LTC7543/LTC8143
Improved Industry Standard
Serial 12-Bit Multiplying DACs
FEATURES
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DESCRIPTION
The LTC
®
7543/LTC8143 are serial-input 12-bit multiply-
ing digital-to-analog converters (DACs). They are superior
pin compatible replacements for the AD7543 and
DAC-8143. Improvements include better accuracy, better
stability over temperature and supply variations, lower
sensitivity to output amplifier offset, tighter timing speci-
fications and lower output capacitance.
An easy-to-use serial interface includes an asynchronous
CLEAR input for systems requiring initialization to a known
state. The LTC8143 has a serial data output to allow daisy-
chaining multiple DACs on a 3-wire interface bus.
These DACs are extremely versatile. They can be used for
2-quadrant and 4-quadrant multiplying, programmable
gain and single supply applications, such as noninverting
voltage output and biased or offset ground mode.
Parts are available in 16-pin PDIP and SO 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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Improved Direct Replacement for AD7543
and DAC-8143
Low Cost
DNL and INL Over Temperature:
±0.5LSB
Easy, Fast and Flexible Serial Interface
Daisy-Chain 3-Wire Interface for Multiple DAC
Systems (LTC8143)
1LSB Maximum Gain Error Over Temperature
Eliminates Adjustment
Asynchronous Clear Input for Initialization
Four-Quadrant Multiplication
Low Power Consumption
16-Pin PDIP and SO Packages
APPLICATIONS
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Process Control and Industrial Automation
Remote Microprocessor-Controlled Systems
Digitally Controlled Filters and Power Supplies
Programmable Gain Amplifiers
Automatic Test Equipment
TYPICAL APPLICATION
Multiplying DAC Has Easy 3-Wire Serial Interface
V
IN
5V
14
CLOCK
DATA
LOAD
4
7
5
15
16
33pF
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity Over Temperature
1.0
+
–
R
FB
V
DD
V
REF
1
OUT 1
STB1
LTC7543
SRI
LTC8143
LD1
OUT 2
2
DGND
AGND
12
3
0.5
T
A
= 85°C
0
T
A
= –40°C
–0.5
T
A
= 25°C
LT
®
1097
V
OUT
7543/8143 TA01
–1.0
0
512 1024 1536 2048 2560 3072 3584 4095
DIGITAL INPUT CODE
7543/8143 TA02
U
U
U
1
LTC7543/LTC8143
ABSOLUTE
MAXIMUM
RATINGS
V
DD
to AGND .............................................. – 0.5V to 7V
V
DD
to DGND .............................................. – 0.5V to 7V
AGND to DGND ............................................ V
DD
+ 0.5V
DGND to AGND ............................................ V
DD
+ 0.5V
Digital Inputs to DGND ............... – 0.5V to (V
DD
+ 0.5V)
V
OUT1
, V
OUT2
to AGND ................. – 0.5V to (V
DD
+ 0.5V)
V
REF
to AGND, DGND............................................
±25V
V
RFB
to AGND, DGND ...........................................
±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
PACKAGE/ORDER INFORMATION
TOP VIEW
OUT 1
OUT 2
AGND
STB1
LD1
NC (LTC7543)
SRO (LTC8143)
SRI
STB2
1
2
3
4
5
6
7
8
16 R
FB
15 V
REF
14 V
DD
13 CLR
12 DGND
11 STB4
10 STB3
9
LD2
ORDER PART
NUMBER
LTC7543GKN
LTC7543KN
LTC7543GKSW
LTC7543KSW
LTC8143EN
LTC8143FN
LTC8143ESW
LTC8143FSW
N PACKAGE
16-LEAD PDIP
SW PACKAGE
16-LEAD PLASTIC SO WIDE
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 130°C/ W (SW)
Consult factory for Military grade parts.
ACCURACY CHARACTERISTICS –
LTC7543
V
DD
= 5V, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = DGND =0V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.
