1
LTC1595/LTC1596/LTC1596-1
Serial 16-Bit
Multiplying DACs
FEATURES
s
SO-8 Package (LTC1595)
s
DNL and INL: 1LSB Max
s
Low Glitch Impulse: 1nV-s Typ
s
Fast Settling to 1LSB: 2
µ
s (with LT1468)
s
Pin Compatible with Industry Standard
12-Bit DACs: DAC8043 and DAC8143/AD7543
s
4-Quadrant Multiplication
s
Low Supply Current: 10
µ
A Max
s
Power-On Reset
LTC1595/LTC1596: Resets to Zero Scale
LTC1596-1: Resets to Midscale
s
3-Wire SPI and MICROWIRE
TM
Compatible
Serial Interface
s
Daisy-Chain Serial Output (LTC1596)
s
Asynchronous Clear Input
LTC1596: Clears to Zero Scale
LTC1596-1: Clears to Midscale
DESCRIPTIO
N
U
The LTC
®
1595/LTC1596/LTC1596-1 are serial input,
16-bit multiplying current output DACs. The LTC1595 is
pin and hardware compatible with the 12-bit DAC8043 and
comes in 8-pin PDIP and SO packages. The LTC1596 is pin
and hardware compatible with the 12-bit DAC8143/AD7543
and comes in 16-pin PDIP and SO wide packages.
Both are specified over the industrial temperature range.
Sensitivity of INL to op amp V
OS
is reduced by five times
compared to the industry standard 12-bit DACs, so most
systems can be easily upgraded to true 16-bit resolution
and linearity without requiring more precise op amps.
These DACs include an internal deglitching circuit that
reduces the glitch impulse by more than ten times to less
than 1nV-s typ.
The DACs have a clear input and a power-on reset. The
LTC1595 and LTC1596 reset to zero scale. The LTC1596-1
is a version of the LTC1596 that resets to midscale.
MICROWIRE is a trademark of National Semiconductor Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
V
DD
V
REF
LTC1595
R
FB
GND
4
7
6
5
8
5V
V
IN
CLOCK
DATA
LOAD
CLK
SRI
LD
1
2
3
OUT1
33pF
V
OUT
1595/96 TA01
–
+
LT
®
1468
DIGITAL INPUT CODE
0
–1.0
INTEGRAL NONLINEARITY (LSB)
–0.6
– 0.8
–0.4
0.4
0.6
0.8
1.0
–0.2
0.2
0
16384
32768
1595/96 TA02
49152
65535
Integral Nonlinearity
SO-8 Multiplying 16-Bit DAC Has Easy 3-Wire Serial Interface
APPLICATIO
N
S
U
s
Process Control and Industrial Automation
s
Software Controlled Gain Adjustment
s
Digitally Controlled Filter and Power Supplies
s
Automatic Test Equipment
TYPICAL APPLICATIO
N
U
2
LTC1595/LTC1596/LTC1596-1
ABSOLUTE
M
AXI
M
U
M
RATINGS
W
W
W
U
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
V
REF
to AGND, DGND.............................................
±
25V
R
FB
to AGND, DGND ..............................................
±
25V
Digital Inputs to DGND ................ – 0.5V to (V
DD
+ 0.5V)
W
U
U
PACKAGE/ORDER I FOR ATIO
V
OUT1
, V
OUT2
to AGND ................. – 0.5V to (V
DD
+ 0.5V)
Maximum Junction Temperature .......................... 150
°
C
Operating Temperature Range
LTC1595C/LTC1596C/LTC1596-1C ........ 0
°
C to 70
°
C
LTC1595I/LTC1596I/LTC1596-1I ...... – 40
°
C to 85
°
C
Storage Temperature Range ................ – 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec)................. 300
°
C
1
2
3
4
5
6
7
8
TOP VIEW
SW PACKAGE
16-LEAD PLASTIC SO WIDE
N PACKAGE
16-LEAD PDIP
16
15
14
13
12
11
10
9
OUT1
OUT2
AGND
STB1
LD1
SRO
SRI
STB2
R
FB
V
REF
V
DD
CLR
DGND
STB4
STB3
LD2
T
JMAX
= 150
°
C,
θ
JA
= 100
°
C/W (N)
T
JMAX
= 150
°
C,
θ
JA
= 130
°
C/W (SW)
ORDER PART NUMBER
LTC1596-1AIN
LTC1596-1AISW
LTC1596-1BIN
LTC1596-1BISW
LTC1596-1CIN
LTC1596-1CISW
LTC1596-1ACN
LTC1596-1ACSW
LTC1596-1BCN
LTC1596-1BCSW
LTC1596-1CCN
LTC1596-1CCSW
LTC1596AIN
LTC1596AISW
LTC1596BIN
LTC1596BISW
LTC1596CIN
LTC1596CISW
LTC1596ACN
LTC1596ACSW
LTC1596BCN
LTC1596BCSW
LTC1596CCN
LTC1596CCSW
1
2
3
4
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
8
7
6
5
V
REF
R
FB
OUT1
GND
V
DD
CLK
SRI
LD
T
JMAX
= 150
°
C,
θ
JA
= 130
°
C/W (N)
T
JMAX
= 150
°
C,
θ
JA
= 190
°
C/W (S)
ELECTRICAL CHARACTERISTICS
V
DD
= 5V
±
10%, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
LTC1595AIN8
LTC1595AIS8
LTC1595BIN8
LTC1595BIS8
LTC1595CIN8
LTC1595CIS8
LTC1595ACN8
LTC1595ACS8
LTC1595BCN8
LTC1595BCS8
LTC1595CCN8
LTC1595CCS8
ORDER PART NUMBER
S8 PART MARKING
1595A
1595B
1595C
1595AI
1595BI
1595CI
Consult factory for Military grade parts.
