI
R3
20k
R2
20k
VREF
–10V TO 10V
5V
IOUT 3
LD
–
R1
10k
1/2 LT1112
+
GND
4
–
1/2 LT1112
VOUT
+
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
MSB
LSB
1111 1111 1111
1000 0000 0001
1000 0000 0000
0111 1111 1111
0000 0000 0000
ANALOG OUTPUT
VOUT
+VREF (2047/2048)
+VREF (1/2048)
0V
–VREF (1/2048)
–VREF (2048/2048) = –VREF
LTC8043 • TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
LTC1257
Complete Serial I/O VOUT 12-Bit DAC
5V to 15V Single Supply in 8-Pin SO and PDIP
LTC1451/LTC1452/LTC1453
Complete Serial I/O VOUT 12-Bit DACs
3V/5V Single Supply in 8-Pin SO and PDIP
LTC7541A
Parallel I/O Multiplying 12-Bit DAC
12-Bit Wide Input
LTC7543/LTC8143
Serial I/O Mulitplying 12-Bit DACs
Clear Pin and Serial Data Output (LTC8143)
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Linear Technology Corporation
COMMENTS
LT/GP 1195 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 ● FAX: (408) 434-0507 ● TELEX: 499-3977
 LINEAR TECHNOLOGY CORPORATION 1995
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