SYMBOL PARAMETER
Resolution
INL
DNL
GE
Integral Nonlinearity
(Relative Accuracy)
Differential Nonlinearity
Gain Error
Gain Temperature Coefficient
(∆Gain/∆Temp)
I
LKG
Output Leakage Current
Zero-Scale Error
PSRR
Power Supply Rejection Ratio V
DD
= 5V
±5%
(Note 1)
Guaranteed Monotonic, T
MIN
to T
MAX
(Note 2)
(Note 3)
(Note 4)
T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
CONDITIONS
q
q
q
q
q
LTC7543GK
MIN TYP
MAX
12
±0.5
±0.5
±1
±1
1
5
±1
±10
±0.006
±0.06
±0.0001 ±0.002
LTC7543K
MIN
TYP
MAX
12
±0.5
±0.5
±2
±2
1
5
±1
±10
±0.006
±0.06
±0.0001 ±0.002
UNITS
Bits
LSB
LSB
LSB
LSB
ppm/°C
nA
nA
LSB
LSB
%/%
q
q
q
2
U
W
U
U
W W
W
LTC7543/LTC8143
ACCURACY CHARACTERISTICS –
LTC8143
V
DD
= 5V, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.
SYMBOL PARAMETER
Resolution
INL
DNL
GE
Integral Nonlinearity
(Relative Accuracy)
Differential Nonlinearity
Gain Error
Gain Temperature Coefficient
(∆Gain/∆Temp)
I
LKG
Output Leakage Current
Zero-Scale Error
PSRR
Power Supply Rejection Ratio V
DD
= 5V
±5%
(Note 1)
Guaranteed Monotonic, T
MIN
to T
MAX
(Note 2)
(Note 3)
(Note 4)
T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
CONDITIONS
q
q
q
q
q
LTC8143E
MIN TYP
MAX
12
±0.5
±0.5
±1
±2
1
5
±5
±25
±0.03
±0.15
±0.0001 ±0.002
LTC8143F
MIN
TYP
MAX
12
±1
±1
±2
±2
1
5
±5
±25
±0.03
±0.15
±0.0001 ±0.002
UNITS
Bits
LSB
LSB
LSB
LSB
ppm/°C
nA
nA
LSB
LSB
%/%
q
q
q
ELECTRICAL CHARACTERISTICS –
LTC7543/LTC8143
V
DD
= 5V, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.
LTC7543/LTC8143
ALL GRADES
MIN
TYP
MAX
q
SYMBOL PARAMETER
Reference Input
R
REF
V
REF
Input Resistance
Output Current Settling Time
Multiplying Feedthrough Error
Digital-to-Analog Glitch Energy
THD
Total Harmonic Distortion
Output Noise Voltage Density
Analog Outputs (Note 3)
C
OUT
Output Capacitance
CONDITIONS
(Note 5)
(Notes 6, 7)
V
REF
=
±10V,
10kHz Sinewave
(Notes 6, 8)
(Note 9)
(Note 10)
DAC Register Loaded to All 1s
DAC Register Loaded to All 0s
C
OUT1
C
OUT2
C
OUT1
C
OUT2
UNITS
kΩ
µs
mV
P-P
nV-sec
dB
nV/√Hz
pF
pF
pF
pF
V
8
11
0.25
0.8
2
– 108
15
1
2
20
– 92
13
AC Performance (Note 3)
q
q
q
q
q
q
q
q
q
60
20
30
50
2.4
90
60
60
90
Digital Inputs
V
IH
V
IL
I
IN
C
IN
V
OH
V
OL
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Current
Digital Input Capacitance
Digital Output High
Digital Output Low
V
IN
= 0V to V
DD
(Note 3), V
IN
= 0V
I
OH
= – 200µA
I
OL
= 1.6mA
q
q
q
q
0.8
0.001
±1
8
4
0.4
V
µA
pF
V
V
Digital Outputs: SRO (LTC8143 Only)
q
q
3
LTC7543/LTC8143
ELECTRICAL CHARACTERISTICS –
LTC7543/LTC8143
V
DD
= 5V, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise specified.
