LTC1591/LTC1597
14-Bit and 16-Bit Parallel
Low Glitch Multiplying DACs
with 4-Quadrant Resistors
Description
Features
True 16-Bit Performance Over Industrial
Temperature Range
nn DNL and INL: 1LSB Max
nn On-Chip 4-Quadrant Resistors Allow Precise 0V to
10V, 0V to –10V or ±10V Outputs
nn Pin Compatible 14- and 16-Bit Parts
nn Asynchronous Clear Pin
nn LTC1591/LTC1597: Reset to Zero Scale
nn LTC1591-1/LTC1597-1: Reset to Mid-Scale
nn Glitch Impulse < 2nV-s
nn Low Power Consumption: 10µW Typ
nn Power-On Reset
nn 28-Lead SSOP Package
nn
Applications
Process Control and Industrial Automation
Direct Digital Waveform Generation
nn Software-Controlled Gain Adjustment
nn Automatic Test Equipment
nn
nn
The LTC®1591/LTC1597 are pin compatible, parallel
input 14-bit and 16-bit multiplying current output DACs
that operate 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 16bit 4-quadrant multiplication 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 mid-scale.
The LTC1591/LTC1597 are available in the 28-pin SSOP
package and are specified over the industrial temperature
range.
For serial interface 16-bit current output DACs refer to the
LTC1595/LTC1596 data sheet.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
LTC1591/LTC1591-1 Integral Nonlinearity
1.0
VREF = 10V
VOUT = ±10V BIPOLAR
INTEGRAL NONLINEARITY (LSB)
0.8
16-Bit, 4-Quadrant Multiplying DAC with a
Minimum of External Components
VREF
+
5V
0.1µF
®
LT 1468
–
R2
16
DATA
INPUTS
LTC1597-1
10 TO 21,
24 TO 27
WR
LD
CLR
9
8
28
0
–0.2
–0.4
–0.6
–1.0
1
REF
23 4
VCC ROFS
ROFS
0
RFB
RFB
16-BIT DAC
12288
8192
4096
DIGITAL INPUT CODE
16383
1591/97 TA02
LTC1597/LTC1597-1 Integral Nonlinearity
15pF
1.0
IOUT1
–
6
AGND
DGND
WR LD CLR
0.2
5
7
+
VREF = 10V
VOUT = ±10V BIPOLAR
0.8
LT1468
VOUT =
–VREF
TO VREF
22
1591/97 TA01
INTEGRAL NONLINEARITY (LSB)
2
RCOM
R1
0.4
–0.8
15pF
3
R1
0.6
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
For more information www.linear.com/LTC1591
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1
LTC1591/LTC1597
Absolute Maximum Ratings
(Note 1)
VCC to AGND.................................................– 0.5V to 7V
VCC to DGND ............................................... – 0.5V to 7V
AGND to DGND ............................................. VCC + 0.5V
DGND to AGND ............................................. VCC + 0.5V
REF, ROFS, RFB, R1, RCOM to AGND, DGND ............ ±25V
Digital Inputs to DGND ................. –0.5V to (VCC + 0.5V)
IOUT1 to AGND .............................. –0.5V to( VCC + 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
Pin Configuration
LTC1591
LTC1591
TOP VIEW
REF
1
28 CLR
RCOM
2
R1
TOP VIEW
REF
1
28 CLR
27 NC
RCOM
2
27 NC
3
26 NC
R1
3
26 NC
ROFS
4
25 D0
ROFS
4
25 D0
RFB
5
24 D1
RFB
5
24 D1
IOUT1
6
23 VCC
IOUT1
6
23 VCC
AGND
7
22 DGND
AGND
7
22 DGND
LD
8
21 D2
LD
8
21 D2
WR
9
20 D3
WR
9
20 D3
D13 10
19 D4
D13 10
19 D4
D12 11
18 D5
D12 11
18 D5
D11 12
17 D6
D11 12
17 D6
D10 13
16 D7
D10 13
16 D7
D9 14
15 D8
D9 14
15 D8
G PACKAGE
28-LEAD PLASTIC SSOP
N PACKAGE
28-LEAD NARROW PDIP
TJMAX = 125°C, θJA = 95°C/ W
TJMAX = 125°C, θJA = 70°C/W
OBSOLETE PACKAGE
LTC1597
LTC1597
TOP VIEW
TOP VIEW
REF
1
28 CLR
REF
1
RCOM
2
28 CLR
27 D0
RCOM
2
R1
27 D0
3
26 D1
R1
3
26 D1
ROFS
4
25 D2
ROFS
4
25 D2
RFB
5
24 D3
RFB
5
24 D3
IOUT1
6
IOUT1
6
AGND
7
23 VCC
22 DGND
AGND
7
23 VCC
22 DGND
LD
8
21 D4
LD
8
21 D4
WR
9
20 D5
WR
9
20 D5
D15 10
19 D6
D15 10
19 D6
D14 11
18 D7
D14 11
18 D7
D13 12
17 D8
D13 12
17 D8
D12 13
16 D9
D12 13
16 D9
D11 14
15 D10
D11 14
15 D10
G PACKAGE
28-LEAD PLASTIC SSOP
N PACKAGE
28-LEAD NARROW PDIP
TJMAX = 125°C, θJA = 95°C/ W
TJMAX = 125°C, θJA = 70°C/W
OBSOLETE PACKAGE
2
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC1591CG#PBF
LTC1591CG#TRPBF
LTC1591CG
28-Lead Plastic SSOP
0°C to 70°C
LTC1591-1CG#PBF
LTC1591-1CG#TRPBF
LTC1591-1CG
28-Lead Plastic SSOP
0°C to 70°C
LTC1591IG#PBF
LTC1591IG#TRPBF
LTC1591IG
28-Lead Plastic SSOP
–40°C to 85°C
LTC1591-1IG#PBF
LTC1591-1IG#TRPBF
LTC1591-1IG
28-Lead Plastic SSOP
–40°C to 85°C
LTC1597ACG#PBF
LTC1597ACG#TRPBF
LTC1597ACG
28-Lead Plastic SSOP
0°C to 70°C
LTC1597-1ACG#PBF
LTC1597-1ACG#TRPBF
LTC1597-1ACG
28-Lead Plastic SSOP
0°C to 70°C
LTC1597BCG#PBF
LTC1597BCG#TRPBF
LTC1597BCG
28-Lead Plastic SSOP
0°C to 70°C
LTC1597-1BCG#PBF
LTC1597-1BCG#TRPBF
LTC1597-1BCG
28-Lead Plastic SSOP
0°C to 70°C
LTC1597AIG#PBF
