FEATURES
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LTC1591/LTC1597
14-Bit and 16-Bit Parallel
Low Glitch Multiplying DACs
with 4-Quadrant Resistors
DESCRIPTION
The LTC
®
1591/LTC1597 are pin compatible, parallel input
14-bit and 16-bit multiplying current output DACs that oper-
ate from a single 5V supply. INL and DNL are accurate to 1LSB
over the industrial temperature range in both 2- and 4-
quadrant multiplying modes. True 16-bit 4-quadrant multi-
plication is achieved with on-chip 4-quadrant multiplication
resistors.
These DACs include an internal deglitcher circuit that reduces
the glitch impulse to less than 2nV-s (typ). The asynchronous
CLR pin resets the LTC1591/LTC1597 to zero scale and
LTC1591-1/LTC1597-1 to midscale.
The LTC1591/LTC1597 are available in 28-pin SSOP and
PDIP packages and are specified over the industrial tempera-
ture range.
For serial interface 16-bit current output DACs refer to the
LTC1595/LTC1596 data sheet.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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True 16-Bit Performance Over Industrial
Temperature Range
DNL and INL: 1LSB Max
On-Chip 4-Quadrant Resistors Allow Precise 0V to
10V, 0V to – 10V or
±
10V Outputs
Pin Compatible 14- and 16-Bit Parts
Asynchronous Clear Pin
LTC1591/LTC1597: Reset to Zero Scale
LTC1591-1/LTC1597-1: Reset to Midscale
Glitch Impulse < 2nV-s
28-Lead SSOP Package
Low Power Consumption: 10µW Typ
Power-On Reset
APPLICATIONS
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Process Control and Industrial Automation
Direct Digital Waveform Generation
Software-Controlled Gain Adjustment
Automatic Test Equipment
TYPICAL APPLICATION
16-Bit, 4-Quadrant Multiplying DAC with a
Minimum of External Components
V
REF
5V
0.1µF
LTC1591/LTC1591-1 Integral Nonlinearity
1.0
0.8
INTEGRAL NONLINEARITY (LSB)
LT
®
1468
15pF
1
REF
23 4
V
CC
R
OFS
R
OFS
R
FB
V
OUT
=
–V
REF
TO V
REF
INTEGRAL NONLINEARITY (LSB)
5
R
FB
15pF
3
R1
R1
16
DATA
INPUTS
10 TO 21,
24 TO 27
2
R
COM
R2
LTC1597/LTC1597-1 Integral Nonlinearity
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
49152
32768
16384
DIGITAL INPUT CODE
65535
1591/97 TA03
LTC1597-1
16-BIT DAC
DGND
WR LD CLR
22
WR
LD
CLR
9
8
28
+
AGND
7
–
I
OUT1
6
LT1468
1591/97 TA01
U
U
U
V
REF
= 10V
V
OUT
=
±10V
BIPOLAR
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
12288
8192
4096
DIGITAL INPUT CODE
16383
1591/97 TA02
+
–
V
REF
= 10V
V
OUT
=
±10V
BIPOLAR
1
LTC1591/LTC1597
ABSOLUTE
MAXIMUM
RATINGS
(Note 1)
V
CC
to AGND ............................................... – 0.5V to 7V
V
CC
to DGND .............................................. – 0.5V to 7V
AGND to DGND ............................................. V
CC
+ 0.5V
DGND to AGND ............................................. V
CC
+ 0.5V
REF, R
OFS
, R
FB
, R1, R
COM
to AGND, DGND ..........
±25V
Digital Inputs to DGND ............... – 0.5V to (V
CC
+ 0.5V)
I
OUT1
to AGND ............................ – 0.5V to( V
CC
+ 0.5V)
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
LTC1591C/LTC1591-1C
LTC1597C/LTC1597-1C .......................... 0°C to 70°C
LTC1591I/LTC1591-1I
LTC1597I/LTC1597-1I ....................... – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER INFORMATION
ORDER PART
NUMBER
TOP VIEW
REF
R
COM
R1
R
OFS
R
FB
I
OUT1
AGND
LD
WR
1
2
3
4
5
6
7
8
9
28 CLR
27 NC
26 NC
25 D0
24 D1
23 V
CC
22 DGND
21 D2
20 D3
19 D4
18 D5
17 D6
16 D7
15 D8
N PACKAGE
28-LEAD NARROW PDIP
TOP VIEW
D13 10
D12 11
D11 12
D10 13
D9 14
G PACKAGE
28-LEAD PLASTIC SSOP
LTC1591CG
LTC1591CN
LTC1591IG
LTC1591IN
LTC1591-1CG
LTC1591-1CN
LTC1591-1IG
LTC1591-1IN
T
JMAX
= 125°C,
θ
JA
= 95°C/ W (G)
T
JMAX
= 125°C,
θ
JA
= 70°C/ W (N)
Consult factory for Military grade parts.