LTC1595C/96C/96-1C
LTC1595B/96B/96-1B
LTC1595A/96A/96-1A
(Note 1)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Accuracy
Resolution
q
16
16
16
Bits
Monotonicity
q
16
16
15
Bits
INL
Integral Nonlinearity
(Note 2) T
A
= 25
°
C
±
0.25
±
1
±
2
±
4
LSB
T
MIN
to T
MAX
q
±
0.35
±
1
±
2
±
4
LSB
3
LTC1595/LTC1596/LTC1596-1
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
V
DD
= 5V
±
10%, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Gain Temperature Coefficient
(Note 4)
∆
Gain/
∆
Temperature
q
1
2
ppm/
°
C
I
LEAKAGE
OUT1 Leakage Current
(Note 5) T
A
= 25
°
C
±
3
nA
T
MIN
to T
MAX
q
±
15
nA
Zero-Scale Error
T
A
= 25
°
C
±
0.2
LSB
T
MIN
to T
MAX
q
±
1
LSB
PSRR
Power Supply Rejection
V
DD
= 5V
±
10%
q
±
1
±
2
LSB/V
Reference Input
R
REF
V
REF
Input Resistance
(Note 6)
q
5
7
10
k
Ω
AC Performance
Output Current Settling Time
(Notes 7, 8)
1
µ
s
Mid-Scale Glitch Impulse
Using LT1122 Op Amp, C
FEEDBACK
= 33pF
1
nV-s
Digital-to-Analog Glitch Impulse
Full-Scale Transition, V
REF
= 0V,
2
nV-s
Using LT1122 Op Amp, C
FEEDBACK
= 33pF
Multiplying Feedthrough Error
V
REF
=
±
10V, 10kHz Sine Wave
1
mV
P-P
THD
Total Harmonic Distortion
(Note 9)
108
dB
Equivalent DAC Thermal Noise
(Note 10) f = 1kHz
11
nV/
√
Hz
Voltage Density
Analog Outputs (Note 4)
C
OUT
Output Capacitance (Note 4)
DAC Register Loaded to All 1s
C
OUT1
q
115
130
pF
DAC Register Loaded to All 0s
C
OUT1
q
70
80
pF
Digital Inputs
V
IH
Digital Input High Voltage
q
2.4
V
V
IL
Digital Input Low Voltage
q
0.8
V
I
IN
Digital Input Current
q
0.001
±
1
µ
A
C
IN
Digital Input Capacitance
(Note 4) V
IN
= 0V
q
8
pF
Digital Outputs: SRO (LTC1596/LTC1596-1)
V
OH
Digital Output High Voltage
I
OH
= 200
µ
A
q
4
V
V
OL
Digital Output Low Voltage
I
OL
= 1.6mA
q
0.4
V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Timing Characteristics (LTC1595)
t
DS
Serial Input to CLK Setup Time
q
30
5
ns
t
DH
Serial Input to CLK Hold Time
q
30
5
ns
DNL
Differential
T
A
= 25
°
C
±
0.2
±
1
±
1
±
2
LSB
Nonlinearity
T
MIN
to T
MAX
q
±
0.2
±
1
±
1
±
2
LSB
GE
Gain Error
(Note 3) T
A
= 25
°
C
2
±
16
±
16
±
32
LSB
T
MIN
to T
MAX
q
3
±
16
±
32
±
32
LSB
LTC1595C/96C/96-1C
LTC1595B/96B/96-1B
LTC1595A/96A/96-1A
V
DD
= 5V
±
10%, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
V
DD
= 5V
±
10%, V
REF
= 10V, V
OUT1
= GND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
4
LTC1595/LTC1596/LTC1596-1
ELECTRICAL CHARACTERISTICS
V
DD
= 5V
±
10%, V
REF
= 10V, V
OUT1
= V
OUT2
= AGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
The
q
denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
±
1LSB =
±
0.0015% of full scale =
±
15.3ppm of full scale.
Note 3: Using internal feedback resistor.
Note 4: Guaranteed by design, not subject to test.
Note 5: I
OUT1
with DAC register loaded with all 0s.
Note 6: Typical temperature coefficient is 100ppm/C.