LTC1597AIG#TRPBF
LTC1597AIG
28-Lead Plastic SSOP
–40°C to 85°C
LTC1597-1AIG#PBF
LTC1597-1AIG#TRPBF
LTC1597-1AIG
28-Lead Plastic SSOP
–40°C to 85°C
LTC1597BIG#PBF
LTC1597BIG#TRPBF
LTC1597BIG
28-Lead Plastic SSOP
–40°C to 85°C
LTC1597-1BIG#PBF
LTC1597-1BIG#TRPBF
LTC1597-1BIG
28-Lead Plastic SSOP
–40°C to 85°C
OBSOLETE PACKAGE
LTC1591CN#PBF
LTC1591CN#TRPBF
LTC1591CN
28-Lead Narrow PDIP
0°C to 70°C
LTC1591-1CN#PBF
LTC1591-1CN#TRPBF
LTC1591-1CN
28-Lead Narrow PDIP
0°C to 70°C
LTC1591IN#PBF
LTC1591IN#TRPBF
LTC1591IN
28-Lead Narrow PDIP
–40°C to 85°C
LTC1591-1IN#PBF
LTC1591-1IN#TRPBF
LTC1591-1IN
28-Lead Narrow PDIP
–40°C to 85°C
LTC1597ACN#PBF
LTC1597ACN#TRPBF
LTC1597ACN
28-Lead Narrow PDIP
0°C to 70°C
LTC1597-1ACN#PBF
LTC1597-1ACN#TRPBF
LTC1597-1ACN
28-Lead Narrow PDIP
0°C to 70°C
LTC1597BCN#PBF
LTC1597BCN#TRPBF
LTC1597BCN
28-Lead Narrow PDIP
0°C to 70°C
LTC1597-1BCN#PBF
LTC1597-1BCN#TRPBF
LTC1597-1BCN
28-Lead Narrow PDIP
0°C to 70°C
LTC1597AIN#PBF
LTC1597AIN#TRPBF
LTC1597AIN
28-Lead Narrow PDIP
–40°C to 85°C
LTC1597-1AIN#PBF
LTC1597-1AIN#TRPBF
LTC1597-1AIN
28-Lead Narrow PDIP
–40°C to 85°C
LTC1597BIN#PBF
LTC1597BIN#TRPBF
LTC1597BIN
28-Lead Narrow PDIP
–40°C to 85°C
LTC1597-1BIN#PBF
LTC1597-1BIN#TRPBF
LTC1597-1BIN
28-Lead Narrow PDIP
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part markings, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
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For more information www.linear.com/LTC1591
3
LTC1591/LTC1597
Electrical Characteristics
VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
LTC1591/-1
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
LTC1597B/-1B
MAX MIN
TYP
MAX
LTC1597A/-1A
MIN
TYP
MAX
UNITS
Accuracy
INL
DNL
GE
Resolution
l
14
16
16
Bits
Monotonicity
l
14
16
16
Bits
Integral Nonlinearity
Differential Nonlinearity
Gain Error
(Note 2) TA = 25°C
TMIN to TMAX
l
±1
±1
±2
±2
± 0.25
± 0.35
±1
±1
LSB
LSB
TA = 25°C
TMIN to TMAX
l
±1
±1
±1
±1
± 0.2
± 0.2
±1
±1
LSB
LSB
l
±4
±6
± 16
± 24
2
3
± 16
± 16
LSB
LSB
l
±4
±6
± 16
± 24
2
3
± 16
± 16
LSB
LSB
2
1
Unipolar Mode
(Note 3) TA = 25°C
TMIN to TMAX
Bipolar Mode
(Note 3) TA = 25°C
TMIN to TMAX
ILKG
PSRR
Gain Temperature Coefficient
(Note 4) ∆Gain/∆Temperature
Bipolar Zero-Scale Error
OUT1 Leakage Current
Power Supply Rejection Ratio
2
ppm/°C
l
±3
±5
± 10
± 16
±5
±8
LSB
LSB
(Note 5) TA = 25°C
TMIN to TMAX
l
±5
± 15
±5
± 15
±5
± 15
nA
nA
VCC = 5V ±10
l
±2
LSB/V
TA = 25°C
TMIN to TMAX
l
1
±0.1
2
1
±1
± 0.4
±2
± 0.4
VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Reference Input
RREF
DAC Input Resistance (Unipolar)
(Note 6)
l
4.5
6
10
kΩ
R1/R2
R1/R2 Resistance (Bipolar)
(Notes 6, 13)
l
9
12
20
kΩ
ROFS, RFB
Feedback and Offset Resistances
(Note 6)
l
9
12
20
kΩ
AC Performance (Note 4)
THD
4
Output Current Settling Time
(Notes 7, 8)
1
µs
Mid-Scale Glitch Impulse
(Note 12)
2
nV-s
Digital-to-Analog Glitch Impulse
(Note 9)
1
nV-s
Multiplying Feedthrough Error
VREF = ±10V, 10kHz Sine Wave
1
mVP-P
Total Harmonic Distortion
(Note 10)
108
dB
Output Noise Voltage Density
(Note 11)
10
nV/√Hz
Harmonic Distortion
(Digital Waveform Generation)
Unipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
94
101
94
dB
dB
dB
Bipolar Mode (Note 14)
2nd Harmonic
3rd Harmonic
SFDR
94
101
94
dB
dB
dB
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Electrical
Characteristics
The ● denotes specifications that apply over the full operating temperature
range. VCC = 5V ±10%, VREF = 10V, IOUT1 = AGND = DGND = 0V, TA = TMIN to TMAX, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
115
70
130
80
pF
pF
Analog Outputs (Note 4)
COUT
Output Capacitance (Note 4)
DAC Register Loaded to All 1s: COUT1
DAC Register Loaded to All 0s: COUT1
l
l
Digital Inputs
VIH
Digital Input High Voltage
l
VIL
Digital Input low Voltage
l
IIN
Digital Input Current
l
CIN
Digital Input Capacitance
(Note 4) VIN = 0V
2.4
V
0.001
l
0.8
V
±1
µA
8
pF
Timing Characteristics
tDS
Data to WR Setup Time
l
tDH
Data to WR Hold Time
tWR
60
ns
l
0
ns
WR Pulse Width
l
60
ns
tLD
LD Pulse Width
l
110
ns
tCLR
Clear Pulse Width
l
60
ns
tLWD
WR to LD Delay Time
l
0
ns
l
4.5
Power Supply
VDD
Supply Voltage
IDD
Supply Current
Digital Inputs = 0V or VCC
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
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: IOUT1 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.