2
U
U
W
W W
U
W
ORDER PART
NUMBER
REF
R
COM
R1
R
OFS
R
FB
I
OUT1
AGND
LD
WR
1
2
3
4
5
6
7
8
9
28 CLR
27 D0
26 D1
25 D2
24 D3
23 V
CC
22 DGND
21 D4
20 D5
19 D6
18 D7
17 D8
16 D9
15 D10
N PACKAGE
28-LEAD NARROW PDIP
D15 10
D14 11
D13 12
D12 13
D11 14
G PACKAGE
28-LEAD PLASTIC SSOP
T
JMAX
= 125°C,
θ
JA
= 95°C/ W (G)
T
JMAX
= 125°C,
θ
JA
= 70°C/ W (N)
LTC1597ACG
LTC1597ACN
LTC1597BCG
LTC1597BCN
LTC1597-1ACG
LTC1597-1ACN
LTC1597-1BCG
LTC1597-1BCN
LTC1597AIG
LTC1597AIN
LTC1597BIG
LTC1597BIN
LTC1597-1AIG
LTC1597-1AIN
LTC1597-1BIG
LTC1597-1BIN
LTC1591/LTC1597
ELECTRICAL CHARACTERISTICS
V
CC
= 5V
±10%,
V
REF
= 10V, I
OUT1
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL PARAMETER
Accuracy
Resolution
Monotonicity
INL
DNL
GE
Integral Nonlinearity
Differential Nonlinearity
Gain Error
(Note 2) T
A
= 25°C
T
MIN
to T
MAX
T
A
= 25°C
T
MIN
to T
MAX
Unipolar Mode
(Note 3) T
A
= 25°C
T
MIN
to T
MAX
Bipolar Mode
(Note 3) T
A
= 25°C
T
MIN
to T
MAX
Gain Temperature Coefficient
Bipolar Zero-Scale Error
I
LKG
PSRR
OUT1 Leakage Current
Power Supply Rejection Ratio
(Note 4)
∆Gain/∆Temperature
T
A
= 25°C
T
MIN
to T
MAX
(Note 5) T
A
= 25°C
T
MIN
to T
MAX
V
CC
= 5V
±10
q
q
q
q
CONDITIONS
LTC1591/-1
LTC1597B/-1B
MIN TYP MAX MIN TYP MAX
14
14
±1
±1
±
1
±1
±4
±6
±4
±6
1
2
±
3
±
5
±5
±15
±0.1
±1
±0.4
1
16
16
±
2
±2
±1
±1
±16
±24
±
16
±
24
2
±
10
±
16
±5
±15
±2
LTC1597A/-1A
MIN TYP MAX
16
16
±0.25
±0.35
±0.2
±0.2
2
3
2
3
1
±1
±1
±1
±1
±16
±16
±16
±
16
2
±
5
±
8
±5
±15
±0.4
±2
UNITS
Bits
Bits
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
ppm/°C
LSB
LSB
nA
nA
LSB/V
q
q
q
q
q
q
V
CC
= 5V
±10%,
V
REF
= 10V, I
OUT1
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
R
REF
R1/R2
R
OFS
, R
FB
PARAMETER
DAC Input Resistance (Unipolar)
R1/R2 Resistance (Bipolar)
Feedback and Offset Resistances
Output Current Settling Time
Midscale Glitch Impulse
Digital-to-Analog Glitch Impulse
Multiplying Feedthrough Error
THD
Total Harmonic Distortion
Output Noise Voltage Density
Harmonic Distortion
(Digital Waveform Generation)
CONDITIONS
(Note 6)
(Notes 6, 13)
(Note 6)
(Notes 7, 8)
(Note 12)
(Note 9)
V
REF
=
±10V,
10kHz Sine Wave
(Note 10)
(Note 11)
Unipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
Bipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
q
q
q
MIN
4.5
9
9
TYP
6
12
12
1
2
1
1
108
10
94
101
94
94
101
94
MAX
10
20
20
UNITS
kΩ
kΩ
kΩ
µs
nV-s
nV-s
mV
P-P
dB
nV/√Hz
dB
dB
dB
dB
dB
dB
Reference Input
AC Performance (Note 4)
3
LTC1591/LTC1597
ELECTRICAL CHARACTERISTICS
V
CC
= 5V
±10%,
V
REF
= 10V, I
OUT1
= AGND = DGND = 0V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.
SYMBOL
C
OUT
PARAMETER
Output Capacitance (Note 4)
CONDITIONS
DAC Register Loaded to All 1s: C
OUT1
DAC Register Loaded to All 0s: C
OUT1
q
q
MIN
TYP
115
70
MAX
130
80
UNITS
pF
pF
V
Analog Outputs (Note 4)
Digital Inputs
V
IH
V
IL
I
IN
C
IN
t
DS
t
DH
t
WR
t
LD
t
CLR
t
LWD
V
DD
I
DD
Digital Input High Voltage
Digital Input Low Voltage
Digital Input Current
Digital Input Capacitance
Data to WR Setup Time
Data to WR Hold Time
WR Pulse Width
LD Pulse Width
Clear Pulse Width
WR to LD Delay Time
Supply Voltage
Supply Current
Digital Inputs = 0V or V
CC
(Note 4) V
IN
= 0V
q
q
q
q
2.4
0.8
0.001
±1
8
60
0
60
110
60
0
4.5
5
5.5
10
20
–12
25
55
40
V
µA
pF
ns
ns
ns
ns
ns
ns
V
µA
Timing Characteristics
q
q
q
q
q
q
Power Supply
q
q
The
q
denotes specifications that apply over the full operating temperature
range.