Note 7: OUT1 load = 100
Ω
in parallel with 13pF.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
t
SRI
Serial Input Data Pulse Width
q
60
ns
t
CH
Clock Pulse Width High
q
60
ns
t
CL
Clock Pulse Width Low
q
60
ns
t
LD
Load Pulse Width
q
60
ns
t
ASB
LSB Clocked into Input Register
q
0
ns
to DAC Register Load Time
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Timing Characteristics (LTC1596/LTC1596-1)
t
DS1
Serial Input to Strobe Setup Time
STB1 Used as the Strobe
q
30
5
ns
t
DS2
STB2 Used as the Strobe
q
20
– 5
ns
t
DS3
STB3 Used as the Strobe
q
25
0
ns
t
DS4
STB4 Used as the Strobe
q
20
– 5
ns
t
DH1
Serial Input to Strobe Hold Time
STB1 Used as the Strobe
q
30
5
ns
t
DH2
STB2 Used as the Strobe
q
40
15
ns
t
DH3
STB3 Used as the Strobe
q
35
10
ns
t
DH4
STB4 Used as the Strobe
q
40
15
ns
t
SRI
Serial Input Data Pulse Width
q
60
ns
t
STB1
to
Strobe Pulse Width
(Note 11)
q
60
ns
t
STB4
t
STB1
to
Strobe Pulse Width
(Note 12)
q
60
ns
t
STB4
t
LD1,
t
LD2
LD Pulse Width
q
60
ns
t
ASB
LSB Strobed into Input Register
q
0
ns
to Load DAC Register Time
t
CLR
Clear Pulse Width
q
100
ns
t
PD1
STB1 to SRO Propagation Delay
C
L
= 50pF
q
30
150
ns
t
PD
STB2, STB3, STB4 to SRO
C
L
= 50pF
q
30
200
ns
Propagation Delay
Power Supply
V
DD
Supply Voltage
q
4.5
5
5.5
V
I
DD
Supply Current
Digital Inputs = 0V or V
DD
q
1.5
10
µ
A
Note 8: To 0.0015% for a full-scale change, measured from the falling
edge of LD1, LD2 or LD.
Note 9: V
REF
= 6V
RMS
at 1kHz. DAC register loaded with all 1s;
op amp = LT1007.
Note 10: Calculation from e
n
=
√
4kTRB where: k = Boltzmann constant
(J/
°
K); R = resistance (
Ω
); T = 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.
5
LTC1595/LTC1596/LTC1596-1
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
TIME (
µ
s)
0
1
2
3
4
OUTPUT VOLTAGE (mV)
0
1595/96 G01
–10
+10
1nV-s TYP
USING LT1122 OP AMP
C
FEEDBACK
= 33pF
V
REF
= 10V
LD FALLING EDGE
Mid-Scale Glitch Inpulse
DIGITAL INPUT CODE
0
–1.0
DIFFERENTIAL NONLINEARITY (LSB) –0.8
– 0.4
– 0.2
0
1.0
0.4
16384
32768
1595/96 G03
– 0.6
0.6
0.8
0.2
49152
65535
Integral Nonlinearity (INL)
Differential Nonlinearity (INL)
Differential Nonlinearity
vs Reference Voltage
Full-Scale Settling Waveform
DAC
OUTPUT
5V/DIV
GATED
SETTLING
WAVEFORM
500
µ
V/DIV
1
µ
s/DIV
1595/96 G04
REFERENCE VOLTAGE (V)
–10
DIFFERENTIAL NONLINEARITY (LSB)
0.5
6
1595/96 G06
0
– 6
– 2
0
10
1.0
2
– 8
– 4
8
4
Integral Nonlinearity
vs Reference Voltage
REFERENCE VOLTAGE (V)
–10
INTEGRAL NONLINEARITY (LSB)
0.5
6
1595/96 G05
0
– 6
– 2
0
10
1.0
2
– 8
– 4
8
4
Differential Nonlinearity
vs Supply Voltage
Multiplying Mode Frequency
Response vs Digital Code
FREQUENCY (Hz)
100
ATTENUATION (dB)
– 60
– 40
–20
0
1M
1595/96 G07
– 80
–100
–120
1k
10k
100k
10M
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
ALL
BITS OFF
ALL
BITS
ON
USING LT1122 OP AMP
C
FEEDBACK
= 33pF
Integral Nonlinearity
vs Supply Voltage
SUPPLY VOLTAGE (V)
2
0
INTEGRAL NONLINEARITY (LSB)
1
2
4
6
7
1595/96 G08
3
5
8
9
10
V
REF
= 10V
V
REF
= 2.5V
SUPPLY VOLTAGE (V)
2
0
DIFFERENTIAL NONLINEARITY (LSB)
0.5
1.0
4
6
7
1595/96 G09
3
5
8
9
10
USING LT1122 OP AMP
C
FEEDBACK
= 33pF
DIGITAL INPUT CODE
0
–1.0
INTEGRAL NONLINEARITY (LSB)
–0.6
– 0.8
–0.4
0.4
0.6
0.8
1.0
–0.2
0.2
0
16384
32768
1595/96 TA02
49152
65535