l
5
5.5
V
10
µA
Note 9: VREF = 0V. DAC register contents changed from all 0s to all 1s or
all 1s to all 0s.
Note 10: VREF = 6VRMS at 1kHz. DAC register loaded with all 1s.
Note 11: Calculation from en = √4kTRB where: k = Boltzmann constant
(J/°K), R = resistance (Ω), T = temperature (°K), B = bandwidth (Hz).
Note 12: Mid-scale 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 RCOM, REF and RCOM.
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, VREF = 5V, TA = 25°C.
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For more information www.linear.com/LTC1591
5
LTC1591/LTC1597
Typical Performance Characteristics
Mid-Scale Glitch Impulse
40
Full-Scale Settling Waveform
–40
SIGNAL/(NOISE + DISTORTION) (dB)
OUTPUT VOLTAGE (mV)
Unipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency
USING AN LT1468
CFEEDBACK = 30pF
VREF = 10V
30
LD PULSE
5V/DIV
20
10
0
GATED
SETTLING
WAVEFORM
500µV/DIV
1nV-s TYPICAL
–10
–20
1591/97 G02
500ns/DIV
–30
–40
(LTC1591/LTC1597)
0
0.2
0.4
0.8
0.6
TIME (µs)
VCC = 5V USING AN LT1468
CFEEDBACK = 30pF
REFERENCE = 6VRMS
–60
–70
–80
500kHz FILTER
–90
80kHz FILTER
–100
USING LT1468 OP AMP
CFEEDBACK = 20PF
0V TO 10V STEP
1.0
–50
–110
30kHz FILTER
100
10
1k
10k
FREQUENCY (Hz)
1591/97 G03
1591/97 G01
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Zeros
Bipolar Multiplying Mode
Signal-to-(Noise + Distortion)
vs Frequency, Code = All Ones
–40
VCC = 5V USING TWO LT1468s
CFEEDBACK = 15pF
REFERENCE = 6VRMS
–50
SIGNAL/(NOISE + DISTORTION) (dB)
SIGNAL/(NOISE + DISTORTION) (dB)
–40
–60
–70
–80
500kHz FILTER
–90
–100
–110
80kHz FILTER
100
10
–60
–70
–80
500kHz FILTER
–90
80kHz FILTER
–100
30kHz
FILTER
1k
10k
FREQUENCY (Hz)
VCC = 5V USING TWO LT1468s
CFEEDBACK = 15pF
REFERENCE = 6VRMS
–50
100k
–110
30kHz FILTER
100
10
1k
10k
FREQUENCY (Hz)
1591/97 G04
2.5
LOGIC THRESHOLD (V)
SUPPLY CURRENT (mA)
Logic Threshold vs Supply Voltage
3.0
VCC = 5V
ALL DIGITAL INPUTS
TIED TOGETHER
4
3
2
1
0
2.0
1.5
1.0
0.5
0
1
3
2
INTPUT VOLTAGE (V)
4
5
0
0
1
1591/97 G06
6
100k
1591/97 G05
Supply Current vs Input Voltage
5
100k
2
3
4
5
SUPPLY VOLTAGE (V)
6
7
1591/97 G07
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Typical Performance Characteristics
Differential Nonlinearity (DNL)
1.0
0.8
0.8
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
0
12280
8192
4096
DIGITAL INPUT CODE
INTEGRAL NONLINEARITY (LSB)
1.0
–1.0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
16383
0.4
0.2
0
–0.2
–0.4
–0.6
0
12280
8192
4096
DIGITAL INPUT CODE
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
16383
1591 G03
1.0
0.8
0.8
0.8
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
8
DIFFERENTIAL NONLINEARITY (LSB)
1.0
0.4
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
10
8
1591 G04
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
10
Differential Nonlinearity vs
Supply Voltage in Unipolar Mode
1.0
0.8
0.8
0.8
0.2
VREF = 2.5V
0
VREF = 10V
VREF = 10V
VREF = 2.5V
–0.2
–0.4
–0.6
–0.8
–1.0
DIFFERENTIAL NONLINEARITY (LSB)
1.0
INTEGRAL NONLINEARITY (LSB)
1.0
0.4
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
VREF = 2.5V
–0.2
VREF = 10V
–0.4
–0.6
–0.8
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
6
7
1591 G07
–1.0
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
7
6
10
1591 G06
Integral Nonlinearity vs
Supply Voltage in Bipolar Mode
0.6
8
1591 G05
Integral Nonlinearity vs
Supply Voltage in Unipolar Mode
10
Differential Nonlinearity
vs Reference Voltage
in Bipolar Mode
1.0
0.6
8
1591 G02
Differential Nonlinearity
vs Reference Voltage
in Unipolar Mode
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
0.6
–0.8
1591 G01
Integral Nonlinearity
vs Reference Voltage
in Bipolar Mode
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode
1.0
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity (INL)
(LTC1591)
1591 G08
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
VREF = 10V
VREF = 2.5V
–0.2
–0.4
–0.6
–0.8
–1.0
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
6
7
1591 G09
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For more information www.linear.com/LTC1591
7
LTC1591/LTC1597
Typical Performance Characteristics
(LTC1591)
Differential Nonlinearity vs
Supply Voltage in Bipolar Mode