LTC7543/LTC8143
ALL GRADES
MIN
TYP
MAX
q
q
q
q
q
q
q
q
q
SYMBOL
t
DS1
t
DS2
t
DS3
t
DS4
t
DH1
t
DH2
t
DH3
t
DH4
t
SRI
PARAMETER
Serial Input to Strobe Setup Time
(t
STB
= 80ns)
CONDITIONS
STB1 Used as the Strobe
STB2 Used as the Strobe
STB3 Used as the Strobe
STB4 Used as the Strobe
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Timing Characteristics (Note 3)
50
20
0
0
30
50
80
80
80
80
80
140
0
80
220
150
4.75
120
80
5
5.25
0.1
2
5
–5
– 30
– 30
10
25
55
55
Serial Input to Strobe Hold Time
(t
STB
= 80ns)
STB1 Used as the Strobe
STB2 Used as the Strobe
STB3 Used as the Strobe
STB4 Used as the Strobe
Serial Input Data Pulse Width
(Note 11)
(Note 12)
t
STB1
, t
STB2
, Strobe Pulse Width
t
STB3
, t
STB4
t
STB1
, t
STB2
, Strobe Pulse Width
t
STB3
, t
STB4
t
LD1
, t
LD2
t
ASB
t
CLR
t
PD
t
PD1
Power Supply
V
DD
I
DD
Supply Voltage
Supply Current
Load Pulse Width
LSB Strobed into Input Register
to Load DAC Register Time
Clear Pulse Width
STB2, STB3, STB4 Strobe to SRO
Propagation Delay
STB1 to SRO Propagation Delay
q
q
q
q
q
SRO Timing Characteristics (LTC8143 Only)
C
L
= 50pF
C
L
= 50pF
q
q
ns
ns
V
mA
mA
q
Digital Inputs = 0V or V
DD
Digital Inputs = V
IH
or V
IL
q
q
The
q
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:
I
OUT1
with DAC register loaded with all 0s or I
OUT2
with DAC
register loaded with all 1s.
Note 5:
Typical temperature coefficient is 100ppm/°C.
Note 6:
OUT 1 load = 100Ω in parallel with 13pF.
Note 7:
To 0.01% for a full-scale change, measured from falling edge of
LD1 or LD2.
Note 8:
V
REF
= 0V. DAC register contents changed from all 0s to all 1s or
from all 1s to all 0s.
Note 9:
V
REF
= 6V
RMS
at 1kHz. DAC register loaded with all 1s.
Note 10:
Calculation from e
n
=
√4KTRB
where: K = Boltzmann constant
(J/K°); R = resistance (Ω); T = resistor temperature (°K); B = bandwidth
(Hz).
Note 11:
Minimum high time for STB1, STB2, STB4. Minimum low time
for STB3.
Note 12.
Minimum low time for STB1, STB2, STB4. Minimum high time
for STB3.
4
LTC7543/LTC8143
BLOCK DIAGRAM
CLR 13
LD1 5
LD2 9
STB1 4
STB2 8
STB3 10
STB4 11
TI I G DIAGRA
STROBE INPUT
STB1, STB2, STB4
(INVERT FOR STB3)
SRI
PREVIOUS
WORD
LD1, LD2
SRO
(LTC8143 ONLY)
BIT 1 (MSB)
PREVIOUS WORD
W
W
20k
V
REF
15
40k
40k
40k
40k
40k
40k
40k
10k
20k
20k
16 R
FB
1 OUT 1
V
DD
14
DECODER
2 OUT 2
3 AGND
CLR
LOAD
BIT 1
(MSB)
BIT 2
BIT 3
DAC REGISTER
BIT 4
BIT 12
(LSB)
CLK
OUT
INPUT 12-BIT SHIFT REGISTER
IN
7 SRI
6 SRO
LTC8143 ONLY
DGND 12
7543/8143 BD
UW
t
DS1
t
DS2
t
DS3
t
DS4
t
DH1
t
DH2
t
DH3
t
DH4
t
STB1
t
STB2
t
STB3
t
STB4
t
STB1
t
STB2
t
STB3
t
STB4
t
SRI
BIT 1
MSB
BIT 2
BIT 11
BIT 12
LSB
t
ASB
t
LD1
t
LD2
t
PD
t
PD1
BIT 1 (MSB)
CURRENT WORD
BIT 2
BIT 3
BIT 12
LSB
7543/8143 TD01
5
RF/无线