Note 1:
Absolute Maximum Values are those beyond which the life of a
device may be impaired.
Note 2:
±1LSB
=
±0.006%
of full scale =
±61ppm
of full scale for the
LTC1591/LTC1591-1.
±1LSB
=
±0.0015%
of full scale =
±15.3ppm
of full
scale for the LTC1597/LTC1597-1.
Note 3:
Using internal feedback resistor.
Note 4:
Guaranteed by design, not subject to test.
Note 5:
I
(OUT1)
with DAC register loaded to all 0s.
Note 6:
Typical temperature coefficient is 100ppm/°C.
Note 7:
I
OUT1
load = 100Ω in parallel with 13pF.
Note 8:
To 0.006% for a full-scale change, measured from the rising edge
of LD for the LTC1591/LTC1591-1. To 0.0015% for a full-scale change,
measured from the rising edge of LD for the LTC1597/LTC1597-1.
Note 9:
V
REF
= 0V. DAC register contents changed from all 0s to all 1s or
all 1s to all 0s.
Note 10:
V
REF
= 6V
RMS
at 1kHz. DAC register loaded with all 1s.
Note 11:
Calculation from e
n
=
√4kTRB
where: k = Boltzmann constant
(J/°K), R = resistance (Ω), T = temperature (°K), B = bandwidth (Hz).
Note 12:
Midscale transition code: 01 1111 1111 1111 to 10 0000 0000
0000 for the LTC1591/LTC1591-1 and 0111 1111 1111 1111 to 1000
0000 0000 0000 for the LTC1597/LTC1597-1.
Note 13:
R1 and R2 are measured between R1 and R
COM
, REF and R
COM
.
Note 14:
Measured using the LT1468 op amp in unipolar mode for I/V
converter and LT1468 I/V and LT1001 reference inverter in bipolar mode.
Sample Rate = 50kHz, Signal Frequency = 1kHz, V
REF
= 5V, T
A
= 25°C.
4
LTC1591/LTC1597
TYPICAL PERFOR A CE CHARACTERISTICS
Midscale Glitch Impulse
40
30
OUTPUT VOLTAGE (mV)
SIGNAL/(NOISE + DISTORTION) (dB)
USING AN LT1468
C
FEEDBACK
= 30pF
V
REF
= 10V
LD PULSE
5V/DIV
20
10
0
–10
–20
– 30
– 40
0
0.2
0.4
0.6
TIME (µs)
0.8
1.0
1591/97 G01
1nV-s TYPICAL
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Zeros
– 40
SIGNAL/(NOISE + DISTORTION) (dB)
SIGNAL/(NOISE + DISTORTION) (dB)
– 50
– 60
– 70
– 80
V
CC
= 5V USING TWO LT1468s
C
FEEDBACK
= 15pF
REFERENCE = 6V
RMS
– 90
80kHz FILTER
30kHz
FILTER
10
100
1k
10k
FREQUENCY (Hz)
100k
1591/97 G04
–100
–110
Supply Current vs Input Voltage
5
V
CC
= 5V
ALL DIGITAL INPUTS
TIED TOGETHER
LOGIC THRESHOLD (V)
4
SUPPLY CURRENT (mA)
3
2
1
0
0
1
U W
(LTC1591/LTC1597)
Unipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency
– 40
– 50
– 60
– 70
– 80
500kHz FILTER
– 90
80kHz FILTER
30kHz FILTER
10
100
1k
10k
FREQUENCY (Hz)
100k
1591/97 G03
Full-Scale Settling Waveform
V
CC
= 5V USING AN LT1468
C
FEEDBACK
= 30pF
REFERENCE = 6V
RMS
GATED
SETTLING
WAVEFORM
500µV/DIV
500ns/DIV
USING LT1468 OP AMP
C
FEEDBACK
= 20pF
0V to 10V STEP
1591/97 G02
–100
–110
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Ones
– 40
– 50
– 60
– 70
– 80
500kHz FILTER
– 90
80kHz FILTER
30kHz FILTER
–110
10
100
1k
10k
FREQUENCY (Hz)
100k
1591/97 G05
V
CC
= 5V USING TWO LT1468s
C
FEEDBACK
= 15pF
REFERENCE = 6V
RMS
500kHz FILTER
–100
Logic Threshold vs Supply Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0
3
2
INTPUT VOLTAGE (V)
4
5
1591/97 G06
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
6
7
1591/97 G07
5
FPGA/CPLD
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