Unipolar Multiplying Mode Frequency
Response vs Digital Code
0
ALL BITS ON
D13 ON
D12 ON
D11 ON
D10 ON
D9 ON
D8 ON
D7 ON
D6 ON
D5 ON
D4 ON
D3 ON
D2 ON
D1 ON
D0 ON
0.8
–20
0.6
0.4
0.2
ATTENUATION (dB)
DIFFERENTIAL NONLINEARITY (LSB)
1.0
VREF = 10V
VREF = 2.5V
0
VREF = 10V
VREF = 2.5V
–0.2
–0.4
–0.6
–40
–60
–80
–100
–0.8
–1.0
ALL BITS OFF
0
1
4
3
2
5
SUPPLY VOLTAGE (V)
7
6
–120
100
1k
10k
100k
FREQUENCY (Hz)
1591G11
1591 G10
VREF
30pF
3 2 1 4 5
LTC1591
Bipolar Multiplying Mode Frequency
Response vs Digital Code
0
ALL BITS ON
D13 AND D12 ON
D13 AND D11 ON
D13 AND D10 ON
D13 AND D9 ON
D13 AND D8 ON
D13 AND D7 ON
D13 AND D6 ON
D13 AND D5 ON
D13 AND D4 ON
D13 AND D3 ON
D13 AND D2 ON
D13 AND D1 ON
D13 AND D0 ON
D13 ON*
–40
–60
–80
–100
10
100
–40
–60
–80
1k
10k
100k
FREQUENCY (Hz)
1M
10M
–100
–
LT1468
+
7
22
VOUT
ALL BITS OFF
D12 ON
D12 AND D11 ON
D12 TO D10 ON
D12 TO D9 ON
D12 TO D8 ON
D12 TO D7 ON
D12 TO D6 ON
D12 TO D5 ON
D12 TO D4 ON
D12 TO D3 ON
D12 TO D2 ON
D12 TO D1 ON
D12 TO D0 ON
D13 ON*
–20
CODES FROM MIDSCALE TO FULL SCALE
6
Bipolar Multiplying Mode Frequency
Response vs Digital Code
0
ATTENUATION (dB)
ATTENUATION (dB)
–20
CODES FROM MIDSCALE TO ZERO SCALE
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –84dB TYPICAL (–70dB MAX)
VREF
VREF
+
+
LT1468
–
15pF
2
1 4 5
LTC1591
8
LT1468
–
VOUT
12pF
12pF
3
10M
1591G13
1591 G12
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –84dB TYPICAL (–70dB MAX)
10M
1M
6
7
22
–
LT1468
+
VOUT
12pF
12pF
15pF
3
2
1 4 5
LTC1591
6
7
22
–
LT1468
+
15917fb
For more information www.linear.com/LTC1591
LTC1591/LTC1597
Typical Performance Characteristics
Differential Nonlinearity (DNL)
1.0
0.8
0.8
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
0
49152
32768
16384
DIGITAL INPUT CODE
INTEGRAL NONLINEARITY (LSB)
1.0
–1.0
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
65535
0.4
0.2
0
–0.2
–0.4
–0.6
0
49152
32768
16384
DIGITAL INPUT CODE
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
65535
1.0
0.8
0.8
0.8
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
8
DIFFERENTIAL NONLINEARITY (LSB)
1.0
0.4
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
10
Integral Nonlinearity vs
Supply Voltage in Unipolar Mode
0.6
VREF = 10V
VREF = 2.5V
0
VREF = 10V
–0.2
VREF = 2.5V
–0.4
–0.6
–0.8
2
3
4
5
6
SUPPLY VOLTAGE (V)
0
–0.2
–0.4
–0.6
–0.8
7
1597 G07
10
Differential Nonlinearity vs
Supply Voltage in Unipolar Mode
1.0
1.5
1.0
0.5
VREF = 10V
0
VREF = 2.5V
VREF = 10V
–0.5
VREF = 2.5V
–1.0
–1.5
–2.0
8
1597 G06
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
0.8
0.2
0.2
–1.0
–10 –8 –6 –4 –2 0 2 4 6
REFERENCE VOLTAGE (V)
10
2.0
0.4
0.4
Integral Nonlinearity vs
Supply Voltage in Bipolar Mode
1.0
–1.0
8
0.6
1597 G05
1597 G04
10
Differential Nonlinearity
vs Reference Voltage
in Bipolar Mode
1.0
0.6
8
1597 G03
1597 G02
Differential Nonlinearity
vs Reference Voltage
in Unipolar Mode
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
0.6
–0.8
1597 G01
Integral Nonlinearity
vs Reference Voltage
in Bipolar Mode
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity
vs Reference Voltage
in Unipolar Mode
1.0
DIFFERENTIAL NONLINEARITY (LSB)
INTEGRAL NONLINEARITY (LSB)
Integral Nonlinearity (INL)
(LTC1597)
2
3
7
4
5
6
SUPPLY VOLTAGE (V)
1597 G08
0.8
0.6
0.4
VREF = 10V
VREF = 2.5V
0.2
0
–0.2
VREF = 10V
VREF = 2.5V
–0.4
–0.6
–0.8
–1.0
2
3
4
5
6
SUPPLY VOLTAGE (V)
7
1597 G09
15917fb
For more information www.linear.com/LTC1591
9
LTC1591/LTC1597
Typical Performance Characteristics
(LTC1597)
Differential Nonlinearity vs
Supply Voltage in Bipolar Mode
Unipolar Multiplying Mode Frequency
Response vs Digital Code
0
ALL BITS ON
D13 ON
D12 ON
D11 ON
D10 ON
D9 ON
D8 ON
D7 ON
D6 ON
D5 ON
D4 ON
D3 ON
D2 ON
D1 ON
D0 ON
0.8
–20
0.6
0.4
0.2
ATTENUATION (dB)
DIFFERENTIAL NONLINEARITY (LSB)
1.0
VREF = 10V
0
VREF = 2.5V
–0.2
VREF = 10V
VREF = 2.5V
–0.4
–0.6
–60
–80
–100
–0.8
–1.0
–40
ALL BITS OFF
3
2
7
4
5
6
SUPPLY VOLTAGE (V)
–120
100
10k
100k
FREQUENCY (Hz)
1k
10M
1M
1591G11
1597 G10
VREF
30pF
3 2 1 4 5
LTC1591
Bipolar Multiplying Mode Frequency
Response vs Digital Code
ALL BITS ON
D15 AND D14 ON
D15 AND D13 ON
D15 AND D12 ON
D15 AND D11 ON
D15 AND D10 ON
D15 AND D9 ON
D15 AND D8 ON
D15 AND D7 ON
D15 AND D6 ON
D15 AND D5 ON
D15 AND D4 ON
D15 AND D3 ON
D15 AND D2 ON
ATTENUATION (dB)
–20
–40
–60
–80
–100
CODES FROM
MIDSCALE
TO FULL SCALE
100
1k
10k
100k
FREQUENCY (Hz)
1M
–60
D14 TO D5 ON
D14 TO D4 ON
D14 TO D3 ON
D14 TO D2 ON
D14 TO D1 ON
–80
10M
7
22
VOUT
ALL BITS OFF
D14 ON
D14 AND D13 ON
D14 TO D12 ON
D14 TO D11 ON
D14 TO D10 ON
D14 TO D9 ON
D14 TO D8 ON
D14 TO D7 ON
D14 TO D6 ON
–40
–100
–
LT1468
+
Bipolar Multiplying Mode Frequency
Response vs Digital Code
–20
D15 AND D1 ON
D15 AND D0 ON
D15 ON*
10
0
ATTENUATION (dB)
0
6
CODES FROM
MIDSCALE
TO ZERO SCALE
D14 TO D0 ON
D15 ON*
10
100
1k
10k
100k
FREQUENCY (Hz)
1M
1597 G12
1597 G13
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)
*DAC ZERO VOLTAGE OUTPUT LIMITED BY BIPOLAR
ZERO ERROR TO –96dB TYPICAL (–78dB MAX, A GRADE)
VREF
VREF
+
+
LT1468
–
LT1468
–
VOUT
12pF
12pF
VOUT
12pF
12pF
15pF
3
2
1 4 5
LTC1597
10
10M
6
7
22
–
LT1468
+
15pF
3
2
1 4 5
LTC1597
6
7
22
–
LT1468
+
15917fb
For more information www.linear.com/LTC1591
LTC1591/LTC1597
Pin Functions
LTC1591
REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.
Typically ±10V, accepts up to ± 25V. In 2-Quadrant mode
this is the reference input. In 4-quadrant mode, this pin is
driven by external inverting reference amplifier.
RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant
Resistors R1 and R2. Normally tied to the inverting input
of an external amplifier in 4-quadrant operation, otherwise
shorted to the REF pin. See Figures 1a and 2a.
R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant operation short to the REF pin. In 4-quadrant mode tie to ROFS
(Pin 4).
ROFS (Pin 4): Bipolar Offset Resistor. Typically swings
±10V, accepts up to ±25V. In 2-quadrant operation tie to
RFB. In 4-quadrant operation tie to R1.
RFB (Pin 5): Feedback Resistor. Normally tied to the output
of the current to voltage converter op amp. Swings to
±VREF. VREF is typically ±10V.
IOUT1 (Pin 6): DAC Current Output. Tie to the inverting
input of the current to voltage converter op amp.
AGND (Pin 7): Analog Ground. Tie to ground.
LD (Pin 8): DAC Digital Input Load Control Input. When
LD is taken to a logic high, data is loaded from the input
register into the DAC register, updating the DAC output.
WR (Pin 9): DAC Digital Write Control Input. When WR is
taken to a logic low, data is loaded from the digital input
pins into the 14-bit wide input register.
DB13 to D2 (Pins 10 to 21): Digital Input Data Bits.
DGND (Pin 22): Digital Ground. Tie to ground.
VCC (Pin 23): The Positive Supply Input. 4.5V≤VCC ≥5.5V.
Requires a bypass capacitor to ground.
DB1, DB0 (Pins 24, 25): Digital Input Data Bits.
NC (Pins 26, 27): No Connect.
CLR (Pin 28): Digital Clear Control Function for the DAC.
When CLR is taken to a logic low, it sets the DAC output
and all internal registers to zero code for the LTC1591 and
mid-scale code for the LTC1591-1.
15917fb
For more information www.linear.com/LTC1591
11
LTC1591/LTC1597
Pin Functions
LTC1597
REF (Pin 1): Reference Input and 4-Quadrant Resistor R2.
Typically ±10V, accepts up to ± 25V. In 2-Quadrant mode
this is the reference input. In 4-quadrant mode, this pin is
driven by external inverting reference amplifier.
RCOM (Pin 2): Center Tap Point of the Two 4-Quadrant
Resistors R1 and R2. Normally tied to the inverting input
of an external amplifier in 4-quadrant operation, otherwise
shorted to the REF pin. See Figures 1b and 2b.
R1 (Pin 3): 4-Quadrant Resistor R1. In 2-quadrant operation short to the REF pin. In 4-quadrant mode tie to ROFS
(Pin 4).
IOUT1 (Pin 6): DAC Current Output. Tie to the inverting
input of the current to voltage converter op amp.
AGND (Pin 7): Analog Ground. Tie to ground.
LD (Pin 8): DAC Digital Input Load Control Input. When
LD is taken to a logic high, data is loaded from the input
register into the DAC register, updating the DAC output.
WR (Pin 9): DAC Digital Write Control Input. When WR is
taken to a logic low, data is loaded from the digital input
pins into the 16-bit wide input register.
DB15 to D4 (Pins 10 to 21): Digital Input Data Bits.
ROFS (Pin 4): Bipolar Offset Resistor. Typically swings
±10V, accepts up to ±25V. In 2-quadrant operation tie to
RFB. In 4-quadrant operation tie to R1.
DGND (Pin 22): Digital Ground. Tie to ground.
RFB (Pin 5): Feedback Resistor. Normally tied to the output
of the current to voltage converter op amp. Swings to
±VREF. VREF is typically ±10V.
DB3 to DB0 (Pins 24 to 27): Digital Input Data Bits.
12
VCC (Pin 23): The Positive Supply Input. 4.5V≤VCC ≥5.5V.
Requires a bypass capacitor to ground.
CLR (Pin 28): Digital Clear Control Function for the DAC.
When CLR is taken to a logic low, it sets the DAC output
and all internal registers to zero code for the LTC1597 and
mid-scale code for the LTC1597-1.
15917fb
For more information www.linear.com/LTC1591
LTC1591/LTC1597
Truth Table
Table 1
CONTROL INPUTS
CLR
WR
LD
REGISTER OPERATION
0
X
X
Reset Input and DAC Register to All 0s for LTC1591/LTC1597 and Mid-Scale for LTC1591-1/LTC1597-1 (Asynchronous
Operation)
1
0
0
Load Input Register with All 14/16 Data Bits
1
1
1
Load DAC Register with the Contents of the Input Register
1
0
1
1
Input and DAC Register Are Transparent
CLK = LD and WR Tied Together. The 14/16 Data Bits Are Loaded into the Input Register on the Falling Edge of the CLK and Then
Loaded into the DAC Register on the Rising Edge of the CLK
1
1
0
No Register Operation
Block Diagrams
LTC1591
REF
48k
1
12k
RCOM 2
48k
48k
48k
48k
48k
48k
48k
48k
96k
5 RFB
96k
96k
96k
12k
12k
4 ROFS
12k
R1 3
6 IOUT1
VCC 23
7 AGND
DECODER
LD 8
WR 9
LOAD
22 DGND
D12
D13
(MSB)
D10
D11
D9
• • •
DAC REGISTER
D0
(LSB)
INPUT REGISTER
WR
RST
28 CLR
RST
1591 BD
10
11
D13
D12
••••
21
24
25
26
27
D2
D1
D0
NC
NC
15917fb
For more information www.linear.com/LTC1591
13
LTC1591/LTC1597
BLOCK DIAGRAMS
LTC1597
REF
48k
1
12k
RCOM 2
48k
48k
48k
48k
48k
48k
48k
48k
96k
5 RFB
96k
96k
96k
12k
12k
4 ROFS
12k
R1 3
6 IOUT1
VCC 23
7 AGND
DECODER
LOAD
LD 8
WR 9
22 DGND
D14
D15
(MSB)
D12
D13
D11
• • •
DAC REGISTER
D0
(LSB) RST
INPUT REGISTER
WR
28 CLR
RST
1597 BD
10
11
D15
D14
••••
21
24
25
26
27
D4
D3
D2
D1
D0
Timing Diagram
tWR
WR
DATA
tDS
tDH
tLWD
LD
tLD
tCLR
CLR
1591/97TD
14
15917fb
For more information www.linear.com/LTC1591
LTC1591/LTC1597
Applications Information
Description
Digital Section
The LTC1591/LTC1597 are 14-/16-bit multiplying, current
output DACs with a full parallel 14-/16-bit digital interface.
The devices operate from a single 5V supply and provide
both unipolar 0V to – 10V or 0V to 10V and bipolar ±10V
output ranges from a 10V or –10V reference input. They
have three additional precision resistors on chip for bipolar
operation. Refer to the block diagrams regarding the following description.
The LTC1591/LTC1597 are 14-/16-bit wide full parallel
data bus inputs. The devices are double-buffered with two
14-/16-bit registers. The double-buffered feature permits
the update of several DACs simultaneously. The input
register is loaded directly from a 16-bit microprocessor
bus when the WR pin is brought to a logic low level. The
second register (DAC register) is updated with the data
from the input register when the LD pin is brought to a
logic high level. Updating the DAC register updates the
DAC output with the new data. To make both registers
transparent for flowthrough mode, tie WR low and LD
high. However, this defeats the deglitcher operation and
output glitch impulse may increase. The deglitcher is
activated on the rising edge of the LD pin. The versatility
of the interface also allows the use of the input and DAC
registers in a master slave or edge-triggered configuration.
This mode of operation occurs when WR and LD are tied
together. The asynchronous clear pin resets the LTC1591/
LTC1597 to zero scale and the LTC1591-1/LTC1597-1 to
mid-scale. CLR resets both the input and DAC registers.
These devices also have a power-on reset. Table 1 shows
the truth table for the LTC1591/LT1597.
The 14-/16-bit DACs consist of a precision R-2R ladder
for the 11/13LSBs. The 3MSBs are decoded into seven
segments of resistor value R. Each of these segments
and the R-2R ladder carries an equally weighted current
of one eighth of full scale. The feedback resistor RFB and
4-quadrant resistor ROFS have a value of R/4. 4-quadrant
resistors R1 and R2 have a magnitude of R/4. R1 and R2
together with an external op amp (see Figure 2) inverts
the reference input voltage and applies it to the 14-/16bit DAC input REF, in 4-quadrant operation. The REF pin
presents a constant input impedance of R/8 in unipolar
mode and R/12 in bipolar mode. The output impedance of
the current output pin IOUT1 varies with DAC input code.
The IOUT1 capacitance due to the NMOS current steering
switches also varies with input code from 70pF to 115pF.
An added feature of these devices, especially for waveform
generation, is a proprietary deglitcher that reduces glitch
energy to below 2nV-s over the DAC output voltage range.
Unipolar Mode
(2-Quadrant Multiplying, VOUT = 0V to – VREF)
The LTC1591/LTC1597 can be used with a single op amp
to provide 2-quadrant multiplying operation as shown in
Figure 1. With a fixed – 10V reference, the circuits shown
give a precision unipolar 0V to 10V output swing.
5V
0.1µF
VREF
2
3
R1
1
REF
RCOM
R1
23
VCC
5
RFB
ROFS
R2
14
DATA
INPUTS
4
ROFS
LTC1591
33pF
IOUT1
AGND
DGND
WR LD CLR
9
8
28
NC
26
Unipolar Binary Code Table
–
6
14-BIT DAC
10 TO 21,
24, 25
WR
LD
CLR
RFB
7
+
LT1001
VOUT =
0V TO
–VREF
22
NC
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
LSB
MSB
1111
1000
0000
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
0000
1111
0000
0000
0000
11
00
01
00
27
–VREF (16,383/16,384)
–VREF (8,192/16,384) = –VREF/2
–VREF (1/16,384)
0V
1591/97 F01a
Figure 1a. Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to – VREF
15917fb
For more information www.linear.com/LTC1591
15
LTC1591/LTC1597
Applications Information
5V
0.1µF
VREF
2
3
R1
RCOM
R1
R2
16
DATA
INPUTS
LTC1597
1
REF
23
VCC
4
5
ROFS
RFB
ROFS
RFB
33pF
IOUT1
6
16-BIT DAC
AGND
10 TO 21,
24 TO 27
DGND
Unipolar Binary Code Table
–
7
+
LT1001
VOUT =
0V TO
–VREF
22
9
8
ANALOG OUTPUT
VOUT
LSB
MSB
1111
1000
0000
0000
WR LD CLR
WR
LD
CLR
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
1111
0000
0000
0000
1111
0000
0000
0000
1111
0000
0001
0000
28
–VREF (65,535/65,536)
–VREF (32,768/65,536) = –VREF/2
–VREF (1/65,536)
0V
1591/97 F01b
Figure 1b. Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to – VREF
Bipolar Mode
(4-Quadrant Multiplying, VOUT = – VREF to VREF)
The LTC1591/LTC1597 contain on chip all the 4-quadrant
resistors necessary for bipolar operation. 4-quadrant
multiplying operation can be achieved with a minimum of
external components, a capacitor and a dual op amp, as
shown in Figure 2. With a fixed 10V reference, the circuit
shown gives a precision bipolar – 10V to 10V output swing.
Op Amp Selection
Because of the extremely high accuracy of the 14-/16-bit
LTC1591/LTC1597, thought should be given to op amp
selection in order to achieve the exceptional performance
of which the part is capable. Fortunately, the sensitivity of
INL and DNL to op amp offset has been greatly reduced
compared to previous generations of multiplying DACs.
Op amp offset will contribute mostly to output offset and
gain and will have minimal effect on INL and DNL. For
the LTC1597, a 500µV op amp offset will cause about
0.55LSB INL degradation and 0.15LSB DNL degradation
with a 10V full-scale range. The main effects of op amp
offset will be a degradation of zero-scale error equal to
the op amp offset, and a degradation of full-scale error
16
equal to twice the op amp offset. For the LTC1597, the
same 500µV op amp offset (2mV offset for LTC1591) will
cause a 3.3LSB zero-scale error and a 6.5LSB full-scale
error with a 10V full-scale range.
Op amp input bias current (IBIAS) contributes only a
zero-scale error equal to IBIAS(RFB/ROFS) = IBIAS(6k). For
a thorough discussion of 16-bit DAC settling time and op
amp selection, refer to Application Note 74, “Component
and Measurement Advances Ensure 16-Bit DAC Settling
Time.”
Reference Input and Grounding
For optimum performance the reference input of the
LTC1597 should be driven by a source impedance of less
than 1kΩ. However, these DACs have been designed to
minimize source impedance effects. An 8kΩ source impedance degrades both INL and DNL by 0.2LSB.
As with any high resolution converter, clean grounding is
important. A low impedance analog ground plane and star
grounding should be used. AGND must be tied to the star
ground with as low a resistance as possible.
15917fb
For more information www.linear.com/LTC1591
LTC1591/LTC1597
Applications Information
VREF
+
5V
0.1µF
1/2 LT1112
–
2
3
R1
1
REF
RCOM
R1
ROFS
R2
14
DATA
INPUTS
5
23 4
VCC ROFS
RFB
RFB
IOUT1
DGND
WR LD CLR
9
NC
28
8
1/2 LT1112
AGND
10 TO 21,
24, 25
WR
LD
CLR
–
6
14-BIT DAC
LTC1591-1
26
Bipolar Offset Binary Code Table
33pF
7
+
VOUT =
–VREF
TO VREF
22
NC
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
ANALOG OUTPUT
VOUT
LSB
MSB
1111
0000
0000
1111
0000
1111
1000
1000
0111
0000
1111
0000
0000
1111
0000
11
01
00
11
00
27
VREF (8,191/8,192)
VREF (1/8,192)
0V
–VREF (1/8,192)
–VREF
1591/97 F02a
Figure 2a. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
VREF
+
5V
0.1µF
1/2 LT1112
–
2
3
R1
1
REF
RCOM
R1
ROFS
R2
16
DATA
INPUTS
LTC1597-1
10 TO 21,
24 TO 27
5
23 4
VCC ROFS
RFB
RFB
16-BIT DAC
IOUT1
AGND
DGND
–
6
1/2 LT1112
7
+
22
WR LD CLR
WR
LD
CLR
9
8
Bipolar Offset Binary Code Table
33pF
VOUT =
–VREF
TO VREF
DIGITAL INPUT
BINARY NUMBER
IN DAC REGISTER
LSB
MSB
1111
1000
1000
0111
0000
ANALOG OUTPUT
VOUT
1111
0000
0000
1111
0000
28
1111
0000
0000
1111
0000
1111
0001
0000
1111
0000
VREF (32,767/32,768)
VREF (1/32,768)
0V
–VREF (1/32,768)
–VREF
1591/97 F02b
Figure 2b. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF
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For more information www.linear.com/LTC1591
17
LTC1591/LTC1597
Typical Applications
Noninverting Unipolar Operation (2-Quadrant Multiplication) VOUT = 0V to VREF
+
5V
0.1µF
1/2 LT1112
–
2
VREF
1
RCOM
3 R1
R1
R2
16
DATA
INPUTS
LTC1597
10 TO 21,
24 TO 27
18
5
23 4
VCC ROFS
ROFS
RFB
RFB
33pF
IOUT1
9
8
28
–
6
16-BIT DAC
AGND
DGND
WR LD CLR
WR
LD
CLR
REF
1/2 LT1112
7
+
VOUT =
0V TO VREF
22
1591/97 F06
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Typical Applications
16-Bit VOUT DAC Programmable Unipolar/Bipolar Configuration
16
15
14
LTC203AC
UNIPOLAR/
BIPOLAR
1
2
3
+
15V
–
2
LT1468
LT1236A-10
4
+
6
–
3
2
R1
RCOM
R1
5V
LT1001
R2
16
DATA
INPUTS
LTC1597
10 TO 21,
24 TO 27
0.1µF
1
23
REF VCC
4
5
ROFS
ROFS
RFB
RFB
IOUT1
16-BIT DAC
DGND
9
8
28
–
6
AGND
WR LD CLR
WR
LD
CLR
15pF
7
+
LT1468
VOUT
22
1591/97 F04
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For more information www.linear.com/LTC1591
19
LTC1591/LTC1597
Typical Applications
Digital Waveform Generator
15V
2
LT1236A-10
4
6
+
5V
LT1001
0.1µF
–
FREQUENCY CONTROL
SERIAL
OR BYTE
LOAD
REGISTER
n
PARALLEL
n
DELTA
PHASE
REGISTER
M
n = 24 TO 32 BITS
PHASE ACCUMULATOR
n
3
2
R1
RCOM
R1
∑
n
PHASE
REGISTER
n
SIN ROM
LOOKUP
TABLE
CLOCK
PHASE
TRUNCATION
16 BITS
R2
16
DATA
INPUTS
LTC1597
1
REF
5
23 4
VCC ROFS
ROFS
RFB
RFB
15pF
IOUT1
10 TO 21,
24 TO 27
AGND
DGND
WR LD CLR
9
8
–
6
16-BIT DAC
28
22
7
+
LT1468
LOWPASS
FILTER
fO =
(M)(fC)
2n
1591/97 F05
fO
20
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Package Description
Dimensions in inches (millimeters) unless otherwise noted.
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.397 – 0.407*
(10.07 – 10.33)
28 27 26 25 24 23 22 21 20 19 18 17 16 15
0.301 – 0.311
(7.65 – 7.90)
1 2 3 4 5 6 7 8 9 10 11 12 13 14
0.205 – 0.212**
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
0° – 8°
0.005 – 0.009
(0.13 – 0.22)
0.0256
(0.65)
BSC
0.022 – 0.037
(0.55 – 0.95)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.010 – 0.015
(0.25 – 0.38)
0.002 – 0.008
(0.05 – 0.21)
G28 SSOP 0694
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For more information www.linear.com/LTC1591
21
LTC1591/LTC1597
Package Description
Dimensions in inches (millimeters) unless otherwise noted.
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N Package
N Package
28-Lead Plastic PDIP
(Narrow 0.300 Inch)
28-Lead
(Narrow
Inch)
(LTCPlastic
DWG # PDIP
05-08-1510
Rev .300
I)
(Reference LTC DWG # 05-08-1510 Rev I)
1.400*
(35.560)
MAX
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
.240 – .295*
(6.096 – 7.493)
.300 – .325
(7.620 – 8.255)
.045 – .065
(1.143 – 1.651)
.130 ±.005
(3.302 ±0.127)
.020
(0.508)
MIN
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
+0.889
8.255
–0.381
)
.120
(3.048)
MIN
.065
(1.651)
TYP
N28 REV I 0711
.005
(0.127)
MIN
.100
(2.54)
BSC
.018 ±.003
(0.457 ±0.076)
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
OBSOLETE PACKAGE
22
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For more information www.linear.com/LTC1591
LTC1591/LTC1597
Revision History
(Revision history begins at Rev B)
REV
DATE
DESCRIPTION
B
07/15
Obsoleted 28-Lead PDIP Package
PAGE NUMBER
2, 3, 22
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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.
For more
information
www.linear.com/LTC1591
23
LTC1591/LTC1597
Typical Application
17-Bit Sign Magnitude DAC with Bipolar Zero Error of 140µV (0.92LSB at 17 Bits) at 25°C
16
15
14
LTC203AC
15V
2
1
LT1236A-10
4
2
3
6
+
–
5V
0.1µF
LT1468
15pF
SIGN
BIT
3
2
R1
RCOM
R1
1
REF
R2
16
DATA
INPUTS
LTC1597
5
23 4
VCC ROFS
RFB
ROFS
RFB
20pF
IOUT1
16-BIT DAC
AGND
10 TO 21,
24 TO 27
DGND
WR LD CLR
WR
LD
CLR
9
8
–
6
7
+
LT1468
VOUT
22
1591/97 F03
28
Related Parts
PART NUMBER
Op Amps
LT®1001
LT1112
LT1468
DACs
LTC1595/LTC1596
LTC1650
LTC1658
ADCs
LTC1418
LTC1604
LTC1605
References
LT1236
DESCRIPTION
COMMENTS
Precision Operational Amplifier
Dual Low Power, Precision Picoamp Input Op Amp
90MHz, 22V/µs, 16-Bit Accurate Op Amp
Low Offset, Low Drift
Low Offset, Low Drift
Precise, 1µs Settling to 0.0015%
Serial 16-Bit Current Output DACs
Serial 16-Bit Voltage Output DAC
Serial 14-Bit Voltage Output DAC
Low Glitch, ±1LSB Maximum INL, DNL
Low Noise and Glitch Rail-to-Rail VOUT
Low Power, 8-Lead MSOP Rail-to-Rail VOUT
14-Bit, 200ksps 5V Sampling ADC
16-Bit, 333ksps Sampling ADC
Single 5V, 16-Bit 100ksps ADC
16mW Dissipation, Serial and Parallel Outputs
±2.5V Input, SINAD = 90dB, THD = 100dB
Low Power, ±10V Inputs
Precision Reference
Ultralow Drift, 5ppm/°C, High Accuracy 0.05%
24 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
For more information www.linear.com/LTC1591
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
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LT 0715 REV B • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
工商网监
湘ICP备2023018690号
